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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
In a backward feed multiple effect evaporator

None of these
No pumps are required between successive effects
Feed flows from low pressure to high pressure
Feed is introduced in the first effect

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Heat Transfer
Use of transverse baffles in a shell and tube heat exchanger is done to increase the

All of these
Flow velocity
Rate of heat transfer
Turbulence of shell side fluid

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Heat Transfer
Multiple effect evaporators are commonly used in the manufacture of P. Paper Q. Superphosphate R. Sugar S. Fats

P and R
R and S
P and Q
P and S

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Heat Transfer
Thermal conductivity of a gas at low density, __________ with increase in temperature.

May increase or decrease; depends on the gas
Remains unchanged
Decreases
Increases

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Heat Transfer
Maximum water velocity in tubes of a 1-2 shell and tube heat exchanger may be around __________ metres/second.

1
10
30
20

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