Transformers MCQs (Part-11)

What is the function of a transformer’s equivalent circuit?

A To represent the transformer’s losses
B To simulate the electrical behavior of the transformer
C To calculate the impedance of the transformer
D To determine the number of turns in the windings

What is the primary cause of harmonic distortion in transformers?

A Overloading the transformer
B The non-linear nature of the load
C Poor voltage regulation
D Insufficient insulation

What is the effect of impedance in a transformer?

A It regulates voltage
B It limits the flow of current and causes a voltage drop
C It decreases transformer losses
D It increases transformer efficiency

What is the purpose of a short-circuit test in transformer testing?

A To determine core losses
B To measure copper losses
C To measure efficiency of the transformer
D To test the insulation resistance

What is an earthing transformer used for?

A To step up voltage in a distribution network
B To provide a neutral point for grounding in an ungrounded system
C To reduce voltage harmonics
D To regulate the transformer’s temperature

Which of the following tests is used to measure the efficiency of a transformer under load?

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

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

A It increases the current in the secondary winding
B It increases the voltage in the secondary winding
C It decreases the voltage in the secondary winding
D It increases the efficiency of the transformer

What is the role of insulation testing in transformers?

A To ensure proper voltage regulation
B To check the integrity of the transformer’s insulation system
C To test the core material
D To measure core losses

What is a key feature of an isolation transformer?

A It steps up voltage for long-distance transmission
B It isolates electrical circuits to prevent electrical noise or faults
C It is used only for high-voltage applications
D It improves voltage regulation