Chemical Heat Transfer

The dimensionless group in mass transfer that is equivalent to Prandtl number in heat transfer is_________________?

Byadmin March 2, 2019August 24, 2021

The dimensionless group in mass transfer that is equivalent to Prandtl number in heat transfer is_________________?

A. Nusselt number
B. Sherwood number
C. Schmidt number
D. Stanton number

Chemical Heat Transfer

In case of surface condensers, a straight line is obtained on plotting 1/U vs. ____________ on an ordinary graph paper?

In case of surface condensers, a straight line is obtained on plotting 1/U vs. ____________ on an ordinary graph paper?

A. 1/V̅ -0.8
B. V̅ -0.8
C. V̅ -2
D. 1/ V̅ -2

Read More In case of surface condensers, a straight line is obtained on plotting 1/U vs. ____________ on an ordinary graph paper?
Chemical Heat Transfer

Indirect contact heat exchangers are preferred over direct contact heat exchangers, because_________________?

Indirect contact heat exchangers are preferred over direct contact heat exchangers, because_________________?

A. Heat transfer co-efficient are high
B. There is no risk of contamination
C. There is no mist formation
D. Cost of equipment is lower

Read More Indirect contact heat exchangers are preferred over direct contact heat exchangers, because_________________?
Chemical Heat Transfer

In a boiling curve, the peak heat flux is called the _____________ point?

In a boiling curve, the peak heat flux is called the _____________ point?

A. Nusselt
B. Leidenfrost
C. Boiling
D. Burnout

Read More In a boiling curve, the peak heat flux is called the _____________ point?
Chemical Heat Transfer

Walls of a cubical oven are of thickness l, and they are made of material of thermal conductivity k. The temperature inside the oven is 100°C and the inside heat transfer coefficient is „3k/l’. If the wall temperature on the outside is held at 25°C, what is the inside wall temperature in degree centigrade ?

Walls of a cubical oven are of thickness l, and they are made of material of thermal conductivity k. The temperature inside the oven is 100°C and the inside heat transfer coefficient is „3k/l’. If the wall temperature on the outside is held at 25°C, what is the inside wall temperature in degree centigrade ?

A. 35.5
B. 43.75
C. 81.25
D. 48.25

Read More Walls of a cubical oven are of thickness l, and they are made of material of thermal conductivity k. The temperature inside the oven is 100°C and the inside heat transfer coefficient is „3k/l’. If the wall temperature on the outside is held at 25°C, what is the inside wall temperature in degree centigrade ?
Chemical Heat Transfer

Overall heat transfer co-efficient of a particular tube is U1. If the same tube with some dirt deposited on either side has coefficient U2, then_________________?

Overall heat transfer co-efficient of a particular tube is U1. If the same tube with some dirt deposited on either side has coefficient U2, then_________________?

A. U1 = U2
B. U2 > U1
C. U1 > U2
D. U1 = dirt factor – U2

Read More Overall heat transfer co-efficient of a particular tube is U1. If the same tube with some dirt deposited on either side has coefficient U2, then_________________?
Chemical Heat Transfer

In a co-current double pipe heat exchanger used for condensing saturated steam over the inner tube, if the entrance and exit conditions of the coolant are interchanged, then the rate of condensation will___________________?

In a co-current double pipe heat exchanger used for condensing saturated steam over the inner tube, if the entrance and exit conditions of the coolant are interchanged, then the rate of condensation will___________________?

A. Increase
B. Decrease
C. Remain unchanged
D. Either increase or decrease; depends on the coolant flow rate

Read More In a co-current double pipe heat exchanger used for condensing saturated steam over the inner tube, if the entrance and exit conditions of the coolant are interchanged, then the rate of condensation will___________________?

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