Fluid Mechanics MCQs

Question 1

The discharge co-efficient for an orificemeter does not depend upon the

Accepted Answer

Pipe length

Answer

Ratio of pipe diameter to orifice diameter

Answer

Type of orifice & the Reynolds number

Answer

Pipe diameter

Question 2

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

Accepted Answer

Type of orifice

Answer

Density, viscosity & compressibility of the fluid

Answer

Ratio of pipe diameter to orifice diameter

Answer

Pipe roughness

Question 3

Mercury is an ideal barometric fluid mainly due to its

Accepted Answer

Very low vapor pressure

Answer

High density

Answer

Low compressibility

Answer

Low capillary action

Question 4

The velocity profile for a Bingham plastic fluid flowing (under laminar conditions) in a pipe is

Accepted Answer

Parabolic near the wall and flat in the middle

Answer

Parabolic

Answer

Flat

Answer

Flat near the wall and parabolic in the middle

Question 5

A streamline is a line in flow field,

Accepted Answer

Such that at every point on it, the velocity is tangential to it

Answer

That is traced by all the fluid particles passing through a given point

Answer

Along which a fluid particle travels

Answer

None of these

Question 6

Hot wire anemometer is used to measure the

Accepted Answer

Velocity of gases

Answer

Velocity of liquids

Answer

Temperature of liquids

Answer

Pressure of liquids

Question 7

A pipe is defined as 'hydraulically smooth', if the friction factor

Accepted Answer

For a given Reynolds number remains constant even on further smoothening of the pipe

Answer

Is not a function of Reynolds number

Answer

Is zero irrespective of the Reynolds number

Answer

None of these

Question 8

Higher specific speed (200-500) of a centrifugal pump indicates that the pump is of __________ flow type.

Accepted Answer

Axial

Answer

Radial

Answer

Mixed

Answer

None of these

Question 9

With increase in pump speed, its NPSH requirement

Accepted Answer

Increases

Answer

Decreases

Answer

Remains unaltered

Answer

Can either increase or decrease ; depends on other factors