1 If pump delivers no liquid, then probable cause is [ a ]
(a)Lack of prime
(b) Gas or air in liquid
(c) Bent shaft
(d) Moisture in lubricating oil
Answer : (a)Lack of prime
2 If pump discharge pressure is low, then probable cause is [ b ]
(a) Lack of prime
(b) Gas or air in liquid
(c) Bent shaft
(d) Moisture in lubricating oil
Answer : (b) Gas or air in liquid
3 If there is excessive vibration in pump, then probable cause is [ c ]
(a) Lack of prime
(b) Gas or air in liquid
(c) Bent shaft
(d) Moisture in lubricating oil
Answer : (c) Bent shaft
4 If the bearing of pump overheats, then probable cause is [ d ]
(a) Lack of prime
(b) Gas or air in liquid
(c) Bent shaft
(d) Moisture in lubricating oil
Answer : (d) Moisture in lubricating oil
5 If pump overloads the driver, then probable cause is [ a ]
(a) Packing too tight
(b) Suction line not filled with liquid
(c) Gas or liquid in air
(d) None of the above
Answer : (a) Packing too tight
6 Which of the following is not a criteria of pump selection [ d ]
(a) Type of duty required
(b) Details of head
(c) Duration of availability of power supply
(d) The look of pump.
Answer : (d) The look of pump.
7. HS Pump works with suction head. [ b ]
(a) 15-20 feet head
(b) 21-40 feet head
(c) 41-80 feet head
(d) None of the above.
Answer : (b) 21-40 feet head
8. VS Pump works with total head [ b ]
(a) Upto 46 Mtrs. head.
(b) 46-70 Mtrs. head
(c) 70-100 Mtrs. Head
(d) None of the above
Answer : (b) 46-70 Mtrs. head
9. Motor of the VS pump is located [ a ]
(a) Above the ground level
(b) Below the ground level
(c) Deep in the bore
(d) None of the above
Answer : (a) Above the ground level
10. Line shaft of the VS pump is lubricated [ c ]
(a) Spindle oil
(b) Diesel oil
(c) Lub oil SAE-40/30
(d) None of the above
Answer : (c) Lub oil SAE-40/30
11. Priming is required for [ a ]
(a) HS Pump
(b) VS Pump
(c) Submersible Pump
Answer : (a) HS Pump
12. RPM of submersible pump set is [ d ]
(a) 440
(b) 1440
(c) 380
(d) 2800
Answer : (d) 2800
13. Which pump is most suitable for deep & tilted bore [ c ]
(a) HS Pump
(b) VS Pump
(c) Submersible
(d) Jet pump
(e) None of above.
Answer : (c) Submersible
14. Redevelopment of bore is done [ b ]
(a) For smooth operation of pump
(b) For taking good yield for bore
(c) To maintain long life of bore
(d) To avoid the frequent failure of the pump
Answer : (b) For taking good yield for bore
15. Capacity of pump set is selected on the ground of [ a ]
(a) Yield, Static-water-level, Working-water-level.
(b) Location of bore
(c) Type of starter provided
(d) Quantity of water to be used.
Answer :(a) Yield, Static-water-level, Working-water-level.
16. Pump fails mostly due to [ b ]
(a) Less working
(b) Excessive working
(c) Incorrect operation
(d) Failure of pump
Answer :(b) Excessive working
17. Pump set motor burns due to [ a ]
(a) Single phasing
(b) Reverse phasing
(c) Over loading for a shorter period
(d) None of above.
Answer :(a) Single phasing
18. For a 10 HP pump set which type of starter is suitable [ b ]
(a) DOL
(b) Start Delta
(c) Auto Transformer
(d) None of the above
Answer :(b) Start Delta
19. A 5 HP pump set draws current on full load [ c ]
(a) 5 A
(b) 10 A
(c) 7.5 A
(d) 6 A
Answer : (c) 7.5 A
20. Ammeter is provided in control panel of pump set to measure the [ d ]
(a) Voltage
(b) Frequency
(c) Power Factor
(d)Current
Answer : (d)Current
21. No. of contractors provided in star-delta starter [ c ]
(a) 1
(b) 2
(c) 3
(d) 4
Answer : (c) 3
22. Pump Guard functions to protect the submersible pump set against [ e ]
a) Single Phasing
b) Reverse Phasing
c) Over Loading
d) Dry Running
e) All of above.
Answer :e) All of above.
23. Automation of pump set is done to [ d ]
a) To limit the working of pumps
b) To avoid the working of water
c) To save the electrical energy
d) To reduce the man power
e) All of the above.
Answer : d) To reduce the man power
24. Centralized control of pumps means [ b ]
a) Operation of pump from individual pump houses
b) Operation of all pumps from a single location
c) None of the above
Answer : b) Operation of all pumps from a single location
25. The functional head due to flow of water in the pipe line---- length of piping system. [ b ]
a) Inversely proportional to
(b) Directly proportional to
(c) Constant and independent of
(d) None of the above.
Answer : (b) Directly proportional to
26. The functional head due to flow of water in the pipe line---- Diameter of pipe. [ a ]
a) Inversely proportional to
b) Directly proportional to
(c) Constant and independent of
(d) None of the above.
Answer : a) Inversely proportional to
27. The functional head due to flow of water in pip line is directly proportional to---- of water.
a) Velocity
b) (Square root of) Velocity
c) 1 / Velocity
d) Velocity2
Answer : a) Velocity
28. The average of velocity of water in the suction pipe --- the delivery pipe. [ a ]
a) Less than in
(b) More than in
(c) Same as in
(d) None of the above.
Answer : a) Less than in
29. Theoretically the maximum suction head for ordinary centrifugal pumps should not exceed. [ b ]
a) 20 feet
(b) 34 feet
(c) 10 feet
(d) 5 feet.
Answer : (b) 34 feet
30. For vertical shaft pump and submersible pumps the suction head is always. [ a ]
(a) Positive
(b) Negative
(c) Zero
(d) None of the above.
Answer : (a) Positive
31. The motor of vertical shaft, 75 HP rating pump is. [ c ]
(a) Force air cooled
(b) Natural air cooled
(c) Water cooled.
(d) None of the above.
Answer :(c) Water cooled.
32. The specific speed of pump (in RPM) is the speed at which the impeller would run to give discharge of --- against head of ---- [ a ]
(a) 1 GPM, 1 Foot
(b) 1 GPH, 1 Foot
(c) 1 GPM, 34 feet
(d) 1 GPH, 34 feet
Answer : (a) 1 GPM, 1 Foot
33. The specific speed of pump is directly proportional to ---- where ‘Q’ is rate of discharge in GPH. [ a ]
(a) (Square root) Q
(b) Q
(c) Q2
(d) None of the above.
Answer : (a) (Square root) Q
34. The specific speed of pump is directly proportional to --- where ‘N’ is speed of pump in RPM. [ b ]
(a) Square root (N)
(b) N
(c) N2
(d) None of the above.
Answer : (b) N
35. Positive displacement pumps are generally less efficient than centrifugal pumps. State whether the statement is true or false [ b ]
(a) True
(b) False
Answer : (b) False
36. Installing larger diameter pipe in pumping system results in reduction in--------
a) static head
b) frictional head
c) both a and b
d) neither a nor b
Answer : b) frictional head
37. Generally water pipe lines are designed with water velocity of [ b ]
a) < 1 m/s
b) up to 2.0 m/s
c) > 2 m/s
d) None of the above
Answer : b) up to 2.0 m/s
38. What is the impact on flow and pressure when the impeller of a pump is trimmed? [ c ]
a) Flow decreases with increased pressure
b) Both flow and pressure increases
c) Both pressure and flow decreases
d) None of the above
Answer : c) Both pressure and flow decreases
39. For high flow requirement, pumps are generally operated in [ a ]
a) parallel
b) series
c) any of the above
d) none of the above
Answer : a) parallel
40. “In case of throttling operation, the pump has to overcome additional pressure in order to deliver the reduced flow”. Please indicate whether this statement is [ a ]
a) True
(b) False
Answer : a) True
41. Friction losses in a pumping system is------ [ b ]
a) proportional to 1/Q
b) proportional to 1/Q2
c) proportional to 1/Q3
d) proportional to 1/Q4
Answer : b) proportional to 1/Q2
42. For large capacity centrifugal pumps, design efficiencies are in the range of [ b ]
a) around 70%
b) around 85%
c) around 95%
d) any of above
Answer : b) around 85%
43. The moving part in centrifugal pump is ----- [ a ]
a) impeller
b) diffuser
c) both a & b
d) neither a nor b
Answer :a) impeller
44. The most efficient method of flow control in a pumping system is------- [ b ]
a) Throttling the flow
b) Speed control
c) Impeller trimming
d) None
Answer : a) Throttling the flow
45. In case of increased suction lift from open wells, the delivery flow rate-------- [ b ]
a) increases
b) decreases
c) remains same
d) none of the above
Answer : b) decreases
46. Pump efficiency generally increases with specific speed. State whether the statement is True or False. [ a ]
a) True
(b) False
Answer :a) True
47. Throttling the delivery valve of a pump results in increased ____. [ c ]
a) head
b) power
c) both (a) and (b)
d) either (a) or (b)
Answer : c) both (a) and (b)
48. The operating point in a pumping system is identified by [ c ]
a) Point of intersection of system curve and efficiency curve
b) Point of intersection of pump curve and theoretical power curve
c) Point of intersection of pump curve and system curve
d) Cannot be decided by pump characteristic curves
Answer : c) Point of intersection of pump curve and system curve
49. The intersection point of the pump curve and the system curve is called-------- [ b ]
a) Pump efficiency
b) Best efficiency point
c) System efficiency
d) None of the above
Answer : b) Best efficiency point
50. If the speed of a centrifugal pump is doubled, its power consumption increases by------- times. [ c ]
a) two
b) four
c) eight
d) no change
Answer :c) eight
51. Installation of Variable frequency drives (VFD) allows the motor to be operated with ____. [ a ]
a) lower start-up current
b) higher start-up current
c) constant current
d) none of the above
Answer :a) lower start-up current
52. In case of centrifugal pumps, impeller diameter changes are generally limited to reducing the diameter to about ____ of maximum size. [ a ]
a) 75%
b)50%
c) 25%
d) None of the above
Answer : a) 75%
53. If the delivery valve of the pump is throttled such that it delivers 30% of the rated flow, one of the best options for improved energy efficiency would be [ c ]
a) Trimming of the impeller
b) Replacing the motor
c) Replacing the impeller with a smaller size impeller
d) None of the above
Answer : c) Replacing the impeller with a smaller size impeller
54. Small by-pass lines are installed some times to _____. [ c ]
a) control flow rate
b) control pump delivery head
c) prevent pump running at zero flow
d) reduce pump power consumption
Answer : c) prevent pump running at zero flow
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