Dimensional & Model Analysis PYQs, GPSC Civil Engineering

Kinematic similarity between model and prototype means

A) The similarity of forces

B) The similarity of shape

C) The similarity of motion

D) The similarity of discharge

C) The similarity of motion


Cauchy number is
i. the ratio of inertial force to Elastic force in a flow
ii. the square of Mach number

A) Only (i)

B) Only (ii)

C) Both (i) and (ii)

D) Neither (i) nor (ii)

C) Both (i) and (ii)


In model similarity, if gravitational and inertia forces are the only important forces, then what is the discharge ratio (Note : Lr is the ratio of length dimension)?

A) Lr3/2

B) Lr1/2

C) Lr5/2

D) Lr1/3

C) Lr5/2


Reynolds number may be defined as the ratio of

A) viscous forces to inertial forces

B) inertial forces to viscous forces

C) elastic forces to pressure forces

D) gravity forces to inertial forces

B) inertial forces to viscous forces


The scale effects in models can be

A) Positive only

B) Negative only

C) Both positive and negative

D) None of the above

C) Both positive and negative


Stanton diagram is a

A) log-log plot of friction factor against Reynolds number

B) log-log plot of discharge against Reynolds number

C) log-log plot of friction factor against Euler number

D) log-log plot of discharge against Euler number

A) log-log plot of friction factor against Reynolds number


The gases are considered incompressible when Mach number is

A) equal to 1.0

B) equal to 0.5

C) more than 0.3

D) less than 0.2

D) less than 0.2


The discharge in an open channel is generally measured by

A) Venturimeter

B) Orificemeter

C) Manometer

D) Venturiflume

D) Venturiflume


Euler number is related to

A) Inertia force and pressure force

B) Inertia force and elastic force

C) Inertia force and viscous force

D) Inertia force and gravity force

A) Inertia force and pressure force


The performance of a hydraulic structure during a flood has been investigated in a 1/36 model based on Froude law of similarity. A flood wave passing through the model in 3 hours corresponds to the prototype period of

A) 3 hours

B) 9 hours

C) 18 hours

D) 36 hours

C) 18 hours


Practice Test On Dimensional & Model Analysis PYQs, Fluid Mechanics PYQs (Section 1-1)

GPSC Civil Engineering Previous Year Asked Questions

1 / 10

In model similarity, if gravitational and inertia forces are the only important forces, then what is the discharge ratio (Note : Lr is the ratio of length dimension)?

2 / 10

Reynolds number may be defined as the ratio of

3 / 10

The performance of a hydraulic structure during a flood has been investigated in a 1/36 model based on Froude law of similarity. A flood wave passing through the model in 3 hours corresponds to the prototype period of

4 / 10

The discharge in an open channel is generally measured by

5 / 10

Cauchy number is
i. the ratio of inertial force to Elastic force in a flow
ii. the square of Mach number

6 / 10

Stanton diagram is a

7 / 10

Euler number is related to

8 / 10

The scale effects in models can be

9 / 10

The gases are considered incompressible when Mach number is

10 / 10

Kinematic similarity between model and prototype means

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