Mechanical Engineering MCQs

Which of the following statement is wrong?

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[A]. In a two stage reciprocating air compressor with complete intercooling, maximum work is saved.
[B]. The minimum work required for a two stage reciprocating air compressor is double the work required for each stage.
[C]. The ratio of the volume of free air delivery per stroke to the swept volume of the piston is called volumetric efficiency.
[D]. none of the above
✅ The correct answer is option D.

The main function of the tread pattern on tyre is that

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[A]. the tread grooves pass air between the tyre and road surface, thereby preventing tyre from overheating
[B]. the crests between the tread grooves absorb road noise
[C]. in wet conditions, the tread grooves expel water that is drawn between the tyre and road surface
[D]. the tread pattern protects the tyre’s inner carcass from small stones and pieces of glass
✅ The correct answer is option C.