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Hydraulics and Fluid Mechanics problems
1. Venturimeter is used to
Options
A. measure the velocity of a flowing liquid
B. measure the pressure of a flowing liquid
C. measure the discharge of liquid flowing in a pipe
D. measure the pressure difference of liquid flowing between two points in a pipe line
Show Answer
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Discuss
Correct Answer: measure the discharge of liquid flowing in a pipe
2. According to Francis formula, the discharge over a rectangular weir is (where
n
= Number of end contractions)
Options
A.
Cd
(
L
-
nH
)
2
gH
B.
Cd
(
L
- 0.1
nH
)
2
g
H
3/2
C.
Cd
(
L
-
nH
)
2
g
H
2
D.
Cd
(
L
- 0.2
nH
)
2
g
H
5/2
Show Answer
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Discuss
Correct Answer:
Cd
(
L
- 0.1
nH
)
2
g
H
3/2
3. The dynamic viscosity of gases __________ with rise in temperature.
Options
A. remain unaffected
B. increases
C. decreases
Show Answer
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Correct Answer: increases
4. According to Newton's law of viscosity, the shear stress on a layer of a fluid is __________ to the rate of shear strain.
Options
A. equal to
B. directly proportional
C. inversely proportional
Show Answer
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Discuss
Correct Answer: directly proportional
5. Bernoulli's equation is applied to
Options
A. venturimeter
B. orifice meter
C. pitot tube
D. all of these
Show Answer
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Discuss
Correct Answer: all of these
6. The velocity at which the turbulent flow starts is known as higher critical velocity.
Options
A. Yes
B. No
Show Answer
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Discuss
Correct Answer: Yes
7. The property of a liquid which enables it to resist tensile stress is called its surface tension.
Options
A. Agree
B. Disagree
Show Answer
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Discuss
Correct Answer: Agree
8. The discharge through a channel of rectangular section will be maximum, if
Options
A. its depth is twice the breadth
B. its breadth is twice the depth
C. its depth is thrice the breadth
D. its breadth is thrice the depth
Show Answer
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Discuss
Correct Answer: its breadth is twice the depth
9. A hemispherical tank of radius (
R
) containing liquid upto height (
H
1
) has an orifice of cross-sectional area (
a
) at its bottom. The time required to lower the level of liquid from (
H
1
) to (
H
2
) will be
Options
A.
B.
C.
D. none of the above
Show Answer
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Correct Answer:
10. The coefficient of venturifiume, generally, lies between
Options
A. 0.3 to 0.45
B. 0.50 to 0.75
C. 0.75 to 0.95
D. 0.95 to 1.0
Show Answer
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Discuss
Correct Answer: 0.95 to 1.0
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More in Mechanical Engineering:
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Compressors, Gas Dynamics and Gas Turbines
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Engineering Mechanics
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Hydraulics and Fluid Mechanics
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Workshop Technology
Cd(L - nH)
