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Chapter:

Transient-(Unsteady-State-Heat-Conduction)

1. Which of following is an example of forced convection?


Hint Answer

2. An oil cooler in a high performance engine has an outside surface area 0.12 m2 and a surface temperature of 65 degree Celsius. At any intermediate time air moves over surface of cooler at a temperature of 30 degree Celsius and gives rise to a surface coefficient equal to 45.4 W/ m 2 K. Find out heat transfer rate?


Hint Answer

3. Convective heat transfer coefficient doesn’t depend on


Hint Answer

4. Consider system A at uniform temperature t and system B at anor uniform temperature T (t > T). Let two systems be brought into contact and be rmally insulated from ir surroundings but not from each or. Energy will flow from system A to system B because of
Consider system A at uniform temperature t and system B at anor uniform temperature T (t > T). Let two systems be brought into contact and be rmally insulated from ir surroundings but not from each or. Energy will flow from system A to system B because of\r\n


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5. Thermal conductivity is maximum for which substance


Hint Answer

6. The rate equation used to describe mechanism of convection is called Newton’s law of cooling. So rate of heat flow by convection doesn’t depend on


Hint Answer

7. How many types of convection process are re?


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8. Unit of rate of heat transfer is


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9. A radiator in a domestic heating system operates at a surface temperature of 60 degree Celsius. Calculate heat flux at surface of radiator if it behaves as a black body


Hint Answer

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Topics

This Chapter Transient-(Unsteady-State-Heat-Conduction) consists of the following topics

Definitions and Basic Concepts

Which of following is an example of forced convection?

;

An oil cooler in a high performance engine has an outside surface area 0.12 m2 and a surface temperature of 65 degree Celsius. At any intermediate time air moves over surface of cooler at a temperature of 30 degree Celsius and gives rise to a surface coefficient equal to 45.4 W/ m 2 K. Find out heat transfer rate?

;

Convective heat transfer coefficient doesn’t depend on

;

Consider system A at uniform temperature t and system B at anor uniform temperature T (t > T). Let two systems be brought into contact and be rmally insulated from ir surroundings but not from each or. Energy will flow from system A to system B because of
Consider system A at uniform temperature t and system B at anor uniform temperature T (t > T). Let two systems be brought into contact and be rmally insulated from ir surroundings but not from each or. Energy will flow from system A to system B because of\r\n

;

Thermal conductivity is maximum for which substance

;

The rate equation used to describe mechanism of convection is called Newton’s law of cooling. So rate of heat flow by convection doesn’t depend on

;

How many types of convection process are re?

;

Unit of rate of heat transfer is

;

A radiator in a domestic heating system operates at a surface temperature of 60 degree Celsius. Calculate heat flux at surface of radiator if it behaves as a black body

;