Properly of low temperature co-eflficient of heating element is desired due to which of the following reasons?

Properly of low temperature coefficient of heating element is desired due to which of the following reasons?

A

To avoid initial rush of current

B

To avoid change in kW rating with temperature

C

Both (A) and (B)

D

Either (A) or (B)

Due to which of the following reasons copper and aluminium are not used for heating elements ?

A

Both have great tendency for oxidation

B

Both have low melting point

C

Very large length of wires will be required

D

All 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

Heating wet steam at constant temperature is heating it at constant

A

Volume

B

Pressure

C

Entropy

D

Enthalpy

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

A

Nickel copper

B

Nichrome

C

Silicon carbide

D

Silver

For reactions in parallel viz A → P (desired product) and A → Q (unwanted product), if the order of the desired reaction is higher than that of the undesired reaction, a

A

Batch reactor is preferred over a single CSTR for high yield

B

Tubular reactor is preferred over a single CSTR for high yield

C

Both A and B

D

Single CSTR is the most suitable

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

A

True

B

False

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

Properly of low temperature co-eflficient of heating element is desired due to which of the following reasons?

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