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Mechanical Engineering Mcqs 1919 MCQs [All-Courses]

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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.

All Topics  1919

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
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
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
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
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
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
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
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
Correct Answer: axial component
A compressor at high altitude will draw________________?
A more power
B less power
C same power
D more/less power depending on other factors
Correct Answer: less power
A centrifugal compressor works on the principle of__________________?
A conversion of pressure energy into kinetic energy
B conversion of kinetic energy into pres¬sure energy
C centripetal action
D generating pressure directly
Correct Answer: conversion of kinetic energy into pres¬sure energy
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