[A]. equal to the velocity of sound
[B]. less than the velocity of sound
[C]. more than the velocity of sound
[D]. none of these
✅ The correct answer is option A.
Mechanical Engineering MCQs
The highest thermal diffusivity is of
[A]. iron
[B]. lead
[C]. concrete
[D]. wood
✅ The correct answer is option B.
Which of the following statement is wrong about ultra-sonic machining?
[A]. It is best suited for machining hard and brittle materials.
[B]. It cuts materials at very slow speeds.
[C]. It removes large amount of material.
[D]. It produces good surface finish.
✅ The correct answer is option C.
According to Unwin’s formula, the relation between the diameter of rivet hole (d) and the thickness of plate (t) is given by (where d and t are in mm)
[A]. d = t
[B]. d = 1.6 t
[C]. d = 2 t
[D]. d = 6 t
✅ The correct answer is option D.
A safety valve usually employed with stationary boilers is
[A]. lever safety valve
[B]. dead weight safety valve
[C]. high steam and low water safety valve
[D]. all of these
✅ The correct answer is option D.
The tilting of the front wheels away from the vertical, when viewed from the front of the car, is called
[A]. camber
[B]. caster
[C]. toe-in
[D]. toe-out
✅ The correct answer is option A.
The brake power of a diesel engine, keeping other parameters constant, can be increased by
[A]. decreasing the density of intake air
[B]. increasing the temperature of intake air
[C]. increasing the pressure of intake air
[D]. decreasing the pressure of intake air
✅ The correct answer is option C.
The charge is fed into the blast furnace through the
[A]. stack
[B]. throat
[C]. bosh
[D]. tuyers
✅ The correct answer is option B.
For unequal width of butt straps, the thickness of butt straps are
[A]. 0.75 t for wide strap on the inside and 0.625 t for narrow strap on the outside
[B]. 0.75 t for narrow strap on the inside and 0.625 t for wide strap on the outside
[C]. 0.75 t for both the straps on the inside and outside
[D]. 0.625 t for both the straps on the inside and outside
✅ The correct answer is option A.
A beam supported at its both ends is not a simply supported beam.
[A]. True
[B]. False
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✅ The correct answer is option B.