Hydraulics and Fluid Mechanics

Question: An orifice is said to be large, if
[A].

the size of orifice is large

[B].

the velocity of flow is large

[C].

the available head of liquid is more than 5 times the height of orifice

[D].

the available head of liquid is less than 5 times the height of orifice

Answer: Option D

Explanation:

No answer description available for this question.

Question: An average value of coefficient of velocity is
[A].

0.62

[B].

0.76

[C].

0.84

[D].

0.97

Answer: Option D

Explanation:

No answer description available for this question.

Question: Coefficient of discharge Cd is equal to (where Cc = Coefficient of contraction, Cv = Coefficient of velocity, and Cr = Coefficient of resistance)
[A].

Cc x Cv

[B].

Cc x Cr

[C].

Cv x Cr

[D].

Cc/Cr

Answer: Option A

Explanation:

No answer description available for this question.

Question: Coefficient of velocity is defined as 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].

actual discharge through an orifice to the theoretical discharge

[D].

none of the above

Answer: Option A

Explanation:

No answer description available for this question.

Question: A jet of water discharging from a 40 mm diameter orifice has a diameter of 32 mm at its vena contracta. The coefficient of contraction is
[A].

0.46

[B].

0.64

[C].

0.78

[D].

0.87

Answer: Option B

Explanation:

No answer description available for this question.

Question: 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:

No answer description available for this question.

Question: Coefficient of contraction is the ratio of
[A].

actual velocity of jet at vena contracta to the theoretical velocity

[B].

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

[C].

actual discharge through an orifice to the theoretical discharge

[D].

area of jet at vena contracta to the area of orifice

Answer: Option D

Explanation:

No answer description available for this question.

Question: If a pitot tube is placed with its nose upstream, downstream or sideways, the reading will be the same in every case.
[A].

True

[B].

False

Answer: Option B

Explanation:

No answer description available for this question.

Question: A pitot tube is used to measure the
[A].

velocity of flow at the required point in a pipe

[B].

pressure difference between two points in a pipe

[C].

total pressure of liquid flowing in a pipe

[D].

discharge through a pipe

Answer: Option A

Explanation:

No answer description available for this question.

Question: 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:

No answer description available for this question.