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Heat Transfer

Heat Transfer
1 BTU/hr.ft.°F is equal to __________ kcal/hr. m.°C.

None of these
1
1.49
4.88

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Heat Transfer
LMTD correction factor which is to be applied for a cross-flow heat exchanger increases with increase in the number of shell passes. Its value for a single pass cross flow heat exchanger is

1
>1
<1
Zero

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Heat Transfer
The separation of liquid droplets from the vapor is done by a/an __________ , in the evaporators.

Entrainment separator
Vacuum pump
Compressor
Steam ejector

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Heat Transfer
Peclet number (Pe) is given by

Pe = Re.Pr
Pe = Nu.Re
Pe = Pr/Re
Pe = Re/Pr

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Heat Transfer
The ratio of total radiating power to the absorptivity of the body depends upon the __________ as per Kirchoffs law.

None of these
Nature of the body
Wavelength of radiation
Temperature of the body

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Heat Transfer
At constant temperature, the thermal conductivities of gases __________ with rise in pressure.

Remain unchanged
May increase or decrease; depends on the pressure
Decrease
Increase

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