Question { NET, 112527 }

The maximum time gap between two successive sessions of
parliament can be

(1) 4 months

(2) 6 months

(3) One year

(4) No limit

Answer

The time gap between the last day of the previous session and the first day of the next session should not be more than six months. In practice, however, normally three sessions are held every year

Question { century, 6376 }

how we calculate size of exciter(excit. volt and current)
for generator?

Answer

the rating of the exciter for generator is generally taken as
2-3% of the rating of the generator....

Question { Seagate, 6525 }

what is humming AC solenoid

Answer

when the core of the solenoid is cojusted or less than the
required area.as the windings are placed very closer the local
currents will diffuse with each other (or collide) which will
cause in production of the humming sound...this i had
personally experienced when i am preparing a solenoid core
transformer for my project....

Question { NHPC, 21716 }

what is the basic difference between synchronous
motor,synchronous generator and induction motor

Answer

induction motor is generally treated as rotating transformer becoz its working principle is same as transformer(mutual induction) and the I.M is of rotating...where as in synchronous machines the magnetic field is rotating and the speed will be constant which is not constant in the case of induction motor!!

Question { ABB, 25915 }

can u name the different types of motors used in different
types of applications?

Answer

1-phase induction motors with capacitor in series(as the 1-phase induction type is not self starting capacitor is used) is used for ceiling fans and..........induction motors are also used for lathe machines also...
universal motors are used for mixer grinder....

synchronous motors are used in paper mill(as the paper & textile mills are required to operate at const.speed)

Question { 7376 }

How can we explain that what is the power factor?

Answer

to be straight answer ...power factor is the cosine of
angle between the voltage and current..but once check it
out for perfect answer