Hydraulics and Fluid Mechanics - Section 1

Directions to Solve

Hydraulics and Fluid Mechanics - Section 1

1.

The Bernoulli's equation is based on the assumption that

A.	there is no loss of energy of the liquid flowing
B.	the velocity of flow is uniform across any cross-section of the pipe
C.	no force except gravity acts on the fluid
D.	all of the above

Answer: Option D

Explanation:

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2.

In open channels, the specific energy is the

A.	total energy per unit discharge
B.	total energy measured with respect to the datum passing through the bottom of the channel
C.	total energy measured above the horizontal datum
D.	kinetic energy plotted above the free surface of water

Answer: Option B

Explanation:

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3.

The metacentric heights of two floating bodies A and B are 1 m and 1.5 m respectively. Select the correct statement.

A.	The bodies A and B have equal stability
B.	The body A is more stable than body B
C.	The body B is more stable than body A
D.	The bodies A and B are unstable

Answer: Option C

Explanation:

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4.

The centre of buoyancy is the centre of area of the immersed body.

A.	Correct
B.	Incorrect

Answer: Option A

Explanation:

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5.

The weight per unit volume of a liquid at a standard temperature and pressure is called

A.	specific weight
B.	mass density
C.	specific gravity
D.	none of these

Answer: Option A

Explanation:

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6.

In an external mouthpiece, the absolute pressure head at vena contracta is __________ the atmospheric pressure head by an amount equal to 0.89 times the height of the liquid, above the vena contracta.

A.	less than
B.	more than

Answer: Option A

Explanation:

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7.

The power transmitted through a pipe is (where w = Specific weight in N/m³, and Q = Discharge in m³/s)

A.	w x Q x H
B.	w x Q x hf
C.	w x Q (H - hf)
D.	w x Q (H + hf)

Answer: Option C

Explanation:

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8.

The pressure measured with the help of a piezometer tube is in

A.	N/mm2
B.	N/m2
C.	head of liquid
D.	all of these

Answer: Option C

Explanation:

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