Transformers MCQs (Part-4)

What is the main purpose of using a laminated core in transformers?

A Lower resistance
B Reduce losses
C Improve insulation
D Increase flux

What is the basic principle of operation of a transformer?

A Magnetic induction
B Chemical reaction
C Electrostatic induction
D Electromagnetic radiation

What is the effect of increasing the number of turns in the secondary winding of a transformer?

A Decreased impedance
B Increased current
C Decreased voltage
D Increased voltage

In which transformer configuration is the primary and secondary winding physically connected?

A Step-up transformer
B Autotransformer
C Step-down transformer
D Isolation transformer

What material is commonly used for the core of a transformer?

A Iron
B Copper
C Silicon steel
D Aluminum

What is the function of a transformer’s insulating oil?

A Improve cooling
B Increase efficiency
C Protect the core
D Increase voltage

Which of these transformers is most often used in high voltage power transmission?

A Isolation transformer
B Step-down transformer
C Distribution transformer
D Power transformer

What is the purpose of the primary winding in a transformer?

A Maintain voltage
B Generate heat
C Create magnetic flux
D Induce current

How is the efficiency of a transformer affected by core losses?

A Core losses improve voltage
B Core losses decrease efficiency
C Core losses increase efficiency
D Core losses do not affect efficiency

What happens when a transformer is overloaded?

A It may overheat
B It reduces frequency
C It cools down
D It increases voltage

What is a key difference between dry-type and oil-filled transformers?

A Voltage rating
B Efficiency
C Cooling method
D Insulation material

Which type of transformer is used to protect against electrical surges?

A Protection transformer
B Autotransformer
C Step-up transformer
D Isolation transformer

What is the most common test used to measure the efficiency of a transformer?

A Impedance test
B Load test
C Open-circuit test
D Short-circuit test

What is the purpose of the secondary winding in a transformer?

A Transfer energy to load
B Control voltage
C Provide magnetic flux
D Generate heat

In a three-phase transformer, how are the windings typically arranged?

A In a circle
B In series
C In star or delta
D In parallel