Mechanical Engineering MCQs

Page No. 106

Stirling and Ericsson cycles are__________________?


areversible cycles

✓


birreversible cycles

✖


cquasi-static cycles

✖


dsemi-reversible cycles

✖


View Answer reversible cycles

Reversed joule cycle is called_________________?


aCarnot cycle

✖


bRankine cycle

✖


cBrayton cycle

✓


dBell Coleman cycle

✖


View Answer Brayton cycle

Which of the following cycles is not a reversible cycle_____________________?


aCarnot

✖


bEricsson

✖


cStirling

✖


dnone of the above

✓


View Answer none of the above

The efficiency of Diesei cycle with decrease in cut off_________________?


aincreases

✓


bdecreases

✖


cremains unaffected

✖


dfirst increases and then decreases

✖


View Answer increases

The thermodynamic difference between a Rankine cycle working with saturated steam and the Carnot cycle is that___________________?


acarnot cycle can’t work with saturated steam

✖


bheat is supplied to water at temperature below the maximum temperature of the cycle

✓


ca rankine cycle receives heat at two places

✖


drankine cycle is hypothetical

✖



The following cycle is used for air craft refrigeration___________________?


aBrayton cycle

✖


bJoule cycle

✖


cCarnot cycle

✖


dReversed-Brayton cycle

✓



The ideal efficiency of a Brayton cycle without regeneration with increase ni pressure ratio will_________________?


aincrease

✓


bdecrease

✖


cremain unchanged

✖


dincrease/decrease depending on application

✖


View Answer increase

Gas turbine cycle consists of___________________?


atwo isothermals and two isentropics

✖


btwo isentropics and two constant volumes

✖


ctwo isentropics, one constant volume and one constant pressure

✖


dtwo isentropics and two constant pressures

✓



The ideal efficiency of a Brayton cycle with regeneration, with increase in pressure ratio will______________?


aincrease

✖


bdecrease

✓


cremain unchanged

✖


dincrease/decrease depending on ap-plication

✖


View Answer decrease

Which of the following cycles has maximum efficiency_____________?


aRankine

✖


bStirling

✖


cCarnot

✓


dBrayton

✖


View Answer Carnot

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