A measure of the extent to which viscous heating is important relative to the heat flow resulting from the impressed temperature difference is represented by the __________ number.

"I impressed the lesson upon him. 'What does 'impressed" mean here?

A

An impact cast upon one's mind

B

A learning sent to someone

C

An idea shared to someone

D

A lesson conveyed to someone

In a heating process, a heat flow diagram in which the quantities of heat in the various items of a heat balance are represented by the width of a band is called the

A

Ostwald chart

B

Cox chart

C

Sankey diagram

D

None of these

India's latitudinal and longitudinal extent measured in degrees are almost the same, but its north-south extent measured in km is greater than its east-west extent. This is due to the fact that

A

Longitudes are not parallel lines

B

The distance between latitudes remains the same but the distance between longitudes is greatest at the Equator and nil at the poles where all longitudes join

C

All longitudes with their opposites form great circles

D

The earth is not a perfect sphere

In counter current flow heat exchanger, the logarithmic temperature difference between the fluids is ________ as compared to parallel flow heat exchanger.

A

Same

B

Less

C

Greater

D

None of these

What is the ratio of the velocity at the axis of the pipe to the mean velocity of flow in case of pipe flow under viscous condition?

A

0.5

B

0.67

C

1

D

2

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

A

True

B

False

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

The relative heat absorption for successively added equal areas of boiler convection heating surfaces

A

Increases

B

Decreases

C

Remain unaffected

D

First increases and then decreases

A measure of the extent to which viscous heating is important relative to the heat flow resulting from the impressed temperature difference is represented by the __________ number.

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