The motor is running due to the non operation of the thermal
over load relay. The motor will keep on running till the
winding temperature increases the designed limit, finally
the motor will burn under the winding short circuit
condition causing production loss & down time .
Ans #1 is partly correct, but probably that is not the
intended answer. Rating of a motor is decided depending on
the ambient temperature. When you say that the rated
current is 38 Amps, what you mean is it can take a
continuous current of 38 Amps at the design ambient
temperature (say 40 degree C). During winter, the ambient
temperature may be 10 deg. At that ambient, it can take a
much higher current. (You can also give extra cooling of
the motor winding by providing an external ventilation
fan).
in transmission line, if the load is suddenly increased at
the receiving end of the system the phase shift will
(a)decrease
(b)becomems zero
(c)increase
(d)not be affected
I am working in 600MW power plant currently in erection
phase. I came along this term and want to know its meaning
in simple language, consider me naive!??
All motors shall be of energy efficient type EFF-2 as per
IS:12615/ equivalent IEC /
International Standard.
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