MCQ Questions Mechanical Engineering Heat Transfer

MCQ heat transfer-4

MCQ Questions Mechanical Engineering Heat Transfer

Take a look at these MCQ Questions Heat Transfer for engineering interview questions and our tips on how to answer them. If you’re applying for an engineering internship, graduate scheme or entry-level job, you’ll face at least one interview as part of an engineering employer’s recruitment process. You may be interviewed by one or more members of the HR team, senior members of the engineering team you’d be joining or a mixture of both. In this section we will study MCQ Questions Mechanical Engineering Heat Transfer. 
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MCQ Questions Mechanical Engineering Heat Transfer - Set - 4

Question 1: 

The heat transfer by conduction through a thick sphere is given by
(A) Q = 2πkr1 r2 (T1 – T2)/ (r2 – r1)

(B) Q = 4πkr1 r2 (T1 – T2)/ (r2 – r1)

(C) Q = 6πkr1 r2 (T1 – T2)/ (r2 – r1)

(D) Q = 8πkr1 r2 (T1 – T2)/ (r2 – r1)

Correct Answer – (B)

Question 2 : 

According to Dalton’s law of partial pressures, (where pb = Barometric pressure, p= Partial pressure of dry air, and pv = Partial pressure of water vapour)

(A) Pb pa – pv

(B) Pb pa pv

(C) Pb = p× pv

(D) Pb pa/pv

Correct Answer – (B)

Question 3 : 

In free convection heat transfer transition from laminar to turbulent flow is governed by the critical value of the

(A) Reynold’s number

(B) Grashoff’s number

(C) Reynold’s number, Grashoff’s number

(D) Prandtl number, Grashoff’s number

Correct Answer – (D)

Question 4 : 

Which of the following statement is wrong?
(A) The heat transfer in liquid and gases takes place according to convection

(B) The amount of heat flow through a body is dependent upon the material of the body

(C) The thermal conductivity of solid metals increases with rise in temperature

(D) Logarithmic mean temperature difference is not equal to the arithmetic mean temperature difference

Correct Answer – (C)

Question 5 : 

Thermal diffusivity is a
(A) Function of temperature

(B) Physical property of a substance

(C) Dimensionless parameter

(D) All of these

 

Correct Answer – (B)

MCQ Questions Mechanical Engineering Heat Transfer

Question 6: 

Heat transfer takes place as per

(A) Zeroth law of thermodynamics

(B) First law of thermodynamic

(C) Second law of the thermodynamics

(D) Kirchoff’s law

Correct Answer – (C)

Question 7: 

Thermal conductivity of non-metallic amorphous solids with decrease in temperature

(A) Increases

(B) Decreases

(C) Remain constant

(D) May increase or decrease depending on temperature

Correct Answer – (B)

Question 8: 

Thermal conductivity of solid metals with rise in temperature normally

(A) Increases

(B) Decreases

(C) Remain constant

(D) May increase or decrease depending on temperature

Correct Answer – (B)

Question 9: 

Unit of thermal conductivity in S.I. units is
(A) J/m² sec

(B) J/m °K sec

(C) W/m °K

(D) Option (B) and (C) above.

Correct Answer – (D)

Question 10: 

Unit of thermal conductivity in M.K.S. units is

(A) K cal/kg m² °C

(B) K cal m/hr m² °C

(C) K cal/hr m² °C

(D) K calm/hr °C

Correct Answer – (B)

MCQ Questions Mechanical Engineering Heat Transfer
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