# Hydraulic Machines Questions and Answers – Multistage Centrifugal Pumps for High Heads

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

1. A multistage centrifugal pumps has more than two _______
a) Pumps
b) Impellers
c) Turbines
d) Magnetic pumps

Explanation: A multistage centrifugal pumps has more than two impellers. The multistage centrifugal is similar to the centrifugal pumps working.

2. The impeller is mounted on a ________
a) Draft tube
b) Throttle bush
c) Stuffing box
d) Shaft

Explanation: The impeller is mounted on one shaft or different shaft. A multistage centrifugal pump has more than two impellers. The multistage centrifugal is similar to the centrifugal pumps working.

3. At each stage the fluid is directed ________
a) Towards the centre
b) Away the centre
c) Towards the surface
d) Away from the centre

Explanation: At each stage in the centrifugal pump, the fluid is directed to towards the centre. A multistage centrifugal pump has more than two impellers. The multistage centrifugal is similar to the centrifugal pumps working.

4. If the cylinder is filled with fuel or air it is said to be ___________
a) 100% efficient
b) Transfer efficient
c) Nil efficient
d) Flow effective

Explanation: If the cylinder is filled with fuel or air, it is said to be 100 percent efficient. It plays a major role in regulating the flow of fluid.

5. SOH in a pump stands for_______
b) Shut off heat
c) Shut off hybrid

Explanation: SOH in a pump stands for Shut OFF head. The shut off head is located at the maximum head of the pipe.

6. At higher pressures, the impeller is connected in _______
a) Series
b) Parallel
c) Equilibrium
d) Series and parallel

Explanation: At higher pressures, the impeller is connected in series. The impeller is mounted on one shaft or different shaft. A multistage centrifugal pump has more than two impellers. The multistage centrifugal is similar to the centrifugal pumps working.

7. When the flow output is higher, impellers are connected in________
a) Series
b) Parallel
c) Equilibrium
d) Series and parallel

Explanation: When the flow output is higher, impellers are connected in parallel. The impeller is mounted on one shaft or different shaft. A multistage centrifugal pump has more than two impellers. The multistage centrifugal is similar to the centrifugal pumps working.

8. The point at which piping system controls the flow rate is called ______
a) Pressure point
b) Static lift
c) Operating point
d) Flow point

Explanation: The point at which piping system controls the flow rate is called operating point of the pump. It plays a major role in controlling the piping system before regulation.

9. What is the common application of multistage centrifugal pump?
a) Mineral industries
b) Boiler feed water pump
c) Removes ores
d) Detects oil

Explanation: The most common application of multistage centrifugal pump is boiler feed water pump.

10. A multistage centrifugal pump produces a pressure of __________
a) 10 Pa
b) 100 MPa
c) 21 MPa
d) 150 MPa

Explanation: A multistage centrifugal pump produces a pressure of 21 MPa. A multistage centrifugal pump has more than two impellers. The multistage centrifugal is similar to the centrifugal pumps working.

11. All energy that is transferred from the fluid is derived from ________
a) Electrical energy
b) Mechanical energy
c) Thermal energy
d) Chemical energy

Explanation: All energy that is transferred from the fluid is derived from Mechanical energy. A multistage centrifugal pump has more than two impellers. The multistage centrifugal is similar to the centrifugal pumps working.

12. The point at which the centrifugal pump operates at maximum efficiency is called _______
a) Duty point
b) Flow point
c) Static point
d) Operating point

Explanation: The point at which the centrifugal pump operates at maximum efficiency is called duty point. It is determined by the flow rate of the pump.

13. The energy transferred can be measured by isentropic compression.
a) True
b) False

Explanation: The energy transferred in a centrifugal pump can be measured by isentropic compression. The multistage centrifugal is similar to the centrifugal pumps working.

14. What does TDH stand for?

Explanation: TDH stands for total dynamic head. It is total height at which fluid is to be pumped for maximum effiency.

15. The mechanical energy is developed by the impeller.
a) True
b) False

Explanation: The mechanical energy is developed by the impeller. The energy transferred in a centrifugal pump can be measured by isentropic compression. The multistage centrifugal is similar to the centrifugal pumps working. Thus, it is true.

Sanfoundry Global Education & Learning Series – Hydraulic Machines.

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