Question { HCL, 43963 }

why I-sections are considered to be stronger one than any
other ?
how does a ship floats?

Answer

1) I- section is said to be stronger because Moment of
inertia is greater than that of the rectangular cross section.

2) Ship float if the mass of the body is less than the mass
of the fluid displaced by the body when it is immersed into
it. Its based on Newton's third law. Normally Ship floats
due to Buoyance force. According to Newtons III Law,
Buoyance force will be equal to the mass of the body.

Question { 13656 }

What is the deff betwen Two stroke engine & Four stroke
engines. Difine Theoretcally & Practically.

Answer

In two stroke engine, One cycle completes in one revolution
whereas in four stroke engine, one cycle completes in two
revolution.
In two stroke engine, scavenging is must to get the
in-exhaust fuel exhausting.
Two stroke engine has ports whereas four stroke engine has
valves.
Thermal efficiency is less in case of two stroke engine when
compared with the four stroke engine.
More pick up in case of two stroke engine whereas more
mileage in case of four stroke engine.

Question { 13364 }

In orifice why the pressure and temperature are decreases?

Answer

Orifice is a small hole like a nozzle. When a high pressure
fluid passes through the orifice, Pressure gets reduced
suddenly and the velocity of the fluid gets increased. Also
the heat transfer rate increases. We know that Heat transfer
rat is directly proportional to the difference in
temperature, Area and the heat transfer coefficient. Heat
transfer Coefficient remains constant for a fluid at a
particular temperature.
Q= KA(T1-T2)
If the heat transfer rate increases, it seems the
difference in temperature gets increased. There is no way in
reduction of inlet temperature of the orifice. As a result,
The outlet temperature of the orifice gets reduced.
Hence the pressure and temperature gets reduced when
it passes through orifice.

Question { 40337 }

what is diff between sensors and transducers.explain with
ex?

Answer

Sensor senses the measured quantity and convert into a
signal whereas transducer converts one form of energy into
another.All Sensors can be a transducers but all transducer
can't be a sensors.Transducer needs a sensor to display the
output.