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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 volumetric efficiency of a compressor falls roughly as follows for every 100 m increase in elevation___________________?

A 0.1%

B 0.5%

C 1.0%

D 5%

Review Detailed Answer

Correct Answer: 1.0%

During base load operation, the best method of controlling compressor is ___________________?

A start-stop motor

B constant speed unloader

C relief valve

D variable speed

Review Detailed Answer

Correct Answer: start-stop motor

The volumetirc efficiency of a compressor is calculated on the basis of __________________?

A volume of air inhaled at working conditions

B volume of air inhaled at N.T.P. conditions

C volume at 0°C and 1 kg/cm2

D volume at 20°C and 1 kg/cm2

Review Detailed Answer

Correct Answer: volume of air inhaled at N.T.P. conditions

For slow-speed large capacity compressor, following type of valve will be best suited________________?

A poppet valve

B mechanical valve of the corliss, sleeve, rotary or semirotary type

C disc or feather type

D any of the above

Review Detailed Answer

Correct Answer: disc or feather type

The compressor efficiecny is the__________________?

A isothermal H.P/indicated H.R

B isothermal H.P./shaft H.R

C total output/air input

D compression work/motor input

Review Detailed Answer

Correct Answer: isothermal H.P/indicated H.R

For a compressor, least work will be done if the compression is________________ ?

A isentropic

B isothermal

C polytropic

D somewhere in between isentropic and isothermal

Review Detailed Answer

Correct Answer: isothermal

To avoid moisture troubles, the branch connections from compressed air lines should be taken from_________________?

A top side of main

B bottom side of main

C left side of main

D right side of main

Review Detailed Answer

Correct Answer: top side of main

To aviod moisture troubles, the compressed air main line should __________________?

A rise gradually towards the point of use

B drop gradually towards the point of use

C be laid vertically

D be laid exactly horizontally

Review Detailed Answer

Correct Answer: drop gradually towards the point of use

The area of actual indicator diagram on an air compressor as compared to area of ideal indicator diagram is_____________________?

A less

B more

C same

D more/less depending on compressor capacity

Review Detailed Answer

Correct Answer: more

The thrust on the rotor in a centrifugal compressor is produced by________________?

A radial component

B axial component

C tangential component

D resultant component

Review Detailed Answer

Correct Answer: axial component

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Mechanical Engineering Mcqs 1919 MCQs [All-Courses]

All Topics 1919

All Topics 1919

The volumetric efficiency of a compressor falls roughly as follows for every 100 m increase in elevation___________________?

During base load operation, the best method of controlling compressor is ___________________?

The volumetirc efficiency of a compressor is calculated on the basis of __________________?

For slow-speed large capacity compressor, following type of valve will be best suited________________?

The compressor efficiecny is the__________________?

For a compressor, least work will be done if the compression is________________ ?

To avoid moisture troubles, the branch connections from compressed air lines should be taken from_________________?

To aviod moisture troubles, the compressed air main line should __________________?

The area of actual indicator diagram on an air compressor as compared to area of ideal indicator diagram is_____________________?

The thrust on the rotor in a centrifugal compressor is produced by________________?