Mechanical Engineering MCQs

Page No. 104

According to first law of thermodynamics_______________________?


amass and energy are mutually convertible

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bCarnot engine is most efficient

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cheat and work are mutually convertible

✓


dmass and light are mutually convertible

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First law of thermodynamics___________________?


aenables to determine change in internal energy of the system

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

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cdoes not enable to determine change in entropy

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dall of the above

✓


View Answer all of the above

Carnot cycle has maximum efficiency for__________________?


areversible engine

✓


birreversible engine

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cnew engine

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dpetrol engine

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View Answer reversible engine

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


aprocess is thermodynamically in equilibrium

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bprocess is executed in closed system cycle

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cits entropy will change due to irreversibility

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dsum of heat and work transfer will be zero

✓



Carnot cycle efficiency depends upon________________?


aproperties of the medium/substance used

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bcondition of engine

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cworking condition

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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

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c625°K

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d700°K

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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

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bnot possible

✓


cmay be possible with lot of sophistications

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dcost will be very high

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View Answer not possible

A diathermic wall is one which____________________?


aprevents thermal interaction

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bpermits thermal interaction

✓


cencourages thermal interaction

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ddiscourages thermal interaction

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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.

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bThe room will be cooled very slightly.

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cThe room will be gradually warmed up.

✓


dThe temperature of the air in room will remain unaffected.

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


aat atmospheric pressure

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bat a pressure below the firuosphejric pressure

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cat a pressure greater than atmospheric pressure

✓


dany pressure

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