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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 velocity of jet of water travelling out of opening in a tank filled with water is proportional to_________________?
A head of water (h)
B h2
C V/T
D h2
Correct Answer: V/T
A piece of metal of specific gravity 7 floats in mercury of specific gravity 13.6. What fraction of its volume is under mercury ?
A 0.5
B 0.4
C 0.515
D 0.5
Correct Answer: 0.5
A streamline is defined as the line________________?
A parallel to central axis flow
B parallel to outer surface of pipe
C of equal yelocity in a flow
D along which the pressure drop is uniform
Correct Answer: of equal yelocity in a flow
Flow occurring in a pipeline when a valve is being opened is________________?
A steady
B unsteady
C laminar
D vortex
Correct Answer: steady
The flow in which the velocity vector is identical in magnitude and direction at every point, for any given instant, is known as________________?
A one dimensional flow
B uniform flow
C steady flow
D turbulent flow
Correct Answer: uniform flow
Steady flow occurs when___________________?
A the direction and magnitude of the velocity at all points are identical
B the velocity of successive fluid particles, at any point, is the same at successive periods of time
C the magnitude and direction of the velocity do not change from point to point in the fluid
D the fluid particles move in plane or parallel planes and the streamline pat-terns are identical in each plane
Correct Answer: the velocity of successive fluid particles, at any point, is the same at successive periods of time
Uniform flow occurs when ___________________?
A the flow is steady
B the flow is streamline
C size and shape of the cross section in a particular length remain constant
D size and cross section change uniformly along length
Correct Answer: size and shape of the cross section in a particular length remain constant
An ideal flow of any fluid must satisfy __________________?
A Pascal law
B Newton’s law of viscosity
C boundary layer theory
D continuity equation
Correct Answer: continuity equation
Flow of water in a pipe about 3 metres in diameter can be measured by__________________?
A orifice plate
B venturi
C rotameter
D pitot tube
Correct Answer: pitot tube
The normal stress is same in all directions at a point in a fluid_______________?
A only when the fluid is frictionless
B only when the fluid is incompressible and has zero viscosity
C when there is no motion of one fluid layer relative to an adjacent layer
D irrespective of the motion of one fluid layer relative to an adjacent layer
Correct Answer: when there is no motion of one fluid layer relative to an adjacent layer
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