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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

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
The time oscillation of a floating body with increase in metacentric height will be_________________?
A same
B higher
C lower
D lower/higher depending on weight of body
Correct Answer: lower
Differential monometer is used to measure___________________?
A pressure in pipes, channels etc.
B atmospheric pressure
C very low pressure
D difference of pressure between two points
Correct Answer: difference of pressure between two points
Resultant pressure of the liquid in the case of an immersed body acts through____________________?
A centre of gravity
B centre of pressure
C metacentre
D centre of buoyancy
Correct Answer: centre of pressure
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