Pick out correct expression.
Device which converts mechanical energy to electrical by using principle of electromagnetic induction.
AC generator
DC motor
Transformer
Both 1 and 2
Which of the following has its working based on electromagnetic induction?
DC motor alone
AC generator alone
Transformer alone
Both AC generator and transformer
Which of the following is not a part of ac generator ?
Field magnet
Armature coil
Slip ring
Commutator
At the ends, the current carrying solenoid behaves like
bar magnet with different polarities
compass needle
bar magnet with fixed polarity
current carrying coil
Direction of induced emf can be obtained from
Lenz's law
Flemings right hand rule
Flemings left hand rule
Which of the following statement is right?The magnetic field lines become denser if.
Strength of current in the loop is increased.
There is more number of turns in the loop.
If less number of turns in the loop.
In a step up transformer?
Ns = Np
Ns < Np
Ns > Np
Nothing can be said
Which of the following statement is incorrect? The speed of rotation can be increased by,
increasing the strength of current
increasing the number of turns of coil
increasing the area of coil
decreasing the strength of magnetic field
