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 - 5

Question 1:

In heat exchangers, degree of approach is defined as the difference between temperatures of

(a) cold water inlet and outlet

(b) hot medium inlet and outlet

(d) hot medium outlet and cold water outlet

Check Answer

Correct Answer – (D)

Question 2 :

A non-dimensional number generally associated with natural convection heat transfer is

(a) Grashoff number

(b) Nusselt number

(d) Prandtl number

Check Answer

Correct Answer – (A)

Question 3 :

A grey body is one whose absorptivity

(a) varies with temperature

(b) varies with wavelength of the incident ray

(d) does not vary with temperature and. wavelength of the incident ray

Check Answer

Correct Answer – (C)

Question 4 :

Reynolds number (R_N) is given by (where h = Film coefficient, l = Linear dimension, V = Velocity of fluid, k = Thermal conductivity, t = Temperature, ρ = Density of fluid, c_p = Specific heat at constant pressure, and μ = Coefficient of absolute viscosity)

(A) R_N = hl/k

(B) R_N = μ c_p/k

(D) R_N = V²/t.c_p

Check Answer

Correct Answer – (C)

Question 5 :

Fourier’s law of heat conduction is (where Q = Amount of heat flow through the body in unit time, A = Surface area of heat flow, taken at right angles to the direction of heat flow, dT = Temperature difference on the two faces of the body, dx = Thickness of the body, through which the heat flows, taken along the direction of heat flow, and k = Thermal conductivity of the body)

(A) k. A. (dT/dx)

(B) k. A. (dx/dT)

(D) k. (dx/dT)

Check Answer

Correct Answer – (A)

MCQ Questions Mechanical Engineering Heat Transfer

Question 6:

LMTD in case of counter flow heat exchanger as compared-to parallel flow heat exchanger is

(a) higher

(b) lower

(d) depends on the area of heat exchanger

Check Answer

Correct Answer – (A)

Question 7:

Two balls of same material and finish have their diameters in the ratio of 2 : 1 and both are heated to same temperature and allowed to cool by radiation. Rate of cooling by big ball as compared to smaller one will be in the ratio of

(a) 1 :1

(b) 2: 1

(d) 4 : 1

Check Answer

Correct Answer – (C)

Question 8:

Sensible heat is the heat required to

(A) Change vapour into liquid

(B) Change liquid into vapour

(D) Convert water into steam and superheat it

Check Answer

Correct Answer – (C)

Question 9:

When heat is transferred from hot body to cold body, in a straight line, without affecting the intervening medium, it is referred as heat transfer by

(A) Conduction

(B) Convection(

C) Radiation

(D) Conduction and convection

Check Answer

Correct Answer – (C)

Question 10:

When heat is transferred from one particle of hot body to another by actual motion of the heated particles, it is referred to as heat transfer by

(A) Conduction

(B) Convection

(D) Conduction and convection

Check Answer

Correct Answer – (A)

MCQ Questions Mechanical Engineering Heat Transfer

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