Top 1000+ Solved Heat Transfer (HT) MCQ Questions Answer
Q. Maximum heat transfer rate can be expected in case of
a. Turbulent flow
b. Co-current flow
c. Laminar flow
d. Counter current flow
e. Heat transfer rate is independent of nature of flow
Q. Which liquid metal is supposed to be the best conductor
a. Zinc
b. Lead
c. Potassium
d. Mercury
e. Sodium
Q. In sugar mills cane juice is evaporated in
a. Long vertical tube evaporators
b. Flash evaporator
c. Horizontal tube evaporators
d. Zig-zag tube evaporator
e. Short vertical tube evaporators
Q. The diathermous body is one that
a. diffuses all the thermal rays in the different directions
b. allows all the incident radiation to pass through it
c. 37,500 kg
d. negligible absorptivity but high reflectivity
e. absorbs all the thermal rays
Q. Dropwise condensation occurs on a
a. Glazed surface
b. Smooth surface
c. Oily surface
d. Coated surface
e. None of the above
Q. The value of reheat factor is of the order of
a. 37,500 kg
b. Less than 1
c. 1.02 to 1.06
d. 1.2 to 1.6
e. More than 2
Q. Heat is transferred by conduction, convection and radiation in
a. Melting of ice
b. Refrigerator freezer coils
c. Boiler furnaces
d. Condensation of steam in a condenser
e. Insulated pipes carrying hot water
Q. Which one of the following materials will have highest value of thermal conductivity?
a. Copper
b. Lead
c. Brass
d. Aluminium
e. Steel
Q. In the temperature of air above a pond is 8?C thermal conductivity of ice is 0.005 C.G.S. units, latent heat of fusion of ice is 79.9 cal/gram the density of ice is 1 gm/cu.m, the time taken for the formation of ice layer of 1 cm thickness is
a. 200 seconds
b. 100 seconds
c. 12.5 seconds
d. 10 seconds
e. None of the above
Q. The temperature reading taken using Centigrade and Fahrenheit thermometers are plotted on a graph -?C along X-axis, ?F along Y-axis. The shape of graph would be
a. Straight line cutting an intercept on the negative Y-axis
b. Straight line cutting an intercept on the positive Y-axis
c. Straight line cutting an intercept on the negative X-axis
d. 273?C
e. Straight line cutting an intercept on the positive X-axis
Q. Agitated film evaporator is suitable for concentrating
a. Insulating liquids
b. Low temperature liquids
c. Viscous liquids
d. Corrosive liquids
e. Liquid metal
Q. Hygrometer is used to measure
a. Convective heat transfer coefficient
b. Heat exchanged due to vapour
c. Density of liquids
d. Relative humidity
e. None of the above