Removal of ______________ heat is involved in the condensation of a vapor under saturated conditions?
A. Super
B. Sensible
C. Latent
D. Both B. & C.
Chemical Heat Transfer
The energy radiated from a surface Q at absolute temperature T is related as__________________?
The energy radiated from a surface Q at absolute temperature T is related as__________________?
A. Q ∝ T2
B. Q ∝ T4
C. Q ∝ T3
D. None of these
Absorptivity of a perfect black body is unity. Which of the following has maximum absorptivity ?
Absorptivity of a perfect black body is unity. Which of the following has maximum absorptivity ?
A. Aluminium foil
B. Refractory bricks
C. Iron plate
D. Coke breeze
Crystallisation of solids from a homogeneous solution is a/an ______________ process?
Crystallisation of solids from a homogeneous solution is a/an ______________ process?
A. Exothermic
B. Mildly endothermic
C. Highly endothermic
D. None of these
Steam condensate is recovered by steam traps and recycled for use as boiler feed water, because of its low___________________?
Steam condensate is recovered by steam traps and recycled for use as boiler feed water, because of its low___________________?
A. Hardness
B. Dissolved solids content
C. Suspended solids content
D. All A., B. and C.
_______________ paint has the maximum absorption coefficient ?
_______________ paint has the maximum absorption coefficient ?
A. Black
B. Yellow
C. White
D. Grey
Baffles are provided in heat exchangers to increase the________________?
Baffles are provided in heat exchangers to increase the________________?
A. Fouling factor
B. Heat transfer area
C. Heat transfer co-efficient
D. Heat transfer rate
Prandtl and Reynold’s analogies are identical for Prandtl number value of__________________?
Prandtl and Reynold’s analogies are identical for Prandtl number value of__________________?
A. 0
B. 0.5
C. 1
D. 5
The rate of heat transfer through a pipe wall is given by, q = 2π k (Ti – T0)/ln (ri/r0). For cylinder of very thin wall, q can be approximated by__________________?
The rate of heat transfer through a pipe wall is given by, q = 2π k (Ti – T0)/ln (ri/r0). For cylinder of very thin wall, q can be approximated by__________________?
A. q = [2π k (Ti + T0)/2]/ln (ri/r0)
B. q = 2π ri k (Ti – T0)/(r0/ri)
C. q = 2π k (Ti – T0)/(r0/ri)
D. q = 2π k (Ti – T0)/[(r0 + ri)/2]
If a single tube pass heat exchanger is converted to two pass, then for the same flow rate, the pressure drop per unit length in tube side will ________________?
If a single tube pass heat exchanger is converted to two pass, then for the same flow rate, the pressure drop per unit length in tube side will ________________?
A. Increase by 1.8 times
B. Decrease by 22
C. Increase by 216
D. Remain unchanged