Electrical Machine II Lab

Necessary conditions for parallel operation of Alternator

(a)  

Other name of Induction Motor is

• Rotating Transformer

• Industrial Motor

• Asynchronous motor

• All of these

In which part of Alternator EMF is induce

(a)  

What are the Causes of electrical Harmonics?

• Electrical Bulb

• Electrical Heater

• Uninterruptible power supply (UPS)

• Electrical kettle

Eddy current loss will depends on

• Frequency

• Flux density

• Thickness

• All of these

The emf induced in the dc generator armature winding is

• AC

• DC

• AC and DC

• None of the above

The effect of ------------------ on main field flux is armature reaction?

• armature mmf

• armature current

• armature flux

• all of the above

how can we improve power factor using synchronous motor

• Over excited

• under excited

• normal excited

• None of the above

In case the field of a synchronous motor is under excited, the power factor will be

• leading

• lagging

• zero

• unity

Synchronous motor can operate at

• Lagging power factor only

• Leading power factor only

• Unity power factor only

• Lagging, leading and unity power factor only