Top 1000+ Solved Heat Transfer (HT) MCQ Questions Answer
Q. For a cold dilute feed to produce thick viscous liquor, backward feeding as compared toforward feeding results in
a. Increased economy
b. Decreased economy
c. Lower capacity
d. No effect on economy
Q. Which of the following has the minimum absorptivity?
a. Aluminium foil
b. Coal dust
c. Refractory bricks
d. Iron plates
Q. In a forward feed multiple effect, the pressure build up will be
a. Least at the inlet of the first effect
b. Least at the outlet of the last effect
c. Highest at the inlet of the last effect
d. Highest at the outlet of the last effect
Q. The rate of heat transfer is a product of overall heat transfer co-efficient, the difference in temperature and the
a. Heating volume
b. Heat transfer area
c. Nusselt number
d. None of these
Q. In case of a vertical tube evaporator, with increase in the liquor level, the
a. Capacity of the evaporator is decreased
b. Capacity of the evaporator is increased
c. True temperature drop increases
d. Both (B) and (C)
Q. Which of the following has the minimum thermal conductivity?
a. Nitrogen
b. Steel
c. Carbon black
d. Tar
Q. Low thermal conductivity of heat insulating materials is due to its
a. Dense structure
b. High proportion of air space
c. High specific heat
d. None of these
Q. For an ideal black body
a. Absorptivity = 1
b. Reflectivity = 1
c. Emissivity = 0
d. Transmissivity = 1
Q. For concentrating an aqueous solution of a material like anhydrous Na2SO4, whose solubility decreases with rise in temperature, the most suitable evaporator is a __________ evaporator.
a. High pressure
b. Vacuum
c. Backward feed
d. None of these
Q. Small scale evaporation is done in a
a. Heat exchanger
b. Condenser
c. Multiple effect evaporator
d. Steam jacketed kettle
Q. Leidenfrost point is a term concerned with the
a. Condensation of the saturated vapor on a cold surface
b. Concentration of a corrosive solution by evaporation
c. Heat transfer between two highly viscous liquids
d. Boiling of a liquid on a hot surface
Q. Mode of heat transfer involved in the cooling of air cooled internal combustion engine is
a. Conduction
b. Natural convection
c. Forced convection
d. None of these