Mechanical Engineering MCQs

Page No. 189

Standard air is the air at_____________________?


aatmospheric conditions at any specific location


b20°C and 1 kg/cm2 and relative humidity 36%


c0°C and standard atmospheric conditions


d15°C and 1 kg/cm2



Maximum work is done in compressing air when the compression is_________________?


aisothermal


badiabatic


cpolytropic


dany one of the above


View Answer adiabatic

The capacity of a compressor is 5 m /mih. 5 m /min refers to_______________?


astandard air


bfree air


ccompressed air


dcompressed air at delivery pressure


View Answer free air

Free air is the air at________________?


aatmospheric conditions at any specific location


b20°C and 1 kg/cm2 and relative humidity of 36%


c0°C and standard atmospheric conditions


d15°C and 1 kg/cm2



1 m of air at atmospheric condition weighs approximately__________________?


a0.5 kg


b1.0 kg


c1.3 kg


d2.2 kg


View Answer 1.3 kg

The overall isothermal eiffciency of compressor is defined as the ratio of_______________?


aisothermal h.p. to the BHP of motor


bisothermal h.p. to adiabatic h.p.


cpower to drive compressor to isothermal h.p.


dwork to compress air isothermally to work for actual compression



The pressure and temperature conditions of air at the suction of compressor are_________________?


aatmospheric


bslightly more than atmospheric


cslightly less than atmospheric


dpressure sightly less than atmospheric and temperature slightly more than atmospheric



Isothermal compression efficiency, even when running at high speed, can be approached by using A. multi-stage compression B. cold water spray C. both A. and B. above D. fully insulating the cylinder E. high stroke_________________?


amulti-stage compression


bcold water spray


cboth A. and B. above


dfully insulating the cylinder


View Answer both A. and B. above

Isothermal compression effeicency can be attained by running the compressor__________________?


aat very high speed


bat very slow speed


cat average speed


dat zero speed


View Answer at very slow speed

The- most efficient method of compressing air is to compress it_________________?


aisothermally


badiabatically


cisentropically


disochronically


View Answer isothermally

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