Mechanical Engineering MCQs

Page No. 18

Equivalent evaporation of water is the evaporation “for a feed water supply at 100°C__________________?


aand its corresponding conversion into dry saturated steam at 100°C and 1.033 kg/cm2


band its corresponding conversion into dry steam at desired boiler pressure


cconversion into steam at atmospheric condition


dconversion into steam at the same pres-sure at which feed water is supplied



Water boils when its vapour pressure ___________________?


aequals that of the surroundings


bequals 760 mm of mercury


cequals to atmospheric pressure


dequals the pressure of water in the container



The state of vapour under saturation condition is described by_______________?


apressure alone


btemperature alone


cpressure and temperature


dpressure and dryness fraction



Heating wet steam at constant temperature is heating it at constant_________________?


avolume


bpressure


centropy


denthalpy


View Answer pressure

In an experiment to determine dryness fraction of steam, the mass of water separated was 1.2 kg in 15 mts and the mass of steam passed out in same time was 4.8 kg. Dryness fraction is__________________?


a40%


b25%


c50%


d80%


View Answer 80%

At critical point, i.e. p=225.65 kg/cm2, the latent enthalpy of vaporisation is______________?


amaximum


bminimum


czero


ddepends on temperature also


View Answer zero

Latent heat of dry steam at atmospneric pressure is equal to____________________?


a539 kcal/kg


b539 BTU/lb


c427 kcal/kg


d100 kcal/kg


View Answer 539 kcal/kg

In a throttling process_________________?


aheat transfer takes place


bwork is done by the expanding steam


cinternal energy of steam changes


dnone of the above


View Answer none of the above

The dry saturated steam at very high pressure (150-200 kg/cm2) when throttled to atmosphere will become_______________?


awet


bsuperheated


cremain dry saturated


ddry


View Answer wet

The dry saturated steam at very low pressure, (5-10 kg/cm2) when throttled to atmosphere will become________________?


awet


bsuperheated


cremain dry satruated


ddry


View Answer superheated

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