Electrical - Important Interview Questions
Q1) What are the types of Transformers based on Winding/core construction?
Ans) Two types: 1)Core type 2) Shell type
In core type, winding is wound over laminated core's left leg and also on right leg as shown in pic below. Primary & secondary windings both are placed on same leg. Secondary is placed first over the core, primary winding is placed next after secondary.
In Shell type, a three leg core is present, where the winding is wound over on the middle leg and the other two legs cover and form a shell over the single winding wound over the middle leg. Pic below demonstrates it better.
Shell type Transformers have lesser core losses(because flux is divided in the extreme left & right legs, so losses become less). In applications where less physical space should be used, shell type transformers are used as they consume less winding space as only one middle leg is used for winding compared to core type where two legs are wound over with winding.
Ans) Two types: 1)Core type 2) Shell type
In core type, winding is wound over laminated core's left leg and also on right leg as shown in pic below. Primary & secondary windings both are placed on same leg. Secondary is placed first over the core, primary winding is placed next after secondary.
In Shell type, a three leg core is present, where the winding is wound over on the middle leg and the other two legs cover and form a shell over the single winding wound over the middle leg. Pic below demonstrates it better.
Shell type Transformers have lesser core losses(because flux is divided in the extreme left & right legs, so losses become less). In applications where less physical space should be used, shell type transformers are used as they consume less winding space as only one middle leg is used for winding compared to core type where two legs are wound over with winding.
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