Discussion
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- Question
The efficiency of a Pelton wheel working under constant head __________ with the increase in power.
Options- A. remains same
- B. increases
- C. decreases
- Correct Answer
- increases
- 1. Delivery head of water of a centrifugal pump is inversely proportional to diameter of its impeller.
Options- A. Yes
- B. No Discuss
- 2. The static head of a centrifugal pump is equal to the __________ of suction head and delivery head.
Options- A. product
- B. difference
- C. sum Discuss
- 3. The speed ratio of a Francis turbine is defined as the ratio of the theoretical jet velocity to the peripheral speed at inlet.
Options- A. Yes
- B. No Discuss
- 4. When the speed of the pump increases, its net positive suction head (NPSH) requirement decreases.
Options- A. Agree
- B. Disagree Discuss
- 5. The specific speed of a centrifugal pump, delivering 750 litres of water per second against a head of 15 metres at 725 r.p.m., is
Options- A. 24.8 r.p.m.
- B. 48.2 r.p.m
- C. 82.4 r.p.m.
- D. 248 r.p.m Discuss
- 6. 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
- 7. 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
- 8. 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
- 9. 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
- 10. 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
Hydraulic Machines problems
Search Results
Correct Answer: No
Correct Answer: sum
Correct Answer: No
Correct Answer: Disagree
Correct Answer: 82.4 r.p.m.
Correct Answer:
Correct Answer: six
Correct Answer: high speed with axial flow at outlet
Correct Answer: fourth power of diameter
Correct Answer: all of the above
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