Top 1000+ Solved Heat Transfer (HT) MCQ Questions Answer
Q. If the bubbles formed on a submerged hot surface get absorbed in the mass of liquid, the process of boiling is termed as
a. Nucleate boiling
b. Film boiling
c. Pool boiling
d. Any of the above
e. None of the above
Q. The rate of radiant energy, which is emitted by a surface at any temperature and in small wavelength is found from the known rate of energy, which under the same condition would be emitted from a black surface by multiplying with the absorptivity. Above enunciation is known as
a. Planck's law
b. Kirchhoff's law
c. Stefan Boltzman law
d. Lambert rule
e. None of the above
Q. A radiation shield should have
a. low reflectivity
b. high reflectivity
c. high emissivity
d. None of the above
e. 37,500 kg
Q. In heat exchanger design, one transfer unit means
a. Condition when the change in temperature of 1?C numerically equals the average driving force.
b. The equivalent length of tubes in case the heat exchange was for a temperature difference of 1?C
c. One fluid exchanging with another fluid of the same chemical composition
d. The section of heat exchanger where heat transfer surface area is one square metre
e. The section of heat exchanger which will cause temperature drop of one degree centigrade
Q. A 1-2 heat exchanger means
a. Single pass on shell side and double pass on tube side
b. Single pass on tube side and double pass on shell side
c. Two tubes of hot fluid pass through one tube of cold tube
d. Single liquid cools two liwuids at different temperatures
e. Two tubes of cold fluid pass through one tube of hot fluid
Q. When a body is in thermal equilibrium with its surroundings, the absorptivity and the emissivity of the body are same. This Law is known as
a. Wein's Law
b. Kirchhoff's law
c. Stefan Boltzmann's law
d. None of the above
e. Nichrome
Q. The process of separation of solutes of different molecular sizes in a liquid solution by use of a sutable membrane is known as
a. Hyper sorption
b. Leaching
c. Adsorption
d. Dialysis
e. Distillation
Q. The propose of using multiple pass heat exchangers is to
a. Increase pressure drop
b. Increase the rate of heat transfer
c. Neutralise viscous friction
d. Reduce pressure drop
e. Reduce fluid flow friction losses
Q. The range of diffusivity of gases in cm2/sec at atmospheric pressure is
a. 10 to 5
b. More than 10
c. 5 to 1
d. Less than 1
e. 1
Q. Four identical copper cubes are painted with different paints. Now if all the cubes are heated to the same temperature and are left in vacuum, which cube will lose heat more rapidly? The colours of the cubes are
a. Pale blue
b. 37,500 kg
c. Shiny black
d. Dull red
e. shiny white
Q. In case of ideal mono-atomic gas, the ratio of specific heats would be
a. 1.4
b. 1.33
c. 1.41
d. 1.67
e. 1
Q. Thermal conductivity of glass wool depends on
a. Composition
b. Density
c. Porosity
d. Structure
e. All of the above
Q. The average value of thermal conductivity for water at 20?C is about
a. 0.13
b. 0.32
c. 0.51
d. None of the above
e. Nichrome
Q. Which one of the following is a very good insulator?
a. A hard wood board
b. A porcelain sheet
c. An asbestos sheet
d. Saw dust
e. None of the above
Q. A device for transferring heat from one fluid to another is known as
a. Lead
b. Heat exchanger
c. Radiation
d. Condenser
e. Evaporator