Hydraulic Machines problems
- 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
Correct Answer: high speed with axial flow at outlet
- 2. 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 Discuss
Correct Answer: fourth power of diameter
- 3. 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
Correct Answer: all of the above
- 4. 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
Correct Answer: Axial flow pump
- 5. 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
Correct Answer: 4 to 8
- 6. 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
Correct Answer: False
- 7. The discharge of a centrifugal pump working under constant head __________ with the speed.
Options- A. increases
- B. decreases Discuss
Correct Answer: increases
- 8. Which of the following turbine is preferred for 0 to 25 m head of water?
Options- A. Pelton wheel
- B. Kaplan turbine
- C. Francis turbine
- D. none of these Discuss
Correct Answer: Kaplan turbine
- 9. Work done by a turbine __________ upon the weight of water flowing per second.
Options- A. depends
- B. does not depend Discuss
Correct Answer: depends
- 10. The principle of jet propulsion is used in driving the ships and aeroplanes.
Options- A. Correct
- B. Incorrect Discuss
Correct Answer: Correct
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