Discussion
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- Question
The water in a jet propelled boat is drawn through the openings facing the direction of motion of the boat. The efficiency of propulsion is given by
Options- A.
- B.
- C.
- D.
- Correct Answer
-
- 1. In an impulse turbine, the pressure of water both at entering and leaving the vanes, is atmospheric.
Options- A. Agree
- B. Disagree Discuss
- 2. The jet ratio is defined as the ratio of the
Options- A. diameter of jet to the diameter of Pelton wheel
- B. velocity of jet to the velocity of Pelton wheel
- C. diameter of Pelton wheel to the diameter of jet
- D. velocity of Pelton wheel to the velocity of jet Discuss
- 3. If the ratio of corresponding velocities at corresponding points are equal, then the model and the prototype are said to have dynamic similarity.
Options- A. Correct
- B. Incorrect Discuss
- 4. A turbine is required to develop 1500 kW at 300 r.p.m. under a head of 150 m. Which of the following turbine should be used?
Options- A. Pelton wheel with one nozzle
- B. Pelton wheel with two or more nozzles
- C. Kaplan turbine
- D. Francis turbine Discuss
- 5. The undershot water wheels are those in which
Options- A. the wheel runs entirely by the weight of water
- B. the wheel runs entirely by the impulse of water
- C. the wheel runs partly by the weight of water and partly by the impulse of water
- D. none of the above Discuss
- 6. In an outward 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
- 7. A jet of water enters and leaves a fixed curved vane tangentially. The force of the jet along normal to the vane is (where ? and ? = Inlet and outlet angles of the jet respectively)
Options- A.
- B.
- C.
- D.
Discuss
- 8. Which of the following pump is suitable for small discharge and high heads?
Options- A. Centrifugal pump
- B. Axial flow pump
- C. Mixed flow pump
- D. Reciprocating pump Discuss
- 9. In a centrifugal pump, the regulating valve is provided on the
Options- A. casing
- B. delivery pipe
- C. suction pipe
- D. impeller Discuss
- 10. Which of the following is not an impulse turbine?
Options- A. Girad turbine
- B. Turgo turbine
- C. Pelton wheel
- D. Kaplan turbine Discuss
Hydraulic Machines problems
Search Results
Correct Answer: Agree
Correct Answer: diameter of Pelton wheel to the diameter of jet
Correct Answer: Incorrect
Correct Answer: Pelton wheel with one nozzle
Correct Answer: the wheel runs entirely by the impulse of water
Correct Answer: the water enters at the centre of the wheel and then flows towards the outer periphery of the wheel
Correct Answer:
Correct Answer: Reciprocating pump
Correct Answer: delivery pipe
Correct Answer: Kaplan turbine
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