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Mechanical Engineering Mcqs 1919 MCQs [All-Courses]

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.

Change in internal energy in a closed system is equal to heat transferred if the reversible process takes place at constant_______________?

A pressure

B temperature

C volume

D internal energy

Review Detailed Answer

Correct Answer: volume

Isochoric process is one in which___________________?

A free expansion takes place

B very little mechanical work is done by the system

C no mechanical work is done by the system

D all parameters remain constant

Review Detailed Answer

Correct Answer: no mechanical work is done by the system

Change in enthalpy in a closed system is equal to heat transferred if the reversible process takes place at constant________________?

A pressure

B temperature

C volume

D internal energy

Review Detailed Answer

Correct Answer: pressure

Energy can neither be created nor destroyed but can be converted from one form to other is inferred from_________________?

A zeroth low of thermodynamic

B first law of thermodynamics

C second law to thermodynamics

D basic law of thermodynamics

Review Detailed Answer

Correct Answer: first law of thermodynamics

Entropy change depends on___________________?

A heat transfer

B mass transfer

C change of temperature

D thermodynamic state

Review Detailed Answer

Correct Answer: heat transfer

A gas is compressed in a cylinder by a movable piston to a volume one-half its original volume. During the process 300 kJ heat left the gas and internal energy remained same. The work done on gas in Nm will be___________________?

A 300 Nm

B 300,000 Nm

C 30 Nm

D 3000 Nm

Review Detailed Answer

Correct Answer: 300,000 Nm

Minimum work in compressor is possible when the value of adiabatic index n is equal to_________________?

A 0.75

B 1

C 1.27

D 1.35

Review Detailed Answer

Correct Answer: 1

In order that a cycle be reversible, following must be satisfied ________________?

A free expansion or friction resisted expansion/compression process should not be encountered

B when heat is being absorbed, temperature of hot source and working sub¬stance should be same

C when beat is being rejected, temperature of cold source and working sub-stance should be same

D all of the above

Review Detailed Answer

Correct Answer: all of the above

The specific heat of air increases with increase in __________________?

A temperature

B pressure

C both pressure and temperature

D variation of its constituents

Review Detailed Answer

Correct Answer: temperature

In a free expansion process___________________?

A work done is zero

B heat transfer is zero

C both A. and B. above

D work done is zero but heat increases

Review Detailed Answer

Correct Answer: both A. and B. above

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Mechanical Engineering Mcqs 1919 MCQs [All-Courses]

All Topics 1919

All Topics 1919

Change in internal energy in a closed system is equal to heat transferred if the reversible process takes place at constant_______________?

Isochoric process is one in which___________________?

Change in enthalpy in a closed system is equal to heat transferred if the reversible process takes place at constant________________?

Energy can neither be created nor destroyed but can be converted from one form to other is inferred from_________________?

Entropy change depends on___________________?

A gas is compressed in a cylinder by a movable piston to a volume one-half its original volume. During the process 300 kJ heat left the gas and internal energy remained same. The work done on gas in Nm will be___________________?

Minimum work in compressor is possible when the value of adiabatic index n is equal to_________________?

In order that a cycle be reversible, following must be satisfied ________________?

The specific heat of air increases with increase in __________________?

In a free expansion process___________________?