CP23 Quiz 2

An alternator works on the principle of:

• Electrostatic induction

• Mutual induction

• Electromagnetic induction

• Thermoelectric effect

In an alternator, the rotor is generally used to:

• Generate AC voltage

• Provide excitation

• Support the armature winding

• Reduce eddy current losses

Which type of alternator is commonly used in hydroelectric power stations?

• Salient pole alternator

• Cylindrical rotor alternator

• Induction alternator

• Linear alternator

In an alternator, which type of armature winding provides better output characteristics?

• Lap winding

• Wave winding

• Short-pitch winding

• Open circuit winding

Which of the following is an advantage of an alternator over a DC generator?

• Higher efficiency

• Simpler commutation

• Lower maintenance cost

• All of the above

The winding factor in an alternator is the product of:

• Distribution factor and pitch factor

• Pitch factor and power factor

• Distribution factor and load factor

• Voltage regulation and efficiency

The induced EMF in an alternator is given by the equation:

• E=4.44fNϕKw

• E=2πfBAKd

• E=BLv

• E=IR+jX

When an alternator is loaded with an inductive load, the power factor is:

• Unity

• Leading

• Lagging

• Zero

Voltage regulation of an alternator is defined as the percentage change in terminal voltage when:

• The speed of the alternator changes

• The load changes from full-load to no-load

• The field current is increased

• The frequency is increased

For the successful synchronization of an alternator, which of the following conditions must be satisfied?

• Equal voltage

• Same frequency

• Same phase sequence

• All of the above