Top 1000+ Solved Heat Transfer (HT) MCQ Questions Answer
Q. A fur coat on an animal will help the animal to be
a. Warm in summer
b. Safe in rains
c. Cool in summer
d. Warm in winter
e. Cool in winter
Q. The wagelength of X-rays is
a. 6 to 100000 micron
b. 0.4 to 0.8 micron
c. 0.8 to 400 micron
d. 0.1 to 0.4 micron
e. 0.014 to 0.018 micron
Q. There are two spheres of copper the ratio of their radii being 1 : 3 both at the same temperature. The ration of heat contents will be
a. 1 ; 81
b. 1 ; 9
c. 1 ; 3
d. 1 ; 1
e. 1 ; 27
Q. Which dimensionless number can be used for convective heat transfer?
a. Mach number
b. 37,500 kg
c. Graetz number
d. Froude number
e. Nusselt number
Q. Essential requirement for the transfer of heat from one body to another is
a. Both bodies must be solids
b. Both bodies must be in contact
c. Temperatures of the two bodies must be different
d. One of the bodies must have internal source of heat generation
e. All of the above
Q. A dimensionless heat transfer coefficient which gives a measure of the ratio of the heat transfer rate to the rate at which heat would be conducted within the fluid under a temperature gradient is known as
a. Stanton number
b. Reynolds number
c. Nusselt number
d. Grashoff number
e. Peclet number
Q. If thermal conductivity of a material of wall varies as ko (1 - ?t ). The temperature at the centre of the wall will be
a. Same as in case of constant thermal conductivity
b. More than that in case of constant thermal conductivity
c. Less than that in case of constant thermal conductivity
d. Depends on other factors
e. None of the above
Q. Dynamic similarity is the similarity of
a. Shape
b. Forces
c. Velocities
d. Effective dimensions
e. None of the above
Q. Which of the following is an example of absorption?
a. Extraction of sugarcane juice
b. Dechlorination of water
c. Removal of oil from cake
d. Removal of moisture from gasoline
e. None of the above
Q. The sensible heat of hot industrial gases can be recovered by a
a. Regenerator
b. Recuperator
c. Either of (A) and (B) above
d. None of the above
e. None of the above
Q. For glass wool the thermal conductivity varies from sample to sample because of variations in
a. Structure
b. Composition
c. Density
d. Porosity
e. All of the above
Q. Metals are good conductors of heat because
a. They contain free electrons
b. Their atoms are relatively far apart
c. Their atoms collide frequently
d. They have reflecting surfaces
e. None of the above
Q. Which one of the following cannot be unit of thermal conductivity?
a. Kcal/m-hr?C
b. cal/c,-sec?K
c. BTU/ft-h?F
d. CHU/ft-hr?C
e. Watt / m2 K