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Mechanical Engineering Mcqs 1919 MCQs [All-Courses]

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Mechanical Engineering MCQs prepared for job test and interview preparation, especially for fresh graduates, students, and candidates appearing in competitive exams. These multiple-choice questions cover key topics such as Machine Design, Theory of Machines, Hydraulic Machines, and other important mechanical engineering concepts.

All Topics  1919

According to first law of thermodynamics__________________?
A work done by a system is equal to heat transferred by the system
B total internal energy of a system during a process remains constant
C internal energy, enthalpy and entropy during a process remain constant
D total energy of a system remains constant
Correct Answer: total energy of a system remains constant
First law of thermodynamics furnishes the relationship between______________________?
A heat and work
B heat, work and properties of the system
C various properties of the system
D various thermodynamic processes
Correct Answer: heat, work and properties of the system
In an isothermal process, the internal energy________________?
A increases
B decreases
C remains constant
D first increases and then decreases
Correct Answer: remains constant
According to first law of thermodynamics_______________________?
A mass and energy are mutually convertible
B Carnot engine is most efficient
C heat and work are mutually convertible
D mass and light are mutually convertible
Correct Answer: heat and work are mutually convertible
Carnot cycle has maximum efficiency for__________________?
A reversible engine
B irreversible engine
C new engine
D petrol engine
Correct Answer: reversible engine
If a system after undergoing a series of processes, returns to the initial state then__________________?
A process is thermodynamically in equilibrium
B process is executed in closed system cycle
C its entropy will change due to irreversibility
D sum of heat and work transfer will be zero
Correct Answer: sum of heat and work transfer will be zero
Carnot cycle efficiency depends upon________________?
A properties of the medium/substance used
B condition of engine
C working condition
D temperature range of operation
Correct Answer: temperature 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________________?
A 650°K
B 600°K
C 625°K
D 700°K
Correct 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__________________?
A justified
B not possible
C may be possible with lot of sophistications
D cost will be very high
Correct Answer: not possible
A diathermic wall is one which____________________?
A prevents thermal interaction
B permits thermal interaction
C encourages thermal interaction
D discourages thermal interaction
Correct Answer: permits thermal interaction
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