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, pa = Partial pressure of dry air, and pv = Partial pressure of water vapour)
(A) Pb = pa – pv
(B) Pb = pa + pv
(C) Pb = pa × 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)
- NCERT Solutions Class 11 Physics Chapter 1 : Physical world
- NCERT Solutions Class 11 Physics Chapter 2 : Units And Measurements
- NCERT Solutions Class 11 Physics Chapter 3 : Motion In A Straight Line
- NCERT Solutions Class 11 Physics Chapter 4 : Motion In A Plane
- NCERT Solutions Class 11 Physics Chapter 5 : Laws of Motion
- NCERT Solutions Class 11 Physics Chapter 6 : Work Energy Power
- NCERT Solutions Class 11 Physics Chapter 7 : Rotational-Motion
- NCERT Solutions Class 11 Physics Chapter 8 : Gravitation
- NCERT Solutions Class 11 Physics Chapter 9 : Mechanical Properties of Solids
- NCERT Solutions Class 11 Physics Chapter 10 : Mechanical Properties of Fluids
- NCERT Solutions Class 11 Physics Chapter 11 : Thermal Properties of Matter
- NCERT Solutions Class 11 Physics Chapter 12 : Thermodynamics
- NCERT Solutions Class 11 Physics Chapter 13 : Kinetic Theory
- NCERT Solutions Class 11 Physics Chapter 14 : Oscillations
- NCERT Solutions Class 11 Physics Chapter 15 : Waves
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