MECHANICAL ENGINEERING JOB INTERVIEW QUESTIONS

1.)Why condenser is needed in steam
power plant?
Ans.-The function of the condenser is
to condense exhaust steam from the
steam turbine by rejecting the heat
of vaporization to the cooling water
passing through the condenser.
2.)What is absolute humidity and
relative humidity?
Ans.-Absolute humidity is the mass
of water vapor divided by the mass of
dry air in a volume of air at a given
temperature. The hotter the air is,
the more water it can contain.Relativ
e humidity is the ratio of the current
absolute humidity to the highest
possible absolute humidity.
3.)What is viscosity?
Ans.-The viscosity of a fluid is a
measure of its resistance to gradual
deformation by shear stress or tensile
stress. For liquids, it corresponds to
the informal notion of "thickness". For
example, honey has a higher viscosity
than water.
4.)What is difference between power
cycles and heat pump cycles?
Ans.-Any thermodynamic cycle
functions in a similar way. There are
basically 3 interlinked energy sources
at play:
1. A reservoir of heat energy at high
temperature Eh
2. A reservoir of heat energy at low
temperature Ec
3. Mechanical (driving) energy P.
The power cycle provides high
temperature heat energy Eh, harvests
mechanical P and throws away low
temperature energy into Ec.
Whereas,
The heat pump provides P, harvests
Eh and throws away into Ec.