Hydraulic Machines

Question: A Francis turbine is used when the available head of water is
[A].

0 to 25 m

[B].

25 m to 250 m

[C].

above 250 m

[D].

none of these

Answer: Option B

Explanation:

No answer description available for this question.

Question: Which of the following turbine is preferred for 0 to 25 m head of water?
[A].

Pelton wheel

[B].

Kaplan turbine

[C].

Francis turbine

[D].

none of these

Answer: Option B

Explanation:

No answer description available for this question.

Question: A Kaplan turbine is preferred for a specific speed of 300 to 1000 r.p.m.
[A].

Yes

[B].

No

Answer: Option A

Explanation:

No answer description available for this question.

Question: Which of the following turbine is preferred for a specific speed of 60 to 300 r.p.m.?
[A].

Pelton wheel

[B].

Francis turbine

[C].

Kaplan turbine

[D].

none of these

Answer: Option B

Explanation:

No answer description available for this question.

Question: A turbine develops 10000 kW under a head of 25 metres at 135 r.p.m. Its specific speed is
[A].

175.4 r.p.m.

[B].

215.5 r.p.m.

[C].

241.5 r.p.m.

[D].

275.4 r.p.m

Answer: Option C

Explanation:

No answer description available for this question.

Question: A Pelton wheel develops 1750 kW under a head of 100 metres while running at 200 r.p.m. and discharging 2500 litres of water per second. The unit discharge of wheel is
[A].

0.25 m3/s

[B].

0.5 m3/s

[C].

1.5 m3/s

[D].

2.5 m3/s

Answer: Option A

Explanation:

No answer description available for this question.

Question: A Pelton wheel develops 1750 kW under a head of 100 metres while running at 200 r.p.m. and discharging 2500 litres of water per second. The unit speed of the wheel is
[A].

10 r.p.m.

[B].

20 r.p.m.

[C].

40 r.p.m.

[D].

80 r.p.m.

Answer: Option B

Explanation:

No answer description available for this question.

Question: A Pelton wheel develops 1750 kW under a head of 100 metres while running at 200 r.p.m. and discharging 2500 litres of water per second. The unit power of the wheel is
[A].

0.25 kW

[B].

0.75 kW

[C].

1.75 kW

[D].

3.75 kW

Answer: Option C

Explanation:

No answer description available for this question.

Question: A Pelton wheel with one nozzle is preferred for a specific speed between 35 to 60 r.p.m.
[A].

True

[B].

False

Answer: Option B

Explanation:

No answer description available for this question.

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.
[A].

Agree

[B].

Disagree

Answer: Option A

Explanation:

No answer description available for this question.