[A]. Correct
[B]. Incorrect
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✅ The correct answer is option A.
Mechanical Engineering MCQs
Static friction is always __________ dynamic friction.
[A]. equal to
[B]. less than
[C]. greater than
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✅ The correct answer is option C.
Thermal diffusivity is a
[A]. function of temperature
[B]. physical property of a substance
[C]. dimensionless parameter
[D]. all of these
✅ The correct answer is option B.
In a four stroke cycle petrol engine, the charge is compressed when both the valves (i.e. inlet valve and exit valve) are closed,
[A]. Agree
[B]. Disagree
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✅ The correct answer is option A.
The simply supported beam ‘A’ of length l carries a central point load W. Another beam ‘B’ is loaded with a uniformly distributed load such that the total load on the beam is W. The ratio of maximum deflections between beams A and B is
[A]. 5/8
[B]. 8/5
[C]. 5/4
[D]. 4/5
✅ The correct answer is option B.
A shaft has an attached disc at the centre of its length. The disc has its centre of gravity located at a distance of 2 mm from the axis of the shaft. When the shaft is allowed to vibrate in its natural bow-shaped mode, it has a frequency of vibration of 10 rad/s. When the shaft is rotated at 300 r.p.m., it will whirl with a radius of
[A]. 2 mm
[B]. 2.22 mm
[C]. 2.50 mm
[D]. 3.0 mm
✅ The correct answer is option B.
The capacity of a hydraulic accumulator is generally specified as the maximum amount of energy stored.
[A]. True
[B]. False
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✅ The correct answer is option A.
The thermal efficiency of diesel engines is about
[A]. 15%
[B]. 30%
[C]. 50%
[D]. 70%
✅ The correct answer is option D.
When the connection between the two elements is such that only required kind of relative motion occurs, it is known as self-closed pair.
[A]. Right
[B]. Wrong
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✅ The correct answer is option A.
Reynolds number (RN) is given by (where h = Film coefficient, l = Linear dimension, V = Velocity of fluid, k = Thermal conductivity, t = Temperature, ρ = Density of fluid, cp = Specific heat at constant pressure, and μ = Coefficient of absolute viscosity)
[A].
[B].
[C].
[D].
✅ The correct answer is option C.