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Fluid-mechanics Questions Set 25:

Quiz Mode

What is the condition for incompressible flow?

None of the above

Ma = 1

Ma < 0.3

Ma > 1

Solution:

The compressibility of an ideal fluid is:

zero

unity

infinity

more than that of a real fluid

Solution:

Which of the following cannot be the value of absolute pressure of a fluid at any point?

1.45 bar

– 1 bar

24 bar

Solution:

The universal gas constant is related to which of the following parameters?

Specific heat at constant pressure

Pressure

Reynolds number

Prandtl number

Solution:

Which of the following forces is developed due to resistance to changes in an object's state of motion?

Pressure force

Viscous force

Gravity force

Inertial force

Solution:

What happens to the discharge at critical pressure?

The discharge is at its maximum

The discharge is zero

The discharge is constant

The discharge is at its minimum

Solution:

The dynamic viscosity is 1.4 × 10⁻⁴ N·s/m². The density is 700 kg/m³. What is the kinematic viscosity in m²/s?

2 × 10⁻⁹ m²/s

2 × 10⁻⁸ m²/s

2 × 10⁻⁵ m²/s

2 × 10⁻⁷ m²/s

Solution:

According to the Reynolds transport theorem, which term represents the time rate of change of N within the control volume?

DN(sys)/Dt

d/dt ∫ηρdV(CV)

∫ηρdVn̂dA(CS)

None of these

Solution:

When is a body called a streamlined body?

Surface of the body coincides with the streamlines

Flow is laminar around it

It produces no drag for flow around it

It is symmetrical about the axis along the free stream

Solution:

The continuity equation relates the area and velocity of a fluid flow. If A1, A2, V1, and V2 are the parameters, what is the relationship between the areas A1 and A2?

A1A2/V1V2

A1/A2 = V1/V2

A1/A2 = V2/V1

V1A2 = V2A1

Fluid-mechanics Questions Set 25:

What is the condition for incompressible flow?

Solution:

The compressibility of an ideal fluid is:

Solution:

Which of the following cannot be the value of absolute pressure of a fluid at any point?

Solution:

The universal gas constant is related to which of the following parameters?

Solution:

Which of the following forces is developed due to resistance to changes in an object's state of motion?

Solution:

What happens to the discharge at critical pressure?

Solution:

The dynamic viscosity is 1.4 × 10⁻⁴ N·s/m². The density is 700 kg/m³. What is the kinematic viscosity in m²/s?

Solution:

According to the Reynolds transport theorem, which term represents the time rate of change of N within the control volume?

Solution:

When is a body called a streamlined body?

Solution:

The continuity equation relates the area and velocity of a fluid flow. If A1, A2, V1, and V2 are the parameters, what is the relationship between the areas A1 and A2?

Solution:

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