Theory questions test

Why the armature core of DC generator is laminated?

• Reduce the copper loss

• Reduce the friction loss

• Reduce the hysteresis loss

• Reduce the Eddy current loss

Why are major registers of a DC generator is very low

• Reduce the armature current

• Reduce armature voltage drop

• Reduce armature voltage drop run armature with less weight

• Reduce the temperature of armature

Hi the decision returns should run in clockwise direction only?

• Protect brushes from damage

• Protect the residual magnetism

• Avoid short circuit in armature

• Avoid overloading of generator

What is the reason of for DC generator fails to build up voltage?

• Loose brush contact

• Armature resistance is more

• Field resistance is above critical resistance

• Prime mover is running at above rated speed

What is the name of generator if its field is connected in parallel with armature?

• Shunt generator

• Series generator

• Compound generator

• Self excited generator

What is the purpose of pole shoe in DC generator

• Reduce the air gap

• Increase the field strength

• Minimise the magnetic losses

• Spread out flux uniformly in the air gap

Which material is used to make brush in generator?

• Steel and graphite

• Carbonn and graphite

• Cast iron and graphite

• Aluminium and graphite

Which type of DC generator is used for long distance distribution lines?

• Shunt generator

• Series generator

• differential compound generator

• Cumulative compound generator

Which type of DC generator is use for a welding?

• Shunt generator

• Series generator

• Differential compound generator

• Cumulative compound generator

What is the property of wave winding in DC generator?

• Low current low voltage

• High current low voltage

• Low current high voltage

• High current high voltage