PREBOARD 1 - PIPE

A volumetric analysis of a gas mixture is a follows: CO2: 12% 02: 4% N2: 80% CO:4% What percentage of CO2 on a mass basis? A 17.55% B. 15.55% C. 12.73% D. 19.73%

A 17.55%

Compute the maximum length of the discharge pipe installed on an outlet of a pressure-relief device in feet for internal pipe diameter of 0.5 inch and rated discharge capacity is 8 lb/min of air. The rated pressure of relief valve is 10 psig. A. 0.286 ft B. 0.386 ft C. 0.486 ft D. 0.586 ft

A. 0.286 ft

Specific volume is the number of cubic meters of mixture per kilogram of dry air. If dry air has these following properties: Ra = 287 J/kg-K, T = 303 K, Pa = 99.604 kPa. Solve for the specific volume. A. 0.873 m3 /kg B. 0.853 m3/kg C. 0.953 m3 /kg D. 0.783 m3 /kg

A. 0.873 m3 /kg

Compute the specific volume of an air-vapor mixture in cubic meter per kg of dry air when the following conditions prevail: t = 40°C, w = 0.015 kg/kg, and P, = 90 kPa. A. 0.99 m/kg B. B. 0.89 m/kg C. C. 0.79 m/kg D. D. 0.69 m /kg

A. 0.99 m/kg

A heat source at 800 K losses 2000 kJ of heat to a sink at 500 K. Determine the entropy generated during this process. A. 1.5 kJ/K B. 2.5 kJ/K C. -2.5 kJ/K D. 4 kJ/K

A. 1.5 kJ/K

Steam turbine is receiving 1014 lb/hr of steam, determine the horsepower output of the turbine if the work done by steam is 251 Btu/lbm A. 100 hp B. 462.7 hp C. 200 hp D. 600 hp

A. 100 hp

used for condensing is 55°F and the evaporator is at 15°F. Calculate the ideal COP. A. 11.875 B. 12.875 C. 10.875 D. 13.875

A. 11.875

A mixture of 0.4 lbm of helium and 0.2 lbm of oxygen is compressed polytropically from 14.7 psia and 60°F to 60 psia according to n = 1.4. Determine the polytropic work. A. 139 Btu B. 239 Btu C. 339 Btu D. 539 Btu

A. 139 Btu

A Cubical tank of 2 m sides is constructed of metal plate 12 mm and contains water at 75°C. The surrounding air temperature is 16°C. Calculate the overall heat transfer coefficient from water to air. Take the coefficient of thermal conductivity of the metal as 48 W/m-K, the coefficient of heat transfer of water is 2.5 kW/m2-K and the coefficient of heat transfer of the air is 16 W/m2-K. A. 15.84 W/m2 C B. 14.84 W/m2-C C. 16.84 W/m2-C D .13.84 W/m2-C

A. 15.84 W/m2 C

Secondary refrigerant is a liquid used for the transmission of heat, without a change of state, and having no flash point or a flash point above as determined from ASTM. A. 150 F B. 160 F C. 180 F D. 200 F

A. 150 F

In a hydro-electric plant, water flows at 10 m/s in a penstock of 1 𝑚3 cross-sectional area. if the net head of the plant is 30 m and the turbine efficiency is 85%, what is the turbine output? A. 2,501.55 kW B. B. 2.100.21 kW C. C. 3,626.34 kW D. 3,124.65 kW

A. 2,501.55 kW

Compute the air flow in 𝑓𝑡3/min of mechanical ventilation required to exhaust an accumulation of refrigerant due to leaks of the system capable of revolving air from the machinery for a mass of 4 lbs refrigerant. A. 200 B. 210 C. 220 D. 230

A. 200

What is the resulting pressure when one kilogram of air at 104 kPa and 98°C is heated at constant volume to 450°C? A. 202.67 kPa B. 194.67 kPa C. 186.53 kPa D. 198.65 kPa

A. 202.67 kPa

A pelton type turbine has a gross head of 40 m and a friction head loss 6 m What is the penstock diameter if the penstock length is 90 m and the coefficient of friction head loss is 0.001 (Morse)? A. 2040 mm B. 3120 mm C. 2440 mm D. 2320 mm

A. 2040 mm

Boiling point of Freon-12 at atmospheric pressure is: A. 21 deg F B. 15 deg F C. 5 deg F D. 28 deg F

A. 21 deg F

Two boilers are operating steadily on 91000 kg of coal contained in a bunker. One boiler is producing 1591 kg of steam per hour at 1.2 factor of evaporation and an efficiency of 65% and another boiler produced 1364 kg of steam per hour at 1.15 factor of evaporation and an efficiency of 60%. How many hrs will the coal in the bunker run the boilers if the heating value of coal is 7,590 kcal/kg? A. 230.80 hrs B. 280.54 hrs C. 350.35 hrs D. 300.54 hrs

A. 230.80 hrs

The brake thermal efficiency of a 1 MW diesel electric plant is 36%. Find the heat generated by fuel in kW if the generator efficiency is 89%. A. 3,121.10 kW B. 3,528.64 kW C. 4.121.10 kW D. 4.528.64 kW

A. 3,121.10 kW

What is the work required to accelerate an 800-kg car from rest to 100 km/h on a level road? A. 308.6 kJ B. 806.3 kJ C. 608.3 kJ D. 386 kJ

A. 308.6 kJ

Calculate the use factor of a power plant if the capacity factor is 35% and it operates 8000 hrs during the year? A. 38.325% B. 33.825% C. 35.823% D. 32.538%

A. 38.325%

An unknown volume of container gas of 1 atmosphere is allowed to expand to another container of 10 𝑚3 volume at 500 mmHg at constant temperature. Find the unknown volume. A. 6.58 𝑚3 B. 6.75 𝑚3 C. 5.67 𝑚3 D. 7.65 𝑚3

A. 6.58 𝑚3

Three-hundred kilojoules of heat flow by conduction from the outside to the inside of a cold storage in one hour. If the temperature and all other conditions are the same, what is the heat flowing through the cold storage room in two hours? A. 600 kJ B. 900 kJ C. 300 kJ D. 1,200 kJ

A. 600 kJ

Find the work possess for a helium gas at 20°C. A. 609 kJ/kg B. 168 kJ/kg C. 229 kJ/kg D. 339 kJ/kg

A. 609 kJ/kg

Determine the air-standard efficiency of an engine operating on the diesel cycle with a clearance of 6% when the suction pressure is 99.7 kPa and the fuel is injected for 7% of the stroke. Assume k=1.4 A. 62.11% B. 51.20% C. 73.58% D. 60.02%

A. 62.11%

A two-stage air compressor at 100 kPa and 22°C discharges to 750 kPa. If the intercooler intake is 105°C, determine the value of n. A. 1.400 B. 1.326 C. 1.345 D. 1.288

B. 1.326

A water tube boiler has a capacity of 1000 kg/hr of steam. The factor of evaporation is 1.3, boiler rating is 200%, boiler efficiency is 65% and heating surface area is 0.91 𝑚2 per bo.Hp. The heating value of fuel is 18,400 kcal/kg. The total coal available in the bunker is 50,000 kg. Determine the no. of hrs. to consume the available fuel. A. 853.36 hrs B. 706.57 hrs C.979.46 hrs D. 100.75 hrs

A. 853.36 hrs

The lower half of a 10 m high cylindrical container is filled with water and the upper half with oil that has SG - 0.85. Determine the pressure difference between the top and bottom if the cylinder. A. 90.74 kPa B. 92.74 kPa C. 83.38 kPa D.0.98.10 kPa

A. 90.74 kPa

The COP of actual absorption refrigeration system is usually A. Less than 1 B. Less than 2 C. Less than 3 D. Less than 4

A. Less than 1

The type of flow occupying in a 1 cm diameter pipe which water flows at a velocity of 2.50 m/s. Use v = 1.13x10−6 𝑚2/s for water. A. Turbulent B. constant C. laminar D. none of these

A. Turbulent

Determine the pressure exerted on a diver at 30 m below the free surface of the sea Assume a barometric pressure of 101 kPa and the specific gravity of sea water is 1.03. A.404 kPa B. 410 kPa C. 420 kPa D. 430 kPa

A.404 kPa

The thermal efficiency of a Carnot cycle operating between 170°C and 620°C is closest to: A. 44% B. 50% C. 63% D. 73%

B. 50%

Compute the free aperture cross section in m for the ventilation of a machinery room if the mass of refrigerant is 9 kg. A. 0.314 B. B. 0.414 C. C. 0.514 D. D. 0.614

B. 0.414

What is the absolute pressure exerted on the surface of a submarine cruising 300 ft below the free surface of the sea? Assume specific gravity of sea water is 1.03. A. 133.9 psia B. 148.6 psia C. 100.7 psia D. 103.7 psia

B. 148.6 psia

Determine the quality of steam in a vessel containing 2 kg of saturated vapor and 8 kg of saturated liquid. A. 100% B. 20% C. 80% D. 60%

B. 20%

In an air-standard Brayton cycle the inlet temperature and pressure are 20°C and 101.325 kPa. The turbine inlet conditions are 1200 kPa and 900°C. Determine the air flow if the turbine produces 12 MW. A. 21.41 kg/s B. 20.20 kg/s C. 19.25 kg/s D. 18.10 kg/s

B. 20.20 kg/s

What is the power ratio of a pump and its 1/5 scale model if the ratio of heads is 4 to 1? A. 20 B. 200 C. 12.5 D. 125

B. 200

Consider a large furnace that can supply heat at a temperature of 2000°R at a steady rate of 3000 Btu/s. Determine the energy of this energy. Assume an environment temperature of 77°F. A. 2305.19 kW B. 2315.19 kW C . 2325.19 kW D . 2335.19 kW

B. 2315.19 kW

A centrifugal pump (efficiency 88%) lifts water through a total height of 40 m from a reservoir to discharge. Pumping is through 300 m of 75 mm diameter pipe at the rate of 20 liter/s. If pipe friction, f = 0.025, what horsepower is required? A. 28.4 kW B. 32.2 kW C. 25kW D. 9kW

B. 32.2 kW

An Otto cycle has a clearance of 8% and heat added of 1000 kj. Find the heat rejected. A. 564 kJ B. 353 kJ C.709 kJ D. 867 kJ

B. 353 kJ

Steam enters a turbine stage with an enthalpy of 3700 kj/kg and a velocity of 80 m/s and leaves with an enthalpy of 2864 kj/kg with a velocity of 12.8 m/s. If the rate of a steam flow through the turbine is 0.44 kg/s, what is the work done in kW? A. 365 kW B. 365.64 kW C. 366.0 kW D. 366.50 kW

B. 365.64 kW

Calculate the approximate enthalpy of water at 90°C. A. 366.83 kJ/kg B. 376.83 kJ/kg C. C. 386.83 kJ/kg D. D. 396.83 kl/kg

B. 376.83 kJ/kg

Find the enthalpy of water at 212°F and 14.7 psi if the dryness factor is 30%. Use the approximate enthalpy formula of liquid. A. 461 Btu/lb B. 471 Btu/lb C. 481 Btu/lb D. 491 Btu/lb

B. 471 Btu/lb

Seats and discs shall be limited in distortion, by pressure or other cause, to set pressure change of not more than in a span of five years. A. 1% B. 5% C. 10% D. 50%

B. 5%

A steam condenser receives 10 kg/s of steam with an enthalpy of 2770 kJ/kg. Steam condenses and leaves with an enthalpy of 160 kj/kg. Cooling water passes through the condenser with temperature increases from 13°C to 24°C. Calculate the water flow rate in kg/s. A. 583 B. 567 C. 523 D. 528

B. 567

A mixture of 0.4 lbm of helium and 0.2 lbm of oxygen is compressed polytropically from 14.7 psia and 60°F to 60 psia according to n = 1.4. Determine the final temperature, T2. A. 727.7°R B. 777.2°R C. 722.7°R D. 277.7°R

B. 777.2°R

A mixing tank mixes two inlet streams containing salt. The salt concentration in stream 1 is 5% by weight, at stream 2 it is 15% by weight. Stream 1 flows at 25 kg/s, and stream 2 flows at 10 kg/s. There is only one exit stream. Find the salt concentration in the exit stream A. 5% B. 8% C. 11% D. 13%

B. 8%

The average power output of a cylinder in a combustion engine is given by: P = pLAN where: p = average pressure on the piston during the stroke L = length of the piston stroke A = area of the piston head N = number of strokes per second An 8-ylinder engine has the following specifications p = 283 kPa L = 14 cm d = diameter of piston head - 12 cm N = 1500 strokes/min What is the average power output of this engine? A. 89.5 N/S B. 89.5 kW C. 89.5 x103 m/s D.89.5 kJ

B. 89.5 kW

The discharge pressure of an air compressor is 5 times the suction pressure. If volume flow at suction is 0.1 m3/s, what is the suction pressure if compressor work is 19.57 kW (use n = 1.35) A. 97 kpa B. 98 kpa C. 99 kpa D. 100 kpa

B. 98 kpa

What pressure is a column of water 100 centimeters high equivalent to? A. 9810 dyne/c𝑚2 B. 9810 N/𝑚2 C. 0.1 bars D. 0.1 atm

B. 9810 N/𝑚2

Needs only single pump regardless of number of heaters. A. Open heater B. Closed heater C. Mono heater D. Regenerative heater

B. Closed heater

Two kilogram of gas is confined in a 1 𝑚3 tank at 200 kPa and 88°C. What type of gas is in the tank? A Helium B. Ethane C. Methane D. Ethene

B. Ethane

Steam at 2 MPa and 250°C in a rigid cylinder is cooled until the quality is 30%. Find the heat rejected from the cylinder @ 2 Mpa and 250°C: v = 0.11144 𝑚3/kg u = 2679.6 kj/kg @ 2 Mpa, (saturated): vf = 0.0011767 𝑚3/kg, vfg = 0.09963 𝑚3/kg, uf= 906.44 kj/kg, ufg = 1693.8 kj/kg A. -423.23 kj/kg B. -926.26 kJ/kg C. -1265.02 kj/kg D. 1082.34 kJ/kg

C. -1265.02 kj/kg

A 10-stage air compressor compresses air from 100 kPa to 800 kPa. Find the intercooler pressure between the 1st and 2nd stage. A. 282.84 kPa B. 113.21 kPa C. 123.11 kPa D. 333.51 kPa

C. 123.11 kPa

A 305 mm x 457 mm four stroke single acting diesel engine is rated at 150 kW at 260 rpm. Fuel consumption at rated load is 0.56 kg/kW-hr with a heating value of 43,912 kJ/kg. Calculate the break thermal efficiency. A. 10.53% B. 27.45% C. 14.64% D. 18.23%

C. 14.64%

A 150 Hp motor is used to drive the compressor. If the heat loss from the compressor is 25 kW and the mass flow rate of the refrigerant entering the compressor is 0.50 kg/s, determine the difference of the enthalpies between the inlet and outlet of the compressor A. 143.80 kj/ kg B. 153.80 kj/ kg C. 173.20 kj/kg D. 183.80 kj/kg

C. 173.20 kj/kg

To what height will a barometer column rise if the atmospheric conditions are 13.9 psia and 68°F and barometer fluid is mercury? A. 3.56 ft B. 5.36 ft C. 2.36 ft D. 3.26 ft

C. 2.36 ft

Three thousand cubic feet per minute of air are circulated over an air-cooled condenser. If the load on the condenser is 64,800 Btu/hr, compute the temperature rise of the air passing over the condenser. Specific volume of standard air (13.34 𝑓𝑡3/lb). A. 10℉ B. 15℉ C. 20℉ D. 25℉

C. 20℉

A steam pipe having a surface temperature of 250°C passes through a room where the temperature is 27°C. The outside diameter of the pipe is 100 mm and emissivity factor is 0.8. Calculate the radiated heat loss for 3 m pipe length. A. 1434.47 W B. 3746.35 W C. 2851.82 W D. 3546.45 W

C. 2851.82 W

A furnace wall consists of 35 cm firebrick ( 1.557 W/m-K). 12 cm insulating refractory (k=0.346) and 20 cm common brick (k=0.692) covered with 7 cm steel plate (k=45). The temperature at the inner surface of the firebrick is 1,230°C and at the outer face of the steel plate is 60°C. Atmosphere is 27°C. What is the value of the combined coefficient for convection and radiation from the outside wall? A. 31.13 W/𝑚2K B. 30.13 W/ 𝑚2K C. 41.3 W/ 𝑚2K D. 40.13 W/𝑚2K

C. 41.3 W/ 𝑚2K

A Carnot cycle is represented by a rectangle in a T-S diagram that operates between temperature limits of 300K and 650K. Inscribed within a rectangle is an ellipse of maximum major and minor axes, represents a cycle and operating at the same temperature limits. Considering that the major axis of the ellipse is two times that of its minor axis, determine the thermal efficiency of the cycle. A. 52.32 % B. 63.42 % C. 44.88 % D. 35.55 %

C. 44.88 %

Water flowing at the rate of 10 m/s from an orifice at bottom of a reservoir. Find the pressure at the bottom of reservoir A. 30 kPa B. 40 kPa C. 50 kPa D. 60 kPa

C. 50 kPa

Determine the force in newton in a piston of 465 𝑚𝑚2 area with a pressure of 0.172 MPa. A. 65 N B. 72 N C. 80 N D. 111 N

C. 80 N

Pressure difference of 400 Pa is available to force 20°C air through a circular sheet metal duct 450 mm in diameter and 25 m long. At 20°C, p = 1.204 kg/𝑚3 and take friction factor, f = 0.016. Determine the velocity. A. 27.34 ft/s B. 43.72ft/s C. 89.68 ft/s D. 86.98 ft/s

C. 89.68 ft/s

A diesel power plant uses fuel with heating value of 43,000 kJ/kg. What is the density of the fuel at 25°C? A. 840 kg/𝑚2 B. 873 kg/𝑚2 C. 970 kg/𝑚2 D. 940 kg/𝑚2

C. 970 kg/𝑚2

Refrigerant number R-744 is A. Carbon monoxide B. Propane C. Carbon dioxide D. Butane

C. Carbon dioxide

Is one in which a secondary coolant is in direct contact with the air or other substance to be cooled or heated. A. Double indirect open spray system B. Indirect, inverted closed system C. Indirect open spray system D. Indirect closed system

C. Indirect open spray system

One kilogram of air is compressed adiabatically and in a steady-flow manner. The compression efficiency is 80% and the work done on the air is 265 kJ/kg. Compute the heat. A. 212 kJ/kg B. 100 kJ/kg C. O kJ/kg D. 331.25 kJ/kg

C. O kJ/kg

The quantity of refrigerant stored at some point is the refrigeration system for operational, service, or standby purposes A. Pressure vessel B. Liquid receiver C. Pumpdown charge D. Accumulator

C. Pumpdown charge

In an open feedwater heater for a steam plant, saturated steam at 7 bar is mixed with subcooled liquid at 7 bar and 25°C. Just enough steam is supplied to ensure that the mixed steam leaving the heater will be saturated liquid at 7 bar when heater efficiency is 95% Calculate the mass flow rate of the subcooled liquid if steam flow rate is 0.865 kg/s. Steam properties: PREBOARD 1 (PIPE) ES MECHANICAL ENGINEERING REVIEW @7 bar, saturated vapor: hg=2763.5kl/kg @7 bar and 25°C: hf=105.5k/kg @7 bar, saturated liquid: hf=697.22 k/kg A 2.725 kg/s B. 3.356 kg/s C.2.869 kg/s D. 3.948 kg/s

C.2.869 kg/s

A tank contains 90 𝑓𝑡3 of air at a pressure of 350 psig: if the air is cooled until its pressure and temperature decreases at 200 psig and 70°F respectively, what is the decrease in internal energy? A. 6232.09 Btu B. -5552 Btu C. 5552 Btu D. -6232.09 Btu

D. -6232.09 Btu

In most common design of gas turbine, the pressure ratio ranges from A. 10 to 12 B. 15 to 20 C. 12 to 18 D. 11 to 16

D. 11 to 16

What is the pressure at point A in the tank if h = 2 feet? (g = 32.2 ft/𝑠2 and p = 1.94 slug/ft3) A. 75 lbf/ft2 B. 85 lbf/ft2 C. 100 lbf/ft2 D. 125 lbf/ft2

D. 125 lbf/ft2

A hydro-electric plant having 30 sq. km reservoir area and 100 m head is used to generate power. The energy utilized by the consumers whose load is connected to the power plant during a five-hour period is 13.5x106 kWh. The overall generation efficiency is 75%. Find the fall in the height of water in the reservoir after the 5-hour period. A. 5.13 m B. 1.32 m C. 3.21 m D. 2.20 m

D. 2.20 m

A single acting compressor has a volumetric efficiency of 89%, operates at 500 rpm. It takes in air at 100 kPa and 30°C and discharges it at 600 kPa. The air handled is 8 𝑚3/min measured at discharged condition. If compression is isentropic, find the effective mean pressure in kPa. A. 233.34 B. 973.17 C. 198.34 D. 204.82

D. 204.82

Fish weighing 11,000 kg with a temperature of 20°C is brought to a cold storage and which shall be cooled to -10°C in 11 hours. Find the required plant refrigerating capacity in tons of refrigeration if the specific heat of fish is 0.7 kcal/kg -°C above freezing point and 0.30 kcal/kg-℃ below freezing point. The freezing point is -3°C. The latent heat of freezing is 55.5 kcal/kg. A. 25.26 TOR B. 15.26 TOR C. 14.38 TOR D. 24.38 TOR

D. 24.38 TOR

An oxygen cylinder of volume 2.3𝑓𝑡3 has a pressure of 2200 psig and is at 70°F. Determine the mass of oxygen in the cylinder. A. 25.66 lbs B. 26.66 lbs C. 27.66 lbs D. 28.66 lbs

D. 28.66 lbs

Steam flows through a nozzle at 400°C and 1 MPa (h = 3263.9 kJ/kg) with velocity of 300 m/s. Find the stagnation enthalpy. A. 3300 kj/kg B. 3290 kj/kg C. 3320 kJ/kg D. 3309 kj/kg

D. 3309 kj/kg

A Pelton type turbine was installed 30 m below the head gate of the penstock. The head loss due to friction is 12 percent of the given elevation. The length of the penstock is 100 m and the coefficient of friction is 0.00093. Determine the power output in kW. (Use Morse) A. 22,273 B. 23,234 C. 32,345 D. 34,452

D. 34,452

Find the power of a rotating shaft which develops a torque of 188 N·m at 1350 rpm. A. 101.54 hp B. 53.63 hp C. 63.35 hp D. 35.63 hp

D. 35.63 hp

How long must a current of 5.0 amperes pass through a 10 ohm resistor until a charge of 1200 coulombs passes through? A. 1 min B. 2 min C. 3 min D. 4 min

D. 4 min

To what height will a barometer column rise if the atmospheric conditions are 13.9 psia and 68°F and barometer fluid is ethyl alcohol? Note: 68°F; Pv= 138.5 lbs/ft3 and specific gravity of 0.79 for ethyl alcohol: A. 79.37 in B. 37.79 in C. 353 54 in D. 453.53 in

D. 453.53 in

much does 30 lbm weigh on the moon? (gmoon = 5.47 ft/𝑠2). A. 2.0 lbf B. 3.2 lbf C. 3.4 lbf D. 5.096 lbf

D. 5.096 lbf

Ten kilograms per second of steam enter the turbine with an enthalpy of 3200 kJ/kg and enter the condenser with an enthalpy of 2500 kj/kg in a Rankine cycle. If the turbine efficiency is 80% and the generator efficiency is 90%, determine the power plant output. A. 4320 kW B. 3213 kW C. 4056 kW D. 5040 kW

D. 5040 kW

A foundation measures 12 ft x 14 ft x 16 ft. Find the number of sacks of cement needed for a 1:2:4 mixture. A. 302 B. 404 C. 356 D. 598

D. 598

Compute the mass of a 2 𝑚3 propane at 280 kPa and 40°C. A. 6.47 kg B.5.1 kg C. 10.20 kg D. 9.47 kg

D. 9.47 kg

Water flowing at the rate of 10 m/s from an orifice at bottom of a reservoir. Find the pressure at the bottom of reservoir A. 6.47 kg B.5.1 kg C. 10.20 kg D. 9.47 kg

D. 9.47 kg

A refrigerating machine that is classified as a one-ton machine has the capacity to produce a cooling effect of? A. 3.516 B. 12,000 Btu/hr C. 211 kJ/min D. All of the above

D. All of the above

Type of condenser that operates like a cooling water A. Air-cooled condenser B. Water cooled condenser C. Shell and tube condenser D. Evaporative condenser

D. Evaporative condenser

Which of the following is not a possible location of service valve? A. Suction of compressor B. Discharge of compressor C. Outlet of liquid receiver D. Outlet of condenser

D. Outlet of condenser

A diesel engine consumed 945 liters of fuel per day at 35°C. If the fuel was purchased at 15.6°C and 30°API at P29.00/1i. Determine the cost of fuel to operate the engine per day. A. P5,677.50 B. P4,677.50 C. P48,088.90 D. P27,127.76

D. P27,127.76

Dominant refrigerant used in commercial refrigeration system A. R11 B. R22 C. R12 D. R502

D. R502

Is the speed of a turbine when the head on the turbine is one meter A. Specific speed B. Rated speed C. Utilized speed D. Unit speed

D. Unit speed

For immediate dangerous to life or health (IDHL), the maximum concentration from which unprotected persons are able to escape within _____ without escape-impairing symptoms or irreversible health. A.15 min B.1 min C.20 min D.30 min

D.30 min

What is the lower heating value LHV in BTU/lb of bunker fuel with an HHV of 18,400 BTU/lb and 11.5% hydrogen content? a. 17,279 b. 18,279 c. 16,279 d. 19,279

a. 17,279

model pump delivering water at 180F (𝛾=60.6 𝑙𝑏/𝑓𝑡^3; Pvapor = 7.54 psia) at 900 gpm and 2500 rpm begins to cavitate when the inlet pressure and velocity are 13 psia and 22 fps. Find the required NPSH of a prototype which is 4 times larger and runs at 1100 rpm. a. 63.5 ft b. 20.49 ft c. 6.61 ft d. 36 ft

a. 63.5 ft

Two particles collide, stick together and continue their motion together. Each particle has a mass of 10g and their respective velocities before collision were 10 m/s and 100 m/s. What is the energy of the system after the collision? a. 21.8 J b. 30.2 J c. 42.8 J d. 77.9 J

b. 30.2 J

What is the power required to transfer 97,000 coulombs of charge through a potential rise of 50 volts in one hour? a. 0.5 kW b. 0.9 kW c. 1.3 kW d. 2.8 kW

c. 1.3 kW

The specific gravity of mercury relative to water is 13.55. What is the specific weight of mercury? (The specific weight of water is 62.4 lbf per cubic foot) a. 82.2 kN/m3 b. 102.3 kN/m3 c. 132.9 kN/m3 d. 150.9 kN/m3

c. 132.9 kN/m3

1250 kW Caterpillar Model 3512 Diesel Generator weighing 10 MT is to be installed in a Metal Closure plant in Canlubang, Laguna. The D/G specification are as follows: Weight - 10,000 kgs RPM - 1800 Engine base - 1.0 mW x 3.5 mL Foundation - 1.6 mW x 4.1 mL base dimension Particular location is on hard clay (Safe bearing load of 56 psi or 39.4 MT/m^2). What is the foundation volume required based on an e = 0.11 value. Assume concrete density of 2.4 MT/m^3 in m^3? a. 15.44 b. 21.44 c. 19.44 d. 17.44

c. 19.44

A piston moves inside a cylinder at a velocity of 6.0 m/s. The 160 mm diameter piston is centrally located within the 160.2 mm inside diameter cylinder. The film of oil is separating the piston from the cylinder has an absolute viscosity of 0.4 N-s/𝑚2. Assuming a linear velocity profile, find the shear stress in the oil. (T = μ (v/H)). μ = 0.40 N-s/𝑚2 v = 5 m/s H = thickness of oil film = 160.2 - 160/2 = 0.1 mm a. 50,000 N/m^2 b. 40,000 N/m^2 c. 24,000 N/m^2 d. 34,000 N/m^2

c. 24,000 N/m^2