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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

A perpetual motion machine is___________________?
A a thermodynamic machine
B a non-thermodynamic machine
C a hypothetical machine
D a hypothetical machine whose opera-tion would violate the laws of thermodynamics
Correct Answer: a hypothetical machine
According to Clausis statement of second law of thermodynamics___________________?
A heat can’t be transferred from low temperature source to high temperature source
B heat can be transferred for low temperature to high temperature source by using refrigeration cycle.
C heat can be transferred from low temperature to high temperature source if COP of process is more than unity
D heat can’t be transferred from low temperature to high temperature source without the aid of external energy
Correct Answer: heat can’t be transferred from low temperature to high temperature source without the aid of external energy
Diesel cycle consists of following four processes_________________?
A two isothermals and two isentropics
B two isentropics, and two constant volumes.
C two isentropics, one constant volume and one constant pressure
D two isentropics and two constant pressures
Correct Answer: two isentropics, one constant volume and one constant pressure
Stirling and Ericsson cycles are__________________?
A reversible cycles
B irreversible cycles
C quasi-static cycles
D semi-reversible cycles
Correct Answer: reversible cycles
Reversed joule cycle is called_________________?
A Carnot cycle
B Rankine cycle
C Brayton cycle
D Bell Coleman cycle
Correct Answer: Brayton cycle
The efficiency of Diesei cycle with decrease in cut off_________________?
A increases
B decreases
C remains unaffected
D first increases and then decreases
Correct Answer: increases
The thermodynamic difference between a Rankine cycle working with saturated steam and the Carnot cycle is that___________________?
A carnot cycle can’t work with saturated steam
B heat is supplied to water at temperature below the maximum temperature of the cycle
C a rankine cycle receives heat at two places
D rankine cycle is hypothetical
Correct Answer: heat is supplied to water at temperature below the maximum temperature of the cycle
The following cycle is used for air craft refrigeration___________________?
A Brayton cycle
B Joule cycle
C Carnot cycle
D Bell-Coleman cycle
Correct Answer: Brayton cycle
The ideal efficiency of a Brayton cycle without regeneration with increase ni pressure ratio will_________________?
A increase
B decrease
C remain unchanged
D increase/decrease depending on application
Correct Answer: increase
Gas turbine cycle consists of___________________?
A two isothermals and two isentropics
B two isentropics and two constant volumes
C two isentropics, one constant volume and one constant pressure
D two isentropics and two constant pressures
Correct Answer: two isentropics and two constant pressures
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