3-Phase Quiz#1

How are three phase voltages generated in one alternator?

• By using three magnetic fields separated by 60º.
• By using three stator coils separated by 60º.
• By using three magnetic fields separated by 120º.
• By using three stator coils. separated by 120º

What is the relationship between phase voltage (VP) and line voltage (VL) in a star connected three-phase alternator?

• Vp = √3 VL
• Vp = Z VL
• VL = √3 VP
• VL = Z VP

The figure shown below is

• A three phase system 
• single phase system 
• delta connection 

The three phase voltages are out of phase by 

• 180 degrees
• 120 degress
• 240 degrees 
• 90 degress

Single phase voltages find their applications at 

• homes, small shops
• Large commercial industries 

Three phase power is simple, efficient and cost effective that single phase power

• yes
• no

Which connection has the line voltage same as the phase voltage 

• wye 
• delta

The below picture shows the waves 

• in phase 
• out of phase 

Single phase system has 

• one power line and 1 neutral 
• 2 power lines and 1 neutral 
• 3 power lines and a neutral 

the voltage produced by three phase system is 

• 230V 
• 400V
• 300V
• 120V