Discussion
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- Question
A Pelton wheel develops 1750 kW under a head of 100 metres while running at 200 r.p.m. and discharging 2500 litres of water per second. The unit discharge of wheel is
Options- A. 0.25 m3/s
- B. 0.5 m3/s
- C. 1.5 m3/s
- D. 2.5 m3/s
- Correct Answer
- 0.25 m3/s
- 1. In an inward flow reaction turbine
Options- A. the water flows parallel to the axis of the wheel
- B. the water enters at the centre of the wheel and then flows towards the outer periphery of the wheel
- C. the water enters the wheel at the outer periphery and then flows towards the centre of the wheel
- D. the flow of water is partly radial and partly axial Discuss
- 2. The overall efficiency of an impulse turbine is the ratio of the actual power produced by the turbine to the energy actually supplied by the turbine.
Options- A. Yes
- B. No Discuss
- 3. A reciprocating pump is suitable for less discharge and higher heads.
Options- A. True
- B. False Discuss
- 4. In order to avoid cavitation in centrifugal pumps
Options- A. the suction pressure should be high
- B. the delivery pressure should be high
- C. the suction pressure should be low
- D. the delivery pressure should be low Discuss
- 5. Kinematic similarity is said to exist between the model and the prototype, if both of them
Options- A. have identical velocities
- B. are equal in size and shape
- C. are identical in shape, but differ only in size
- D. have identical forces Discuss
- 6. By fitting an air vessel to the reciprocating pump, there is always a saving of work done and subsequently saving of power. This saving in case of a single acting reciprocating pump is
Options- A. 39.2%
- B. 48, 8%
- C. 84.8%
- D. 88.4% Discuss
- 7. In a Francis turbine, the pressure at inlet is __________ that at outlet.
Options- A. less than
- B. more than Discuss
- 8. Which type of the pump is different from others in the same group?
Options- A. Screw pump
- B. Gear pump
- C. Cam and piston pump
- D. Plunger pump Discuss
- 9. In a reciprocating pump, air vessels are used to
Options- A. smoothen the flow
- B. reduce suction head
- C. increase delivery head
- D. reduce acceleration head Discuss
- 10. The unit power developed by a turbine is (where P = Power developed by the turbine under a head of water (H))
Options- A.
- B.
- C.
- D.
Discuss
Hydraulic Machines problems
Search Results
Correct Answer: the water enters the wheel at the outer periphery and then flows towards the centre of the wheel
Correct Answer: Yes
Correct Answer: True
Correct Answer: the suction pressure should be high
Correct Answer: have identical velocities
Correct Answer: 84.8%
Correct Answer: more than
Correct Answer: Plunger pump
Correct Answer: reduce acceleration head
Correct Answer:
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