Electrical Machines

____ is followed to determine the direction of coil movement for electric motors

• Fleming's left hand rule

• Faraday's left hand rule

• Faraday's right hand rule

• Fleming's right hand rule

What does the thumb indicate in Fleming's left hand rule

• Force

• Current

• Magnetic field

• Voltage

What is the direction of coil movement in the image shown

• Towards the magnet

• Away from the magnet

• In the direction of current flow

• Downwards

Choose all that applies to a DC Shunt motor

• Field winding has more number of turns of thin wires

• High starting torque

• Constant Speed Motor

• Used in electric cars

A d.c. generator whose field magnet winding is supplied from an independent external d.c. source:

• Self Excited DC generator

• Separately excited DC generator

The direction of the induced emf in generators is found out using:

• Fleming's right hand rule

• Fleming's left hand rule

• Faraday's left hand rule

• Right hand thumb rule

Speed of the induction motor reduces with the load applied

• True

• False

The difference between the speed of the stator and the actual speed is called

____ is used to provide electrical connectivity between the static and rotating parts of the DC motor

• Commutator

• Brush

Force acting on the conductor is proportional to the current in the conductor and the strength of the magnetic field

• True

• False