Hydraulic Fluid Mechanics MCQs

Question 1

Separation occurs when

Accepted Answer

The boundary layer comes to rest

Answer

The velocity of sound is reached

Answer

The cross-section of a channel is reduced

Answer

The pressure reaches a minimum

Question 2

The value oi coefficient of velocity compared to coeffpient of discharge

Accepted Answer

Is more

Answer

Is less

Answer

Has no relation

Answer

Is same

Question 3

The hydraulic radius is given by

Accepted Answer

Area divided by wetted perimeter

Answer

Wetted perimeter divided by area

Answer

Area divided by square of wetted perimeter

Answer

Square root of area

Question 4

Pick up the correct statement

Accepted Answer

Nozzle has same accuracy as venturi, but pressure loss is more and the cost is low

Answer

Venturimeter is more accurate than nozzle

Answer

Pressure loss in both is same

Answer

Venturimeter has no restriction on availability of straight length

Question 5

Rotameter is used to measure

Accepted Answer

Flow

Answer

Rotation

Answer

Pressure

Answer

Velocity

Question 6

The most economical section of a trapezoidal channel for maximum discharge is obtained when

Accepted Answer

All of the above

Answer

Hydraulic depth = half of depth

Answer

Half of top width = sloping side

Answer

Length at perpendiculars from centre of top width to bottom and sloping sides are equal

Question 7

When venturimeter is inclined, then for a given flow it will show

Accepted Answer

Same reading

Answer

Less reading

Answer

More reading

Answer

Inaccurate reading

Question 8

One litre of water occupies a volume of

Accepted Answer

1000 cm3

Answer

100 cm3

Answer

250 cm3

Answer

500 cm3

Question 9

A vertical wall is subjected to a pressure due to one kind of liquid, on one of its sides. The total pressure on the wall per unit length is (where w = Specific weight of liquid, and H = Height of liquid)

Accepted Answer

wH2/2

Answer

wH

Answer

wH/2

Answer

wH2/3