Prandtl number is given by__________________?
A. CP μ/a
B. hD/k
C. CP μ/k
D. μ/h CP
Month: March 2019
Trap is used to remove ________________ from steam pipe lines?
Trap is used to remove ________________ from steam pipe lines?
A. Steam
B. Condensate
C. Non-condensable
D. None of these
Wavelength corresponding to the maximum energy is inversely proportional to the absolute temperature. This is ________________ law?
Wavelength corresponding to the maximum energy is inversely proportional to the absolute temperature. This is ________________ law?
A. Stefan’s
B. Dalton’s
C. Wien’s
D. Kirchoff’s
Economy of a multiple effect evaporator depends upon the _____________________?
Economy of a multiple effect evaporator depends upon the _____________________?
A. Heat balance consideration
B. Rate of heat transfer
C. Both A. and B.
D. Neither A. nor B.
A wall has two layers of materials A and B; each made of a different material. Both the layers have the same thickness. The thermal conductivity of material A is twice that of B. Under the equilibrium, the temperature difference across the wall is 36°C. The temperature difference across the layer A is ______________ °C?
A wall has two layers of materials A and B; each made of a different material. Both the layers have the same thickness. The thermal conductivity of material A is twice that of B. Under the equilibrium, the temperature difference across the wall is 36°C. The temperature difference across the layer A is ______________ °C?
A. 6
B. 12
C. 18
D. 24
Temperature profile in steady state heat transfer is________________?
Temperature profile in steady state heat transfer is________________?
A. Asymptotic
B. Hyperbolic
C. Parabolic
D. Linear
Maximum water velocity in tubes of a 1-2 shell and tube heat exchanger may be around _____________ metres/second?
Maximum water velocity in tubes of a 1-2 shell and tube heat exchanger may be around _____________ metres/second?
A. 1
B. 10
C. 20
D. 30
A tank painted with which of the following coloured paints, would heat up maximum by radiation from sun ?
A tank painted with which of the following coloured paints, would heat up maximum by radiation from sun ?
A. Yellow paint
B. White paint
C. Black paint
D. Grey paint
Three materials A, B and C of equal thickness and of thermal conductivity of 20, 40 & 60 kcal/hr. m. °C respectively are joined together. The temperature outside of A and C are 30°C and 100°C respectively. The interface between B and C will be at a temperature of ____________ °C?
Three materials A, B and C of equal thickness and of thermal conductivity of 20, 40 & 60 kcal/hr. m. °C respectively are joined together. The temperature outside of A and C are 30°C and 100°C respectively. The interface between B and C will be at a temperature of ____________ °C?
A. 40
B. 95
C. 70
D. 50
Evaporation by thermo compression results in the _________________________?
Evaporation by thermo compression results in the _________________________?
A. Saving of steam
B. Realisation of multiple effect economy in a single effect
C. Both A. and B.
D. None of these