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Mechanical Engineering
‣
Hydraulics and Fluid Mechanics
Comments
Question
The specific weight is also known as weight density.
Options
A. Correct
B. Incorrect
Correct Answer
Correct
Hydraulics and Fluid Mechanics problems
Search Results
1. When the venturimeter is inclined, then for a given flow it will show __________ reading.
Options
A. same
B. more
C. less
Show Answer
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Discuss
Correct Answer: same
2. A flow is called super-sonic if the
Options
A. velocity of flow is very high
B. discharge is difficult to measure
C. Mach number is between 1and 6
D. none of these
Show Answer
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Discuss
Correct Answer: Mach number is between 1and 6
3. In a sharp-crested weir, the thickness of the weir is kept less than half of the height of water above the crest of the weir.
Options
A. True
B. False
Show Answer
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Correct Answer: True
4. The property of a liquid which offers resistance to the movement of one layer of liquid over another adjacent layer of liquid, is called
Options
A. surface tension
B. compressibility
C. capillarity
D. viscosity
Show Answer
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Discuss
Correct Answer: viscosity
5. Newton's law of viscosity is a relationship between
Options
A. pressure, velocity and temperature
B. shear stress and rate of shear strain
C. shear stress and velocity
D. rate of shear strain and temperature
Show Answer
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Discuss
Correct Answer: shear stress and rate of shear strain
6. The specific weight of compressible fluids does not remain constant.
Options
A. True
B. False
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Correct Answer: True
7. The discharge over the trapezoidal notch is equal to the discharge over the rectangular notch __________ the discharge over the triangular notch.
Options
A. plus
B. minus
Show Answer
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Correct Answer: plus
8. A flow in which the quantity of liquid flowing per second is constant, is called __________ flow.
Options
A. steady
B. streamline
C. turbulent
D. unsteady
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Discuss
Correct Answer: steady
9. 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
10. 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
Scratch Pad
Discuss
Correct Answer:
Cd
(
L
- 0.1
nH
)
2
g
H
3/2
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