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Heat Transfer

Heat Transfer
Electromagnetic radiations propagate in vacuum with a velocity of __________ metre/second.

3 x l05
3 x l010
3 x l012
3 x l08

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Heat Transfer
Grashoff number, which is defined as g . β(Ts - T∞) ρ². L³/μ², is proportional to the ratio of buoyancy force to __________ force.

Inertial
Viscous
Elastic
None of these

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Heat Transfer
Hot water (0.01 m³ /min) enters the tube side of a counter current shell and tube heat exchanger at 80°C and leaves at 50°C. Cold oil (0.05 m³/min) of density 800 kg/m³ and specific heat of 2 kJ/kg.K enters at 20°C. The log mean temperature difference in °C is approximately

37
50
32
45

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Heat Transfer
Corrosiveness of steam condensate is due to the presence of

Dissolved O₂
Both A & B
CO₂
Neither A nor B

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Heat Transfer
If the baffle spacing in a shell and tube heat exchanger increases, then the Reynolds number of the shell side fluid

Increases or decreases depending on number of shell passes
Remains unchanged
Decreases
Increases

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Heat Transfer
Kirchoff's law is applicable to

Monochromatic radiation only
Both A and B
Only volumes and not to surfaces
Total radiation only

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