Generator/Alternator MCQ

The rating of Alternator / Generator may be expressed in

Salient pole type rotors are designed for alternators with many number of poles and Cylindrical rotors are designed for alternators with two to four poles.

For a short pitch coil, the pitch factor is

Most of the Alternators have rotating field and stationary armature.

Alternators are also called Synchronous generators because

For a three-phase, sixteen pole star connected alternator with 144 slots and 12 conductors per slot, if flux per pole is 0.03 Wb and speed is 400 RPM, the line induced EMF and generated frequency is

For a single layer, 36 slot, four pole, four phase stator winding, the value of distribution factor is

For an Alternator connected to a load, the terminal voltage per phase will

For a three-phase star connected alternator driven at 800 RPM, required to generate a line to line voltage of 430 Volts at 60Hz, if the stator winding is 2 slots per phase per pole and each coil has 4 turns, the value of useful flux per pole is

Alternators cannot be connected in parallel with one another.

For a three phase, star connected alternator rated 1500 KVA, 13000 V, if the armature effective resistance is 1.6 Ohms and the synchronous reactance is 32 Ohms respectively, the percentage regulation for a load of 1275kW at 0.8 leading power factor is

Alternator operates on the principles of

In a synchronous machine, if the field flux axis is ahead of the armature field axis in the direction of rotation, the machine operating is

What is the primary reason for placing field on rotor in an alternator?

Which type of alternator is used in hydroelectric power stations?

In a synchronous machine, the stator frame serves the purpose of

In a synchronous machine, the stator frame is made of

The open slots are commonly used in the stator of a synchronous machine as

The slip rings employed in a 3 phase synchronous machines are insulated for

In modern alternators, the rotating part is

The current from the stator of an alternator is taken output the external load circuit through

Hydro-generators are generally employed to run at rpm of

Larger diameter salient pole rotors have shorter axial length because

If the emf from the air gap line is the 3-phase alternator is 440V per phase and armature current is 110 A. The synchronous reactance is?

Ideally the voltage regulation of an alternator should be