Mechanical Engineering - Hydraulics and Fluid Mechanics

36. 

The mercury does not wet the glass. This is due to the property of the liquid known as

A. cohesion
B. adhesion
C. viscosity
D. surface tension

Answer: Option D

Explanation:

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37. 

The coefficient of discharge in case of internal mouthpiece is __________ that of external mouthpiece.

A. less than
B. more than

Answer: Option A

Explanation:

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38. 

The centre of pressure for a vertically immersed surface lies at a distance equal to __________ the centre of gravity.

A. below
B. above
C. below
D. above

Answer: Option A

Explanation:

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39. 

According to Manning's formula, the discharge through an open channel is (where M = Manning's constant)

A. A x M x m1/2 x i2/3
B. A x M x m2/3 x i1/2
C. A1/2 x M2/3 x m x i
D. A2/3 x M1/3 x m x i

Answer: Option B

Explanation:

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40. 

When the venturimeter is inclined, then for a given flow it will show __________ reading.

A. same
B. more
C. less

Answer: Option A

Explanation:

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