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Heat and Mass Transfer

Heat and Mass Transfer
If the temperature of a solid surface changes form 27°C to 627°C, then its emissive power changes in the ratio of

3
9
81
270

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

None of these
Same
Less
Greater

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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

None of these
Emissive power
Emissivity
Absorptive power

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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 = 0, x = 0 and a = 1
X = 0, a + p = 1
P=1, x = 0, and a = 0
P = 0, x= 1, and a = 0

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Heat and Mass Transfer
Joule sec is the unit of

Thermal conductivity
Kinematic viscosity
Universal gas constant
Planck's constant

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

K cal/kg m² °C
K calm/hr °C
K cal m/hr m² °C
K cal/hr m² °C

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