mechanical interview questions......
mechanical interview question....
What is the difference between Critical
Speed and Whirling Speed?
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.
speed of rotation approaches the objects natural
frequency, the object begins to resonate which
dramatically increases system vibration.
resonance occurs regardless of orientation.Whirling
Speed is due to the unbalanced forces acting on a
How a Diesel Engine Works as Generator?
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.
Explain Second Law of Thermodynamics?
The entropy of the universe increases over time
and moves towards a maximum value.
Compare Brayton Cycle and Otto Cycle?
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.p
-Brayton cycle is the ideal cycle for gas power turbines.
What is the purpose of Scrapper Ring?
scrap the excess lube oil from the cylinder
walls. there by preventing oil from entering combustion
What is DTSI Technology?
DTSI stands for Digital Twin Spark Plug Ignition.
The vehicles with DTSI Technology use 2 spark plugs
which are controlled by digital circuit. It results in
efficient combustion of air fuel mixture.
Digital – Since the spark generation will be initiated
by a microchip.
Twin – Since two spark plugs will be used.
Spark ignition – Since the ignition will be done via
How to Find, Ductile-Brittle Transition
Temperature in Metals?
The point at which the fracture energy passes
below a pre-determined point for a standard Impact
DBTT is important since, once a material is cooled
below the DBTT, it has a much greater tendency to
shatter on impact instead of bending or deforming.
What is the importance of
All the mechanical engineering systems are
studied with the help of thermodynamics.
Hence it is
very important for the mechanical engineers.
What is the difference between P11 and
P11 the chromium molybdenum composition
that is 1% ofchromium and 1/4% of molybdenum
P12 the chromium molybdenum composition that is 1%
ofchromium and 2% of molybdenum
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