Mechanical Engineering

In a reaction turbine, the draft tube is used

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Question: In a reaction turbine, the draft tube is used
[A].

to run the turbine full

[B].

to prevent air to enter the turbine

[C].

to increase the head of water by an amount equal to the height of the runner outlet above the tail race

[D].

to transport water to downstream

Answer: Option C

Explanation:

No answer description available for this question.

In a reaction turbine, the pressure head of water, while flowing over the vanes, is converted into kinetic head before leaving the wheel.

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Question: In a reaction turbine, the pressure head of water, while flowing over the vanes, is converted into kinetic head before leaving the wheel.
[A].

Agree

[B].

Disagree

Answer: Option B

Explanation:

No answer description available for this question.

If Hg is the gross or total head and hf is the head lost due to friction, then net or effective head (H) is given by

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Question: If Hg is the gross or total head and hf is the head lost due to friction, then net or effective head (H) is given by
[A].

H = Hg/hf

[B].

H = Hg x hf

[C].

H = Hg + hf

[D].

H = Hg – hf

Answer: Option D

Explanation:

No answer description available for this question.

In an impulse turbine, the jet of water impinges on the bucket with a low velocity and after flowing over the vanes, leaves with a high velocity.

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Question: In an impulse turbine, the jet of water impinges on the bucket with a low velocity and after flowing over the vanes, leaves with a high velocity.
[A].

True

[B].

False

Answer: Option B

Explanation:

No answer description available for this question.