Fluid Mechanics Quiz-1
1.
The fluid property, due to which, mercury does not wet the glass is
A. surface tension
B. viscosity
C. cohesion
D. adhesion
2.
Laminar flow of a Newtonian fluid ceases to exist, when the Reynolds number exceeds
A. 4000
B. 2100
C. 1500
D. 3000
3.
When the momentum of one fluid is used for moving another fluid, such a device is called
a/an
A. jet pump
B. blower
C. acid egg
D. none of these
4.
The normal stress is the same in all directions at a point in a fluid, when the fluid is
A. non-viscous.
B. incompressible.
C. both (a) and (b).
D. having no motion of one fluid layer relative to the other.
5.
Head developed by a centrifugal pump depends on its
A. speed
B. impeller diameter
C. both (a) and (b)
D. neither (a) nor (b)
6.
, Hydraulic mean depth (Dm) for a circular pipe of diameter 'D' flowing full is 0.25 D.
For a circular channel, at Dm = 0.3 D, gives the condition for the maximum
A. flow rate
B. mean velocity
C. both 'a' & 'b'
D. neither 'a' nor 'b'
7.
The head loss in turbulent flow in a pipe varies
A. as velocity
B. as (velocity)2
C. inversely as the square of diameter
D. inversely as the velocity
8.
Most commonly used joint in the underground pipelines is the
A. sleeve joint
B. coupling
C. flange
D. expansion joint
9.
Schedule number of a pipe, which is a measure of its wall thickness, is given by
A. 1000 P'/S
B. 100 P'/S
C. 1000 S/P'
D. 10000 P'/S
10.
The net positive suction head (NPSH) of a centrifugal pump is defined as the sum of
the velocity head and the pressure head at the
A. discharge.
B. suction.
C. suction minus vapour pressure of the liquid at suction temperature.
D. discharge minus vapour pressure of the liquid at the discharge temperature.
11.
With increasing flow rate, the hydraulic efficiency of a centrifugal pump
A. monotonically decreases.
B. decreases and then increases.
C. remains constant.
1.
The fluid property, due to which, mercury does not wet the glass is
A. surface tension
B. viscosity
C. cohesion
D. adhesion
2.
Laminar flow of a Newtonian fluid ceases to exist, when the Reynolds number exceeds
A. 4000
B. 2100
C. 1500
D. 3000
3.
When the momentum of one fluid is used for moving another fluid, such a device is called
a/an
A. jet pump
B. blower
C. acid egg
D. none of these
4.
The normal stress is the same in all directions at a point in a fluid, when the fluid is
A. non-viscous.
B. incompressible.
C. both (a) and (b).
D. having no motion of one fluid layer relative to the other.
5.
Head developed by a centrifugal pump depends on its
A. speed
B. impeller diameter
C. both (a) and (b)
D. neither (a) nor (b)
6.
, Hydraulic mean depth (Dm) for a circular pipe of diameter 'D' flowing full is 0.25 D.
For a circular channel, at Dm = 0.3 D, gives the condition for the maximum
A. flow rate
B. mean velocity
C. both 'a' & 'b'
D. neither 'a' nor 'b'
7.
The head loss in turbulent flow in a pipe varies
A. as velocity
B. as (velocity)2
C. inversely as the square of diameter
D. inversely as the velocity
8.
Most commonly used joint in the underground pipelines is the
A. sleeve joint
B. coupling
C. flange
D. expansion joint
9.
Schedule number of a pipe, which is a measure of its wall thickness, is given by
A. 1000 P'/S
B. 100 P'/S
C. 1000 S/P'
D. 10000 P'/S
10.
The net positive suction head (NPSH) of a centrifugal pump is defined as the sum of
the velocity head and the pressure head at the
A. discharge.
B. suction.
C. suction minus vapour pressure of the liquid at suction temperature.
D. discharge minus vapour pressure of the liquid at the discharge temperature.
11.
With increasing flow rate, the hydraulic efficiency of a centrifugal pump
A. monotonically decreases.
B. decreases and then increases.
C. remains constant.
