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Heat Transfer

Heat Transfer
What is the unit of thermal conductivity ?

Kcal/hr. m² °C
Kcal/hr. °C
Kcal/hr.m.°C
Kcal/hr.m

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Heat Transfer
Heat transfer by __________ may not necessarily require the presence of a medium

radiation
natural convection
coduction
none of the listed here

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Heat Transfer
For a fluid flowing in an annulus space, the wetted perimeter for heat transfer and pressure drop are

Never different
Same
Different
Linearly related

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Heat Transfer
The main purpose of providing fins on heat transfer surface is to increase the

Heat transfer area
Heat transfer co-efficient
Mechanical strength of the equipment
Temperature gradient

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Heat Transfer
Vent pipes are provided in a condenser to

Facilitate easy cleaning of tubes
Purge the condenser
None of these
Remove non-condensable gases

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Heat Transfer
The variation of thermal conductivity of a metal with temperature is often correlated using an expression of the form K = K₀ + at. where, K is the thermal conductivity and T is the temperature (in °K). The units of 'a' in SI system will be

None, A is just a number
W/m.k
W/m.k²
W/m

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