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- Question
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
- Correct Answer
- the suction pressure should be high
- 1. 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
- 2. The impeller of a centrifugal pump may have
Options- A. volute casing
- B. volute casing with guide blades
- C. vortex casing
- D. any one of these Discuss
- 3. In a centrifugal pump, the water enters the impeller __________ and leaves the vanes axially.
Options- A. axially
- B. radially Discuss
- 4. An impulse turbine is used for
Options- A. low head of water
- B. high head of water
- C. medium head of water
- D. high discharge Discuss
- 5. By fitting an air vessel to the reciprocating pump, there is always a saving of work done and subsequently saving of power.The saving in case of a double acting reciprocating pump is
Options- A. 39.2%
- B. 48.8%
- C. 84.8%
- D. 88.4% Discuss
- 6. A reciprocating pump is suitable for less discharge and higher heads.
Options- A. True
- B. False Discuss
- 7. 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
- 8. 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
- 9. 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 Discuss
- 10. 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
Hydraulic Machines problems
Search Results
Correct Answer: have identical velocities
Correct Answer: any one of these
Correct Answer: radially
Correct Answer: high head of water
Correct Answer: 39.2%
Correct Answer: True
Correct Answer: Yes
Correct Answer: the water enters the wheel at the outer periphery and then flows towards the centre of the wheel
Correct Answer: 0.25 m3/s
Correct Answer: 84.8%
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