Chemical Heat Transfer Archives

Heat exchangers operating, when the asymptotic range is reached, ?

Heat exchangers operating, when the asymptotic range is reached, ?

A. Provide very large heat transfer co-efficient
B. Results in making part of the heating surface inactive
C. Results in abruptly increased velocity
D. None of these

Heat exchangers operating, when the asymptotic range is reached, ? Read More »

Chemical Heat Transfer

In counter flow compared to parallel flow, ?

Chemical Heat Transfer / admin

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

In counter flow compared to parallel flow, ? Read More »

Chemical Heat Transfer

Mode of heat transfer involved in the cooling of air cooled internal combustion engine is_________________?

Chemical Heat Transfer / admin

Mode of heat transfer involved in the cooling of air cooled internal combustion engine is_________________?

A. Conduction
B. Natural convection
C. Forced convection
D. None of these

Mode of heat transfer involved in the cooling of air cooled internal combustion engine is_________________? Read More »

Chemical Heat Transfer

In a single effect evaporator, the economy is________________?

Chemical Heat Transfer / admin

In a single effect evaporator, the economy is________________?

A. 1
B. < 1
C. > 1
D. None of these

In a single effect evaporator, the economy is________________? Read More »

Chemical Heat Transfer

Small scale evaporation is done in a_________________?

Chemical Heat Transfer / admin

Small scale evaporation is done in a_________________?

A. Heat exchanger
B. Condenser
C. Multiple effect evaporator
D. Steam jacketed kettle

Small scale evaporation is done in a_________________? Read More »

Chemical Heat Transfer

In a liquid-liquid heat exchanger, for the same process temperature, the ratio of the LMTD in parallel flow to the LMTD in counter flow is always__________________?

Chemical Heat Transfer / admin

In a liquid-liquid heat exchanger, for the same process temperature, the ratio of the LMTD in parallel flow to the LMTD in counter flow is always__________________?

A. < 1
B. > 1
C. 1
D. ∞

In a liquid-liquid heat exchanger, for the same process temperature, the ratio of the LMTD in parallel flow to the LMTD in counter flow is always__________________? Read More »

Chemical Heat Transfer

Low thermal conductivity of heat insulating materials is due to its_________________?

Chemical Heat Transfer / admin

Low thermal conductivity of heat insulating materials is due to its_________________?

A. Dense structure
B. High proportion of air space
C. High specific heat
D. None of these

Low thermal conductivity of heat insulating materials is due to its_________________? Read More »

Chemical Heat Transfer

Low thermal conductivity of heat insulating materials is due to its_______________?

Chemical Heat Transfer / admin

Low thermal conductivity of heat insulating materials is due to its_______________?

A. Dense structure
B. High proportion of air space
C. High specific heat
D. None of these

Low thermal conductivity of heat insulating materials is due to its_______________? Read More »

Chemical Heat Transfer

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

Chemical Heat Transfer / admin

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.

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

Chemical Heat Transfer

The rate of heat transfer is a product of overall heat transfer co-efficient, the difference in temperature and the___________________?

Chemical Heat Transfer / admin

The rate of heat transfer is a product of overall heat transfer co-efficient, the difference in temperature and the___________________?

A. Heating volume
B. Heat transfer area
C. Nusselt number
D. None of these

The rate of heat transfer is a product of overall heat transfer co-efficient, the difference in temperature and the___________________? Read More »

Chemical Heat Transfer