Fundamentals of Electric Circuits MCQs (Part-9)

What is the primary function of a transformer in a circuit?

A Voltage conversion
B Current conversion
C Power factor correction
D Energy storage

How does circuit simplification affect the analysis of complex circuits?

A Increases complexity
B Reduces calculation errors
C Decreases component count
D Removes components

What is power factor correction used for in electrical systems?

A Increase current flow
B Improve circuit resistance
C Decrease energy loss
D Improve voltage regulation

What is the key principle of a transformer’s operation?

A Faraday’s law
B Direct current
C Capacitive reactance
D Mutual induction

What is the effect of adding resistors in parallel on total resistance?

A Decreases
B Increases
C No effect
D Doubles

What does an ideal transformer assume regarding power loss?

A Maximum loss
B Zero loss
C Power fluctuation
D Energy loss

How is the efficiency of a transformer determined?

A Voltage ratio
B Current ratio
C Power output / Power input
D Impedance ratio

What happens when you increase the power factor in an electrical system?

A Decreases efficiency
B Increases current
C Reduces voltage
D Reduces power loss

What does the core of a transformer do?

A Provides a magnetic path
B Directs current
C Generates electricity
D Stores energy

What is the relationship between the primary and secondary windings in an ideal transformer?

A Inverse
B Direct
C Unrelated
D Independent

What happens to the total current in a parallel circuit when more branches are added?

A Stays constant
B Decreases
C Increases
D Fluctuates

How does power factor correction improve an AC system?

A Reduces voltage
B Reduces impedance
C Increases efficiency
D Decreases frequency

How does adding capacitors in parallel to a load affect the power factor?

A Increases lead
B Increases lag
C Decreases power factor
D Stabilizes voltage

What is the role of the primary coil in a transformer?

A Supplies power to the system
B Induces current in the secondary coil
C Stores energy
D Regulates voltage

What happens to the impedance in a parallel circuit with capacitors and resistors?

A Increases
B Decreases
C Remains constant
D Fluctuates