Mechanical Engineering MCQs

Page No. 17

Water tube boilers are those in which________________?


aflue gases pass through tubes and water around it

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bwater passes through the tubes and flue gases around it

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cwork is done during adiabatic expansion

✓


dchange in enthalpy

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Steam engine operates on_________________?


acarnot cycle

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bjoule cycle

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cStirling cycle

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dbrayton cycle

✓


View Answer brayton cycle

The lenght of Cornish boiler is of the order of _________________?


a2-4 m

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b3-5 m

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c5-7.5 m

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d7-9 m

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View Answer 5-7.5 m

For burning 1 kg of carbon to CO as per chemically correct combusiton, amount of air required is___________________?


a1 kg

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b4/3kg

✓


c8/3kg

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d2 kg

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View Answer 4/3kg

Which of the following gases has the highest calorific value ________________?


aproducer gas

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bcoal gas

✓


cwater gas

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dblast furnace gas

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View Answer coal gas

Efficiency of a thermal cycle increases by ________________?


aregeneration

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breheating of steam

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cboth A. and B.

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dcooling of steam

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View Answer both A. and B.

Efficiency of rankine cycle can be increased by_________________?


adecreasing initial steam pressure and temperature

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bincreasing exhaust pressure

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cdecreasing exhaust pressure

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dincreasing the expansion ratio

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Alkaline pyrogallate is used in Orsat’s apparatus for absorption of _________________?


aC02

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bCO

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c02

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dN2

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View Answer 02

Hygrometery deals with the_________________?


aHygroscopic substances

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bwater vapour in air

✓


ctemperature of air

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dpressure of air

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View Answer water vapour in air

The increase in pressure _________________?


alowers the boiling point of a liquid

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braises the boiling point of a liquid

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cdoes not affect the boiling point of a liquid

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dreduces its volume

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