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Mechanical Engineering
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Hydraulics and Fluid Mechanics
Comments
Question
The pressure intensity in kN/m
2
(or kPa) at any point in a liquid is (where
w
= Specific weight of liquid, and
h
= Depth of liquid from the surface)
Options
A.
w
B.
wh
C.
w
/
h
D.
h
/
w
Correct Answer
wh
Hydraulics and Fluid Mechanics problems
Search Results
1. 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
Options
A. 0.46
B. 0.64
C. 0.78
D. 0.87
Show Answer
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Discuss
Correct Answer: 0.64
2. Reynold's number is the ratio of the inertia force to the
Options
A. surface tension force
B. viscous force
C. gravity force
D. elastic force
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Correct Answer: viscous force
3. A flow is called hyper-sonic, if the Mach number is
Options
A. less than unity
B. unity
C. between 1 and 6
D. none of these
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Correct Answer: none of these
4. The velocity at which the flow changes from laminar flow to turbulent flow is called
Options
A. critical velocity
B. velocity of approach
C. sub-sonic velocity
D. super-sonic velocity
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Correct Answer: critical velocity
5. The pressure measured with the help of a pressure gauge is called
Options
A. atmospheric pressure
B. gauge pressure
C. absolute pressure
D. mean pressure
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Discuss
Correct Answer: gauge pressure
6. The discharge over a rectangular notch is
Options
A. inversely proportional to
H
3/2
B. directly proportional to
H
3/2
C. inversely proportional to
H
5/2
D. directly proportional to
H
5/2
Show Answer
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Correct Answer: directly proportional to
H
3/2
7. A glass tube of small diameter (
d
) is dipped in fluid. The height of rise or fall in the tube given by (where
w
= Specific weight of liquid, ? = Angle of contact of the liquid surface, and ? = Surface tension)
Options
A.
B.
C.
D.
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Correct Answer:
8. The vacuum pressure can be measured with the help of a piezometer tube.
Options
A. True
B. False
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Correct Answer: False
9. According to Bazin, the coefficient of discharge varies with the height of water over the sill of a weir.
Options
A. Correct
B. Incorrect
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Correct Answer: Correct
10. The kinematic viscosity of an oil (in stokes) whose specific gravity is 0.95 and viscosity 0.011 poise, is
Options
A. 0.0116 stoke
B. 0.116 stoke
C. 0.0611 stoke
D. 0.611 stoke
Show Answer
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Discuss
Correct Answer: 0.0116 stoke
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