GFE - Components - Sensors and Detectors (291002)
ANSWER: C.
TOPIC: 291002 KNOWLEDGE: K1.09 [3.3/3.3] QID: B165 Reactor feedwater flow and vessel level detectors use differential pressure (D/P) cells to measure flow and level. If a level D/P cell diaphragm fails, the level indication... A. will go to 0. B. will slowly move to 50 percent (midrange). C. will indicate 100 percent (full range). D. remains the same.
ANSWER: B.
TOPIC: 291002 KNOWLEDGE: K1.15 [2.6/2.8] QID: B1710 (P1710) Refer to the drawing of a simple thermocouple circuit (see figure below). A thermocouple temperature indication is initially 150°F. A small steam leak raises both the measuring (hot) junction and reference (cold) junction temperatures by 20°F. Without temperature compensation for the reference junction, the new temperature indication will be... A. 130°F. B. 150°F. C. 170°F. D. 190°F.
ANSWER: A.
TOPIC: 291002 KNOWLEDGE: K1.16 [2.5/2.7] QID: B812 (P813) What type of sensor is most commonly used to provide remote position indication of a valve that is normally either fully open or fully closed? A. Limit switch B. Reed switch C. Servo transmitter D. Linear variable differential transformer
ANSWER: A.
TOPIC: 291002 KNOWLEDGE: K1.01 [2.4/2.5] QID: B159 Which one of the following is a characteristic of a venturi flow device? A. Develops an output signal by measuring the differential pressure of the fluid as it passes through the device. B. Can measure the rate of flow of incompressible fluids, but not of compressible fluids. C. Develops an output signal by measuring the velocity of the fluid as it passes through the device. D. Produces a head loss that is greater than the head loss produced by an orifice.
ANSWER: D.
TOPIC: 291002 KNOWLEDGE: K1.01 [2.4/2.5] QID: B2010 (P3306) A cooling water system is operating at steady state conditions. A calibrated system flow meter indicates 600 gpm with 50 psid across the flow element. If cooling water flow rate increases to 900 gpm, the differential pressure sensed by the flow element will be approximately... A. 63 psid. B. 75 psid. C. 97 psid. D. 112 psid.
ANSWER: D.
TOPIC: 291002 KNOWLEDGE: K1.01 [2.4/2.5] QID: B2106 (P908) Which one of the following flow measuring elements produces the largest unrecoverable head loss when used in an operating fluid system? A. Venturi B. Flow nozzle C. Pipe elbow D. Orifice
ANSWER: C.
TOPIC: 291002 KNOWLEDGE: K1.01 [2.4/2.5] QID: B2206 (P2406) A cooling water system is operating at a steady state flow rate of 700 gpm with 60 psid across the associated venturi flow element. If cooling water flow rate increases to 900 gpm, the differential pressure sensed by the venturi flow element will be approximately... A. 68 psid. B. 77 psid. C. 99 psid. D. 127 psid.
ANSWER: A.
TOPIC: 291002 KNOWLEDGE: K1.01 [2.4/2.5] QID: B2306 (P2306) A venturi is being used to measure the flow rate in a cooling water system. As the water flows from the throat to the discharge of the venturi, water pressure will __________; and volumetric flow rate will __________. (Assume water is incompressible.) A. increase; remain the same B. increase; increase C. decrease; remain the same D. decrease; decrease
ANSWER: D.
TOPIC: 291002 KNOWLEDGE: K1.01 [2.4/2.5] QID: B305 (P308) A cooling water system is operating at steady state conditions indicating 900 gpm with 60 psid across the flow transmitter venturi. If cooling water flow rate is increased to 1,800 gpm, differential pressure across the flow transmitter venturi will be approximately... A. 85 psid. B. 120 psid. C. 175 psid. D. 240 psid.
ANSWER: B.
TOPIC: 291002 KNOWLEDGE: K1.01 [2.4/2.5] QID: B3306 (P1106) Refer to the drawing of a venturi flow element in an operating cooling water system (see figure below). At what point does the lowest pressure exist? A. Point A B. Point B C. Point C D. Point D
ANSWER: C.
TOPIC: 291002 KNOWLEDGE: K1.01 [2.4/2.5] QID: B3706 (P3706) The following is the current calibration data for an orifice plate that is being used for water flow rate measurement: Upstream Pressure = 135 psig Downstream Pressure = 120 psig Flow Rate = 100 gpm During a surveillance, the following pressures are observed across the orifice plate: Upstream Pressure = 124 psig Downstream Pressure = 117 psig What is the approximate water flow rate through the orifice plate? A. 47 gpm B. 57 gpm C. 68 gpm D. 78 gpm
ANSWER: C.
TOPIC: 291002 KNOWLEDGE: K1.01 [2.4/2.5] QID: B407 (P1606) Refer to the drawing in which water is flowing through a convergent-divergent venturi (see figure below). The pipe diameters at P1 and P2 are equal. Compared to the conditions at the inlet of the venturi (P1), the pressure at the outlet of the venturi (P2) has __________; and water velocity at the outlet of the venturi has __________. (Assume "real" conditions.) A. remained the same; remained the same B. remained the same; decreased slightly C. decreased slightly; remained the same D. decreased slightly; decreased slightly
ANSWER: B.
TOPIC: 291002 KNOWLEDGE: K1.01 [2.4/2.5] QID: B706 (P707) A cooling water system is operating at a steady state flow rate of 700 gpm with 60 psid across the flow transmitter venturi. If cooling water flow rate is increased to 1,000 gpm, differential pressure across the flow transmitter venturi will be... A. 85.7 psid. B. 122.4 psid. C. 171.4 psid. D. 244.8 psid.
ANSWER: C.
TOPIC: 291002 KNOWLEDGE: K1.01 [2.4/2.5] QID: B7632 (P7632) Refer to the drawing of a frictionless venturi flow element (see figure below). Subcooled water is flowing through the venturi with the following initial conditions: Flow rate = 500 gpm Tap A pressure = 40 psia Tap B pressure = 36 psia When flow rate is increased to 750 gpm, the pressure at tap A increases to 68 psia. What is the new pressure at tap B? A. 66 psia B. 62 psia C. 59 psia D. 52 psia
ANSWER: B.
TOPIC: 291002 KNOWLEDGE: K1.01 [2.4/2.5] QID: B7681 (P7681) Refer to the drawing of a frictionless venturi flow element (see figure below). Subcooled water is flowing through the venturi with the following initial conditions: Flow rate = 500 gpm Tap A pressure = 48 psia Tap B pressure = 44 psia When flow rate is increased to 900 gpm, the pressure at tap A increases to 62 psia. What is the new pressure at tap B? A. 46 psia B. 49 psia C. 55 psia D. 60 psia
ANSWER: A.
TOPIC: 291002 KNOWLEDGE: K1.01 [2.4/2.5] QID: B807 (P807) Refer to the drawing of a venturi flow element (see figure below) with direction of water flow indicated by the arrow. Where should the high pressure tap of a differential pressure flow detector be connected? A. Point A B. Point B C. Point C D. Point D
ANSWER: D.
TOPIC: 291002 KNOWLEDGE: K1.01 [2.4/2.5] QID: B9 What happens to the pressure and velocity of water as it passes through a venturi? A. Pressure remains constant, but the velocity increases as the diameter of the venturi decreases. B. Pressure increases, but the velocity decreases as the diameter of the venturi decreases. C. Pressure decreases, but the velocity remains constant as the diameter of the venturi increases. D. Pressure increases, but the velocity decreases as the diameter of the venturi increases.
ANSWER: A.
TOPIC: 291002 KNOWLEDGE: K1.01 [2.4/2.5] QID: B907 (P1308) Refer to the drawing of a venturi flow element in an operating cooling water system (see figure below). A differential pressure detector measuring flow rate through the venturi will produce the highest flow rate indication if its high-pressure tap is connected at point _____; and its low-pressure tap is connected at point _____. A. A; B B. A; D C. B; C D. B; D
ANSWER: A.
TOPIC: 291002 KNOWLEDGE: K1.02 [2.4/2.5] QID: B10 The change in pressure across a main steam line flow element is... A. directly proportional to the volumetric flow rate. B. inversely proportional to the volumetric flow rate. C. directly proportional to the mass flow rate. D. inversely proportional to the mass flow rate.
ANSWER: C.
TOPIC: 291002 KNOWLEDGE: K1.02 [2.4/2.5] QID: B1606 (P406) The density compensating input to a steam flow instrument is used to convert volumetric flow rate into... A. velocity flow rate. B. gallons per minute. C. mass flow rate. D. differential flow rate.
ANSWER: B.
TOPIC: 291002 KNOWLEDGE: K1.02 [2.4/2.5] QID: B1806 (P6) Density input is normally used in steam flow instruments to convert __________ into __________. A. mass flow rate; volumetric flow rate B. volumetric flow rate; mass flow rate C. mass flow rate; differential pressure D. differential pressure; volumetric flow rate
ANSWER: A.
TOPIC: 291002 KNOWLEDGE: K1.02 [2.4/2.5] QID: B906 If the density input to a density-compensated steam flow instrument rapidly fails high, the indicated flow will... A. increase and stabilize at a new higher value. B. increase temporarily, then return to its initial value. C. decrease and stabilize at a new lower value. D. decrease temporarily, then return to its initial value.
ANSWER: D.
TOPIC: 291002 KNOWLEDGE: K1.02 [2.4/2.6] QID: B2906 (P305) If the steam pressure input to a density compensated steam flow instrument fails high, the associated flow rate indication will... A. decrease, because the density input has decreased. B. increase, because the density input has decreased. C. decrease, because the density input has increased. D. increase, because the density input has increased.
ANSWER: C.
TOPIC: 291002 KNOWLEDGE: K1.04 [2.9/3.1] QID: B1006 Which one of the following will cause indicated liquid flow rate to be higher than actual flow rate when using a differential pressure (D/P) flow detector with a calibrated orifice? A. System pressure decreases. B. The detector diaphragm ruptures. C. Debris becomes lodged in the orifice. D. The pressure surrounding the D/P detector housing decreases.
ANSWER: D.
TOPIC: 291002 KNOWLEDGE: K1.04 [2.9/3.1] QID: B1506 (P1205) If the orifice in a differential pressure (D/P) flow sensor erodes such that the orifice opening becomes larger, indicated flow rate will __________ due to a __________ D/P across the orifice. (Assume actual flow rate remains the same.) A. increase; larger B. increase; smaller C. decrease; larger D. decrease; smaller
ANSWER: D.
TOPIC: 291002 KNOWLEDGE: K1.04 [2.9/3.1] QID: B1607 A flow instrument for an operating cooling water system was calibrated with the differential pressure flow detector equalizing valve slightly open. If the valve is subsequently closed, flow indication will... A. decrease and stabilize above 0 gpm. B. decrease and stabilize at 0 gpm. C. increase and stabilize at the actual flow rate. D. increase and stabilize above the actual flow rate.
ANSWER: A.
TOPIC: 291002 KNOWLEDGE: K1.04 [2.9/3.1] QID: B211 A differential pressure (D/P) cell is being used to measure flow rate in a cooling water system. Flow rate is indicating 75 percent of scale. If the D/P cell diaphragm ruptures, indicated flow rate will... A. decrease, because low D/P is sensed. B. decrease, because high D/P is sensed. C. increase, because low D/P is sensed. D. increase, because high D/P is sensed.
ANSWER: B.
TOPIC: 291002 KNOWLEDGE: K1.04 [2.9/3.1] QID: B2310 (P2305) An orifice is being used in an operating cooling water system to measure flow rate. Which one of the following will cause the differential pressure sensed across the orifice to decrease? A. System pressure decreases. B. System flow rate decreases. C. Debris becomes lodged in the orifice. D. A leak develops in the low pressure sensing line.
ANSWER: B.
TOPIC: 291002 KNOWLEDGE: K1.04 [2.9/3.1] QID: B307 (P307) A differential pressure flow detector is connected to a calibrated orifice in a cooling water system. Which one of the following will cause indicated volumetric flow rate to be lower than actual volumetric flow rate? A. System pressure decreases. B. The orifice erodes over time. C. Debris becomes lodged in the orifice. D. A leak develops in the low pressure sensing line.
ANSWER: C.
TOPIC: 291002 KNOWLEDGE: K1.04 [2.9/3.1] QID: B707 (P706) Flow rate is being measured using a differential pressure flow detector and a calibrated orifice. If actual flow rate remains constant, which one of the following will cause indicated flow rate to be higher than actual flow rate? A. The flow detector equalizing valve is inadvertently opened. B. A leak develops in the high pressure sensing line. C. Debris becomes lodged in the orifice. D. The orifice erodes over time.
ANSWER: A.
TOPIC: 291002 KNOWLEDGE: K1.04 [2.9/3.1] QID: B8 A leak develops in the high pressure side of a flow detector. What effect does the leak have on the affected flow indication? A. The measured ΔP will decrease, causing indicated flow to decrease. B. The measured ΔP will decrease, causing indicated flow to increase. C. The measured ΔP will increase, causing indicated flow to decrease. D. The measured ΔP will increase, causing indicated flow to increase.
ANSWER: C.
TOPIC: 291002 KNOWLEDGE: K1.05 [3.1/3.1] QID: B1007 (P2807) Refer to the drawing of a pipe elbow (top view) in an operating water system (see figure below). At which one of the following locations is the highest pressure sensed? (Assume a constant pipe diameter and zero head loss in this section of pipe.) A. Point A B. Point B C. Point C D. Point D
ANSWER: C.
TOPIC: 291002 KNOWLEDGE: K1.05 [3.1/3.1] QID: B1108 If the flow rate through a differential pressure (D/P) detector flow nozzle doubles, by what factor would the D/P increase? A. √("2" ) B. 2 C. 4 D. 8
ANSWER: D.
TOPIC: 291002 KNOWLEDGE: K1.05 [3.1/3.1] QID: B1307 Flow rate in a cooling water system, measured using a differential pressure (D/P) detector, indicates 100 gpm at a D/P of 30 psid. If indicated flow rate increases to 150 gpm, what D/P is being sensed by the detector? A. 36.7 psid B. 37.5 psid C. 66.7 psid D. 67.5 psid
ANSWER: B.
TOPIC: 291002 KNOWLEDGE: K1.05 [3.1/3.1] QID: B1408 (P1906) Refer to the drawing of a pipe elbow (top view) in an operating water system (see figure below). At which one of the following pairs of connection points will the greatest differential pressure be sensed? (Assume a constant pipe diameter and zero head loss in this section of pipe.) A. Points A and B B. Points B and C C. Points C and D D. Points D and A
ANSWER: A.
TOPIC: 291002 KNOWLEDGE: K1.05 [3.1/3.1] QID: B1608 (P1608) Refer to the drawing of a horizontal pipe elbow (top view) in an operating water system (see figure below). Three separate differential pressure flow detectors are connected to taps A, B, C, and D as follows: Detector Taps X A and D Y B and D Z C and D Assuming zero head loss in this section of pipe, how will the detectors be affected if tap D ruptures? A. All detectors will fail low. B. All detectors will fail high. C. Two detectors will fail low and one will fail high. D. Two detectors will fail high and one will fail low.
ANSWER: B.
TOPIC: 291002 KNOWLEDGE: K1.05 [3.1/3.1] QID: B1773 (P1873) Water is flowing through each of the following devices. Which one of the devices will produce an outlet pressure that is greater than the inlet pressure? A. Convergent nozzle B. Divergent nozzle C. Orifice D. Flow restrictor
ANSWER: D.
TOPIC: 291002 KNOWLEDGE: K1.05 [3.1/3.1] QID: B708 (P705) A steam flow measuring instrument uses density compensation and square root compensation to convert the differential pressure across a flow element to flow rate in lbm/hr. The purpose of square root compensation in this flow measuring instrument is to convert __________ into __________. A. volumetric flow rate; mass flow rate B. volumetric flow rate; differential pressure C. differential pressure; mass flow rate D. differential pressure; volumetric flow rate
ANSWER: B.
TOPIC: 291002 KNOWLEDGE: K1.05 [3.1/3.1] QID: B908 Refer to the drawing of a pipe elbow (top view) in an operating water system (see figure below). At which one of the following locations is the lowest pressure sensed? (Assume a constant pipe diameter and zero head loss in this section of pipe.) A. Point A B. Point B C. Point C D. Point D
ANSWER: D.
TOPIC: 291002 KNOWLEDGE: K1.06 [2.8/2.9] QID: B11 Refer to the drawing of a reactor vessel (RV) differential pressure (D/P) level detection system (see figure below). What is the reason for the reference leg being connected to the RV instead of being connected to a water source independent of the RV? A. To provide a vent path to prevent collapse of the reference leg during a rapid RV depressurization B. To remove the need for density compensation of the level signal by keeping the reference leg at the same temperature as the variable leg C. To make the indicated level proportional to the square root of the D/P pressure between the reference and variable legs for all reactor pressures D. To provide compensation for the RV pressure exerted on the variable leg
ANSWER: D.
TOPIC: 291002 KNOWLEDGE: K1.06 [2.8/2.9] QID: B1209 Two differential pressure level transmitters are installed on a large water storage tank. Transmitter I was calibrated at 100°F and transmitter II was calibrated at 200°F water temperature. Which transmitter will indicate a higher level? A. Transmitter I below 150°F, transmitter II above 150°F. B. Transmitter II below 150°F, transmitter I above 150°F. C. Transmitter I at all water temperatures. D. Transmitter II at all water temperatures.
ANSWER: A.
TOPIC: 291002 KNOWLEDGE: K1.06 [2.8/2.9] QID: B1409 (P1607) Refer to the drawing of a water storage tank with a differential pressure (D/P) level detector (see figure below). The associated level instrument was calibrated with the water storage tank at 120°F. If the mass in the tank remains constant and the water temperature decreases to 100°F, the indicated level will... A. remain the same although actual level decreases. B. remain the same although actual level increases. C. increase in direct proportion to the temperature decrease. D. decrease in direct proportion to the temperature decrease.
ANSWER: B.
TOPIC: 291002 KNOWLEDGE: K1.06 [2.8/2.9] QID: B1706 (P1706) Refer to the drawing of a water storage tank with two differential pressure (D/P) level indicators (see figure below). Two D/P level indicators are installed on a large water storage tank. Indicator No. 1 was calibrated at 200°F water temperature and indicator No. 2 was calibrated at 100°F water temperature. Assuming both indicators are on scale, which indicator will indicate the lower level? A. Indicator 1 at all water temperatures. B. Indicator 2 at all water temperatures. C. Indicator 1 below 150°F, indicator 2 above 150°F. D. Indicator 2 below 150°F, indicator 1 above 150°F.
ANSWER: C.
TOPIC: 291002 KNOWLEDGE: K1.06 [2.8/2.9] QID: B1809 Refer to the drawing of a water storage tank with a differential pressure (D/P) level detector that was recently calibrated at a tank water temperature of 80°F (see figure below). If the mass of the water in the tank remains the same while the tank water temperature is raised from 80°F to 150°F, the indicated level will... A. remain equal to actual level. B. increase, due to the expansion of the water. C. remain the same. D. decrease, due to the expansion of the water.
ANSWER: D.
TOPIC: 291002 KNOWLEDGE: K1.06 [2.8/2.9] QID: B209 Refer to the drawing of a water storage tank with a differential pressure (D/P) level detector (see figure below). The level detector is being used in a level control system that was calibrated to maintain tank level at 80 percent at the current water temperature of 100°F. If the water temperature gradually decreases and stabilizes at 70°F, the level control system will cause actual tank level to... A. remain at 80 percent. B. increase and stabilize above 80 percent. C. oscillate around 80 percent. D. decrease and stabilize below 80 percent.
ANSWER: B.
TOPIC: 291002 KNOWLEDGE: K1.06 [2.8/2.9] QID: B2210 Refer to the drawing of a water storage tank with a differential pressure (D/P) level detector (see figure below). The level detector is being used in a level control system that was calibrated to maintain tank level at 80 percent at the current water temperature of 70°F. If the water temperature gradually increases and stabilizes at 90°F, the level control system will cause actual tank level to... A. remain at 80 percent. B. increase and stabilize above 80 percent. C. oscillate around 80 percent. D. decrease and stabilize below 80 percent.
ANSWER: A.
TOPIC: 291002 KNOWLEDGE: K1.06 [2.8/2.9] QID: B2408 (P2108) Refer to the drawing of a water storage tank with two differential pressure (D/P) level indicators (see figure below). Indicator 1 was calibrated at 180°F and indicator 2 was calibrated at 120°F. If tank water temperature is 150°F, then indicator... A. 1 will read greater than indicator 2, and greater than actual water level. B. 1 will read greater than indicator 2, and less than actual water level. C. 2 will read greater than indicator 1, and greater than actual water level. D. 2 will read greater than indicator 1, and less than actual water level.
ANSWER: B.
TOPIC: 291002 KNOWLEDGE: K1.06 [2.8/2.9] QID: B709 Refer to the drawing of a water storage tank with two differential pressure (D/P) level indicators (see figure below). Indicator 1 was calibrated at 120°F and indicator 2 was calibrated at 180°F. If tank water temperature is 150°F, then indicator... A. 1 will read greater than indicator 2. B. 2 will read greater than indicator 1. C. 1 and 2 readings will increase by the same amount. D. 1 and 2 readings will decrease by the same amount.
ANSWER: B.
TOPIC: 291002 KNOWLEDGE: K1.06 [2.8/2.9] QID: B809 (P808) Refer to the drawing of a water storage tank with a differential pressure (D/P) level detection system (see figure below). The level detector is being used in a level control system that was calibrated to maintain tank level at 80 percent when the tank water temperature was 100°F. If tank water temperature gradually increases and stabilizes at 150°F, the level control system will cause actual tank level to... A. remain stable at 80 percent. B. increase and stabilize above 80 percent. C. oscillate and then stabilize at 80 percent. D. decrease and stabilize below 80 percent.
ANSWER: A.
TOPIC: 291002 KNOWLEDGE: K1.06 [2.8/2.9] QID: B909 (P208) Refer to the drawing of a water storage tank with a differential pressure (D/P) level detector (see figure below). The associated level instrument was calibrated with the water storage tank at 100°F. If mass in the tank remains constant and the water temperature increases to 120°F, the indicated level will... A. remain the same although actual level increases. B. increase but remain less than actual level. C. decrease in direct proportion to the temperature rise. D. increase in direct proportion to the temperature rise.
ANSWER: D.
TOPIC: 291002 KNOWLEDGE: K1.07 [3.2/3.2] QID: B1211 (P1807) A cooling water system is cooling a lube oil heat exchanger. Cooling water system surge tank level is being measured using a differential pressure level detector that has been calibrated at the current water temperature in the tank. A leak in the heat exchanger results in lube oil collecting in the surge tank. Assuming that the temperature of the contents in the surge tank does not change, indicated tank level will be __________ than actual tank level because lube oil is __________ than water. A. higher; more dense B. higher; less dense C. lower; more dense D. lower; less dense
ANSWER: A.
TOPIC: 291002 KNOWLEDGE: K1.07 [3.2/3.2] QID: B1507 (P1107) Refer to the drawing of a water storage tank with two tank differential pressure (D/P) level indicators (see figure below). Two D/P level indicators are installed on a large water storage tank. Indicator 1 was calibrated at 100°F water temperature and indicator 2 was calibrated at 200°F water temperature. Assuming both indicators are on scale, which indicator will indicate the lower level? A. Indicator 1 at all water temperatures B. Indicator 2 at all water temperatures C. Indicator 1 below 150°F, indicator 2 above 150°F D. Indicator 2 below 150°F, indicator 1 above 150°F
ANSWER: A.
TOPIC: 291002 KNOWLEDGE: K1.07 [3.2/3.2] QID: B155 Many reactor vessel water level instruments are designed with a condensing chamber in the reference leg. The purpose of the condensing chamber is to... A. provide a source of makeup water to the reference leg during normal operations. B. provide reference leg compensation for the reactor pressure exerted on the variable leg. C. prevent reference leg flashing during a rapid depressurization of the reactor vessel. D. ensure the reference leg temperature remains near the temperature of the water in the reactor vessel.
ANSWER: A.
TOPIC: 291002 KNOWLEDGE: K1.07 [3.2/3.2] QID: B3010 (P3008) Refer to the drawing of a water storage tank with a differential pressure (D/P) level detection system (see figure below). Assume the initial temperature of the reference leg and the water in the tank is 100°F, and that reference leg temperature does not change. If the temperature of the water in the tank increases by 20°F, the D/P sensed by the detector will __________ as long as the water __________ is maintained constant. A. increase; level B. decrease; level C. increase; mass D. decrease; mass
ANSWER: B.
TOPIC: 291002 KNOWLEDGE: K1.07 [3.2/3.2] QID: B6105 (P6104) Refer to the drawing of a water storage tank with a differential pressure (D/P) level detection system (see figure below). The D/P level detector was just calibrated and returned to operation with the following conditions: The reference leg contains 20 feet of water at 70°F. The tank contains 18 feet of water at 70°F. Tank level indication is 18 feet. Assume the actual tank water level and the temperature of the water in the tank and reference leg do not change. Which one of the following will be the new tank level indication if the reference leg water level decreases to 18 feet? A. 22 feet B. 20 feet C. 18 feet D. 2 feet
ANSWER: B.
TOPIC: 291002 KNOWLEDGE: K1.07 [3.2/3.2] QID: B6606 (P6604) Refer to the drawing of a water storage tank with a differential pressure (D/P) level detection system (see figure below). The water storage tank is 40 feet tall. The level detection system is calibrated to provide a level indication of 30 feet when the tank and reference leg levels are equal. If the tank is completely filled with water, the tank level will indicate... A. less than 30 feet. B. 30 feet. C. greater than 30 feet, but less than 40 feet. D. 40 feet.
ANSWER: C.
TOPIC: 291002 KNOWLEDGE: K1.07 [3.2/3.2] QID: B7404 (P7404) Refer to the drawing of a vented water storage tank with a differential pressure (D/P) level detection system (see figure below). The water in the tank and reference leg is at the same temperature. The tank level indicator was just calibrated to indicate 0 percent when the tank is empty and 100 percent when the water level reaches the upper tap. The indicator's display range is 0 percent to 120 percent. The initial water level is as indicated in the figure. If the tank water level slowly increases and stabilizes just below the top of the tank, the level indication will increase until... A. the water level stabilizes, at which time the level indication will stabilize at 100 percent. B. the water level stabilizes, at which time the level indication will stabilize at a value greater than 100 percent. C. the water level reaches the upper tap, at which time the level indication will remain at 100 percent as the water level continues to increase. D. the water level reaches the upper tap, at which time the level indication will continue to increase as the water level continues to increase.
ANSWER: A.
TOPIC: 291002 KNOWLEDGE: K1.07 [3.2/3.2] QID: B910 (P910) Refer to the drawing of a water storage tank with a differential pressure (D/P) level detection system (see figure below). The D/P sensed by the detector varies in the __________ direction as the temperature of the water in the tank if the __________ of the tank water is constant. (Assume reference leg and tank water temperatures are initially the same.) A. same; level B. inverse; level C. same; mass D. inverse; mass
ANSWER: A.
TOPIC: 291002 KNOWLEDGE: K1.09 [3.3/3.3] QID: B1010 (P209) Refer to the drawing of a reactor vessel differential pressure (D/P) level detection system (see figure below). The D/P detector was calibrated at the current conditions. Which one of the following will cause the level instrument to indicate lower than actual level? (Assume actual level remains the same.) A. The variable leg ruptures. B. The equalizing valve is opened. C. The reference leg temperature increases. D. The D/P detector diaphragm ruptures.
ANSWER: C.
TOPIC: 291002 KNOWLEDGE: K1.09 [3.3/3.3] QID: B1212 (P2408) Refer to the drawing of a reactor vessel (RV) differential pressure (D/P) level detection system (see figure below). Which one of the following events will result in a reactor vessel level indication that is greater than actual level? A. The RV pressure increases by 50 psia. B. The variable leg breaks and completely drains. C. A portion of the reference leg water flashes to steam. D. The temperature surrounding the RV and reference leg decreases by 30°F.
ANSWER: D.
TOPIC: 291002 KNOWLEDGE: K1.09 [3.3/3.3] QID: B1308 Refer to the drawing of a reactor vessel differential pressure (D/P) level detection system (see figure below). Which one of the following will result in the lowest reactor vessel level indication? A. The reactor pressure increases by 100 psig. B. The D/P cell equalizing valve leaks by. C. The reference leg flashes to steam. D. The temperature of the reference leg decreases by 20°F.
ANSWER: D.
TOPIC: 291002 KNOWLEDGE: K1.09 [3.3/3.3] QID: B1410 Refer to the drawing of a reactor vessel differential pressure (D/P) level detection system (see figure below). Which one of the following events will result in a reactor vessel level indication that is greater than actual level? A. The external pressure surrounding the D/P detector decreases by 2 psi. B. Reactor vessel pressure increases by 10 psi with no change in actual water level. C. Actual vessel level increases by 6 inches. D. The temperature of the reference leg increases by 20°F.
ANSWER: A.
TOPIC: 291002 KNOWLEDGE: K1.09 [3.3/3.3] QID: B207 Refer to the drawing of a water storage tank with a differential pressure (D/P) level detection system (see figure below). Which one of the following failures will cause the lowest stable water level indication? (Assume no operator action and no tank makeup.) A. The tank level sensing line ruptures at the detector. B. The reference leg ruptures at the detector. C. The gas or vapor space ruptures. D. The D/P cell diaphragm ruptures.
ANSWER: B.
TOPIC: 291002 KNOWLEDGE: K1.09 [3.3/3.3] QID: B2308 (P2308) Refer to the drawing of a reactor vessel differential pressure (D/P) level detection system that was calibrated at normal operating conditions (see figure below). A reactor vessel cooldown has resulted in a decrease in reactor vessel pressure from 900 psia to 400 psia in one hour. Without density compensation of the level instrumentation, at the end of the cooldown reactor vessel level indication would indicate __________ than actual level because the density of the water in the __________ has changed significantly. A. higher; reference leg B. higher; reactor vessel C. lower; reference leg D. lower; reactor vessel
ANSWER: A.
TOPIC: 291002 KNOWLEDGE: K1.09 [3.3/3.3] QID: B2709 Refer to the drawing of a reactor vessel (RV) differential pressure (D/P) level detection system (see figure below). The reactor vessel is supplying steam at normal operating temperature and pressure, and the level instrumentation has just been calibrated. Which one of the following events will result in a vessel level indication that is lower than actual level? A. RV saturation pressure increases by 50 psi. B. Actual RV water level decreases by 6 inches. C. The external pressure surrounding the D/P detector decreases by 2 psi. D. The external temperature surrounding the reference leg increases by 20°F.
ANSWER: C.
TOPIC: 291002 KNOWLEDGE: K1.10 [2.4/2.5] QID: B1011 (P1508) A bourdon tube works on the principle that when the pressure inside the tube decreases, the tube tends to: (Assume detected pressure remains above atmospheric pressure.) A. coil, due to an increased pressure-induced force on the outside of the tube. B. straighten, due to an increased pressure-induced force on the outside of the tube. C. coil, due to the spring action of the metal overcoming the pressure-induced force on the inside of the tube. D. straighten, due to the spring action of the metal overcoming the pressure-induced force on the inside of the tube.
ANSWER: D.
TOPIC: 291002 KNOWLEDGE: K1.10 [2.4/2.5] QID: B2109 (P2109) A centrifugal pump is taking suction from the bottom of a vented cylindrical storage tank that contains 100,000 gallons of water at 60°F. A pressure gauge at the inlet to the pump indicates 40 psig. Over the next several days, storage tank temperature increases to 90°F with no change in tank water level and no change in head loss in the pump suction line. Which one of the following is the current pressure at the inlet to the pump? A. 31.2 psig B. 34.6 psig C. 37.4 psig D. 39.8 psig
ANSWER: D.
TOPIC: 291002 KNOWLEDGE: K1.13 [2.9/3.1] QID: B212 (P211) A bourdon tube pressure detector was indicating 50 percent of scale when it was suddenly exposed to a high pressure transient that caused permanent strain to the bourdon tube. The detector remained intact and actual pressure was restored to its original value. During the pressure transient, the affected pressure indication initially went off scale high. After the original pressure was restored, the indication was... A. unpredictable. B. less than 50 percent of scale. C. 50 percent of scale. D. greater than 50 percent of scale.
ANSWER: B.
TOPIC: 291002 KNOWLEDGE: K1.14 [2.3/2.4] QID: B14 Which one of the following describes a characteristic of a thermocouple? A. A junction between two dissimilar metals will exhibit a change in electrical resistance proportional to temperature. B. A junction between two dissimilar metals will generate a voltage proportional to temperature. C. Thermocouples are generally more accurate than resistance temperature detectors. D. Indication will fail high off scale with an open circuit.
ANSWER: C.
TOPIC: 291002 KNOWLEDGE: K1.14 [2.3/2.4] QID: B1510 (P2212) Refer to the drawing of a simple thermocouple circuit (see figure below). Circuit temperature indication is initially 350°F. The reference (cold) junction temperature decreases by 10°F, while the measuring junction temperature remains constant. Without temperature compensation for the reference junction, the new temperature indication will be... A. 340°F. B. 350°F. C. 360°F. D. 370°F.
ANSWER: B.
TOPIC: 291002 KNOWLEDGE: K1.14 [2.3/2.4] QID: B2412 (P2409) What is the purpose of the reference junction panel that is provided with many thermocouple circuits? A. Ensures that thermocouple output is amplified sufficiently for use by temperature indication devices. B. Ensures that temperature changes away from the thermocouple measuring junction do not affect thermocouple temperature indication. C. Ensures that electrical noise in the thermocouple extension wires does not affect thermocouple temperature indication. D. Ensures that different lengths of thermocouple extension wires do not affect thermocouple temperature indication.
ANSWER: B.
TOPIC: 291002 KNOWLEDGE: K1.14 [2.3/2.4] QID: B2712 (P2711) Unlike a resistance temperature detector, a typical thermocouple... A. uses a single type of metal in the sensing element B. requires a temperature-controlled reference junction. C. can provide temperature input to a valve controller in a cooling water system. D. requires an external power supply to provide indication of temperature.
ANSWER: D.
TOPIC: 291002 KNOWLEDGE: K1.14 [2.3/2.4] QID: B3013 (P3011) Refer to the drawing of a simple thermocouple circuit (see figure below). A thermocouple temperature indication is initially 410°F with the reference (cold) junction at 125°F. An ambient temperature decrease lowers the reference junction temperature to 110°F, while the measuring junction temperature remains constant. Without temperature compensation for the reference junction, the new thermocouple temperature indication will be... A. 380°F. B. 395°F. C. 410°F. D. 425°F.
ANSWER: C.
TOPIC: 291002 KNOWLEDGE: K1.14 [2.3/2.4] QID: B309 (P1510) In contrast to a thermocouple, a resistance temperature detector... A. is used in high temperature applications. B. does not require an external power supply for temperature indication. C. uses a single type of metal or alloy in the sensing element. D. is commonly placed in direct contact with the monitored substance.
ANSWER: B.
TOPIC: 291002 KNOWLEDGE: K1.14 [2.3/2.4] QID: B5305 (P5305) Refer to the drawing of a simple thermocouple circuit (see figure below). The measuring and reference junctions are located inside the reactor containment building while the instrument is located in a remote location outside the containment building. Thermocouple temperature indication is initially 500°F. An ambient temperature decrease outside the containment building lowers the temperature of the instrument by 10°F, while the measuring and reference junction temperatures remain constant. Thermocouple temperature indication at the lower ambient temperature will be... A. 490°F. B. 500°F. C. 510°F. D. unpredictable.
ANSWER: D.
TOPIC: 291002 KNOWLEDGE: K1.14 [2.3/2.4] QID: B5507 (P5505) Refer to the drawing of a simple chromel-alumel thermocouple circuit (see figure below). What is the effect on the thermocouple reference junctions if the chromel and alumel extension wires from the thermocouple connection head to the reference junction panel are replaced with copper wires? A. There will no longer be any reference junctions. B. The reference junctions will be located in the temperature instrument. C. The reference junctions will still be located in the reference junction panel. D. The reference junctions will be located in the thermocouple connection head.
ANSWER: A.
TOPIC: 291002 KNOWLEDGE: K1.14 [2.3/2.4] QID: B5805 (P5805) Which one of the following is a characteristic of a resistance temperature detector but not a thermocouple? A. Sensing element is made from a single metal or alloy. B. Requires a reference junction for accurate temperature measurement. C. Extension leads made from relatively expensive metals or alloys are required for accurate temperature measurement. D. Temperature measurement relies on a sensor material property that varies directly with the change in the measured temperature.
ANSWER: C.
TOPIC: 291002 KNOWLEDGE: K1.14 [2.3/2.4] QID: B6005 (P6004) Refer to the drawing of a simple chromel-alumel thermocouple circuit (see figure below). What is the effect on the thermocouple reference junctions if the copper extension wires from the reference junction panel to the temperature instrument are replaced with alumel (top) and chromel (bottom) extension wires? A. The reference junctions will be located in the thermocouple connection head. B. The reference junctions will still be located in the reference junction panel. C. The reference junctions will be located in the temperature instrument. D. There will no longer be any reference junctions.
ANSWER: D.
TOPIC: 291002 KNOWLEDGE: K1.14 [2.3/2.4] QID: B6905 (P6905) A simple two-wire resistance temperature detector (RTD) is being used to measure the temperature of a water system. Copper extension wires run from the RTD to a temperature instrument 40 feet away. If the temperature of the extension wires decreases, the electrical resistance of the extension wires will __________; and the temperature indication will __________ unless temperature compensation is provided. A. increase; increase B. increase; decrease C. decrease; increase D. decrease; decrease
ANSWER: C.
TOPIC: 291002 KNOWLEDGE: K1.14 [2.3/2.4] QID: B7106 (P7103) A resistance temperature detector (RTD) and a thermocouple (TC) are commonly used sensors for temperature measurement. If a temperature display fails, which of the sensors, if any, has a property that can be measured manually and converted to a temperature value with the aid of conversion tables. A. TC only. B. RTD only. C. Both TC and RTD. D. Neither TC nor RTD.
ANSWER: C.
TOPIC: 291002 KNOWLEDGE: K1.14 [2.3/2.4] QID: B7405 (P7405) Refer to the drawing of a simple thermocouple circuit (see figure below). The measuring junction temperature is currently 300°F while the reference junction temperature is being held constant at 120°F. The thermocouple circuit is capable of indicating 32°F to 600°F and has just been calibrated at the current conditions. If the measuring junction temperature decreases and stabilizes at 90°F, what temperature will be indicated? A. 32°F B. 60°F C. 90°F D. 120°F
ANSWER: C.
TOPIC: 291002 KNOWLEDGE: K1.14 [2.3/2.4] QID: B7612 (P7612) For proper operation of a thermocouple circuit, the reference junction temperature... A. must be less than the measuring junction temperature. B. must be greater than the measuring junction temperature. C. may be less than, greater than, or equal to the measuring junction temperature. D. may be less than or greater than, but not equal to, the measuring junction temperature.
ANSWER: A.
TOPIC: 291002 KNOWLEDGE: K1.14 [2.3/2.4] QID: B7732 (P7732) A simple two-wire resistance temperature detector (RTD) is being used to measure the temperature in a water system. Copper extension wires run from the RTD to a temperature measuring instrument 40 feet away. If the temperature of the extension wires increases, the electrical resistance of the extension wires will __________; and the temperature indication will __________ unless temperature compensation is provided. A. increase; increase B. increase; decrease C. decrease; increase D. decrease; decrease
ANSWER: D.
TOPIC: 291002 KNOWLEDGE: K1.15 [2.6/2.8] QID: B1112 An operator suspects that a steam temperature instrument reading is not correct. A recently calibrated pressure gauge, which senses steam pressure for the same steam line, indicates 351 psig. Assuming the system is operating at saturated conditions, what is the actual steam temperature? A. 424°F B. 428°F C. 432°F D. 436°F
ANSWER: B.
TOPIC: 291002 KNOWLEDGE: K1.15 [2.6/2.8] QID: B1314 (P1209) Refer to the drawing of a simple thermocouple circuit (see figure below). A thermocouple temperature indication is initially 350°F. A small steam leak raises reference (cold) junction temperature by 20°F, while the measuring junction temperature remains constant. Without temperature compensation for the reference junction, the new temperature indication will be... A. 310°F. B. 330°F. C. 370°F. D. 390°F.
ANSWER: C.
TOPIC: 291002 KNOWLEDGE: K1.15 [2.6/2.8] QID: B2009 (P2011) Refer to the drawing of a simple thermocouple circuit (see figure below) that is calibrated for a reference junction temperature of 90°F. Thermocouple temperature indication is currently 150°F. Indicator range is from 0°F to 2000°F. Which one of the following temperature indications will result if one of the thermocouple extension wires loosens and becomes dislodged from its terminal in the reference junction panel? A. 0°F B. 60°F C. 90°F D. 2000°F
ANSWER: A.
TOPIC: 291002 KNOWLEDGE: K1.15 [2.6/2.8] QID: B208 (P414) A resistance temperature detector (RTD) is used in a balanced bridge circuit to indicate temperature. If the RTD develops an open circuit (bridge circuit remains intact), temperature indication will fail... A. high. B. low. C. as is. D. to midscale.
ANSWER: A.
TOPIC: 291002 KNOWLEDGE: K1.15 [2.6/2.8] QID: B2911 (P1412) Refer to the drawing of a simple thermocouple circuit (see figure below). A thermocouple temperature indication is initially 390°F. A small steam leak raises reference (cold) junction temperature by 20°F, while the measuring junction temperature remains constant. Without temperature compensation for the reference junction, the new temperature indication will be... A. 370°F. B. 390°F. C. 400°F. D. 410°F.
ANSWER: A.
TOPIC: 291002 KNOWLEDGE: K1.15 [2.6/2.8] QID: B310 (P312) If shorting occurs within a resistance temperature detector, the associated indication will fail... A. low. B. high. C. as is. D. to midscale.
ANSWER: A.
TOPIC: 291002 KNOWLEDGE: K1.15 [2.6/2.8] QID: B6306 (P6305) Refer to the drawing of a simple chromel-alumel thermocouple circuit (see figure below). The thermocouple, thermocouple connection head, and reference junction panel are located inside a reactor building (RB) while the temperature instrument is located outside the RB. Thermocouple temperature indication is initially 440°F. A steam leak inside the RB increases the temperatures of the thermocouple connection head and reference junction panel by 40°F, while the temperature at the measuring tip is unchanged. What is the resulting temperature indication? A. 400°F B. 440°F C. 480°F D. 520°F
ANSWER: C.
TOPIC: 291002 KNOWLEDGE: K1.15 [2.6/2.8] QID: B6506 (P6504) Because of a thermocouple temperature display failure, the millivolt output of a thermocouple circuit is being converted to a temperature value using conversion tables. The tables are based on a thermocouple reference junction temperature of 32°F. The actual reference junction is located in a panel that is maintained at 120°F. Room temperature surrounding the panel is 80°F. What adjustment must be made to the temperature value taken from the conversion tables to calculate the actual temperature at the measuring tip of the thermocouple? A. Add 48°F. B. Subtract 48°F. C. Add 88°F. D. Subtract 88°F.
ANSWER: A.
TOPIC: 291002 KNOWLEDGE: K1.15 [2.6/2.8] QID: B7206 (P7205) Because of a thermocouple temperature display failure, the millivolt output of a thermocouple circuit is being converted to a temperature value using conversion tables. The tables are based on a thermocouple reference junction temperature of 32°F. The actual reference junction is located in a panel that is currently at 80°F. The temperature value taken from the conversion tables is 120°F. What adjustment must be made to the temperature value taken from the conversion tables to calculate the actual temperature at the measuring tip of the thermocouple? A. Add 48°F. B. Subtract 48°F. C. Add 88°F. D. Subtract 88°F.
ANSWER: A.
TOPIC: 291002 KNOWLEDGE: K1.15 [2.6/2.8] QID: B7652 (P7652) Because of a thermocouple temperature display failure, the millivolt output of a thermocouple circuit is being converted to a temperature value using conversion tables. The tables are based on a thermocouple reference junction temperature of 32F. The actual reference junction is located in a panel that is maintained at 96F. Room temperature surrounding the panel is 72F. What adjustment must be made to the temperature value taken from the conversion tables to calculate the actual temperature at the measuring tip of the thermocouple? A. Add 64F. B. Subtract 64F. C. Add 40F. D. Subtract 40F.
ANSWER: B.
TOPIC: 291002 KNOWLEDGE: K1.15 [2.6/2.8] QID: B7761 (P7761) Refer to the drawing of a simple chromel-alumel thermocouple circuit (see figure below). The thermocouple, thermocouple connection head, and reference junction panel are located inside a reactor building (RB), while the temperature instrument is located outside the RB. Initially, the temperature instrument indicates 440°F. A steam leak outside the RB increases the temperature of the temperature instrument from 80°F to 120°F, while the temperatures at the thermocouple, thermocouple connection head, and reference junction panel remain unchanged. Assuming the temperature instrument remains operable, what is the resulting temperature indication? A. 400°F B. 440°F C. 480°F D. 560°F
ANSWER: A.
TOPIC: 291002 KNOWLEDGE: K1.15 [2.6/2.8] QID: B7771 (P7771) Refer to the drawing of a simple chromel-alumel thermocouple circuit (see figure below). Initially, the temperature instrument indicates 350°F. A steam leak inside the reactor building (RB) increases the temperature of the thermocouple connection head, reference junction panel, and extension wires inside the RB from 120°F to 160°F. The temperature at the location measured by the thermocouple remains the same. What is the resulting temperature indication? A. 310°F B. 350°F C. 390°F D. 430°F
ANSWER: C.
TOPIC: 291002 KNOWLEDGE: K1.16 [2.5/2.7] QID: B1712 (P1313) Which one of the following devices is commonly used to provide remote indication of valve position on an analog meter in units of "percent of full open"? A. Limit switch B. Reed switch C. Linear variable differential transformer D. Resistance temperature detector
ANSWER: D.
TOPIC: 291002 KNOWLEDGE: K1.16 [2.5/2.7] QID: B2611 Reed switches are being used in an electrical measuring circuit to monitor the position of a control rod in a reactor. The reed switches are mounted in a column below the reactor vessel such that the control rod drive shaft passes by the reed switches as the control rod is withdrawn. Which one of the following describes the action that causes the electrical output of the measuring circuit to change as the control rod is withdrawn? A. An AC coil on the control rod drive shaft induces a voltage into each reed switch as the drive shaft passes by. B. A metal tab on the control rod drive shaft mechanically closes each reed switch as the drive shaft passes by. C. The primary and secondary coils of each reed switch attain maximum magnetic coupling as the drive shaft passes by. D. A permanent magnet on the control rod drive shaft attracts the movable contact arm of each reed switch as the drive shaft passes by.
ANSWER: A.
TOPIC: 291002 KNOWLEDGE: K1.16 [2.5/2.7] QID: B2811 (P2813) Refer to the simplified drawing of a control rod position detector circuit (see figure below). A magnet on the control rod extension (or drive) shaft sequentially closes individual reed switches mounted vertically adjacent to the control rod drive housing. A constant +5 DC volts is supplied to the input of the resistor network at resistor R1. A control rod is initially fully inserted such that all reed switch contacts are open; then the rod is withdrawn until reed switch contact S1 is closed. Compared to the initial circuit currents, the current through resistor R5 after the rod withdrawal will be __________; and the output current of the resistor network to the amplifier will be __________. A. lower; higher B. lower; lower C. higher; higher D. higher; lower
ANSWER: B.
TOPIC: 291002 KNOWLEDGE: K1.01 [2.4/2.5] QID: B2506 (P2505) A main steam flow rate measuring instrument uses a steam pressure input to produce main steam mass flow rate indication. Assuming steam volumetric flow rate does not change, a steam pressure decrease will cause indicated steam mass flow rate to... A. increase, because the density of the steam has increased. B. decrease, because the density of the steam has decreased. C. remain the same, because steam pressure does not affect the mass flow rate of steam. D. remain the same, because the steam pressure input compensates for changes in steam pressure.
ANSWER: C.
TOPIC: 291002 KNOWLEDGE: K1.01 [2.4/2.5] QID: B508 As water flows through a venturi flow element, the __________ pressure and the __________ velocity of the fluid occurs at the throat of the venturi. A. highest; highest B. lowest; lowest C. lowest; highest D. highest; lowest
ANSWER: D.
TOPIC: 291002 KNOWLEDGE: K1.05 [3.1/3.1] QID: B607 (P8) How will flow rate indication be affected if the equalizing valve for the associated differential pressure detector is fully opened? A. Increase temporarily, and then return to initial value. B. Decrease temporarily, and then return to initial value. C. Increase to the maximum value. D. Decrease to the minimum value.
ANSWER: A.
TOPIC: 291002 KNOWLEDGE: K1.05 [3.1/3.1] QID: B608 (P607) The flow rate of water passing through a venturi can be determined by measuring the... A. differential pressure of the water as it passes through the venturi. B. change in the velocity of the water as it passes through the venturi. C. linear displacement of a metering plug installed in the throat of the venturi. D. rotation rate of a paddle wheel-type device installed in the throat of the venturi.
ANSWER: A.
TOPIC: 291002 KNOWLEDGE: K1.06 [2.8/2.9] QID: B510 (P14) Refer to the drawing of a water storage tank with two differential pressure (D/P) level indicators (see figure below). Indicator 1 was calibrated at 200°F and indicator 2 was calibrated at 100°F. If tank water temperature is 150°F, then... A. indicator 1 will read greater than indicator 2. B. indicator 2 will read greater than indicator 1. C. indicators 1 and 2 will read the same. D. both indicators will be inaccurate, but it is impossible to predict which indicator will read greater.
ANSWER: C.
TOPIC: 291002 KNOWLEDGE: K1.06 [2.8/2.9] QID: B4205 (P1907) Refer to the drawing of a water storage tank with two differential pressure (D/P) level indicators (see figure below). Indicator 1 was calibrated at 120°F and indicator 2 was calibrated at 180°F. If tank water temperature is currently 150°F, then indicator... A. 1 will read greater than indicator 2, and greater than actual level. B. 1 will read greater than indicator 2, and less than actual level. C. 2 will read greater than indicator 1, and greater than actual level. D. 2 will read greater than indicator 1, and less than actual level.
ANSWER: B.
TOPIC: 291002 KNOWLEDGE: K1.07 [3.2/3.2] QID: B5004 The downcomer region of a reactor vessel contains 40 feet of saturated water at 536°F. A reactor vessel water level detector has a pressure tap located at the bottom of the downcomer region. Approximately how much of the total pressure at the pressure tap is caused by the downcomer water? A. 0.6 psi B. 13.0 psi C. 27.7 psi D. 156.0 psi
ANSWER: D.
TOPIC: 291002 KNOWLEDGE: K1.07 [3.2/3.2] QID: B6705 (P6704) Refer to the drawing of a water storage tank with a differential pressure (D/P) level detection system (see figure below). Assume that the initial temperature of the reference leg and the water in the tank is 100°F, and that reference leg temperature does not change. If the temperature of the water in the tank increases by 20°F, the D/P sensed by the detector will __________ if the __________ of the water in the tank is constant. A. decrease; level B. decrease; mass C. remain the same; level D. remain the same; mass
ANSWER: B.
TOPIC: 291002 KNOWLEDGE: K1.07 [3.2/3.2] QID: B5204 Refer to the drawing of a differential pressure (D/P) level detection system (see figure below) for a reactor vessel at normal operating temperature and pressure. The level detector has just been calibrated. The high pressure side of the detector is connected to the __________; and if the equalizing valve is opened, the indicated reactor vessel level will be __________ than the actual level. A. condensing chamber; lower B. condensing chamber; higher C. reactor vessel; lower D. reactor vessel; higher
ANSWER: C.
TOPIC: 291002 KNOWLEDGE: K1.10 [2.4/2.5] QID: B410 (P413) If the pressure sensed by a bourdon tube increases, the curvature of the detector will __________ because the greater force is being applied to the __________ curve of the detector. A. increase; outer B. increase; inner C. decrease; outer D. decrease; inner
ANSWER: C.
TOPIC: 291002 KNOWLEDGE: K1.10 [2.4/2.5] QID: B610 (P2610) Refer to the drawing of a bellows type differential pressure (D/P) detector (see figure below). The spring in this detector (shown in a compressed state) has weakened from long term use. If the actual D/P is constant, how will indicated D/P respond as the spring weakens? A. Increase, because the spring will expand more B. Decrease, because the spring will expand more C. Increase, because the spring will compress more D. Decrease, because the spring will compress more
ANSWER: D.
TOPIC: 291002 KNOWLEDGE: K1.12 [2.3/2.5] QID: B611 Which one of the following parameters requires square root compensation when measured by a differential pressure detector? A. Reactor vessel level B. Condenser vacuum C. Reactor vessel pressure D. Recirculation pump flow rate
ANSWER: A.
TOPIC: 291002 KNOWLEDGE: K1.15 [2.6/2.8] QID: B4206 (P4206) Refer to the drawing of a simple thermocouple circuit (see figure below). Given that the temperatures at the measuring and reference junctions remain constant, if a ventilation system malfunction causes the temperature of the temperature indication panel to increase by 10°F, indicated temperature will... A. not be affected. B. increase by 10°F. C. decrease by 10°F. D. change in an unpredictable manner.
