Question { 24619 }

What is thyristor?

Answer

a thyristor is a semiconductor device which have
three or more junctions like scr diac triac etc

Question { wbsedcl, 8382 }

what is linear motor?

Answer

nirbhay's answer is absolutely correct. the jet
trains in japan which can accelerate their speed
upto 500km per hour
are the best examples of linear motor. here the
train acts as a linear rotor which is excited with
3 phase supply and the rails act as a unrolled
stator which contains short circuited cross bars.

Question { Birla, 15037 }

why heat produced at junction of two different conductor.
what care should be taken to minimize it.

Answer

generally different conductors are having different
electron density.if current flows from high
electron density conductor to low density conductor
heat will be produced at the junction due to sudden
change in electron density.to avoid this the two
conductors to be junctioned should have minimum
difference in electron density.in some other cases
contact resistance causes heat if they are not
tightly held together.

Question { Emerson, 90090 }

Difference between ups

Answer

inverter is just a
circuit which
converts dc supply
into ac supply. but
ups is a device which
stores electrical
power on normal
conditions and gives
back power to load
when the EB fails to
supply power. an ups
has an inverter circuit.