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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

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
A hydraulic press has a ram of 15 cm diameter and plunger of 1.5 cm. It is required to lift a weight of 1 tonne. The force required on plunger is equal to_________________?
A 10 kg
B 100 kg
C 1000 kg
D 1 kg
Correct Answer: 10 kg
Principle of similitude forms the basis of_________________?
A comparing two identical equipments
B designing models so that the result can be converted to prototypes
C comparing similarity between design and actual equipment
D hydraulic designs
Correct Answer: designing models so that the result can be converted to prototypes
Cavitation is caused by_____________________?
A high velocity
B high pressure
C weak material
D low pressure
Correct Answer: low pressure
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