Mechanical Engineering Questions and Answers

51. Pressure at any location reaches pressure equal to the saturated vapour pressure of liquid ...........in pipe begins

Cavitation

52. In a refrigeration cycle, the moisture content is to be removed before it enters into ........system

Evaporator

53. The reference fuels for knock rating of spark ignition engines would include.......

normal heptane and iso-octane

54. The thermal efficiency of a standard Otto cycle for a compression ratio of 5.5 will be.........

50%

55. The operation of forcing additional air under pressure into the engine cylinder is known as.......

supercharging

56. Euler's formula holds good only for......

long columns

57. The object of caulking in a riveted joint is to make the joint......

leak proof

58. Why you decide to become mechanical engineeer?

answer yourself

59. .......is used for tyre construction

sulfur

60. How do motion detectors work?

to help with construction work

61. What is seasoning?

It is the process of removing moisture from wood.

Contact stress on two contact surfaces

62. Why entropy change for a reversible adiabatic process is zero?

Because there is no heat transfer in this process.

63. What are two essential conditions of perfect gas ?

It satisfies equation of state and its specific heats are constant.

64. How much resistance is offered to heat flow by drop wise condensation?

Nill

65. In a Rankine cycle if maximum steam pressure is increased keeping steam temperature and condenser pressure same, what will happen to dryness fraction of steam after expansion ?

It will decrease.

                  

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