Hydraulic Machines Questions and Answers – Priming Centrifugal Pumps

This set of Hydraulic Machines Multiple Choice Questions & Answers (MCQs) focuses on “Priming Centrifugal Pumps”.

1. When a pump casing is filled with liquid before it is started, it is called as _________
a) Adiabatic expansion
b) Priming
c) Adiabatic compression
d) Isentropic expansion
View Answer

Answer: b
Explanation: When a pump casing is filled with liquid before it is started, it is called as priming. Most of the centrifugal pumps are not self priming. At this stage, the pump will not be able to function.

2. The pump will become incapable of pumping in case of _______
a) Gas bounding
b) Throttle bush
c) Stuffing box
d) Casing breakage
View Answer

Answer: d
Explanation: For an oil field to have solid control, it needs centrifugal pumps. At each stage in the centrifugal pump, the fluid is directed to towards the centre. This makes it more efficient in operating a large oil field.

3. Priming is needed when impeller cannot impart enough _________
a) Draft speed
b) Energy
c) Pressure
d) Heat
View Answer

Answer: b
Explanation: Priming is needed when impeller cannot impart enough energy. Therefore priming is compulsory in this case.
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4. Priming performs response using ________
a) Stimulus
b) Froth
c) Slurry
d) Heat
View Answer

Answer: a
Explanation: Priming performs response using a stimulus. It is an implicit method in which exposure to flow of fluid takes place.

5. To avoid gas bounding, the pump is _________
a) Heated
b) Elevated
c) Primed
d) Charged
View Answer

Answer: c
Explanation: Centrifugal pumps work under the same principle, but differ in their functions. At each stage in the centrifugal pump, the fluid is directed to towards the centre. To avoid gas bounding, the pump is primed.

6. Centrifugal pumps are located ________ the level of source
a) Below
b) Above
c) Parallel with
d) Series with
View Answer

Answer: a
Explanation: Centrifugal pumps are located below the level of source. It is located in such way because, it takes away the suction at a faster rate.

7. A pump that can evacuate air is called as _________
a) Series pumps
b) Self priming pumps
c) Froth pumps
d) Drive pumps
View Answer

Answer: b
Explanation: A pump that can evacuate air is called as self priming pumps. In normal conditions, it is difficult for centrifugal pumps to evacuate the air from the inlet line leading to a fluid level to a different altitude.

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8. What does CPO stand for?
a) Centrifugal pump operation
b) Centrifugal part operation
c) Centrifugal pump output
d) Centrifugal part output
View Answer

Answer: a
Explanation: CPO stands for centrifugal pump operation. It has got a pump start off procedure and pump shut down procedure.

9. Self priming pumps overshadow the function of __________
a) Self auxiliary device
b) Wear rate
c) Corrosion device
d) Cavitation device
View Answer

Answer: a
Explanation: Self priming pumps overshadow the function of self auxiliary device. A pump that can evacuate air is called as self priming pumps. In normal conditions, it is difficult for centrifugal pumps to evacuate the air from the inlet line leading to a fluid level to a different altitude.
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10. What is necessary for self priming to take place?
a) Draft tube
b) Pump casing
c) Suspended solenoids
d) Turbine head
View Answer

Answer: b
Explanation: For self priming to take place, pump casing is necessary. This helps to evacuate air in normal conditions.

11. Centrifugal pumps with an internal suction stage are called as _________
a) Series pumps
b) Self priming pumps
c) Froth pumps
d) Drive pumps
View Answer

Answer: b
Explanation: Centrifugal pumps with an internal suction stage are called as self priming pumps. A pump that can evacuate air is called as self priming pumps. In normal conditions, it is difficult for centrifugal pumps to evacuate the air from the inlet line leading to a fluid level to a different altitude.

12. Two phase mixture is pumped unit the suction line is evacuated.
a) True
b) False
View Answer

Answer: a
Explanation: Two phase mixture is pumped unit the suction line is evacuated as the pump operates without a foot valve and without an evacuation device on the suction side. The pump has to be primed for this purpose.

13. During normal working operation, the pump works like __________
a) Centrifugal pumps
b) Self priming pumps
c) Froth pumps
d) Drive pumps
View Answer

Answer: a
Explanation: Pump shaft is not always supported by bearings. Since the pumps have no bearing support. The pumps are provided with a housing. During normal working operation, the pump works like centrifugal pumps.

14. The pump function that works on rinsing is called as dialysis of pump.
a) True
b) False
View Answer

Answer: a
Explanation: Yes, The pump function that works on rinsing is called as dialysis of pump.

15. What is purpose of vent valve in a pump?
a) High pressure control
b) High temperature control
c) Froths are generated can be minimized
d) To prevent siphon action
View Answer

Answer: d
Explanation: The main function of a suction swindle valve or vent valve in a centrifugal pump is to prevent any siphon action and ensure that the fluid remains in the casing when the pump has been stopped.

Sanfoundry Global Education & Learning Series – Hydraulic Machines.

To practice all areas of Hydraulic Machines, here is complete set of 1000+ Multiple Choice Questions and Answers.

If you find a mistake in question / option / answer, kindly take a screenshot and email to [email protected]

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Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He lives in Bangalore, and focuses on development of Linux Kernel, SAN Technologies, Advanced C, Data Structures & Alogrithms. Stay connected with him at LinkedIn.

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