Fluid Mechanics & Gas Dynamics Mock Test

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Fluid Mechanics & Gas Dynamics Mock Test - II

This Test series useful for who are preparing for various technical examinations like TRB Mechanical, TNEB-AE, TNPSC-AE, SSC-JE, NLC GET, GATE, ESE and State PSC and entrance exams like TANCET.

The velocity components in ‘x’ and ‘y’ directions of a 2-D potential flow are ‘u’ and ‘v’ respectively then ∂u/∂x is equal to

1 point

-∂v/∂x

∂v/∂y

∂v/∂x

-∂v/∂y

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Fully developed flow is

1 point

Unchanging velocity distribution

Changing velocity distribution

Change in density

No change In density

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Consider the following energies connected with a pelton turbine:

2 points

I, II, III

II, III, I

III, II, I

I, III, II

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Which of the following statements is CORRECT with respect to Hydraulic Jump in channels?

1 point

Sudden and turbulent passage of water from supercritical state to subcritical state

Slow and non-turbulent passage of water from subcritical state to supercritical state

Sudden and turbulent passage of water from subcritical state to supercritical state

Slow and non-turbulent passage of water from supercritical state to subcritical state

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Terminal Velocity is

1 point

Velocity of sound on the fluid

A fluctuating velocity

Attained after moving one- half of the total distance

A constant velocity with no acceleration

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Fan is a machine used to impart ______ to a flowing gas.

1 point

Large increase of pressure

Small increase of pressure

Large increase of velocity

Small increase of velocity

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A pipe having cross-sectional area of 80 cm2 at section ‘P’ has a velocity U1 = 10 cm/s. If the pipe converges with velocity U2 = 20 cm/s at a section ‘Q’, then what will be the cross sectional area at section ‘Q’?

1 point

120 cm^2

60 cm^2

40 cm^2

160 cm^2

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Which of the following options represents "Vena Contracta" of a fluid flow through an orifice meter?

1 point

Minimum cross section of the fluid jet

Maximum diameter compared to orifice diameter

Minimum velocity of fluid flow

Minimum fluid mass flow rate

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Which among the following options CORRECTLY represents the Specific Volume of a fluid?

1 point

It is the reciprocal of viscosity

It is the reciprocal of specific gravity

It is the reciprocal of specific weight

It is the reciprocal of mass density

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Identify the correct relationship between bulk modulus of elasticity (K) and coefficient of compressibility (β)

1 point

K=1.4/β

K=1/β^2

K= 1/β

K= β^2

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Which instrument is used to measure velocity of flow by converting kinetic energy into pressure energy?

1 point

Pitot tube

Venturi meter

Flow nozzle

Orifice meter

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Which of the following denotes the effect of compressibility in fluid flow?

1 point

Reynolds number

Euler Number

Mach Number

Weber Number

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The continuity equation of differential form for compressible flow is

1 point

dA/A+ dV/V+dρ/ρ=constant

dA/A+ dV/V+dρ/ρ=0

AdA+VdV+ ρdρ=constant

AdA+VdV+ ρdρ=0

Clear selection

Which of the following statements is Correct?

2 points

1, 2, 3 is correct and 4 is incorrect.

1, 2 is correct 3,4 is incorrect.

1, 2 ,3 is incorrect and 4 is correct.

1,3 is correct and 2, 4 is incorrect

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Pressure drop of water in a pipe is measured by a manometer using a liquid of density 2000 kg/m3. The difference in height of liquid in the limbs is 10 cm. Then the pressure drop is

2 points

1962 N/m^2

98.1 N/cm^2

98.1 N/m^2

1962 N/cm^2

Clear selection

Reynolds number for water flow through a tube of inner dia. 5 cm is 1500. If a liquid of 8 centipoise viscosity and 0.85 specific gravity flows in the same pipe at the same velocity, then the pressure drop will

1 point

Decrease

Remain same

Increase

Be unpredictable

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On Rayleigh curve at maximum entropy and enthalpy the Mach number values are (where γ – specific heat ratio)

1 point

1 and 1

γ and √γ

1and 1/√γ

1/√γ and 1

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In thixotropic fluid viscosity ______ with time

1 point

Decrease

Increase

No Change

Increase and then decrease

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The power law model for Non-Newtonian fluids is given by τ=k(du/dy)^n What is the value of ‘n’ for dilatant fluids?

1 point

Less than 1

Equal to 1

More than 1

None of the above

Clear selection

If an aeroplane goes to higher altitudes maintaining the same speed, the Mach number will ________ only

1 point

May increase or decrease, it depends on state of total conditions

Remain same

Decrease

Increase

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Diabatic flow is also called as

1 point

Fanno flow

Rayleigh flow

Variable flow

Shock free flow

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Match the List – I (Section of Channel) with List – II (Most Economical Condition)Where Hydraulic radius – m; Depth of flow – d

2 points

A – 1; B – 4; C – 5; D – 2

A – 5; B – 4; C – 2; D - 1

A – 1; B – 2; C – 3; D – 4

A – 2; B – 2; C – 4; D – 5

Clear selection

A smooth rectangular duct of size 10 x 20 cm is used for transporting air. The hydraulic radius is

1 point

0.033 cm

3.33 cm

0.66 cm

0.33 cm

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Consider the following statements:Assertion (A): An inverted U – Tube manometer is more sensitive than a vertical upright U – Tube manometer.Reason(R): Since a lighter liquid is used in inverted U – Tube manometer the accuracy of reading is less.

2 points

(A) is true but (R) is not the correct explanation for (A)

Both (A) and (R) are true

Both (A) and (R) is False

(A) is true and (R) is the correct explanation

Clear selection

For a fully developed flow, relationship between transition length and Re for laminar flow is Where x_t – transition length; D – diameter of pipe; Re – Reynolds number

1 point

x_t⁄D=Re

x_t⁄D=0.005Re

x_t⁄D=0.05Re

x_t⁄D=0.5Re

Clear selection

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