Prandtl number for most of dry gases is about________________?
Prandtl number for most of dry gases is about________________?
A. 0.001
B. 0.72
C. 70
D. 150
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The absorptivity of a body is equal to its emissivity _________________?
The absorptivity of a body is equal to its emissivity _________________?A. At a particular temperature
B. For circular bodies
C. Under thermal equilibrium
D. None of theseFor the same heat transfer area and the terminal conditions, the ratio of the capacities of a single effect evaporator to a triple effect evaporator is_________________?
For the same heat transfer area and the terminal conditions, the ratio of the capacities of a single effect evaporator to a triple effect evaporator is_________________?A. 3
B. 0.33
C. 1
D. 1.33What is the thermal conductivity of a perfect heat insulator ?
What is the thermal conductivity of a perfect heat insulator ?A. Zero
B. One
C. ∞
D. Between 0 and ∞Heat transfer occurs by natural convection because change in temperature causes difference in__________________?
Heat transfer occurs by natural convection because change in temperature causes difference in__________________?A. Viscosity
B. Density
C. Thermal conductivity
D. Heat capacityDuring crystallisation, formation of crystal can occur in ______________ solution only?
During crystallisation, formation of crystal can occur in ______________ solution only?A. Saturated
B. Supersaturated
C. Under-saturated
D. All A., B. and C.Economy of an evaporator is influenced by the_____________________?
Economy of an evaporator is influenced by the_____________________?A. Steam pressure
B. Feed temperature
C. Number of effect
D. Both B. & C.