1000 Kg of liquid at 30°C in a well stirred vessel has to be heated to 120°C, using immersed coils carrying condensing steam at 150°C. The area of the steam coils is 1.2 m² and the overall heat transfer co-efficient to the liquid is 1500 W/m².°C. Assuming negligible heat loss to the surrounding and specific heat capacity of the liquid to be 4 kJ/kg.°C, the time taken for the liquid to reach desired temperature will be

Heat Transfer
1000 Kg of liquid at 30°C in a well stirred vessel has to be heated to 120°C, using immersed coils carrying condensing steam at 150°C. The area of the steam coils is 1.2 m² and the overall heat transfer co-efficient to the liquid is 1500 W/m².°C. Assuming negligible heat loss to the surrounding and specific heat capacity of the liquid to be 4 kJ/kg.°C, the time taken for the liquid to reach desired temperature will be

51 min

44 min

15 min

22 min

51 min

44 min

15 min

22 min

ANSWER DOWNLOAD EXAMIANS APP

Heat Transfer
Nusselt number is the ratio of the

Temperature gradient of the wall to that across the entire pipe

Temperature difference to the temperature gradient at the wall

None of these

Heat flux at the wall to that across the entire pipe

Temperature gradient of the wall to that across the entire pipe

Temperature difference to the temperature gradient at the wall

None of these

Heat flux at the wall to that across the entire pipe

ANSWER DOWNLOAD EXAMIANS APP

Heat Transfer
The inside heat transfer co-efficient in case of turbulent flow of liquid in the tube side in a 1-2 shell and tube heat exchanger is increased by __________ times, when the number of tube passes is increased to 8.

20.8

40.4

40.8

20.4

20.8

40.4

40.8

20.4

ANSWER DOWNLOAD EXAMIANS APP

Heat Transfer
Prandtl number is the ratio of

Momentum diffusivity to mass diffusivity

Thermal diffusivity to momentum diffusivity

Momentum diffusivity to thermal diffusivity

Thermal diffusivity to mass diffusivity

Momentum diffusivity to mass diffusivity

Thermal diffusivity to momentum diffusivity

Momentum diffusivity to thermal diffusivity

Thermal diffusivity to mass diffusivity

ANSWER DOWNLOAD EXAMIANS APP

Heat Transfer
Vibrations in the tubes of a shell and tube heat exchanger is induced due to the

Oscillations in the flow of shell/tube sides fluid

Vibrations transmitted through piping and/or supports due to external reasons

Flow of fluid on the tube and shell sides

All of these

Oscillations in the flow of shell/tube sides fluid

Vibrations transmitted through piping and/or supports due to external reasons

Flow of fluid on the tube and shell sides

All of these

ANSWER DOWNLOAD EXAMIANS APP

Heat Transfer
jH factor for heat transfer depends upon the __________ number.

Biot

Reynolds

Nusselt

Prandtl

Biot

Reynolds

Nusselt

Prandtl

ANSWER DOWNLOAD EXAMIANS APP

Heat Transfer

Heat Transfer Nusselt number is the ratio of the

Heat Transfer The inside heat transfer co-efficient in case of turbulent flow of liquid in the tube side in a 1-2 shell and tube heat exchanger is increased by __________ times, when the number of tube passes is increased to 8.

Heat Transfer Prandtl number is the ratio of

Heat Transfer Vibrations in the tubes of a shell and tube heat exchanger is induced due to the

Heat Transfer jH factor for heat transfer depends upon the __________ number.

Heat Transfer
Nusselt number is the ratio of the

Heat Transfer
The inside heat transfer co-efficient in case of turbulent flow of liquid in the tube side in a 1-2 shell and tube heat exchanger is increased by __________ times, when the number of tube passes is increased to 8.

Heat Transfer
Prandtl number is the ratio of

Heat Transfer
Vibrations in the tubes of a shell and tube heat exchanger is induced due to the

Heat Transfer
jH factor for heat transfer depends upon the __________ number.