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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.

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

Zeroth law of thermodynamics________________?

A deals with conversion of mass and energy

B deals with reversibility and irreversibility of process

C states that if two systems are both in equilibrium with a third system, they are in thermal equilibrium with each other

D deals with heat engines

Review Detailed Answer

Correct Answer: states that if two systems are both in equilibrium with a third system, they are in thermal equilibrium with each other

Change in enthalpy of a system is the heat supplied at___________________?

A constant pressure

B constant temperature

C constant volume

D constant entropy

Review Detailed Answer

Correct Answer: constant pressure

If value of n is infinitely large in a polytropic process pV” = C, then the process is known as constant_____________________?

A volume

B pressure

C temperature

D enthalpy

Review Detailed Answer

Correct Answer: volume

A perfect gas at 27°C is heated at constant pressure till its volume is double. The final temperature is________________?

A 54°C

B 327°C

C 108°C

D 654°C

Review Detailed Answer

Correct Answer: 327°C

The value of n = 1 in the poly tropic process indicates it to be __________________?

A reversible process

B isothermal process

C adiabatic process

D irreversible process

Review Detailed Answer

Correct Answer: isothermal process

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Mechanical Engineering Mcqs 1919 MCQs [All-Courses]

All Topics 1919

All Topics 1919

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___________________?

Zeroth law of thermodynamics________________?

Change in enthalpy of a system is the heat supplied at___________________?

If value of n is infinitely large in a polytropic process pV” = C, then the process is known as constant_____________________?

A perfect gas at 27°C is heated at constant pressure till its volume is double. The final temperature is________________?

The value of n = 1 in the poly tropic process indicates it to be __________________?