MOMENTRA

Question 1

The fluid property, due to which, mercury does not wet the glass is

Answer 1

Surface Tension

Question 2

At very low flow velocities of small particles in a fluid, what causes the wall shear?

Answer 2

Viscosity

Question 3

If momentum transfer is analogous to conductive heat transfer resulting from a temperature gradient where thermal conductivity is the proportionality factor between the heat flux and temperature gradient, what then is the proportionality factor between the momentum flux and the velocity gradient?

Answer 3

Viscosity

Question 4

Which of the following statement/s is/are TRUE?
A: The Reynolds number is a measure of the ratio of inertial forces to viscous forces.
B: A friction factor is a dimensionless wall shear stress.
C: A simple eddy transport model for the turbulent shear stress predicts a constant friction factor.

Answer 4

A, B, C

Question 5

Based in the rheological behavior of fluids, what is the term for some fluids that do not flow at all until a threshold stress level is attained?

Answer 5

Bingham plastics

Question 6

In the process of compressible flow, what is known as the origin of the gas?

A. Reservoir
B. Gas holder
C. Pocket
D. Aquifer

Answer 6

A. Reservoir

Question 7

The viscosity of a gas
a. decreases with increase in temperature
b. increases with increase in temperature
c. is independent of temperature
d. is independent of pressure for very high pressure intensities

Answer 7

b. increases with increase in temperature

Question 8

The dimensionless number that characterizes the flows of fluid in a conduit.
a. Nusselt number b. Peclet number
c. Grashof number d. Reynolds number

Answer 8

d. Reynolds number

Question 9

Turbulent flow generally occurs for cases involving a. viscous fluid
b. very narrow passages for capillary tube
c. very slow motions
d. none of these

Answer 9

d. none of these

Question 10

For an ideal fluid flow, the Reynolds number is
a. 2100 c. zero
b. 100 d. infinity

Answer 10

d. infinity

Question 11

Pipes having diameter 14 inches or more are designated by their
A) outside diameter
B) cross-sectional area
C) schedule number
D) inside diameter

Answer 11

A) outside diameter

Question 12

Most commonly used joint in the underground pipelines is the
A) expansion joint
B) flange
C) coupling
D) sleevejoint

Answer 12

D) sleevejoint

Question 13

Most commonly used joint in the underground pipelines is the
A) expansion joint
B) flange
C) coupling
D) sleevejoint

Question 14

Water hammer in a pipeline results from the

A.Bursting of pipelines due to closure by a valve

B.Rapid pressure change due to a rapid change in the rate of flow

C.Pressure increase due to closure of a valve resulting in decrease in rate of flow

D.None of these

Answer 14

B.Rapid pressure change due to a rapid change in the rate of flow

Question 15

Molten soap mass is transported by a __________ pump.

diaphragm
reciprocating
gear
centrifugal

Answer 15

centrifugal

Question 16

Nominal size of the discharge pipe of a pump is usually __________ the nominal size of the inlet pipe.

A.Smaller than
B.Larger than
C.Same as
D.Twice

Answer 16

A.Smaller than

Question 17

Location of vena-contracta in an orificemeter does not depend upon the

A.Type of orifice
B.Density, viscosity & compressibility of the fluid
C.Ratio of pipe diameter to orifice diameter
D.Pipe roughness

Answer 17

A.Type of orifice

Question 18

High specific speed of a pump implies that, it is a/an __________ pump.

A.Centrifugal
B.Mixed flow
C.Axial flow
D.None of these

Answer 18

C.Axial flow