The critical temperature is the temperature

Heat and Mass Transfer
The critical temperature is the temperature

Above which a gas will never liquefied

Below which a gas does not obey gas laws

Above which a gas may explode

Below which a gas is always liquefied

Above which a gas will never liquefied

Below which a gas does not obey gas laws

Above which a gas may explode

Below which a gas is always liquefied

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Heat and Mass Transfer
Thermal conductivity of a material may be defined as the

Quantity of heat flowing in one second through a slab of the material of area one cm square, thickness 1 cm when its faces differ in temperature by 1°C

Quantity of heat flowing in one second through one cm cube of material when opposite faces are maintained at a temperature difference of 1°C

Heat conducted in unit time across unit area through unit thickness when a temperature difference of unity is maintained between opposite faces

All of these

Quantity of heat flowing in one second through a slab of the material of area one cm square, thickness 1 cm when its faces differ in temperature by 1°C

Quantity of heat flowing in one second through one cm cube of material when opposite faces are maintained at a temperature difference of 1°C

Heat conducted in unit time across unit area through unit thickness when a temperature difference of unity is maintained between opposite faces

All of these

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Heat and Mass Transfer
If the energy radiated per second per sq. cm. of the surface for wave lengths lying between λ, and λ + dλ is represented by (eλ.dλ), then eλ is called

Emissivity

None of these

Absorptive power

Emissive power

Emissivity

None of these

Absorptive power

Emissive power

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Heat and Mass Transfer
According to Newton's law of cooling, the heat transfer from a hot body to a cold body is

Directly proportional to the surface area

Both (A) and (B)

Directly proportional to the difference of temperatures between the two bodies

Either (A) or (B)

Directly proportional to the surface area

Both (A) and (B)

Directly proportional to the difference of temperatures between the two bodies

Either (A) or (B)

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Heat and Mass Transfer
An electric cable of aluminium conductor (k = 240 W/mK) is to be insulated with rubber (k = 0.15 W/mK). The cable is to be located in air (h = 6 W/m²). The critical thickness of insulation will be

800 mm

40 mm

160 mm

25 mm

800 mm

40 mm

160 mm

25 mm

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Heat and Mass Transfer
Which of the following is expected to have highest thermal conductivity?

Melting ice

Solid ice

Water

Steam

Melting ice

Solid ice

Water

Steam

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Heat and Mass Transfer

Heat and Mass Transfer The critical temperature is the temperature

Heat and Mass Transfer Thermal conductivity of a material may be defined as the

Heat and Mass Transfer If the energy radiated per second per sq. cm. of the surface for wave lengths lying between λ, and λ + dλ is represented by (eλ.dλ), then eλ is called

Heat and Mass Transfer According to Newton's law of cooling, the heat transfer from a hot body to a cold body is

Heat and Mass Transfer An electric cable of aluminium conductor (k = 240 W/mK) is to be insulated with rubber (k = 0.15 W/mK). The cable is to be located in air (h = 6 W/m²). The critical thickness of insulation will be

Heat and Mass Transfer Which of the following is expected to have highest thermal conductivity?

Heat and Mass Transfer
The critical temperature is the temperature

Heat and Mass Transfer
Thermal conductivity of a material may be defined as the

Heat and Mass Transfer
If the energy radiated per second per sq. cm. of the surface for wave lengths lying between λ, and λ + dλ is represented by (eλ.dλ), then eλ is called

Heat and Mass Transfer
According to Newton's law of cooling, the heat transfer from a hot body to a cold body is

Heat and Mass Transfer
An electric cable of aluminium conductor (k = 240 W/mK) is to be insulated with rubber (k = 0.15 W/mK). The cable is to be located in air (h = 6 W/m²). The critical thickness of insulation will be

Heat and Mass Transfer
Which of the following is expected to have highest thermal conductivity?