Discussion
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- Question
Which of the following hydraulic unit is used for transmitting increased or decreased torque to the driven shaft?
Options- A. Hydraulic ram
- B. Hydraulic intensifier
- C. Hydraulic torque converter
- D. Hydraulic accumulator
- Correct Answer
- Hydraulic torque converter
- 1. A Francis turbine is an outward flow reaction turbine.
Options- A. True
- B. False Discuss
- 2. The head available at the inlet of the turbine is known as net or effective head.
Options- A. Correct
- B. Incorrect Discuss
- 3. The Furneyron turbine is __________ reaction turbine.
Options- A. an axial flow
- B. an inward flow
- C. an outward flow
- D. a mixed flow Discuss
- 4. The cavitation in a hydraulic machine is mainly due to
Options- A. low velocity
- B. high velocity
- C. low pressure
- D. high pressure Discuss
- 5. The flow ratio in case of Francis turbine varies from
Options- A. 0.15 to 0.3
- B. 0.4 to 0.5
- C. 0.6 to 0.9
- D. 1 to 1.5 Discuss
- 6. In an axial flow reaction turbine, the water flows __________ to the axis of the wheel.
Options- A. parallel
- B. perpendicular Discuss
- 7. The overall efficiency for a Pelton wheel lies between
Options- A. 0.50 to 0.65
- B. 0.65 to 0.75
- C. 0.75 to 0.85
- D. 0.85 to 0.90 Discuss
- 8. The gross or total head of the turbine is the __________ of the water levels at the head race and tail race.
Options- A. sum
- B. difference
- C. product Discuss
- 9. Which of the following statement is correct?
Options- A. In an impulse turbine, the water impinges on the buckets with pressure energy.
- B. In a reaction turbine, the water glides over the moving vanes with kinetic energy.
- C. In an impulse turbine, the pressure of the flowing water remains unchanged and is equal to atmospheric pressure.
- D. In a reaction turbine, the pressure of the flowing water increases after gliding over the vanes. Discuss
- 10. Braking jet in an impulse turbine is used
Options- A. to break the jet of water
- B. to bring the runner to rest in a short time
- C. to change the direction of runner
- D. none of these Discuss
Hydraulic Machines problems
Search Results
Correct Answer: False
Correct Answer: Correct
Correct Answer: an outward flow
Correct Answer: low pressure
Correct Answer: 0.15 to 0.3
Correct Answer: parallel
Correct Answer: 0.85 to 0.90
Correct Answer: difference
Correct Answer: In an impulse turbine, the pressure of the flowing water remains unchanged and is equal to atmospheric pressure.
Correct Answer: to bring the runner to rest in a short time
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