Transformers MCQs (Part-5)

What does a transformer’s efficiency depend on?

A Voltage
B Core material
C Current
D Load conditions

What is the main cause of eddy current losses in a transformer?

A Resistance
B Magnetic flux
C High current
D Voltage imbalance

Which of these losses are considered constant in a transformer, regardless of load?

A Iron losses
B Load losses
C Stray losses
D Copper losses

What does the voltage regulation of a transformer indicate?

A Core saturation
B Efficiency
C Voltage drop
D Current flow

What happens when a transformer is operated below its rated voltage?

A Increased current
B Reduced efficiency
C Reduced current
D Increased voltage

What is the primary function of a load test in transformer testing?

A Measure efficiency
B Identify faults
C Calculate losses
D Check insulation

What is the result of increasing the current in a transformer’s primary winding?

A Increased voltage
B Decreased flux
C Increased flux
D Decreased voltage

Which type of transformer is typically used for large power transmission over long distances?

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

What is the function of a tap changer in a transformer?

A Adjust voltage
B Decrease current
C Change current
D Increase efficiency

Which of the following factors has the greatest impact on transformer losses?

A Insulation
B Core material
C Load type
D Frequency

What happens to a transformer’s efficiency when it operates at very low loads?

A It remains constant
B It fluctuates
C It decreases
D It increases

In which type of transformer is the primary and secondary winding electrically connected?

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

How is the primary current related to the secondary current in a transformer?

A Inversely proportional
B Unrelated
C Equal
D Directly proportional

Which transformer type is commonly used for high voltage transmission in industrial settings?

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

What is the main difference between a dry-type and oil-filled transformer?

A Efficiency
B Cooling method
C Voltage rating
D Size