[A]. True
[B]. False
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✅ The correct answer is option A.
Mechanical Engineering MCQs
A regenerative steam cycle renders
[A]. increased work output per unit mass of steam
[B]. decreased work output per unit mass of steam
[C]. increased thermal efficiency
[D]. decreased work output per unit mass of steam as well as increased thermal efficiency
✅ The correct answer is option D.
In a four stroke cycle petrol engine, the charge is ignited at
[A]. 30° before top dead centre
[B]. 30° after top dead centre
[C]. 30° before bottom dead centre
[D]. 30° after bottom dead centre
✅ The correct answer is option A.
The specific speed of a centrifugal pump, delivering 750 litres of water per second against a head of 15 metres at 725 r.p.m., is
[A]. 24.8 r.p.m.
[B]. 48.2 r.p.m
[C]. 82.4 r.p.m.
[D]. 248 r.p.m
✅ The correct answer is option C.
The maximum efficiency of a reaction turbine is
[A].
[B].
[C].
[D].
✅ The correct answer is option B.
In order to prevent tool from rubbing the work __________ on tools are provided.
[A]. rake angles
[B]. relief angles
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✅ The correct answer is option B.
In a ventilated disc brake,
[A]. a duct directs air towards the caliper for cooling while the vehicle is moving
[B]. caliper is covered with cooling fins
[C]. disc contains many small holes for optimum cooling performance
[D]. disc contains radial vanes between its rubbing surfaces for optimum cooling performance
✅ The correct answer is option D.
The ratio of the volume of free air delivery per stroke to the swept volume of the piston, is known as
[A]. compressor efficiency
[B]. volumetric efficiency
[C]. isothermal efficiency
[D]. mechanical efficiency
✅ The correct answer is option B.
If a body floating in a liquid returns back to its original position, when given a small angular displacement, the body is said to be in
[A]. neutral equilibrium
[B]. stable equilibrium
[C]. unstable equilibrium
[D]. none of these
✅ The correct answer is option B.
If the resultant of two equal forces has the same magnitude as either of the forces, then the angle between the two forces is
[A]. 30°
[B]. 60°
[C]. 90°
[D]. 120°
✅ The correct answer is option D.