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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 region between the separation streamline and the boundary surface of the solid body is known as__________________?
A wake
B drag
C lift
D boundary layer
Correct Answer: wake
The upper surface of a weir over which water flows is known is_____________________?
A crest
B nappe
C sill
D weir top
Correct Answer: sill
Uniform flow occurs when_____________________?
A the direction and magnitude of the velocity at all points are identical
B the velocity of successive fluid paiticles, 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 pleasure
Correct Answer: the magnitude and direction of the velocity do not change from point to point in the fluid
Hydrometer is used to determine____________________?
A specific gravity of liquids
B specific gravity of solids
C specific gravity of gases
D relative humidity
Correct Answer: specific gravity of liquids
According to Bernoulli’s equation for steady ideal fluid flow____________________?
A principle of conservation of mass holds
B velocity and pressure are inversely proportional
C total energy is constant throughout
D the energy is constant along a stream-line but may vary across streamlines
Correct Answer: the energy is constant along a stream-line but may vary across streamlines
Mach number is significant in_____________________?
A supersonics, as with projectiles and jet propulsion
B full immersion or completely enclosed flow, as with pipes, aircraft wings, nozzles etc.
C simultaneous motion through two fluids where there is a surface of dis-continuity, gravity force, and wave making effects, as with ship’s hulls
D all of fhe above
Correct Answer: supersonics, as with projectiles and jet propulsion
Two pipe systems can be said to be equivalent, when the following quantities are same__________________?
A friction loss and flow
B length and diameter
C flow and length
D friction factor and diameter
Correct Answer: friction loss and flow
Bernoulli equation deals with the law of conservation of__________________?
A mass
B momentum
C energy
D work
Correct Answer: energy
For similarity, in addition to models being geometrically similar to prototype, the following in both cases should also be equal____________________?
A ratio of inertial force to force due to viscosity
B ratio of inertial force to force due to gravitation
C ratio of inertial force to force due to surface tension
D all the four ratios of inertial force to force due to viscosity, gravitation, sur-face tension, and elasticity
Correct Answer: all the four ratios of inertial force to force due to viscosity, gravitation, sur-face tension, and elasticity
Cavitation will begin when__________________?
A the pressure at any location reaches an absolute pressure equal to the saturated vapour pressure of the liquid
B pressure becomes more than critical pressure
C flow is increased
D pressure is increased
Correct Answer: the pressure at any location reaches an absolute pressure equal to the saturated vapour pressure of the liquid
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