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
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
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
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
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
A. 3
B. 6
C. 9
D. 27
E. 81