Mechanical Engineering - Hydraulics and Fluid Mechanics

11. 

The length AB of a pipe ABC in which the liquid is flowing has diameter (d1) and is suddenly enlarged to diameter (d2) at B which is constant for the length BC. The loss of head due to sudden enlargement is

A.
B.
C.
D.

Answer: Option C

Explanation:

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12. 

Coefficient of contraction is the ratio of

A. actual velocity of jet at vena contracta to the theoretical velocity
B. loss of head in the orifice to the head of water available at the exit of the orifice
C. actual discharge through an orifice to the theoretical discharge
D. area of jet at vena contracta to the area of orifice

Answer: Option D

Explanation:

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13. 

In a free nappe,

A. the pressure below the nappe is atmospheric
B. the pressure below the nappe is negative
C. the pressure above the nappe is atmospheric
D. the pressure above the nappe is negative

Answer: Option A

Explanation:

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14. 

The Reynold's number of a ship is __________ to its velocity and length.

A. directly proportional
B. inversely proportional

Answer: Option A

Explanation:

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15. 

When a tube of smaller diameter is dipped in water, the water rises in the tube due to viscosity of water.

A. True
B. False

Answer: Option B

Explanation:

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