Mechanical Engineering Questions and Answers

39. What is the difference between blower and fan?

A fan can turn air, but blower forces the air faster

40. Can you transfer the heat energy from cold body to hot body?

yes, with external work. Eg : Air conditioner

41. What is added in LPG to detect leakage?

Methyl Mercaptan

42. What is hogging and sagging?

Hogging describes a beam which curves upwards in the middle, and sagging describes a beam which curves downwards.

43. In internal combustion engine piston the maximum temperature occurs at ........

Ring section

44. What is the difference between Flexural strength and Tensile strength?

Flexural strength is resistance offered against bending. Tensile strength is resistance offered against tensile force.

45. Pitot tube is used for measurement of ........


46. What is the difference between Pipe and Tube?

Tube is defined by Outer diameter and Wall thickness (OD and WT). While Pipe is defined by Inner diameter

47. Power available at the shaft of an I.C engine is known is as.......

Brake horse power

48.What is Hertzian stress?

Contact stress on two contact surfaces

49. What Bernoulli’s Principle?

Bernoulli's principle states that for an inviscid flow, an increase in the speed of the fluid occurs simultaneously with a decrease in pressure or a decrease in the fluid's potential energy.

50. Mention flow measuring devices?

Venturimeter, Rotameter etc.


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