This set of Hydraulic Machines Questions and Answers for Aptitude test focuses on “Minimum Speed for Starting Centrifugal Pump”.
1. Vertical centrifugal pumps are also called as ________
a) Froth pumps
b) Multistage pumps
c) Cantilever pumps
d) Magnetic pumps
View Answer
Explanation: Vertical centrifugal pumps are also called as cantilever pumps. They utilize a unique shaft and bearing support for configuration. Thus, it is called as cantilever pumps.
2. Vertical pump uses _______
a) Draft tube
b) Throttle bush
c) Stuffing box
d) Interlining
View Answer
Explanation: Vertical pumps use throttle bush. They do not use stuffing box. Vertical centrifugal pumps are also called as cantilever pumps. They utilize a unique shaft and bearing support for configuration. Thus, it is called as cantilever pumps.
3. When the casing in a centrifugal pump decelerates the flow, what increases?
a) Pressure
b) Temperature
c) Volume
d) Flow rate
View Answer
Explanation: When the casing in a centrifugal pump decelerates the flow, pressure in the turbine increases. The diffuser helps this happen. The shape of the diffuser passing present in the centrifugal pump is doughnut shaped.
4. The maximum volumetric efficiency of a pump(100cc) is ________
a) 60%
b) 70%
c) 80%
d) 90%
View Answer
Explanation: The primary objective of a centrifugal pump is to transfer energy. Centrifugal pump is a turbomachinery. Turbomachines are machines that transfer energy between a rotor and a fluid, including both turbines and compressors. It is a mechanical device.
5. The most common application of vertical centrifugal pump is used in _______
a) Parts washer
b) Mineral industry
c) Paper plating
d) Jukebox
View Answer
Explanation: The most application of the vertical centrifugal pump is used in parts washer. Vertical pumps use throttle bush. They do not use stuffing box. Vertical centrifugal pumps are also called as cantilever pumps.
6. What does BEP stand for?
a) Best efficiency point
b) Brake ejection point
c) Break effect point
d) Best effect point
View Answer
Explanation: BEP stands for Best efficient point. It is a point at which Shut off and Run out point. It helps to identify the pumps performance.
7. The height of a column in a pump is called as _______
a) Vertical head
b) Horizontal head
c) Static head
d) Multi head
View Answer
Explanation: In a centrifugal pump, the height of the column is called as a static head. Static head corresponds to the pressure depending on the weight.
8. The centrifugal pump has varying flow depending on the _________
a) Pressure
b) Static lift
c) Volume
d) Flow rate
View Answer
Explanation: Due to pressure variations there are changes that take place in the centrifugal pump. Thus, the flow keeps varying.
9. What is purpose of froth in froth pumps?
a) Separates rich minerals
b) Mixes rich minerals
c) Removes ores
d) Detects oil
View Answer
Explanation: The main function of the froth in froth pumps is to separate rich minerals. It is also used to separate bitumen from the sand and the clays.
10. Froth contains air that blocks the pumps.
a) True
b) False
View Answer
Explanation: Froth contains air that blocks the pumps. The main function of the froth in froth pumps is to separate rich minerals. It is also used to separate bitumen from the sand and the clays.
11. When froth blocks the pump, it leads to _______
a) Separation of rich minerals
b) Mixing of rich minerals
c) Removing of ores
d) Loss of prime
View Answer
Explanation: When froth blocks the pump, it leads to loss of prime. The main function of the froth in froth pumps is to separate rich minerals. It is also used to separate bitumen from the sand and the clays.
12. What affects volumetric efficiency of the pump?
a) Complex interactions
b) Internal interactions
c) Retain flow
d) Air flow
View Answer
Explanation: The volumetric efficiency of the centrifugal is affected due to complex interactions. Thus, some engines use two intake manifolds.
13. The Positive Displacement Pump has more or less a constant flow regardless of the system pressure or head.
a) True
b) False
View Answer
Explanation: The Positive Displacement Pump has more or less a constant flow regardless of the system pressure or head.
14. What is the purpose of inducer in a froth pump?
a) It recirculates air
b) The pressurizes the air
c) Froths are generated
d) It breaks the bubbles
View Answer
Explanation: The purpose of the inducer in a froth pump is to break the bubbles. The main function of the froth in froth pumps is to separate rich minerals. It is also used to separate bitumen from the sand and the clays.
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