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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.

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

The value of the product of molecular weight and the gas characteristic constant for all the gases in S.I. units is________________?

A 29.27 J/kmol°K

B 83.14J/kmol°K

C 848J/kmol°K

D All J/kmol °K

Review Detailed Answer

Correct Answer: 83.14J/kmol°K

On volume basis, air contains following parts of oxygen _____________________?

A 21

B 23

C 25

D 77

Review Detailed Answer

Correct Answer: 21

In a non-flow reversible process for which p = (- 3V+ 15) x 105N/m2,V changes from 1 m to 2 m3. The work done will be about_______________?

A 100 xlOO5 joules

B lxlO5 joules

C 10 xlO5 joules

D 10 xlO5 kilo joules

Review Detailed Answer

Correct Answer: 10 xlO5 joules

Work done is zero for the following process_________________?

A constant volume

B free expansion

C throttling

D all Of the above

Review Detailed Answer

Correct Answer: all Of the above

The basis for measuring thermodynamic property of temperature is given by___________________?

A zeroth law of thermodynamics

B first law of thermodynamics

C second law of thermodynamics

D third law of thermodynamics

Review Detailed Answer

Correct Answer: zeroth law of thermodynamics

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Mechanical Engineering Mcqs 1919 MCQs [All-Courses]

All Topics 1919

All Topics 1919

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___________________?

The value of the product of molecular weight and the gas characteristic constant for all the gases in S.I. units is________________?

On volume basis, air contains following parts of oxygen _____________________?

In a non-flow reversible process for which p = (- 3V+ 15) x 105N/m2,V changes from 1 m to 2 m3. The work done will be about_______________?

Work done is zero for the following process_________________?

The basis for measuring thermodynamic property of temperature is given by___________________?