Alternator and Generator Quiz

The load between two steam driven alternators operating in parallel may be adjusted by varying

• Steam supply to their prime movers

• Speed of the alternators

• Field strengths of the alternators

• Power factors of the alternators

The maximum current that can be supplied by an alternator depends on

• Exciter current

• Strength of the magnetic field

• Number of poles

• Speed of the exciter

The generator which gives dc supply to the rotor of an alternator is called

• Convertor

• Exciter

• Inverter

• Rectifier

In an alternator, when the load increases due to armature reaction, the terminal voltage

• Rises

• Drops

• Remains unchanged

• May drop or rise

The exciting field coil of an alternator is generally excited by

• A separate dc generator driver by some source

• A separate ac generator drive by some source

• A dc generator coupled directly to the armature shaft

• A battery

The rating of Alternator / Generator may be expressed in _

• kW

• kVA

• kVAR

• HP

Alternators are usually designed to generate

• Definite currents

• Definite power factor

• Variable frequencies

• Definite frequencies

In an alternator, armature reaction is considered equivalent to

• Fictitious impedance

• Fictitious conductance

• Fictitious reactance

• Fictitious resistance

The Synchronization of alternator depends on

• Voltage, Frequency

• Frequency, Phase Sequence

• Phase Sequence

• Voltage ,Phase Sequence& Frequency

The reluctance offered to the flux is more in

• q axis

• d axis

• Near the pole canter

• Mid way between two poles