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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 torsional rigidity of a shaft is expressed by the_______________?
A maximum torque it can transmit
B number of cycles it undergoes before failure
C elastic limit up to which it resists torsion, shear and bending stresses
D torque required to produce a twist of one radian per unit length of shaft
Correct Answer: torque required to produce a twist of one radian per unit length of shaft
A key is subjected to side pressure as well at shearing forces. These pressures are called_________________?
A bearing stresses
B fatigue stresses
C crushing stresses
D resultant stresses
Correct Answer: bearing stresses
A projectile is fired at an angle 9 to the vertical. Its horizontal range will be maximum when 9 is__________________?
A 0°
B 30°
C 45°
D 60°
Correct Answer: 45°
Coulomb friction is the friction between_____________________?
A bodies having relative motion
B two dry surfaces
C two lubricated surfaces
D solids and liquids
Correct Answer: bodies having relative motion
The effort required to lift a load W on a screw jack with helix angle a and angle of friction <j) is equal to__________________?
A Wtan(a + )
B Wtan(a-)
C Wcos(a + )
D Wsin(a + )
Correct Answer: Wtan(a + )
A particle inside a hollow sphere of radius r, having coefficient of friction -rr can rest upto height of___________________?
A r/2
B r/A
C r/%
D 0.134 r
Correct Answer: 0.134 r
A single force and a couple acting in the same plane upon a rigid body_________________?
A balance each other
B cannot balance each other
C produce moment of a couple
D are equivalent
Correct Answer: balance each other
The maximum frictional force which comes into play when a body just begins to slide over another surface is called________________?
A limiting friction
B sliding friction
C rolling friction
D kinematic friction
Correct Answer: limiting friction
The necessary condition for forces to be in equilibrium is that these should be_____________________?
A coplanar
B meet at one point ;
C both A. and B. above
D all be equal
Correct Answer: both A. and B. above
A flywheel on a motor goes from rest to 1000 rpm in 6 sec. The number of revolutions made is nearly equal to_________________?
A 25
B 50
C 100
D 250
Correct Answer: 50
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