Question { Facebook, 53082 }

what is the abrivation of GE- 9FA and 9E gas turbines

Answer

ge ms9001 fa means

ms mechanical shaft
9- frame size
f- class
a- version

actually it orginal coding was pg 9351 fa
pg- power generation
35- 350000 hp
1- single shaft
f- class
a- version

Question { BARC, 20661 }

Why is a condensor used in a rankine cycle?

Answer

condenser in a power plant is a heat exchanger for
transforming the vapor form(steam) in to liquid form
(water). this is because if we directly send the steam
without changing its phase the pump work required for
pumping the steam is more because steam occupies more
volume, where as if we convert in to water it can be easily
pumped with less pump work.this is because specific volume
of steam is more compared to water.

Question { IGCAR, 8947 }

Why stainless steel is corrosion resistant?. What is stress
corrosion cracking?.

Answer

stainless steel is corrosion resistent becuase it contain
corrosion resistent element called chromium. so even though
any scratches are formed on stainless steel material this
will expose to atmosphere and can cause corrosion but
becuase of chromim present it form the new layer on the
metal it acts as protective coating.

Question { ONGC, 17965 }

what is materal used for piston in IC engine& why?

Answer

aluminium will be used for making piston because of its
high strength to weight ratio. it gives more strength wth
less amount of weight. the thermal conductivity of
aluminium is also very good so it can easily transfer the
heat from the piston to the cylinder walls.