Discussion
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- Question
Power required to drive a centrifugal pump is directly proportional to __________ of its impeller.
Options- A. diameter
- B. square of diameter
- C. cube of diameter
- D. fourth power of diameter
- Correct Answer
- fourth power of diameter
- 1. The specific speed from 160 to 500 r.p.m. of a centrifugal pump indicates that the pump is
Options- A. slow speed with radial flow at outlet
- B. medium speed with radial flow at outlet
- C. high speed with radial flow at outlet
- D. high speed with axial flow at outlet Discuss
- 2. The maximum number of jets, generally, employed in an impulse turbine without jet interference are
Options- A. two
- B. four
- C. six
- D. eight Discuss
- 3. The discharge of a double acting reciprocating pump is (where L = Length of stroke, A = Cross-sectional area of piston, and N = Speed of crank in r.p.m.)
Options- A. L.A.N
- B. 2 L.A.N
- C.
- D.
Discuss
- 4. The efficiency of a Pelton wheel working under constant head __________ with the increase in power.
Options- A. remains same
- B. increases
- C. decreases Discuss
- 5. Delivery head of water of a centrifugal pump is inversely proportional to diameter of its impeller.
Options- A. Yes
- B. No Discuss
- 6. Manometric head, in case of a centrifugal pump, is equal to
Options- A. Suction lift + Loss of head in suction pipe due to friction + Delivery lift + Loss of head in delivery pipe due to friction + Velocity head in the delivery pipe
- B. Workdone per kN of water - Losses within the impeller
- C. Energy per kN at outlet of impeller - Energy per kN at inlet of impeller
- D. all of the above Discuss
- 7. Which of the following pump is preferred for flood control and irrigation applications?
Options- A. Centrifugal pump
- B. Axial flow pump
- C. Mixed flow pump
- D. Reciprocating pump Discuss
- 8. In a Kaplan turbine runner, the number of blades are generally between
Options- A. 2 to 4
- B. 4 to 8
- C. 8 to l6
- D. 16 to 24 Discuss
- 9. In an impulse turbine, the jet of water impinges on the bucket with a low velocity and after flowing over the vanes, leaves with a high velocity.
Options- A. True
- B. False Discuss
- 10. The discharge of a centrifugal pump working under constant head __________ with the speed.
Options- A. increases
- B. decreases Discuss
Hydraulic Machines problems
Search Results
Correct Answer: high speed with axial flow at outlet
Correct Answer: six
Correct Answer:
Correct Answer: increases
Correct Answer: No
Correct Answer: all of the above
Correct Answer: Axial flow pump
Correct Answer: 4 to 8
Correct Answer: False
Correct Answer: increases
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