Answer / natha

efficiency =o/p divided by i/p and i/p-losses=o/p for any machine

in generator efficiency(n) is
n=o/p divide i/p=o/p divide op+losses

for motor
n=(ip-losses) divide i/p
by simple maths first quantity is greater
consider same machine acts as both gen n motor having losses 5 units
generator(suppose op is 10) n=10/10+5=.66666
motor(suppose ip is 10units) n=10-5/10=.5

Answer / ayid

for generator,, no slip detected because the speed of gen.
equals to the synchrounus speed... but motor speed always
less than synchronus speed & the diffrance is the slip which
reduce motor efficiency

Answer / princealekota

generator is a machine which converts mechanical energy to
electrical it is having only iron and cu losses. and the
rating of generator is also given in KVA.

motor is the machine which converts electrical energy to
mechanical in its output there are many loses like
frictional losses, rotational losses, Power losses,
Magnetic core losses,windage losses, and Stray load losses.
including the above losses occur in generator. and the load
here is resistive the rating of the motor is given in KW.

since efficiency is the ratio of o/p to i/p

i/p is o/p - losses

since the losses in motor are more the efficiency is less
in motor compared to generator

Answer / gunasekaran

for generator i/p is not constant it is varriable but for
motor input power is constant.

bit confused - am i correct in thinking that to determine line to line voltage in a star config 110v 3 phase 4 wire distribution system i would use a voltmeter? I have a circuit configured as an unbalanced load, consisting of three incandescent lamps (1x40w, 1x60w, 1x100w - all 110v rated)connected in a star configuration to a 110v 3 phase 4 wire distribution system. I want to find out what types of meters i would use to obtain: a) each line to line voltage b) the line to neutral voltage across each load c) current flowing in each line and load d) current flowing in the neutral conductor e) power supplied to the loads im assuming i would be using ammeters in series along each line and voltmeters in parallel across each line to neutral? Also how could i predict these meter readings before taking them and with which formulae? Any help would be greatly appreciated A.

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