Prandtl number is given by__________________?
Prandtl number is given by__________________?
A. CP μ/a
B. hD/k
C. CP μ/k
D. μ/h CP
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Small scale evaporation is done in a_________________?
Small scale evaporation is done in a_________________?A. Heat exchanger
B. Condenser
C. Multiple effect evaporator
D. Steam jacketed kettleA _____________ evaporator employs an annular downtake?
A _____________ evaporator employs an annular downtake?A. Basket type
B. Horizontal
C. Long tube vertical
D. None of theseWith increase in temperature, the thermal conductivity of steel___________________?
With increase in temperature, the thermal conductivity of steel___________________?A. Increases
B. Decreases
C. Remains unchanged
D. Increases exponentiallyThe 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 theseA hollow sphere and a solid sphere of the same material and equal radii are heated to the same temperature. In this case ?
A hollow sphere and a solid sphere of the same material and equal radii are heated to the same temperature. In this case ?A. The cooling rate will be the same for the two spheres and hence the two spheres will have
equal temperatures at any instant
B. Both the spheres will emit equal amount of radiation per unit time in the beginning
C. Both will absorb equal amount of radiation from the surrounding in the beginning
D. Both B. & C.Heat transfer rate per unit area is called_________________?
Heat transfer rate per unit area is called_________________?A. Thermal conductivity
B. Heat flux
C. Heat transfer co-efficient
D. Thermal diffusivity