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Hydraulics and Fluid Mechanics

Hydraulics and Fluid Mechanics



Viscosity of water in comparison to mercury is ______________________?
0

A. higher
B. lower
C. same
D. higher/lower depending on temperature
E. unpredictable.

The bulk modulus of elasticity __________________?
0

A. has the dimensions of 1/pressure
B. increases with pressure
C. is large when fluid is more compressible
D. is independent of pressure and viscosity
E. is directly proportional to flow.

The value of the coefficient of compressibility for water at ordinary pressure and temperature in kg/cm is equal to _________________?
0

A. 1000
B. 2100
C. 2700
D. 10,000
E. 21,000.

Surface tension _____________________?
0

A. acts in the plane of the interface normal to any line in the surface
B. is also known as capillarity
C. is a function of the curvature of the interface
D. decreases with fall in temperature
E. has no units

A liquid compressed in cylinder has a volume of 0.04 m3 at 50 kg/cm2 and a volume of 0.039 m3 at 150 kg/cm2. The bulk modulus of elasticity of liquid is _________________?
0

A. 400 kg/cm2
B. 4000 kg/cm2
C. 40 x 105 kg/cm2
D. 40 x 106 kg/cm2
E. none of the above

Units of surface tension are_________________?
0

A. energy/unit area
B. distance
C. both of the above
D. it has no units
E. none of the above

Choose the correct relationship_________________?
0

A. specific gravity = gravity x density
B. dynamicviscosity = kinematicviscosity x density
C. gravity = specific gravity x density
D. kinematicviscosity = dynamicviscosity x density
E. hydrostaticforce = surface tension x gravity.

For manometer, a better liquid combination is one having______________?
0

A. higher surface tension
B. lower surface tension
C. surface tension is no criterion
D. high density and viscosity
E. low density and viscosity

Alcohol is used in manometer, because___________________?
0

Choose the wrong statement ?

A. its vapour pressure is low
B. it provides suitable meniscus for the inclined tube
C. its density is less
D. it provides longer length for a given pressure difference
E. it provides accurate readings.

The property of fluid by virtue of which it offers resistance to shear is called____________________?
0

A. surface tension
B. adhesion
C. cohesion
D. viscosity
E. all of the above



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