Chemical Engineering MCQs

Page No. 467

At constant temperature, the thermal conductivities of gases _____________ with rise in pressure?


aDecrease

✓


bIncrease

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cRemain unchanged

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dMay increase or decrease; depends on the pressure

✖


View Answer Decrease

A single pass air heater is connected to a two pass unit. For the air flow rate and other conditions remaining the same, the film heat transfer co-efficient for air will vary in the ratio of__________________?


a2

✖


b20.8

✓


c20.2

✖


d20.5

✖


View Answer 20.8

It is not preferable to use superheated steam in evaporators, because of its very_________________?


aHigh temperature

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bHigh pressure

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cLow film co-efficient

✓


dNone of these

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View Answer Low film co-efficient

_____________ heat exchanger is used for chilling oil to be dewaxed?


aU-tube

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bDouble pipe

✓


cFixed tube

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dFloating head

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View Answer Double pipe

If heat transfer rate varies with the time, it is termed as__________________?


aForced convection

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bSteady state conduction

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cMonochromatic radiation

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dNone of these

✓


View Answer None of these

The inner wall of a furnace is at a temperature of 700°C. The composite wall is made of two substances, 10 and 20 cm thick with thermal conductivities of 0.05 and 0.1 W.m-1.°C- 1 respectively. The ambient air is at 30°C and the heat transfer co-efficient between the outer surface of wall and air is 20 W.m-2.°C-1. The rate of heat loss from the outer surface in W.m-2is__________________?


a165.4

✓


b167.5

✖


c172.5

✖


d175

✖


View Answer 165.4

The absorptivity of a body is equal to its emissivity _________________?


aAt a particular temperature

✖


bFor circular bodies

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cUnder thermal equilibrium

✓


dNone of these

✖



A perfect black body is a perfect _____________ of radiation?


aAbsorber

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bEmitter

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cBoth A. & B.

✓


dNeither A. nor B.

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View Answer Both A. & B.

jH factor for heat transfer depends upon the ____________ number?


aBiot

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bNusselt

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cReynolds

✓


dPrandtl

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View Answer Reynolds

The actual temperature drop across the heating surface of an evaporator depends on the_______________?


aLiquid depth over the heating surface

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bSolution being evaporated

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cPressure difference between the steam chest and the vapor space above the boiling liquid

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dAll A., B. and C.

✓


View Answer All A., B. and C.

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