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mechanical interview questions

mechanical interview questions ,questions generally asked in interview

What is the difference between Technology
and Engineering?

Ans. Engineering is application of science. Technology
shows various methods of Engineering. A bridge can be
made by using beams to bear the load,by an arc or by
hanging in a cable; all shows different technology but
comes under civil engineering and science applied is
laws of force/load distribution.

How to Measure Temperature in Wet Bulb

Ans. Wet bulb temperature is measured in a wet
bulb thermometer by covering the bulb with a wick and
wetting it with water. It corresponds to the dew point
temperature and relative humidity.

What are the Advantages and
Disadvantages of using LPG in Car?

Ans. Advantages
1. Complete combustion
2. Fuel saving
3. Homogenous combustion
1. As complete combustion is occurring ,more heat
liberated,not advised for long journey, engine will be
over heated
2. Installation is difficult
3. Reduce engine life efficiency

[b]What is the difference between Speed and
Economic Speed?

Ans. The rated speed tells us about the maximum
speed which can be achieved by a vehicle or some
other machine but the economical speed means the
speed limit at which the machine works efficiently with
least consumption of fuel.eg-in normal bikes(not
racing),the max.speed limit shown on speedometer is
upto 120 kmph but companies always advice their
customers to drive such bikes at around 60 kmph to
have maximum milleagege

What is Powder Technology?

Powder technology is one of the ways of making
bearing material. In this method metals like bronze, Al,
Fe are mixed and compressed to make an alloy.

State all the laws of Thermodynamics?.....very very important

Ans. There are three laws of the thermodynamics.
First Law: Energy can be neither created nor
destroyed. It can only change forms. In any process in
an isolated system, the total energy remains the same.

Second Law: When two isolated systems in separate but
nearby regions of space, each in thermodynamic
equilibrium in itself, but not in equilibrium with each
other at first, are at some time allowed to interact,
breaking the isolation that separates the two systems,
and they exchange matter or energy, they will
eventually reach a mutual thermodynamic equilibrium.
The sum of the entropies of the initial, isolated systems
is less than or equal to the entropy of the final
exchanging systems. In the process of reaching a new
thermodynamic equilibrium, entropy has increased, or
at least has not decreased.

Third Law: As temperature approaches absolute zero,
the entropy of a system approaches a minimum.

State the difference between Unilateral and
Bilateral Tolerance?

Ans. A unilateral tolerance is tolerance in which
variation is permitted only in one direction from the
specified direction.e.g. 1800 +0.000/-0.060
Bilateral tolerance is tolerance in which variation is
permitted in both direction from the specified
direction.e.g. 1800 +0.060/-0.060

What is the abbreviation of welding rod

Ans. 7018 =
70=tensile strength 70000psi
1= welding position
8=current flux

What is difference between Welding and

Ans. In Welding concentrated heat (high temperature)
is applied at the joint of metal and fuse together.

In Brazing involves significantly lower temperatures and
does not entail the melting of base metals. Instead, a
filler metal is melted and forced to flow into the joint
through capillary action.

Which has more Efficiency Diesel Engine or
Petrol Engine?

Diesel engine has the better efficiency out of

.I will post more if I get +ve responses

thank you GH.
visit again n again Heart
ya more interview question bcZ I BLONG THIS BRANCH
Nice work....keep going....
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Thanks for so nice thread. Give more questions
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