In forced convection, the heat transfer depends on _______________?
In forced convection, the heat transfer depends on _______________?
A. Re, Pr
B. Re, Gr
C. Mainly Gr
D. Re only
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_____________ paint has the minimum absorption co-efficient?
_____________ paint has the minimum absorption co-efficient?A. Black
B. White lead
C. Grey
D. Light creamSteam side heat transfer co-efficient in an evaporator is in the range of ______________ kcal/hr.m2°C?
Steam side heat transfer co-efficient in an evaporator is in the range of ______________ kcal/hr.m2°C?A. 10-50
B. 100-500
C. 1000-1500
D. 5000-15000Fourier’s law applies to the heat transfer by__________________?
Fourier’s law applies to the heat transfer by__________________?A. Convection
B. Radiation
C. Conduction
D. All A., B. & C.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]In the equation Q = UAΔt; Δt is_________________________?
In the equation Q = UAΔt; Δt is_________________________?A. Geometric mean temperature difference
B. Arithmetic mean temperature difference
C. Logarithmic mean temperature difference
D. The difference of average bulk temperatures of hot and cold fluidsIn a parallel flow heat exchanger, if the outlet temperature of hot and cold fluids are the same, then the log mean temperature difference (LMTD) is_________________?
In a parallel flow heat exchanger, if the outlet temperature of hot and cold fluids are the same, then the log mean temperature difference (LMTD) is_________________?A. Minimum
B. Maximum
C. Zero
D. Infinity