In the indirect resistance heating method, maximum heat-transfer takes place by

In an electric room heat convector the method of heating used is Resistance heating

A

True

B

False

In resistance heating highest working temperature is obtained from heating elements made of

A

Nickel copper

B

Nichrome

C

Silicon carbide

D

Silver

Heating wet steam at constant temperature is heating it at constant

A

Volume

B

Pressure

C

Entropy

D

Enthalpy

In a regenerative feed heating cycle, the optimum value of the fraction of steam extracted for feed heating

A

Decreases with increase in Rankine cycle efficiency

B

Increases with increase in Rankine cycle efficiency

C

Is unaffected by increase in Rankine cycle efficiency

D

None of the above

In heating the ferromagnetic material by induction heating, heat is produced due to

A

Induced current flow through the charge

B

Hysteresis loss taking place below Curie temperature

C

Due to hysteresis loss as well as eddy current loss taking place in the charge

D

None of the above factors

Gross heating value of coal is __________ the net heating value.

A

Higher than

B

Lower than

C

Same as

D

None of these

An alloy used in making heating elements for electric heating device is

A

Solder

B

Alloy Steel

C

Nichrome

D

German Silver

Induction heating takes place in which of the following?

A

Insulating materials

B

Conducting materials which are magnetic

C

Conducting materials which are nonmagnetic

D

Conducting materials which may or may not be magnetic

Induction heating takes place it which of the following?

A

Insulating materials

B

Conducting materials which are magnetic

C

Conducting materials which are non-magnetic

D

Conducting materials which may or may not be magnetic

When vaporisation takes place directly at the heating surface, it is called

A

Film boiling

B

Nucleate boiling

C

Vapour binding

D

None of these

In the indirect resistance heating method, maximum heat-transfer takes place by

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