A long iron rod initially at a temperature of 20°C has one end dipped in boiling water (100°C) at time, t = 0. The curved surface of the rod is insulated so that heat conduction is one dimensional in the axial direction. The temperature at a distance 100 mm from the dipped end becomes 40°C at time, t = 200 s. The same temperature is achieved at a distance of 200 mm from the dipped end at time

Heat Transfer
A long iron rod initially at a temperature of 20°C has one end dipped in boiling water (100°C) at time, t = 0. The curved surface of the rod is insulated so that heat conduction is one dimensional in the axial direction. The temperature at a distance 100 mm from the dipped end becomes 40°C at time, t = 200 s. The same temperature is achieved at a distance of 200 mm from the dipped end at time

t = 800 s

t = 400 s

t = 283 s

t = 356 s

t = 800 s

t = 400 s

t = 283 s

t = 356 s

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Heat Transfer
The advantage of backward feed multiple effect evaporators over forward feed units is that

There is no additional cost of pumping

Heat sensitive material can be handled

Most concentrated liquid is at highest temperature

Equal heat transfer co-efficients exist in various effects

There is no additional cost of pumping

Heat sensitive material can be handled

Most concentrated liquid is at highest temperature

Equal heat transfer co-efficients exist in various effects

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Heat Transfer
The thermal radiation emitted by a body is proportional to Tn, where T is its absolute temperature. The value of 'n' is exactly 4 for

Black painted bodies only

A black body

All bodies

Polished bodies only

Black painted bodies only

A black body

All bodies

Polished bodies only

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Heat Transfer
An equipment which converts the latent or sensible heat of one fluid into the latent heat of vaporisation of another, is called a

boiler

regenerator

recuperator

heat exchanger

boiler

regenerator

recuperator

heat exchanger

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Heat Transfer
Thermal conductivities of most of the liquids __________ with rise in temperature.

May increase or decrease; depends on the liquid

Remains unchanged

Increases

Decreases

May increase or decrease; depends on the liquid

Remains unchanged

Increases

Decreases

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Heat Transfer
The statement that "maximum wavelength of radiation is inversly proportional to the temperature" is __________ law.

None of these

Wien's displacement

Stefan-Boltzman's

Planck's

None of these

Wien's displacement

Stefan-Boltzman's

Planck's

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Heat Transfer

Heat Transfer The advantage of backward feed multiple effect evaporators over forward feed units is that

Heat Transfer The thermal radiation emitted by a body is proportional to Tn, where T is its absolute temperature. The value of 'n' is exactly 4 for

Heat Transfer An equipment which converts the latent or sensible heat of one fluid into the latent heat of vaporisation of another, is called a

Heat Transfer Thermal conductivities of most of the liquids __________ with rise in temperature.

Heat Transfer The statement that "maximum wavelength of radiation is inversly proportional to the temperature" is __________ law.

Heat Transfer
The advantage of backward feed multiple effect evaporators over forward feed units is that

Heat Transfer
The thermal radiation emitted by a body is proportional to Tn, where T is its absolute temperature. The value of 'n' is exactly 4 for

Heat Transfer
An equipment which converts the latent or sensible heat of one fluid into the latent heat of vaporisation of another, is called a

Heat Transfer
Thermal conductivities of most of the liquids __________ with rise in temperature.

Heat Transfer
The statement that "maximum wavelength of radiation is inversly proportional to the temperature" is __________ law.