A. conduction
B. convection
C. radiation
D. conduction and convection
E. convection and radiation
Related Mcqs:
- When heat is transferred from one particle of hot body to another by actual motion of the heated particles, it is referred to as heat transfer by ___________________?
A. conduction
B. convection
C. radiation
D. conduction and convection
E. convection and radiation - When heat is Transferred by molecular collision, it is referred to as heat transfer by __________________?
A. conduction
B. convection
C. radiation
D. scattering
E. convection and radiation - In convection heat transfer from hot flue gases to water tube, even though flow may be turbulent, a laminar flow region (boundary layer of film) exists close to the tube. The heat transfer through this film takes place by___________________?
A. convection
B. radiation
C. conduction
D. both convection and conduction
E. none of the above - The concept of overall coefficient of heat transfer is used in case of heat transfer by________________?
A. conduction
B. convection
C. radiation
D. conduction and convection
E. convection and radiation - Heat is transferred by all three modes of transfer, viz, conduction, convection and radiation in _________________?
A. electric heater
B. steam condenser
C. melting of ice
D. refrigerator condenser coils
E. boiler - In regenerator type heat exchanger, heat transfer takes place by___________________?
A. direct mixing of hot and cold fluids
B. a complete separation between hot and cold fluids
C. flow of hot and cold fluids alternately over a surface
D. generation of heat again and again
E. indirect transfer - Stefan Boltzmann law is applicable for heat transfer by __________________?
A. conduction
B. convection
C. radiation
D. conduction and radiation combined
E. convection and radiation combined - Sensible heat is the heat required to __________________?
A. change vapour into liquid
B. change liquid into vapour
C. increase the temperature of a liquid of vapour
D. convert water into steam and superheat it
E. convert saturated steam into dry steam - A non-dimensional number generally associated with natural convection heat transfer is________________?
A. Grashoff number
B. Nusselt number
C. Weber number
D. Prandtl number
E. Reynold number - In free con-vection heat transfer, Nusselt number is function of________________?
A. Grashoff no. and Reynold no
B. Grashoff no and Prandtl no.
C. Prandtl no. and Reynold no
D. Grashoff no., Prandtl no and Reynold no
E. none of the above
