Nusselt number is a function of Prandtl number and ______________ number of fluid in natural convection heat transfer?

Byadmin March 2, 2019August 24, 2021

Nusselt number is a function of Prandtl number and ______________ number of fluid in natural convection heat transfer?

A. Grashoff
B. Biot
C. Stanton
D. Reynolds

Chemical Heat Transfer

In counter flow compared to parallel flow, ?

In counter flow compared to parallel flow, ?

A. LMTD is greater
B. Less surface area is required for a given heat transfer rate
C. Both A. and B.
D. More surface area is required for a given heat transfer rate

Read More In counter flow compared to parallel flow, ?
Chemical Heat Transfer

Fouling factor for a heat exchanger is given by (where, U1 = heat transfer co-efficient of dirty surface U2 = heat transfer co-efficient of clean surface) ?

Fouling factor for a heat exchanger is given by (where, U1 = heat transfer co-efficient of dirty surface U2 = heat transfer co-efficient of clean surface) ?

A. U1 – U2
B. 1/U1 – 1/U2
C. 1/U2 – 1/U1
D. U2 – U1

Read More Fouling factor for a heat exchanger is given by (where, U1 = heat transfer co-efficient of dirty surface U2 = heat transfer co-efficient of clean surface) ?
Chemical Heat Transfer

At constant temperature, the thermal conductivities of gases _____________ with rise in pressure?

At constant temperature, the thermal conductivities of gases _____________ with rise in pressure?

A. Decrease
B. Increase
C. Remain unchanged
D. May increase or decrease; depends on the pressure

Read More At constant temperature, the thermal conductivities of gases _____________ with rise in pressure?
Chemical Heat Transfer

In Joule’s experiment, an insulated container contains 20 kg of water initially at 25°C. It is stirred by an agitator, which is made to turn by a slowly falling body weighing 40 kg through a height of 4 m. The process is repeated 500 times. The acceleration due to gravity is 9.8 ms-2. Neglecting the heat capacity of agitator, the temperature of water (in °C) is________________?

In Joule’s experiment, an insulated container contains 20 kg of water initially at 25°C. It is stirred by an agitator, which is made to turn by a slowly falling body weighing 40 kg through a height of 4 m. The process is repeated 500 times. The acceleration due to gravity is 9.8 ms-2. Neglecting the heat capacity of agitator, the temperature of water (in °C) is________________?

A. 40.5
B. 34.4
C. 26.8
D. 25

Read More In Joule’s experiment, an insulated container contains 20 kg of water initially at 25°C. It is stirred by an agitator, which is made to turn by a slowly falling body weighing 40 kg through a height of 4 m. The process is repeated 500 times. The acceleration due to gravity is 9.8 ms-2. Neglecting the heat capacity of agitator, the temperature of water (in °C) is________________?
Chemical Heat Transfer

In case of a vertical tube evaporator, with increase in the liquor level, the___________________?

In case of a vertical tube evaporator, with increase in the liquor level, the___________________?

A. Capacity of the evaporator is decreased
B. Capacity of the evaporator is increased
C. True temperature drop increases
D. Both B. and C.

Read More In case of a vertical tube evaporator, with increase in the liquor level, the___________________?
Chemical Heat Transfer

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

Read More 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___________________?

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