MCQ Questions and Answers on Heat and Mass Transfer

Q.

What is Nusselt number?

A. Cp µ /k

B. hD/k

C. K /Cp µ

D. None of these

Discuss

Answer : Option:- B

Explanation :

Discuss here! No Explaination Available for These Question.

Q.

Heat transfer occurs by natural convection because change in temperature causes difference in

A. viscosity

B. density

C. thermal conductivity

D. heat capacity

Discuss

Answer : Option:- B

Explanation :

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Q.

The Grashoff number is defined as the ratio of the

A. buoyancy to inertial forces

B. buoyancy to viscous forces

C. inertial to viscous forces

D. buoyancy to surface tension forces

Discuss

Answer : Option:- B

Explanation :

The Grashoff number is defined as the ratio of the buoyancy to viscous forces.

Q.

Fluid motion in the natural convection heat transfer between a solid surface and a fluid in contact with it, results from the

A. existence of thermal boundary layer

B. temperature gradient produced due to density difference

C. buoyancy of the bubbles produced at active nucleation site

D. none of these

Discuss

Answer : Option:- D

Explanation :

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Q.

Thermal conductivity of a gas at low density, ______ with increase in temperature.

A. Decreases

B. Increases

C. Remains unchanged

D. May increase or decrease, depends on the gas

Discuss

Answer : Option:- B

Explanation :

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Q.

Slab made up of carbon steel is initially at a temperature of 500°C (Ti) and it is exposed to air at 30°C (Ta). The thickness of the slab is 1 cm (L). What will be the temperature of the slab after one minute (t)? Assume that the convective heat transfer coefficient (h) on the surface of the slab is 40 W/m²K.

A. 0.832

B. 0.899

C. 0.841

D. 0.862

Discuss

Answer : Option:- A

Explanation :

Discuss here! No Explaination Available for These Question.

Q.

A body which absorb all the radiation falling on it regardless of its wavelength or direction is a

A. Black body

B. Gray body

C. White Body

D. None of these

Discuss

Answer : Option:- A

Explanation :

Discuss here! No Explaination Available for These Question.

Q.

The temperatures of two plates connected by a copper rod are maintained at (T1) 500 K and (T2) 350 K. Find the rate of heat transfer through the rod if the diameter (d) of the rod is 15 cm and length (L) is 1.5 m. Assume that the thermal conductivity is 0.4 kW/nK and there is no heat transfer on the surface of the rod.

A. 707 kW

B. 0.707 kW

C. 70.7 kW

D. 0.0707 kW

Discuss

Answer : Option:- B

Explanation :

Discuss here! No Explaination Available for These Question.

Q.

Prandtl and Reynolds analogy are same, when Prandtl number is

A. 0.5

B. 1

C. >2

D. 1.5

Discuss

Answer : Option:- B

Explanation :

Prandtl and Reynolds analogy are same, when Prandtl number is 1.

Q.

The frequency at which the electromagnetic radiation given off by a black body radiator is most intense, is completely determine by the black body's

A. Frequency

B. Size

C. Shape

D. Temperature

Discuss

Answer : Option:- D

Explanation :

Discuss here! No Explaination Available for These Question.

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MCQ Questions and Answers on Heat and Mass Transfer

Q. What is Nusselt number?

Q. Heat transfer occurs by natural convection because change in temperature causes difference in

Q. The Grashoff number is defined as the ratio of the

Q. Fluid motion in the natural convection heat transfer between a solid surface and a fluid in contact with it, results from the

Q. Thermal conductivity of a gas at low density, ______ with increase in temperature.

Q. A body which absorb all the radiation falling on it regardless of its wavelength or direction is a

Q. Prandtl and Reynolds analogy are same, when Prandtl number is

Q. The frequency at which the electromagnetic radiation given off by a black body radiator is most intense, is completely determine by the black body's

Q.

What is Nusselt number?

Q.

Heat transfer occurs by natural convection because change in temperature causes difference in

Q.

The Grashoff number is defined as the ratio of the

Q.

Fluid motion in the natural convection heat transfer between a solid surface and a fluid in contact with it, results from the

Q.

Thermal conductivity of a gas at low density, ______ with increase in temperature.

Q.

A body which absorb all the radiation falling on it regardless of its wavelength or direction is a

Q.

Prandtl and Reynolds analogy are same, when Prandtl number is

Q.

The frequency at which the electromagnetic radiation given off by a black body radiator is most intense, is completely determine by the black body's