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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.

Which of the following processes is irreversible process___________________?

A isothermal

B adiabatic

C throttling

D all of the above

Review Detailed Answer

Correct Answer: throttling

For a thermodynamic process to be reversible, the temperature difference between hot body and working substance should be___________________?

A zero

B minimum

D infinity

Review Detailed Answer

Correct Answer: zero

Molecular volume of any perfect gas at 600 x 103 N/m2 and 27°C will be ____________________?

A 4.17m3/kgmol

B 400 m3/kg mol

C 0.15 m3/kg mol

D 41.7 m3/kg mol

Review Detailed Answer

Correct Answer: 4.17m3/kgmol

The more effective way of increasing efficiency of Carnot engine is to____________________?

A increase higher temperature

B decrease higher temperature

C increase lower temperature

D decrease lower temperature

Review Detailed Answer

Correct Answer: decrease lower temperature

For reversible adiabatic process, change in entropy is_________________?

A maximum

B minimum

C zero

D unpredictable

Review Detailed Answer

Correct Answer: zero

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

Review Detailed Answer

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

Review Detailed Answer

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

Review Detailed Answer

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

Review Detailed Answer

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

Review Detailed Answer

Correct Answer: reversible engine

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Mechanical Engineering Mcqs 1919 MCQs [All-Courses]

All Topics 1919

All Topics 1919

Which of the following processes is irreversible process___________________?

For a thermodynamic process to be reversible, the temperature difference between hot body and working substance should be___________________?

Molecular volume of any perfect gas at 600 x 103 N/m2 and 27°C will be ____________________?

The more effective way of increasing efficiency of Carnot engine is to____________________?

For reversible adiabatic process, change in entropy is_________________?

According to first law of thermodynamics__________________?

First law of thermodynamics furnishes the relationship between______________________?

In an isothermal process, the internal energy________________?

According to first law of thermodynamics_______________________?

Carnot cycle has maximum efficiency for__________________?