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
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

160 mm

40 mm

25 mm

800 mm

160 mm

40 mm

25 mm

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Heat and Mass Transfer
The process of heat transfer from one particle of the body to another is called conduction, when the particles of the body

Move actually

Does not affect the intervening medium

Do not move actually

Affect the intervening medium

Move actually

Does not affect the intervening medium

Do not move actually

Affect the intervening medium

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Heat and Mass Transfer
In heat exchangers, degree of approach is defined as the difference between temperatures of

Hot medium outlet and cold water outlet

Hot medium outlet and cold water inlet

Hot medium inlet and outlet

Cold water inlet and outlet

Hot medium outlet and cold water outlet

Hot medium outlet and cold water inlet

Hot medium inlet and outlet

Cold water inlet and outlet

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Heat and Mass Transfer
Depending on the radiating properties, body will be transparent when(Where a = absorptivity, p = reflectivity, x = transmissivity)

P=1, x = 0, and a = 0

X = 0, a + p = 1

P = 0, x = 0 and a = 1

P = 0, x= 1, and a = 0

P=1, x = 0, and a = 0

X = 0, a + p = 1

P = 0, x = 0 and a = 1

P = 0, x= 1, and a = 0

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

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

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

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

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

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

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

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Heat and Mass Transfer
Unit of thermal conductivity in M.K.S. units is

K cal/kg m² °C

K cal m/hr m² °C

K calm/hr °C

K cal/hr m² °C

K cal/kg m² °C

K cal m/hr m² °C

K calm/hr °C

K cal/hr m² °C

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Heat and Mass Transfer

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 The process of heat transfer from one particle of the body to another is called conduction, when the particles of the body

Heat and Mass Transfer In heat exchangers, degree of approach is defined as the difference between temperatures of

Heat and Mass Transfer Depending on the radiating properties, body will be transparent when(Where a = absorptivity, p = reflectivity, x = transmissivity)

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

Heat and Mass Transfer Unit of thermal conductivity in M.K.S. units 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
The process of heat transfer from one particle of the body to another is called conduction, when the particles of the body

Heat and Mass Transfer
In heat exchangers, degree of approach is defined as the difference between temperatures of

Heat and Mass Transfer
Depending on the radiating properties, body will be transparent when(Where a = absorptivity, p = reflectivity, x = transmissivity)

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

Heat and Mass Transfer
Unit of thermal conductivity in M.K.S. units is