Discussion
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- Question
A turbine develops 10000 kW under a head of 25 metres at 135 r.p.m. Its specific speed is
Options- A. 175.4 r.p.m.
- B. 215.5 r.p.m.
- C. 241.5 r.p.m.
- D. 275.4 r.p.m
- Correct Answer
- 241.5 r.p.m.
- 1. A Kaplan turbine is preferred for a specific speed of 300 to 1000 r.p.m.
Options- A. Yes
- B. No Discuss
- 2. The specific speed of a turbine is the speed of an imaginary turbine, identical with the given turbine, which
Options- A. delivers unit discharge under unit head
- B. delivers unit discharge under unit speed
- C. develops unit power under unit head
- D. develops unit power under unit speed Discuss
- 3. Which of the following statement is correct?
Options- A. The centrifugal pump is suitable for large discharge and smaller heads.
- B. The centrifugal pump requires less floor area and simple foundation as compared to reciprocating pump.
- C. The efficiency of centrifugal pump is less as compared to reciprocating pump.
- D. all of the above Discuss
- 4. If the net positive suction head (NPSH) requirement for the pump is not satisfied, then
Options- A. no flow will take place
- B. cavitation will be formed
- C. efficiency will be low
- D. excessive power will be consumed Discuss
- 5. The width of the bucket for a Pelton wheel is generally __________ the diameter of jet.
Options- A. double
- B. three times
- C. four times
- D. five times Discuss
- 6. The governing of steam engines keep the engine speed constant according to the changing load conditions
Options- A. Yes
- B. No Discuss
- 7. Lancashire boiler is
Options- A. stationary fire tube boiler
- B. internally fired boiler
- C. horizontal boiler
- D. all of these Discuss
- 8. A device in which some portion of waste heat of flue gases is recovered to heat the air before it passes to the furnace for combustion purpose, is knwon as
Options- A. superheater
- B. air preheater
- C. economiser
- D. injector Discuss
- 9. The efficiency of the plant __________ with the mechanical draught.
Options- A. increases
- B. decreases
- C. remains constant Discuss
- 10. The evaporative capacity of a boiler is defined as the evaporation of 15.653 kg of water per hour from and at 100° C.
Options- A. Yes
- B. No Discuss
Hydraulic Machines problems
Search Results
Correct Answer: Yes
Correct Answer: develops unit power under unit head
Correct Answer: all of the above
Correct Answer: cavitation will be formed
Correct Answer: five times
Correct Answer: Yes
Correct Answer: all of these
Correct Answer: air preheater
Correct Answer: increases
Correct Answer: No
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