Hydraulic Fluid Mechanics MCQs

Question 1

According to equation of continuity,

Accepted Answer

a1v1 = a2v2

Answer

w1a1 = w2a2

Answer

w1v1 = w2v2

Answer

a1/v1 = a2/v2

Question 2

Coefficient of resistance is the ratio of

Accepted Answer

Loss of head in the orifice to the head of water available at the exit of the orifice

Answer

Actual velocity of jet at vena contracta to the theoretical velocity

Answer

Area of jet at vena contracta to the area of orifice

Answer

Actual discharge through an orifice to the dieoretical discharge

Question 3

The maximum discharge over a broad crested weir is

Accepted Answer

1.71 Cd x L x H3/2

Answer

0.384 Cd x L x H1/2

Answer

0.384 Cd x L x H3/2

Answer

1.71 Cd x L x H1/2

Question 4

The loss of head due to friction in a pipe of uniform diameter in which a viscous flow is taking place, is (where RN = Reynold number)

Accepted Answer

16/RN

Answer

1/RN

Answer

4/RN

Answer

64/RN

Question 5

Which of the following is an example of laminar flow?

Accepted Answer

all of these

Answer

Under ground flow

Answer

Flow past tiny bodies

Answer

Flow of oil in measuring instruments

Question 6

A manometer is used to measure

Accepted Answer

high pressure

Answer

low pressure

Answer

moderate pressure

Answer

atomospheric pressure

Question 7

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

Accepted Answer

w x Q (H - hf)

Answer

w x Q x H

Answer

w x Q x hf

Answer

w x Q (H + hf)

Question 8

A water tank contains 1.3 m deep water. The pressure exerted by the water per metre length of the tank is

Accepted Answer

8.29 kN

Answer

2.89 kN

Answer

9.28 kN

Answer

28.9 kN

Question 9

The Francis formula for the discharge over Cippoletti weir is

Accepted Answer

1.84 LH3/2

Answer

1.84 LH1/2

Answer

1.84 LH

Answer

1.84 LH5/2