Practice quiz EPO 125 test 2 (valves)
64. VL: Which symbol shown in the illustration is used to identify a stop-check valve on a drawing? (SG-0014) D A B C
D
28. VL: Which of the following statements represents the proper relative direction of flow through a globe valve? Direction of flow should be from below the seat Direction of flow through the valve is unimportant Direction of flow through the valve depends upon the type of seat design used in the valve Direction of flow should be form above the seat
Direction of flow should be from below the seat
66. VL: The device illustrated is in the process of opening or closing the associated valve. If the manual engaging lever is moved to the "engage" position, the result will be _______. (GS-0026) That nothing unusual will happen Severe damage to the unit The external, handwheel will rotate clockwise The external, handwheel will rotate counterclockwise
That nothing unusual will happen
56. VL: Water continues to flow well after the device shown in the illustration should have closed. Which of the following statements represents the probable cause? (GS-0155) "E" has jammed into a position other than horizontal and the sliding sleeve has become jammed at the nase of the stem connected to "A" Piece "H" has fallen out of "C" With "C" in the closed position, the total force in chamber "I" greatly exceeds the total force in chamber "II" "E" has jammed into a position other than horizontal and the sliding sleeve has moved to the top of the stem connected to "A"
"E" has jammed into a position other than horizontal and the sliding sleeve has become jammed at the nase of the stem connected to "A"
55. VL: If water continues to trickle into the toilet bowl after the device shown in the illustration has apparently closed, the problem is likely due to ________. (GS-0155) 'C" having developed a warp or ripple at the seating surface "E" being stuck or held in a position other than horizontal A problem with "H" that allows continuous low flow across the device "A" being cocked into a fully open postition
'C" having developed a warp or ripple at the seating surface
32. VL: Which of the valves listed will be cycled from fully open to fully closed when the handle is turned 90o? A butterfly valve A rising stem gate valve A globe stop valve A check valve
A butterfly valve
2. VL: Which of the valves listed should be used either in the fully opened or the fully closed position? A gate valve A globe valve Any check valve Any needle valve
A gate valve
30. VL: The seat of a butterfly valve will most likely be constructed of _______> A resilient material Monel Stellite Admiralty metal
A resilient material
36. VL: Excessive leakage and premature failure of valve packing is a result of _______. A scored valve stem Opening a valve to quickly Jamming a valve in the closed position Low pressure fluid flow through the pipeline
A scored valve stem
51. VL: Water flow is established through the unit shown in the illustration when ______. (GS-0155) All answer choices are correct "E" is moved from the position shown "A" is tilted off of its seat Total force above "C" is reduced below the value of the total force acting beneath "C"
All answer choices are correct
50. VL: Water flow occurs through the unit shown in the illustration when _______.(GS-0155) All answer choices are correct. "A" is tilted off of its seat "C" lifts due to the decrease in pressure on top of the diaphragm "E" is moved from the position shown
All answer choices are correct.
17. VL: A swing check valve is used in a pipeline to ________. Allow flow in one direction only Maintain a preset pressure on the line Closely regulate the amount of flow Relieve excess pressure on the line
Allow flow in one direction only
12. VL: On tankers using manually operated tank valves, the deck handwheel indicator registers the ______. Approximate number of turns the tank valve has been opened Exact lift position of the tank valve disk, through 100% of its operation Oxygen content of the tank Level of oil in the tank
Approximate number of turns the tank valve has been opened
5. VL: The illustrated valve is recommended for use______. (GS-0047) As either fully opened or fully closed In throttling fluid flow In allowing flow in one direction only In lube oil systems exclusively
As either fully opened or fully closed
15. VL: A non-rising stem gate valve should _______. Be opened to the end of the last opening turn, then rotate the handwheel in the closing direction by approximately ¼ of a turn Be completely opened with the handwheel locked hard at the end of the last opening turn Be opened by ½ of the total number of turns available from full closed to full open Be opened as much as needed, regardless of how little the gate has been moved from its seat
Be opened to the end of the last opening turn, then rotate the handwheel in the closing direction by approximately ¼ of a turn
39. VL: Which of the problems listed could happen if you attempted to force open a valve "frozen" in position by using a wrench on the handwheel? Bending of the valve stem Over compression of the packing Rapid corrosion of the valve disc Cracking of gaskets upstream of the valve
Bending of the valve stem
40. VL: Which of the problems listed could happen if you attempted to force open a valve "frozen" in position by using a wrench on the handwheel? Bending of the valve stem Bending of the bonnet assembly Damage to the pressure seal Distortion of the valve body
Bending of the valve stem
41. VL: When a vessel is drydocked for inspection, which of the following valves are required to be opened during this period? Bottom blow skin valves to the main and auxiliary boilers Ballast pump manifold valves High and low suction valves on foil oil settling tanks Cooling water control valves on refrigeration condensers
Bottom blow skin valves to the main and auxiliary boilers
31. VL: The valve depicted in the illustration shown is a _________. (GS-0055) Butterfly valve Gate valve Check valve Globe valve
Butterfly valve
65. VL: On tank vessels, which of the listed valve types is most commonly used in conjunction with hydraulically actuated controls? Butterfly valve Gate valve Globe valve Nonreturn valve
Butterfly valve
74. VL: On tankers using hydraulic tank valve actuation, which of the listed valve types has the highest tendency to develop leaks relative to the valve, and results in more frequent maintenance? Butterfly valves Gate valves Globe valves Check valves
Butterfly valves
63. VL: Coast Guard Regulations (46 CFR) specifically prohibit seats or disks in pressure vessel relief valves to be made of __________. Cast iron Bronze Brass Stainless steel
Cast iron
18. VL: Which of the valves listed below permits flow in only one direction? Check valve Gate valve Globe valve Plug cock
Check valve
26. VL: The use of a needle valve in a piping system is recommended when requiring ______. Close regulation of flow High pressure drops No pressure drops No back flow
Close regulation of flow
48. VL: The device shown in the illustration is used to ________. (GS-0155) Control flush water to toilets and urinals Maintain proper sanitary system operating pressure Provide pressure relief in low pressure systems Inject emergency feed water into high pressure vessels
Control flush water to toilets and urinals
75. VL: Coast Guard Regulations (46 CFR) require all power-operated valves, other than those opened against spring force, to have an energy storage system. That energy storage system shall be capable of _______. Cycling all connected valves at once Cross connection to an alternate power supply Operating any valve independently Closing the boiler quick-closing fuel valves
Cycling all connected valves at once
22. VL: The illustrated valve "A" needs to be repaired due to a leak across the valve disk. To repair the valve you should ________. (GS-0140) Disassemble the valve and renew the replaceable valve disk seat Replace the entire valve bonnet and stem as a unit as provided by the manufacturer Remove the handwheel, then remove part #4 and #5, then replace item #6 and reassemble in the reverse order Disassemble and renew the replaceable valve body seat
Disassemble the valve and renew the replaceable valve disk seat
68. VL: With regards to the illustrated device, if the unit is engaged to use the manual handwheel for the opening and closing of the associated valve, pushing either the remote "open" or "close" push buttons during this mode of operation will __________. (GS-0026) Disengage the manual control Cause severe damage to the unit Rotate the external, handwheel clockwise Rotate the external, handwheel counterclockwise
Disengage the manual control
59. VL: Foot valves are primarily designed to _________. Enable a pump and its suction line to remain primed prior to starting the pump Give a pump motor or driver positive protection when operating in a shutoff condition Provide a means of supplying sealing fluid for the impeller shaft stuffing box Afford the pumping system protection against water hammer and surging
Enable a pump and its suction line to remain primed prior to starting the pump
21. VL: The illustrated valve, figure A, needs to be repaired due to a leak across the valve disk. To disassemble the valve you should _________? (GS-0140) First fully loosen part #8, then turn the handwheel clockwise to separate the bonnet from the body Turn the hand wheel clockwise as viewed from the top using a pipe wrench for assistance First fully loosen part #8, then turn the handwheel counterclockwise to separate the bonnet form the body Tighten part #4
First fully loosen part #8, then turn the handwheel clockwise to separate the bonnet from the body
47. VL: The device shown in the illustration is a _______. (GS-0155) Flush valve Relief valve Hydro-kineter Back pressure regulator
Flush valve
46. VL: The bilge pump suction manifold, shown in the illustration, is provided with _______.(GS-0042) Four stop-check valves Four stop valves Three normally opened valves and one normally closed valve Three normally closed valves and one normally opened valve
Four stop-check valves
14. VL: On tankers with manually operated tank valves, the type of valve most commonly used is the _______. Gate valve Butterfly valve Globe valve Check valve
Gate valve
6. VL: If used for regulating flow through a piping system, which of the following valves listed could be damaged? Gate valve Plug valve Globe valve Needle valve
Gate valve
62. VL: Coast Guard Regulations (46 CFR) require that tank sounding pipes terminating below the freeboard deck of a cargo vessel must be fitted with a _________. Gate valve Globe valve Stop-check valve Check valve
Gate valve
9. VL: When in the completely opened position, which of the listed valves will offer the least resistance to flow? Gate valve Globe valve Double-seat poppet valve Reed valve
Gate valve
7. VL: What type of valve is shown in the illustration? (GS-0047) Gate valve - rising gate Globe valve - rising stem Gate valve - rising stem Globe valve - rising disk
Gate valve - rising gate
25. VL: Which of the valves listed below is best suited for throttling service? Globe Plug Gate Butterfly
Globe
23. VL: The valve best suited for throttling gas or liquid flow in a pipeline is the _____. Globe valve Gate valve Check valve Plug cock
Globe valve
24. VL: The valve which is most suited for regulating the flow through a pipeline is a ________. Globe valve Gate valve Swing-check valve Plug-cock valve
Globe valve
73. VL: On tank vessels equipped with the power operated cargo tank valves, the type of power operator most commonly used is _________. Hydraulic Electric Steam Diesel
Hydraulic
3. VL: A gate valve installed in a piping system should be used _______ In either fully closed or fully opened positions Only with the stem facing down Only for lube oil service To throttle the flow of liquid
In either fully closed or fully opened positions
57. VL: If water continues to flow excessively from the device shown in the illustration, the problem is most likely due to________. (GS-0155) Item "H" being fouled or plugged "E" being stuck or held in a position other than indicated in the illustration A hole being formed in the outboard edge of "C" A hole developing in "B"
Item "H" being fouled or plugged
29. VL: Very small irregularities on the seat and disk of a globe valve may be manually repaired with the valve in place by the process known as _______. Lapping in Honing Refacing Spotting in
Lapping in
37. VL: Which of the following conditions can develop if a valve with a badly scored stem is repacked? Leaking and premature failing of the packing The valve disk will crack The valve disk will become corroded The valve seat will sustain damage due to fretting
Leaking and premature failing of the packing
67. VL: When the illustrated device is in the process of opening the associated valve, the motor will be secured by the action of the ________. (GS-0027) Limit switch Torque switch Manual stop only Disengaging of the splined dog clutch
Limit switch
70. VL: The device shown in the illustration is used to open and close a butterfly valve. The motor will typically be secured by the use of the ________. (GS-0027) Limit switch Torque switch Two-position, micro switch Manual, push button only
Limit switch
1. VL: The needle valve (piece #3) shown in the illustration, is held in the test valve body (piece #2) by a_______. (GS-0020) Machine screw thread Press fit Spring loaded clamp Fillet weld
Machine screw thread
72. VL: An electric motor driven (torque producing) remotely controlled, valve actuator is installed on the high sea suction with the "red" indicator light illuminated. When the "open" push button is depressed, the "green" indicator light comes on momentarily and then goes out, without any appreciable movement of the valve. Which of the following actions should be carried out? Manually engage the actuator handwheel and "break" the valve disk from its seat, then push the "open" button. Alternately depress the "close" and "open" buttons to get the valve open. Secure power, tag out system and make repairs because the valve stem has been sheared. Secure the breaker to this device, then switch the motor leads and push the open button.
Manually engage the actuator handwheel and "break" the valve disk from its seat, then push the "open" button.
61. VL: Coast Guard Regulations (46 CFR) concerning shut-off valves located in fuel oil tanks, state that the valves __________. May be made of cast iron Shall be arranged for local control Must be made of steel Must be power operated
May be made of cast iron
53. VL: Which of the following statements would apply to the principle of operation of the device shown in the illustration?(GS-0155) Once "A" is reseated, the total force developed in chamber "I" will gradually rise to exceed the total force in chamber 'II" and reseat "C" to stop water flow through the unit The pressure in chamber "I" is greater than the pressure in chamber "II" causing part "A" to close off, and force "C" into a closed position Continuing holding down "E" will hold "A" off of its seat, allowing water to continuously flow from chamber "I" to chamber "III" via chamber "II" "D" will be physically and directly raised by the movement of "E", forcing "C" to become unseated
Once "A" is reseated, the total force developed in chamber "I" will gradually rise to exceed the total force in chamber 'II" and reseat "C" to stop water flow through the unit
54. VL: According to the illustration, which of the following statements represents the order of events required to occur for the device to close? (GS-0155) Once "C" has lifted, "A" will reseat with water passing through "H", pressure gradually builds in chamber "I" developing sufficient force to reseat "C". A vacuum is created in chamber "III" as water flows from the toilet , drawing "C" into the closed position A vacuum is created in chamber "III" as a result of the high flow rate of water passing through the this chamber drawing "C" down on its seat Releasing "E" physically draws the "C" down on its seat
Once "C" has lifted, "A" will reseat with water passing through "H", pressure gradually builds in chamber "I" developing sufficient force to reseat "C".
13. VL: On vessels using reach rods to manually control the tank valves, on turn of the handwheel on deck will produce how many turns of the valve stem at the valve? One turn One-fourth turn One-half turn Three-fourths turn
One turn
8. VL: Compared to globe and angle valves, gate valves _______ Operate with little or no pressure drop when fully opened Are more suitable for throttling Are more easily repaired Cannot be used for service requiring infrequent operation
Operate with little or no pressure drop when fully opened
34. VL: The valve illustrated is to be constructed so that the ________. Operating lever is parallel to the flow when open and perpendicular to the flow when closed Operating lever is parallel to the pipe center line when closed and perpendicular to the pipe center line when open Valve can have additional turns of packing added when there is pressure on either side of the valve disk Valve seat can be relapped as needed
Operating lever is parallel to the flow when open and perpendicular to the flow when closed
42. VL: The handle of a butterfly valve must be _________. Parallel to the flow when in the fully open position Parallel to the axis of flow when the valve is closed Forty-five degrees to the axis of flow when the valve is fully open Either at 0o or 90o but never at any other angle regardless of flow rate
Parallel to the flow when in the fully open position
60. VL: The device illustrated is used as a ________. (GS-0054) Pressure reducing valve Refrigeration system packless valve Quick closing valve High pressure diesel engine air start valve
Pressure reducing valve
35. VL: The illustrated valve is ___________. (GS-0055) Quickly opened by moving the control lever by one-quarter turn Opened or closed by moving the lever through one or more complete turns Required to be closed by moving the control handle counter clockwise Quickly opened when the control lever is rotated by one full turn
Quickly opened by moving the control lever by one-quarter turn
71. VL: The device depicted in the illustration is used to ________. (GS-0026) Remotely open piping system valves Jack over the main engine Power an elevator car Power a centrifuge
Remotely open piping system valves
43. VL: Valves used in machinery space piping systems, and constructed with threaded valve stems must be________. Right hand closing (clockwise) Right hand opening (clockwise) Left hand closing (counterclockwise) Direction of opening and closing is unimportant
Right hand closing (clockwise)
10. VL: An inverted gate valve (stem pointing downward) may be subject to wear sooner than a similar valve installed in the upright position because _________. Sediment collects in the bonnet The gates full weight is upon the stem The gland stud nuts are under more pressure The packing will not properly adhere to the stem
Sediment collects in the bonnet
44. VL: All of the manifold valves shown in the illustration are _________. (GS-0042) Stop-check or stop valves Gate valves Stop valves operated from above the bulkhead deck Stop-check lift valves operated from above the bulkhead deck
Stop-check or stop valves
45. VL: The overboard discharge valves in the bilge system illustrated are ________. (GS-0042) Stop-check valves Gate valves Gate valves operated from above the bulkhead deck Swing check valves operated from above the bulkhead deck
Stop-check valves
16. VL: The device shown in the illustration is a ________. (GS-0056) Swing check valve Ball check valve Lift check valve Piston check valve
Swing check valve
38. VL: An eroded valve disk can be repaired by _________. Taking a light cut in a lathe Sandblasting with a light weight grit Dressing the seat with crocus cloth Scraping with a bastard file
Taking a light cut in a lathe
52. VL: Which of the following statements is correct concerning the operation of the device shown in the illustration? (GS-0155) The tilting of "A" from its seat releases the pressure from above "C" Only by releasing "E" will the unit be able to shut itself off For the unit to be activated, "A" can only be moved initially in line with the axis of the unit The movement of "E" will directly push "D" in a smooth vertical motion
The tilting of "A" from its seat releases the pressure from above "C"
19. VL: Which of the following statements regarding the illustrated device is true? (GS-0056) The valve disk alone can be removed for replacement or reconditionig If the valve disk is damaged, the entire valve unit must be replaced The plug, located in the upper left portion of the valve body can be removed to install a feedback pipe line if the valve is to be used as a pilot choke The cap determines the height of lift of the swinging valve disk
The valve disk alone can be removed for replacement or reconditionig
27. VL: An 8-inch (203 mm), globe type, stop-check valve has been installed in the lube-oil cooler water outlet, with the flow coming in from the top of the disk. This means that The valve will never permit water flow from the lube oil cooler The valve will remain completely open The valve will prevent back flow The valve will allow the lube oil temperature to be 10o F (5.5o C) cooler than if the valve were properly installed
The valve will never permit water flow from the lube oil cooler
49. VL: The component labeled "H" as shown in the illustration is used as a/an ______. (GS-0155) Time delay Pressure reducer Check valve Injector
Time delay
33. VL: Which of the following statements concerning butterfly valves is correct? To close the valve, it is only necessary to turn the handle a quarter of a turn Special tools are required for lapping or grinding It is impossible to throttle flow with a butterfly valve The butterfly valve should never be used in a freshwater system
To close the valve, it is only necessary to turn the handle a quarter of a turn
69. VL: When a non-butterfly valve is closed, the motor of the device illustrated will be secured by a ________. (GS-0027) Torque switch Limit switch Two-position, micro switch Manual, push button only
Torque switch
20. VL: You would close the illustrated valve "A" by _______. (GS-0140) Tuning the handwheel clockwise, as viewed from the top First loosening part #4, closing the valve, then retightening part #4. Turning the handwheel counterclockwise, as viewed from the top First looseneing part #8, then turning the handwheel clockwise as viewed from the top
Tuning the handwheel clockwise, as viewed from the top
4. VL: A gate valve installed in a pipeline should be______. Used in either the fully closed or fully opened position Installed with the stem down Used for steam service only Used to throttle or regulate the flow of liquid
Used in either the fully closed or fully opened position
11. VL: Gate valves should not be used for throttling as ________. Wire drawing of the disc will result The pressure drop will be excessive Air binding will develop The installation of an equalizing line will be necessary
Wire drawing of the disc will result
58. VL: As sometimes utilized with centrifugal pumps operating with a high suction lift, foot valves are primarily designed to_________. Enable the pump and its suction line to remain primed prior to starting the pump Give the pump motor, or driver, positive protection when operating in a shutoff condition Provide a means of supplying sealing fluid for the impeller shaft Afford the pumping system protection against water hammer and surging
Enable the pump and its suction line to remain primed prior to starting the pump
