50 Mechanical Engineering Interview Question and Answer

Mechanical engineering interview question and answer http://upseexam.blogspot.in/

1. What is the difference between Critical Speed and Whirling Speed?

Ans. In Solid mechanics, in the field of rotor dynamics, the critical speed is the theoretical angular velocity which excites the natural frequency of a rotating object, such as a shaft, propeller or gear. As the speed of rotation approaches the objects natural frequency, the object begins to resonate which dramatically increases system vibration. The resulting resonance occurs regardless of orientation. Whirling Speed is due to the unbalanced forces acting on a rotating shaft.

2. How a Diesel Engine Works as Generator?

Ans. Diesel engine is a prime mover, for a generator, pump, and for vehicles etc. generator is connected to engine by shaft. Mostly in thermal power plat, there is an engine is used to drive generator to generate power.

3. Explain Second Law of Thermodynamics?

Ans. The entropy of the universe increases over time and moves towards a maximum value.

4. Compare Brayton Cycle and Otto Cycle?

Ans. The heat addition and rejection processes in Otto cycle are of constant volume, whereas in Brayton cycle, they are of constant pressure. Otto  cycle  is  the  ideal  cycle  for  spark  ignition  engines. Brayton cycle is the ideal cycle for gas power turbines.

5. What is the purpose of Scrapper Ring?

Ans. Scrap the excess lube oil from the cylinder walls. There by preventing oil from entering combustion zone.

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50 Mechanical Engineering Interview Question and Answer

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50 Mechanical Engineering Interview Question and Answer