Mechanical Engineering MCQs

Page No. 104

According to first law of thermodynamics_______________________?


amass and energy are mutually convertible


bCarnot engine is most efficient


cheat and work are mutually convertible


dmass and light are mutually convertible



First law of thermodynamics___________________?


aenables to determine change in internal energy of the system


bdoes not help to predict whether the system will or not undergo a change


cdoes not enable to determine change in entropy


dall of the above


View Answer all of the above

Carnot cycle has maximum efficiency for__________________?


areversible engine


birreversible engine


cnew engine


dpetrol engine


View Answer reversible engine

If a system after undergoing a series of processes, returns to the initial state then__________________?


aprocess is thermodynamically in equilibrium


bprocess is executed in closed system cycle


cits entropy will change due to irreversibility


dsum of heat and work transfer will be zero



Carnot cycle efficiency depends upon________________?


aproperties of the medium/substance used


bcondition of engine


cworking condition


dtemperature range of operation



An engine operates between temperatures of 900°Kandr2 and another engine between T2 and 400°K For both to do equal work, value of T2 will be________________?


a650°K


b600°K


c625°K


d700°K


View Answer 650°K

A manufacturer claims to have a heat engine capable of developing 20 h.p. by receiving heat input of 400 kcal/mt and working between the temperature limits of 227° C and 27° C. His claim is__________________?


ajustified


bnot possible


cmay be possible with lot of sophistications


dcost will be very high


View Answer not possible

A diathermic wall is one which____________________?


aprevents thermal interaction


bpermits thermal interaction


cencourages thermal interaction


ddiscourages thermal interaction



The door of a running refrigerator inside a room was left open____________________? Which of the following statements is correct ?


aThe room will be cooled to the temperature inside the refrigerator.


bThe room will be cooled very slightly.


cThe room will be gradually warmed up.


dThe temperature of the air in room will remain unaffected.



Water contained in a beaker can be made to boil by passing steam through it__________________?


aat atmospheric pressure


bat a pressure below the firuosphejric pressure


cat a pressure greater than atmospheric pressure


dany pressure



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