ACES EE DC GENERATOR

How would you determine, from visual observation of the armature winding, whether a generator is lap or wave wound?

• connection to the field winding

• connection to commutator

• connection to brushes

• the direction of the end connection

What classification is given to a generator that receives its field excitation current from internal source?

• self-excited

• controlled excitation

• separately-excited

• internally excited

The shunt field of a compound generator is connected across both the series field and the armature. this connection is known as

• short shunt

• long shunt

• differential compound

• cumulative compound

Residual magnetism is necessary in a___generator

• separately excited

• self excited

• both of these

• none of these

Electric dc generators have normally, an over-all efficiency of the order of___%

• 60 to 80

• 75 to 85

• 80 to 90

• 85 to 95

The armature magnetic field has effect that

• A. it demagnetized or weakens

• B. it cross magnetizes or distorts the main flux

• C. it magnetizes or strengthens the main flux

• both a nd b

Brushes are always placed

• along magnetic neutral axis

• along geometric neutral axis

• perpendicular to magnetic neutral axis

• perpendicular to geometric neutral axis

Magnetic neutral axis makes an electrical angle of___degree with the flux passing through the armature

• 0

• 90

• 45

• 180

In a dc generator the flux is sen to be___ at the trailing pole tips and also___at the leading pole tips

• weakened, weakened

• weakened, crowded

• crowded, weakened

• same, same

The function of the compensating winding is to neutralize

• reactance voltage generated due to communication

• cross-magnetizing effect of armature reaction

• demagnetizing effect of armature reaction

• all of these