Top 1000+ Solved Heat Transfer (HT) MCQ Questions Answer
Q. What energy transformation takes place when ice and salt mixture is converted into water
a. Heat energy to sensible heat
b. Kinetic energy to heat energy
c. Heat energy to latent heat
d. Heat energy to potential energy
e. Heat energy to kinetic energy
Q. The rate of energy stored in the wall will be
a. 50 kcal/sec
b. 50 kcal/min
c. 200 kcal/min
d. 50 kcal/hr
e. 200 kcal/hr
Q. Pyrometer which react to all wavelengths of incident radiant energy are known as
a. Multicolour pyrometers
b. Total radiation pyrometers
c. Polarising pyrometers
d. Optical pyrometers
e. Ddisappearing filament type pyrometers
Q. A relationship between the temperature of a black body and the wavelength at which the maximum value of monochromatic emission power occurs, is established under
a. D' lambert's rule
b. Stefan-Bolzmann's law
c. Planck's law
d. Wein's displacement law
e. Kirchhoff's law
Q. In case of white body, absorptivity is
a. Between 0 to 0.5
b. 1
c. Zero
d. More than 0.5
e. 37,500 kg
Q. The overall co-efficients of heat transfer is used in the problems of
a. convection
b. conduction
c. radiation
d. conduction and convection
e. Nichrome
Q. Identity the correct statement
a. Only some substances emit radiation
b. A substance will emit radiation at a particular wavelength only
c. Quality and quantity of radiation depends on the properties of the material only
d. All substances emit radiation the quality and quantity depends on the absolute temperature and the properties of the material composing the radiating body
e. Bodies black in colour are known as black bodies
Q. Baffles are provided in heat exchangers to
a. Provide better mechanical strength
b. Reduce heat transfer rate
c. Reduce vibrations
d. Increase heat transfer rate
e. Remove dirt
Q. Heat sensitive liquids are connected
a. By using insulated vessels
b. By using low intensity heating
c. By using deoxidisers
d. By using small quantities
e. By using vacuum
Q. Which sample of concrete may be expected to have highest value of thermal conductivity
a. Dry concrete having 0.4% rein-forcement
b. Concrete having 10% moisture by volume
c. Concrete having 10% meisture by volume and 0.4% reinforcement
d. Dry concrete
e. Concrete having 10% moisture by volume and 0.6% reinforcement
Q. Which rays have the least wavelength?
a. Ultraviolet
b. Cosmic rays
c. Irifrared
d. X-rays
e. Radio
Q. Ditus Boelter equation is applicable in case of fluids flowing in
a. Laminar region
b. Turbulent region
c. Transition region
d. Any of the above
e. None of the above
Q. Transmission of heat by molecular collision is
a. Scattering
b. Transmission
c. Radiation
d. Convection
e. Conduction
Q. The emissive power of a body depends on
a. Nature of body
b. Temperature of body
c. Physical nature
d. All of the above
e. None of the above