MECHANICAL ENGINEERING JOB INTERVIEW QUESTIONS :- 1.)Why Entropy decreases with increase in temperature? Ans. ds=dQ/T Entropy is inversely proportional to the temperature so, as temp. Increases, entropy decreases. 2.)Definition of Octane Number and Cetane Number? Ans. Octane No.- Octane number is defined as the percentage, by volume, of iso octane in the mixture of iso octane and h-heptane. It is the measure of rating of SI engine. Cetane No.- Cetane number is defined as the percentage, by volume, of n-cetane in the mixture of n-cetane and alpha methyl naphthalene. It is the measure of rating of CI engine. 3.)Which Mechanism is used in Automobile gearing System? Ans. Differential mechanism. 4.)How Cavitation can be eliminated by Pump? Ans.• Cavitation means bubbles are forming in the liquid. • To avoid Cavitation, we have to increase the Pump size to One or Two Inch; • To increase the pressure of the Suction Head, or • Decrease the Pump Speed. For more interview questions like Mechanical Engineers Rocks.
Posted on: Mon, 30 Sep 2013 16:30:00 +0000
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