Top 1000+ Solved Heat Transfer (HT) MCQ Questions Answer
Q. The thermal conductivity of wood depends upon
a. Density
b. Moisture content
c. Temperature
d. All of the above
e. None of the above
Q. In case of natural covection, the Nusselt number is function of
a. Reynolds number
b. Reynolds number and Prandtl number
c. Grashof's number and Prandtl number
d. Weber number and Mach number
e. None of the above
Q. Transient heat flow occurs in
a. Cooling of casting
b. Heating and cooling of buildings due to sun
c. Electric conductors carrying current
d. Melting of ice
e. Insulated pipes carrying superheated steam
Q. If thermal conductivity of aluminium is say 100 units at 0?C, the thermal conductivity at 500?C will be closer to
a. 37,500 kg
b. 100 units
c. 20 units
d. 140 units
e. 50 units
Q. The highest value of thermal conductivity is expected for
a. Solid ice
b. Water
c. Melting ice
d. Steam
e. Boiling water
Q. If the roof of a house is painted with a shiny metallic paint, the temperature inside will
a. Rise
b. Fall
c. Remain unchanged
d. Depends on other factors
e. None of the above
Q. Plank's law of radiation is applicable to
a. Radiation of any kind
b. Temperature radiation
c. Monochromatic radiation
d. Thermal radiation
e. None of the above
Q. Diffusion coefficient of water into air at 26?C is nearly
a. 5.2 cm2/s
b. 2.6 cm2/sec
c. 0.026 cm2/s
d. 2.6 cm2/s
e. 0.26 cm2/s
Q. A wall has two layers A and B, each made of a different material. Both the layers have the same thickness. The thermal conductivity of material of A is twice that of B. Under the thermal equilibrium the temperature difference across the wall is 30?C. The temperature drops in layers A and B will be respectively
a. 15?C and 15?C
b. cannot be predicated
c. 37,500 kg
d. 10?C and 20?C
e. 20?C and 10?C
Q. Hydrogen cannot be liquefied at room temperature because
a. it is a diatomic gas
b. its critical temperature is less than the room temperature
c. 37,500 kg
d. it has low density
e. it has high specific heat
Q. Ablation heat transfer method is used on
a. nuclear war heads
b. submarines
c. 37,500 kg
d. satellites
e. rockets
Q. In case of a body transparent to thermal radiation
a. transmissibility = 0
b. 37,500 kg
c. absorptivity = 1
d. reflectivity = 1
e. absorptivity = reflectivity = 0
Q. The phenomenon of boiling the milk in an open container when milk spills over the vessel is termed as
a. Film boiling
b. Pool boiling
c. Sub-cooled boiling
d. Interface evaporation
e. Nuclear boiling
Q. A hollow sphere with uniform interior temperature and a small hole behaves very nearly as a
a. White body
b. Transparent body
c. Opaque body
d. Black body
e. Grey body