DMRC Electrical Engineering Paper-1 2014

Loss in a capacitor

Frequency

Accurate value of electrical quantity

Properties of the coils

Has a D.C. winding on the rotor

Rotor is made out of hard magnetic material

Has squirrel-cage winding on the rotor

Is not-self starting

Transformer earthing

Reducing transmission tower footing resistance

Generator earthing

Motor earthing

Fixed ac voltage to variable magnitude ac voltage of same frequency

Fixed ac voltage to variable frequency ac voltage of same magnitude

Fixed ac voltage to variable frequency ac voltage through dc link

Fixed ac voltage to variable magnitude variable frequency ac voltage

Protect the switching devise against over voltage

Provide path for freewheeling current

Allow the motor to return energy during regeneration

Help in switching off the devices.

More number of turns of fine wire

Less number of turns of fine wire

Less number of turns of thick wire.

More number of turns of thick wire.

ac and dc voltages

ac voltage and current

dc voltage and current

ac and dc currents

Dielectric loss

The inductance

Low resistance

Mutual inductance

Power factor of primary.

Wattless component of the current in the primary.

Exciting current

Leakage flux.

Over compensation for friction

Vibrations

Stray magnetic fields

Excessive voltage across the potential coil.