Fluid Mechanics and Hydraulics Machines (3141906) MCQ

MCQs of Impact of Jet and Hydraulic Turbines

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MCQ No - 1

The force exerted (in newton) by a jet of water impinging normally on a fixed plate is

(A)

\frac{ρ a V}{2}

(B)

ρ a V

(C)

\frac{ρ a V^{2}}{2}

(D)

ρ a V^{2}

D

MCQ No - 2

The force exerted by a jet of water (in a direction normal to flow) impinging on a fixed plate inclined at an angle θ with the jet is

(A)

\frac{ρ a V}{2} \times \sin θ

(B)

ρ a V \times \sin θ

(C)

\frac{ρ a V^{2}}{2} \times \sin 2 θ

(D)

ρ a V^{2} \times \sin θ

C

MCQ No - 3

The force exerted by a jet of water impinging normally on a plate which due to the impact of jet, moves in the direction of jet with velocity u is

(A)

\frac{ρ a (V - u)}{2}

(B)

ρ a (V - u)

(C)

\frac{ρ a {(V - u)}^{2}}{2}

(D)

ρ a {(V - u)}^{2}

D

MCQ No - 4

The ration of the normal force of a jet of water on a plane inclined at an angle of 30° as compared to that when the plate is normal to jet, is

(A)

\frac{1}{\sqrt{2}}

(B)

\frac{1}{2}

(C)

1

(D)

\sqrt{2}

B

MCQ No - 5

A jet of water is striking at the centre of a curved vane moving with a uniform velocity in the direction of the 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

B

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