If the Francis turbine is run below 50 percent head for a long period, it will n

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Home ‣ Mechanical Engineering ‣ Hydraulic Machines See What Others Are Saying!

Question
If the Francis turbine is run below 50 percent head for a long period, it will not only lose its efficiency but also the cavitation danger will become more serious.
Options
A. Agree
B. Disagree

Correct Answer

Agree

More questions

1. Seam welding is best adopted for metal thickness ranging from
Options
A. 0.025 to 3 mm
B. 3 to 5 mm
C. 5 to 8 mm
D. 8 to 10 mm

Discuss

Correct Answer: 0.025 to 3 mm

2. A spring used to absorb shocks and vibrations is
Options
A. conical spring
B. torsion spring
C. leaf spring
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Correct Answer: leaf spring

3. A manometer can be used to measure vacuum pressures.
Options
A. Agree
B. disagree

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Correct Answer: Agree

4. Cold working of metal increases
Options
A. tensile strength
B. yield strength
C. hardness
D. all of these

Discuss

Correct Answer: all of these

5. The strength of the shaft is judged by the torque transmitted by the shaft.
Options
A. Yes
B. No

Discuss

Correct Answer: Yes

6. The pressure of a liquid measured with the help of a piezometer tube is
Options
A. vacuum pressure
B. gauge pressure
C. absolute pressure
D. atmospheric pressure

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Correct Answer: gauge pressure

7. Workdone by a two-stage reciprocating air compressor per cycle is equal to the workdone in LP. cylinder and H.P. cylinder.
Options
A. True
B. False

Discuss

Correct Answer: True

8. The ratio between two consecutive spindle speeds for a six-speed drilling machine using drills of diameter 6.25 to 25 mm size and at a cutting velocity of 18 m/min is
Options
A. 1.02
B. 1.32
C. 1.66
D. 1.82

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Correct Answer: 1.32

9. Enriched uranium may contain fissionable contents from
Options
A. 1 to 40%
B. 10 to 50%
C. 1 to 80%
D. 1 to 99%

Discuss

Correct Answer: 1 to 99%

10. In aqua-ammonia absorption refrigeration system, incomplete rectification leads to accumulation of water in
Options
A. condenser
B. evaporator
C. absorber
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Discuss

Correct Answer: condenser

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If the Francis turbine is run below 50 percent head for a long period, it will not only lose its efficiency but also the cavitation danger will become more serious.

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