MCQ Questions and Answers on Heat and Mass Transfer

Q.

The heat is transferred in the direction of decreasing temperature is a statement of

A. First law of thermodynamic

B. Second law of thermodynamic

C. Third law of thermodynamic

D. Law of conservation of mass

Answer : Option:- B

Explanation :

As per second second law, Spontaneous processes in nature occurs only in one direction. Heat always flows from body at higher temperature to body at lower temperature.

Q.

If average heat transfer co-efficient is ha and the local coefficient at the end of the plate is 'hl' then in case of heat transfer to a fluid flowing over a flat plate, heated over its entire length

A. ha= hl

B. ha= 2hl

C. ha= 0.5hl

D. ha= 0.75hl

Discuss

Answer : Option:- B

Explanation :

Discuss here! No Explaination Available for These Question.

Q.

For an ideal black body

A. Absorptivity =1

B. Reflectivity =1

C. Emissivity = 0

D. Transmitivity =1

Discuss

Answer : Option:- A

Explanation :

Ideal black body absorb all incident light, therefore absorptivity is equal to 1.

Q.

Nusselt number for full developed, laminar, constant property flow in a pipe at uniform heat flux is

A. 0.72

B. 4.364

C. 18

D. 83

Discuss

Answer : Option:- B

Explanation :

Discuss here! No Explaination Available for These Question.

Q.

Which of the following is concerned with both heat and mass transfer

A. Lewis relationship

B. Nusselt number

C. Kutateladze number

D. Froude number

Discuss

Answer : Option:- A

Explanation :

Lewis relationship is concerned with both heat and mass transfer.

Q.

Radiation shape factor is also known as

A. View factor

B. Friction factor

C. Angle factor

D. None of these

Discuss

Answer : Option:- A

Explanation :

Discuss here! No Explaination Available for These Question.

Q.

According to Reynolds analogy, Stanton number is equal to (where, f = Fanning friction factor)

A. 2f

B. f

C. f/2

D. f/4

Discuss

Answer : Option:- C

Explanation :

The Stanton number represents the ratio of the overall heat transport to the wall to the convective effects in the mainstream.

Q.

The characteristic dimensionless groups for heat transfer to a fluid flowing through a pipe in laminar flow are

A. Re, Gz

B. Nu, Pr

C. Nu, Pr, Re

D. Nu, Gz

Discuss

Answer : Option:- D

Explanation :

Discuss here! No Explaination Available for These Question.

Q.

For flow over a flat plate, the ratio of thermal boundary layer thickness, 'δt' to hydrodynamic boundary layer thickness 'δ' is proportional to (where, NPr = Prandtl number)

A. NPr

B. NPr1/3

C. NPr-1

D. NPr-1/3

Discuss

Answer : Option:- D

Explanation :

Discuss here! No Explaination Available for These Question.

Q.

According to Stefan's Boltzmann law, Emissive power of a black body is

A. Inversely proportional to temperature

B. Directly proportional to temperature

C. Directly proportional to fourth power of its absolute temperature

D. None of these

Discuss

Answer : Option:- C

Explanation :

According to Stefan's Boltzmann law, Emissive power of a black body is directly proportional to fourth power of its absolute temperature.

MCQ Questions and Answers on Heat and Mass Transfer

Q. The heat is transferred in the direction of decreasing temperature is a statement of

Q. If average heat transfer co-efficient is ha and the local coefficient at the end of the plate is 'hl' then in case of heat transfer to a fluid flowing over a flat plate, heated over its entire length

Q. For an ideal black body

Q. Nusselt number for full developed, laminar, constant property flow in a pipe at uniform heat flux is

Q. Which of the following is concerned with both heat and mass transfer

Q. Radiation shape factor is also known as

Q. According to Reynolds analogy, Stanton number is equal to (where, f = Fanning friction factor)

Q. The characteristic dimensionless groups for heat transfer to a fluid flowing through a pipe in laminar flow are

Q. For flow over a flat plate, the ratio of thermal boundary layer thickness, 'δt' to hydrodynamic boundary layer thickness 'δ' is proportional to (where, NPr = Prandtl number)

Q. According to Stefan's Boltzmann law, Emissive power of a black body is

Q.

The heat is transferred in the direction of decreasing temperature is a statement of

Q.

If average heat transfer co-efficient is ha and the local coefficient at the end of the plate is 'hl' then in case of heat transfer to a fluid flowing over a flat plate, heated over its entire length

Q.

For an ideal black body

Q.

Nusselt number for full developed, laminar, constant property flow in a pipe at uniform heat flux is

Q.

Which of the following is concerned with both heat and mass transfer

Q.

Radiation shape factor is also known as

Q.

According to Reynolds analogy, Stanton number is equal to (where, f = Fanning friction factor)

Q.

The characteristic dimensionless groups for heat transfer to a fluid flowing through a pipe in laminar flow are

Q.

For flow over a flat plate, the ratio of thermal boundary layer thickness, 'δt' to hydrodynamic boundary layer thickness 'δ' is proportional to (where, NPr = Prandtl number)

Q.

According to Stefan's Boltzmann law, Emissive power of a black body is