The number of kg vaporised per kg of steam fed to the evaporator is defined as____________?
A. Capacity
B. Rate of evaporation
C. Economy
D. Rate of vaporisation
Chemical Heat Transfer
Convective heat transfer co-efficient in case of fluid flowing in tubes is not affected by the tube length/diameter ratio, if the flow is in the _____________ zone?
Convective heat transfer co-efficient in case of fluid flowing in tubes is not affected by the tube length/diameter ratio, if the flow is in the _____________ zone?
A. Laminar
B. Transition
C. Both A & B
D. Highly turbulent
Which of the following is unimportant in forced convection ?
Which of the following is unimportant in forced convection ?
A. Reynolds number
B. Prandtl number
C. Grashoff number
D. None of these
Steam consumption in kg/hr in case of an evaporator is given by (where, C & E are capacity the economy of the evaporator respectively) ?
Steam consumption in kg/hr in case of an evaporator is given by (where, C & E are capacity the economy of the evaporator respectively) ?
A. C/E
B. E/C
C. CE
D. 1/CE
Dittus-Boelter equation cannot be used for molten metals mainly due to its very low_____________________?
Dittus-Boelter equation cannot be used for molten metals mainly due to its very low_____________________?
A. Prandtl number
B. Grashoff number
C. Thermal conductivity
D. Viscosity
The heat flux (from outside to inside) across an insulating wall with thermal conductivity, K = 0.04 W/m.°K and thickness 0.16m is 10 W/m2. The temperature of the inside wall is – 5°C. The outside wall temperature is___________________?
The heat flux (from outside to inside) across an insulating wall with thermal conductivity, K = 0.04 W/m.°K and thickness 0.16m is 10 W/m2. The temperature of the inside wall is – 5°C. The outside wall temperature is___________________?
A. 25°C
B. 30°C
C. 35°C
D. 40°C
In a multipass shell and tube heat exchanger, tube side return pressure loss is equal to _____________ the velocity head?
In a multipass shell and tube heat exchanger, tube side return pressure loss is equal to _____________ the velocity head?
A. Twice
B. Four times
C. Square root of
D. Square of
Heat produced when a steady state current, I passes through an electrical conductor having resistance, ‘R’ is___________________?
Heat produced when a steady state current, I passes through an electrical conductor having resistance, ‘R’ is___________________?
A. IR
B. I2R
C. IR2
D. I2R2
The heat transfer by radiation from a mild steel surface is to be reduced by reducing the emissivity of the surface. This can be best achieved by__________________?
The heat transfer by radiation from a mild steel surface is to be reduced by reducing the emissivity of the surface. This can be best achieved by__________________?
A. Painting the surface black
B. Painting the surface white (with aluminium paint)
C. Giving the surface a mirror finish
D. Roughening the surface
Fourier’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.