Mechanical Engineering

Question: Which of the following statement is correct as regard to water wheels?
[A].

They have slow speeds.

[B].

They are suitable even for low water heads.

[C].

They give constant efficiency, even if the discharge is not constant

[D].

all of the above

Answer: Option D

Explanation:

No answer description available for this question.

Question: The breast water wheels are those in which the wheel runs partly by the weight of water and partly by the impulse of water.
[A].

True

[B].

False

Answer: Option A

Explanation:

No answer description available for this question.

Question: A ship with jet propulsion draws water through inlet orifices at right angles to the direction of its motion. The propelling force of the jet is (where a = Area of the jet, Vr = Relative velocity of the jet and ship = V + v, v = Velocity of the ship, and V = Velocity of the jet issuing from the ship)
[A].

[B].

[C].

[D].

Answer: Option B

Explanation:

No answer description available for this question.

Question: A jet of water is striking at the centre of a curved vane moving with a uniform velocity in the direction of jet. For the maximum efficiency, the vane velocity is __________ of the jet velocity
[A].

one-half

[B].

one-third

[C].

two-third

[D].

three-fourth

Answer: Option B

Explanation:

No answer description available for this question.

Question: A jet of water enters and leaves a fixed curved vane tangentially. The force of the jet along normal to the vane is (where α and β = Inlet and outlet angles of the jet respectively)
[A].

[B].

[C].

[D].

Answer: Option A

Explanation:

No answer description available for this question.

Question: A jet of water enters and leaves a fixed curved vane tangentially. The force of jet along perpendicular to the vane is zero.
[A].

True

[B].

False

Answer: Option B

Explanation:

No answer description available for this question.