Electrical Machines Objective Questions – Set 20

Flashing the field of DC generator means

Short circuiting is caused in the armature winding due to

The factors that are responsible for decrease in terminal voltage of a shunt generator are

The armature mmf of a DC machine has

Flashing of DC generator means

The compensating winding in a DC machine

In DC machines, the interpoles are provided

If residual magnetism is present in a DC generator, the induced emf at zero speed will be

The ___________________ generator has the poorest voltage regulation.

In DC generator on no-load, the air gap flux distribution in space is

A generator may loose residual magnetism due to

Open circuited armature coil of a DC machine is

In large sized DC machines the compensating windings are provided to

In a DC machine the armature mmf is

In a Dc generator the magnetic neutral axis coincide with geometrical neutral axis, when

Which of the following DC generators has rising V-I characteristics?

To avoid formation of grooves in the commutator

A 250 V DC generator in run at rated speed with no excitation. The open circuit voltage will be

In a DC generator, the ripples in the direct emf generated are reduced by employing

With the increases in field excitation of a DC generator, its generated emf

A 220 V DC generator is run at full speed without any excitation. The open circuit voltage will be

Which of following DC generator will be in a position to build up without any residual magnetism in the field?

For a specific open-circuit voltage of a DC generator, the short-circuit electric current will be maximum when it is

The armature MMF waveform of a DC machine is

The fall in speed of the DC generator due to increase in load can be corrected by

The voltmeter connected across a generator reads voltage same at no load and at full load (rated). The generator is of the type

The voltage regulation of a DC generator at full load being zero implies that the generator is

In DC generators, the residual magnetism is of the order of

Due to magnetic saturation, the flux per pole in a DC machine without brush shift

The slight curvature at the lower end of the OCC of a self excited DC generator is due to