A. temperature
B. thickness
C. area
D. time
E. area and time
A. 0.45
B. 0.55
C. 0.40
D. 0.75
E. 0.60
A. temperature
B. wave length
C. physical nature
D. all of the above
E. none of the above
The emissive power of a body depends upon its___________________? Read More »
Heat Transfer A. absorptive power
B. emissive power
C. absorptivity
D. emissivity
E. none of the above
A. nature of body
B. temperature of body
C. type of surface of body
D. all of the above
E. none of the above
The amount of radiation mainly depends on___________________? Read More »
Heat Transfer A. at all temperatures
B. at one particular temperature
C. when system is under thermal equi-librium
D. at critical temperature
E. for a polished body
Absorptivity of a body will be equal to its emissivity___________________? Read More »
Heat Transfer A. p = 0, x = 0 and a = 1
B. p=l,x = 0,anda = 0
C. p = 0, T= l,anda = 0
D. X = 0, a + p = 1
E. a = 0,x + p= 1
Depending on the radiating properties, body will be transparent when________________? Read More »
Heat Transfer A. convection
B. free convection
C. forced convection
D. radiation
E. radiation and convection
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
In regenerator type heat exchanger, heat transfer takes place by___________________? Read More »
Heat Transfer A. 3
B. 6
C. 9
D. 27
E. 81
