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For the following questions answer them individually
No load rotational losses in electrical machine consists of
Friction and windage losses
Stator core, friction and windage losses
Rotor core, friction and windage losses
No load core,friction and windage losses
Transformers operating in parallel will share the load depends upon
rating
leakage reactance
efficiency
percentage impedance
Field weakening control method is used for the
below rated speed
above rated speed
None of these
both below rated speed & above rated speed
A DC shunt generator is
Self excited
series excited
shunt excited
separate excitation
In a DC series generator, the terminal voltage with increasein load will
decrease
increase gradually and then stay at rated voltage
increase to rated voltage and then may decrease
remain nearly constant
The working principle of transformer depends on
coulombs law
faradays law
amperes law
newtons law
The heat generated in the transformer is dissipated mainly by
conduction
radiation
Convection
All option are correct
In a 3-phase induction motor, the three-phasecurrents ia, ib and ic,each of equal magnitude, but differing in phase by
$$360^\circ$$
$$280^\circ$$
$$210^\circ$$
$$120^\circ$$
A simple method of increasing the voltage of a DC generator is ...........
to decrease the air gap flux density
to increase the speed of rotation
to decrease the speed of rotation
to increase the length of the armature
An three induction motor is similar to
transformer secondary short circuit
transformer secondary open circuit
dc motor with load
dc motor without load
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