Discussion
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- Question
Power required to drive a centrifugal pump is __________ proportional to N3.
Options- A. directly
- B. inversely
- Correct Answer
- directly
- 1. The discharge through a reaction turbine __________ with the increase in unit speed.
Options- A. remains same
- B. increases
- C. decreases Discuss
- 2. A draft tube is used with impulse turbines.
Options- A. Yes
- B. No Discuss
- 3. The flow ratio of Francis turbine is defined as the ratio of the
Options- A. velocity of flow at inlet to the theoretical jet velocity
- B. theoretical velocity of jet to the velocity of flow at inlet
- C. velocity of runner at inlet to the velocity of flow at inlet
- D. none of the above Discuss
- 4. The efficiency of jet propulsion for a ship with inlet orifices at right angles to the direction of motion of ship, will be maximum when the relative velocity of the jet and ship is equal to twice the velocity of the ship.
Options- A. Yes
- B. No Discuss
- 5. A Pelton wheel working under a constant head and discharge, has maximum efficiency when the speed ratio is
Options- A. 0.26
- B. 0.36
- C. 0, 46
- D. 0.56 Discuss
- 6. A jet of water enters and leaves a fixed curved vane tangentially. The force of jet along perpendicular to the vane is zero.
Options- A. True
- B. False Discuss
- 7. In a Francis 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
- 8. The depth of the bucket for a Pelton wheel is generally __________ the diameter of jet.
Options- A. equal to
- B. 1.2 times
- C. 1.8 times
- D. double Discuss
- 9. The force exerted (in newton) by a jetof water impinging normally on a fixed plate is (where w = Specific weight of water in N/m3, a = Cross-sectional area of jet in m2, and V = Velocity of jet in m/s)
Options- A.
- B.
- C.
- D.
Discuss
- 10. The relation between hydraulic efficiency (?h), mechanical efficiency (?m) and overall efficiency (?o) ) is
Options- A. ?h = ?o x ?m
- B. ?m = ?o x ?h
- C. ?o = ?h x ?m
- D. none of these Discuss
Hydraulic Machines problems
Search Results
Correct Answer: decreases
Correct Answer: No
Correct Answer: velocity of flow at inlet to the theoretical jet velocity
Correct Answer: Yes
Correct Answer: 0, 46
Correct Answer: False
Correct Answer: 16 to 24
Correct Answer: 1.2 times
Correct Answer:
Correct Answer: ?o = ?h x ?m
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