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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.

Maximum delivery pressure is a rotary air compressor is of the order of__________________?

A 6 kg/cm2

B 10 kg/cm2

C 16 kg/cm2

D 25 kg/cm2

Review Detailed Answer

Correct Answer: 10 kg/cm2

The thermodynamic efficiency of rotary compressor is based on_______________?

A isothermal compression

B adiabatic compression

C isentropic compression

D polytropic compression

Review Detailed Answer

Correct Answer: adiabatic compression

Surging is the phenomenon of___________________?

A air stream blocking the passage

B motion of air at sonic velocity

C unsteady, periodic and reversed flow

D air stream not able to follow the blade contour

Review Detailed Answer

Correct Answer: unsteady, periodic and reversed flow

The maximum compression ratio in an actual single stage axial flow comperssor is of the order of________________?

A 1 : 1.2

B 1 : 2

C 1 : 5

D 1 : 10

Review Detailed Answer

Correct Answer: 1 : 1.2

The ratio of isentropic work to euler’s work is known as _____________________?

A compressor efficiency

B isentropic efficiency

C Euler’s efficiency

D pressure coefficient

Review Detailed Answer

Correct Answer: pressure coefficient

The ratio of outlet whirl velocity to blade velocity in case of centrifugal compressor is called__________________?

A slip factor

B velocity factor

C velocity coefficient

D blade effectiveness

Review Detailed Answer

Correct Answer: slip factor

More than one stage will be preferred for reciprocating compressor if the delivery pressure is more than____________________?

A 2 kg/cm2

B 6 kg/cm2

C 10 kg/cm2

D 14.7 kg/cm2

Review Detailed Answer

Correct Answer: 2 kg/cm2

Pick up the wrong statement about advantages of multistage compression____________________?

A better lubrication is possible advantages of multistage

B more loss of air due to leakage past the cylinder

C mechanical balance is better

D air can be cooled perfectly in between

Review Detailed Answer

Correct Answer: more loss of air due to leakage past the cylinder

Losses in a centrifugal compressor are due to__________________?

A inlet losses

B impeller channel losses

C diffuser losses

D all of the above

Review Detailed Answer

Correct Answer: all of the above

For a two stage compressor* if index of compression for higher stage is greater than index of compression for lower stage, then the optimum pressure as compared to ideal case will___________________?

A increase

B decrease

C remain unaffected

D other factors control it

Review Detailed Answer

Correct Answer: increase

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Mechanical Engineering Mcqs 1919 MCQs [All-Courses]

All Topics 1919

All Topics 1919

Maximum delivery pressure is a rotary air compressor is of the order of__________________?

The thermodynamic efficiency of rotary compressor is based on_______________?

Surging is the phenomenon of___________________?

The maximum compression ratio in an actual single stage axial flow comperssor is of the order of________________?

The ratio of isentropic work to euler’s work is known as _____________________?

The ratio of outlet whirl velocity to blade velocity in case of centrifugal compressor is called__________________?

More than one stage will be preferred for reciprocating compressor if the delivery pressure is more than____________________?

Pick up the wrong statement about advantages of multistage compression____________________?

Losses in a centrifugal compressor are due to__________________?

For a two stage compressor* if index of compression for higher stage is greater than index of compression for lower stage, then the optimum pressure as compared to ideal case will___________________?