DC Machines-3 Quiz

What is the induced emf in a DC machine directly proportional to?

• Current and resistance

• Speed and flux per pole

• Voltage and power

• Frequency and capacitance

What is the induced emf called in a DC motor?

• Field Emf

• Back Emf

• Supply Emf

• Generated Emf

Which type of DC generator has its field winding energized by an external DC source?

• Permanent Magnet DC Generator

• Separately Excited DC Generator

• Compound Wound DC Generator

• Self-excited DC Generator

In a shunt wound generator, the field winding is connected across which component?

• Series winding

• Armature winding

• Commutator

• Battery

What happens to the flux produced by the magnets in a Permanent Magnet type DC generator over time?

• It becomes negative

• It increases

• It remains constant

• It deteriorates

In a series wound generator, the field coils are connected in series with which component?

• Commutator

• Armature winding

• Battery

• Field winding

What type of DC generator has both shunt and series fields?

• Separately Excited Generator

• Compound Wound Generator

• Self Excited Generator

• Permanent Magnet Generator

What is the main disadvantage of Permanent Magnet type DC generators?

• Complex design

• Deterioration of flux over time

• Low efficiency

• High cost

In a long shunt compound generator, the shunt field winding is connected in parallel with which components?

• Both armature and series field winding

• Only the series field winding

• Only the armature

• Only the battery

What is the characteristic of a DC shunt machine regarding its magnetic flux?

• Decreasing flux

• Constant flux

• Variable flux

• Increasing flux