Top 1000+ Solved Heat Transfer (HT) MCQ Questions Answer
Q. Floating heads are provided in heat exchangers to
a. Facilitate maintenance
b. Regulate the flow
c. Increase the pressure drop
d. Avoid deformation of tubes due to thermal expansion
e. Reduce the pressure drop
Q. The transfer of heat in case of radiation takes place by means of
a. Heated particles of the medium
b. Electromagnetic waves
c. Thermal energy of the source
d. None of the above
e. 37,500 kg
Q. In case of liquids and gases, the heat transfer takes place according to
a. radiation
b. conduction
c. convection
d. Both (A) and (C)
e. Nichrome
Q. Which of the following has the highest value of the thermal conductivity
a. Wood
b. Asbestos
c. Nichrome
d. Clay
e. Refractory brick
Q. Which of the following is wrong
a. Black surfaces are better absorbers than white ones
b. Black surfaces are better radiators than white ones
c. Rough surfaces are better radiators than smooth surfaces
d. 37,500 kg
e. Highly polished mirror like surfaces are very good radiators
Q. Which of the following are generally diathermanous?
a. Solids
b. Liquids
c. Gases
d. All of the above
e. 37,500 kg
Q. All bodies above absolute zero temperature emit radiation". Above statement is based on
a. D'Alambert's rule
b. Wein's law
c. Stefan law
d. Planck's law
e. Prevost theory
Q. Which one of the following will radiate heat to a large extent?
a. White polished surface
b. White rough surface
c. Black rough surface
d. Black polished surface
e. None of the above
Q. In a cooling tower which mode of heat transfer plays insignificant role?
a. Evaporative cooling
b. Convective cooling
c. Radiaion
d. All of the above
e. 37,500 kg
Q. A dimensionless number which is the ratio of kinematic viscosity to thermal diffusivity is known as
a. Grashoff number
b. Reynolds number
c. Prandtl number
d. Pacelet number
e. Nusselt number
Q. Formation of fog is due to
a. High pressure
b. Humidity
c. Temperature fall of atmosphere
d. Low pressure
e. Night showers
Q. The radiation from flames consists of
a. Continuous radiation from burning soot particles of microscopic and submicroscopic dimensions
b. Radiation from suspended larger particles of coal, coke or ash contributing to flame luminosity
c. Infrared radiation from water vapour and carboundioxide
d. Non-equilibrium radiation associated with the combustion process
e. All of the above
Q. In a shell and tube heat exchanger, the corrosive liquid is normally passed through
a. Shell side
b. Tube side
c. Either of (A) and (B) above
d. None of the above
e. None of the above