March 2019 - Page 819 of 895 -

The film co-efficient is decreased due to the presence of non-condensing gases in the vapors. The film co-efficient of superheated vapor as compared to that of saturated vapor is___________________?

The film co-efficient is decreased due to the presence of non-condensing gases in the vapors. The film co-efficient of superheated vapor as compared to that of saturated vapor is___________________?

A. More
B. Less
C. Some
D. Either more or less; depends on the nature of vapor

The film co-efficient is decreased due to the presence of non-condensing gases in the vapors. The film co-efficient of superheated vapor as compared to that of saturated vapor is___________________? Read More »

Chemical Heat Transfer

Which of the following has maximum thermal conductivity ?

Chemical Heat Transfer / admin

Which of the following has maximum thermal conductivity ?

A. Iron
B. Coal
C. Nitrogen
D. Tar

Which of the following has maximum thermal conductivity ? Read More »

Chemical Heat Transfer

Thermal diffusivity of a material __________________?

Chemical Heat Transfer / admin

Thermal diffusivity of a material __________________?

A. Has the unit m2 /sec
B. Is defined as K/ρ . Cp
C. Is the ratio of thermal conductivity to thermal capacity
D. All A., B. and C.

Thermal diffusivity of a material __________________? Read More »

Chemical Heat Transfer

Nusselt number is the ratio of the temperature gradient at the wall to_________________?

Chemical Heat Transfer / admin

Nusselt number is the ratio of the temperature gradient at the wall to_________________?

A. Temperature difference
B. Heat flux
C. That across the entire pipe
D. None of these

Nusselt number is the ratio of the temperature gradient at the wall to_________________? Read More »

Chemical Heat Transfer

What is the unit of thermal conductivity ?

Chemical Heat Transfer / admin

What is the unit of thermal conductivity ?

A. Kcal/hr. m2 °C
B. Kcal/hr.m.°C
C. Kcal/hr.m
D. Kcal/hr. °C

What is the unit of thermal conductivity ? Read More »

Chemical Heat Transfer

Tubes are held between top and bottom tube sheets in Calandria type evaporator by keeping_________________?

Chemical Heat Transfer / admin

Tubes are held between top and bottom tube sheets in Calandria type evaporator by keeg_________________?

A. Both the tube sheets fixed
B. Both the tube sheets floating
C. The top tube sheet floating and bottom tube sheet fixed
D. The top tube sheet fixed and the bottom tube-sheet floating

Tubes are held between top and bottom tube sheets in Calandria type evaporator by keeping_________________? Read More »

Chemical Heat Transfer