Week 5_Electrical Machine

Which of these is NOT a part of a DC Generator.

• Slip rings
• commutator 
• brushes
• stator

AC generator converts:

• Mechanical energy to electrical energy

• Electrical energy to mechanical energy

• Heat energy to mechanical energy

• Chemical energy to electrical energy

What is true of AC GENERATOR?

• It works on the principle of electromagnetic induction

• The mechanical energy of the rotation is converted into electrical energy

• A pair of slip rings are used in the AC generator

• All the above

The electricity generated from the power plant is ……

• Alternating Current

• Direct Current

• Delayed Current

• Eddy Current

In an AC generator, the contacts are made from a soft but highly conductive material, usually carbon, and are called....

• Coils

• Armatures

• Slip Rings

• Brushes

Generators generate

• electricity

• mechanical energy

• heat

• chemical energy

Which is the device that used to converts AC current into DC current

• rectifier

• inverter

• stator
• armature

What is the advantages of Alternating Current?

• The voltage could be lowered or raised by using a transformer

• The current will create a back emf

• The current is not stable and it tends to fluctuate with time

• Low voltage is for generation and transmission

DC current can be generated from various sources, except:

• Rectifiers

• Dynamos

• Photovoltaic cells

• Inverter

Explain the difference between Alternating Current And Direct Current?