Mechanical Engineering - Hydraulics and Fluid Mechanics

Exercise :: Hydraulics and Fluid Mechanics - Section 1
16.
According to equation of continuity,

A.
w _{1} a _{1} = w _{2} a _{2} B.
w _{1} v _{1} = w _{2} v _{2} C.
a _{1} v _{1} = a _{2} v _{2} D.
a _{1} /v _{1} = a _{2} /v _{2}

Answer: Option C

Explanation:

17.
Coefficient of resistance is the ratio of

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

Answer: Option C

Explanation:

18.
Euler's equation in the differential form for the motion of liquids is given by

A.
B.
C.
ρ.dp + g .dz + v .dv = 0 D.
ρ.dp - g .dz + v .dv = 0

Answer: Option A

Explanation:

19.
In order to measure the flow with a venturimeter, it is installed in

A.
horizontal line B.
inclined line with flow upwards C.
inclined line with flow downwards D.
any direction and in any location

Answer: Option D

Explanation:

20.
The discharge through a large rectangular orifice is given by (where H _{1} = Height of the liquid above the top of the orifice, H _{2} = Height of the liquid above the bottom of the orifice, b = Breadth of the orifice, and C_{d} = Coefficient of discharge)

A.
Q = Cd x b 2g (H _{2} - H _{1} )B.
Q = Cd x b 2g (H _{2} ^{1/2} - H _{1} ^{1/2} )C.
Q = Cd x b 2g (H _{2} ^{3/2} - H _{1} ^{3/2} )D.
Q = Cd x b 2g (H _{2} ^{2} - H _{1} ^{2} )

Answer: Option C

Explanation: