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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

In a mechanism, usually one link is fixed. If the fixed link is changed in a kinematic chain, then relative motion of other links_________________?
A will remain same
B will change
C could change or remain unaltered depending oh which link is fixed
D will not occur
Correct Answer: will remain same
In a darg link quick return mechanism, the shortest link is always fixed. The sum of the shortest and longest link is _______________?
A equal to sum of other two
B greater than sum of other two
C less than sum of other two
D there is no such relationship
Correct Answer: less than sum of other two
Kinematic pairs are those which have___________________?
A two elements held together mechani-cally
B two elements having relative motion
C two elements having Coroili’s com-ponent
D minimum of two instantaneous centres
Correct Answer: two elements having relative motion
In a four-bar chain it is required to give an oscillatory motion to the follower for a continuous rotation of the crank. For the lengths of 50 mm of crank and 70 mm of the follower, determine theoretical maximum length of coupler. The distance between fixed pivots of crank and followers is________________________?
A 95 mm
B slightly less than 95 mm
C slightly more than 95 mm
D 45 mm
Correct Answer: 95 mm
Inertia force acts___________________?
A perpendicular to the accel< force
B along the direction of accel* force
C opposite to the direction of ace ing force
D in any direction w.r.t. accel* force depending on the magnit two
Correct Answer: opposite to the direction of ace ing force
In S.H.M., acceleration is proportional to _________________?
A velocity
B displacement
C rate of change of velocity
D all of the above
Correct Answer: displacement
In S.H.M., the velocity vector w.r.t. displacement vector _________________?
A leads by 90°
B lags by 90°
C leads by 180°
D are in phase
Correct Answer: leads by 90°
Pick up the incorrect statement?
A lithium bromide used in vapour absorption cycle is nonvolatile
B lithium bromide plant can’t operate below 0°C
C a separator is used in lithium bromide plant to remove the unwanted water vapour by condensing
D concentration of solution coming out of lithium bromide generator is more in comparison to that entering the generator
Correct Answer: a separator is used in lithium bromide plant to remove the unwanted water vapour by condensing
Choose the wrong statement ?
A Temperature of medium being cooled must be below that of the evaporator
B Refrigerant leaves the condenser as liquid
C All solar thermally operated absorption systems are capable only of intermittent operation
D frost on evaporator reduces heat transfer
Correct Answer: Temperature of medium being cooled must be below that of the evaporator
Choose the correct statement?
A A refrigerant should have low latent heat
B If operating temperature of system is low, then refrigerant with low boiling point should be used
C Precooling and subcooling bf refrigerant are same
D Superheat and sensible heat of a. refrigerant are same
Correct Answer: If operating temperature of system is low, then refrigerant with low boiling point should be used
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