Basic Electrical Engineering MCQs (Part-7)

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

A To store energy
B To limit current
C To change voltage
D To measure power

What type of current does a transformer work with?

A Alternating current (AC)
B Direct current (DC)
C Both DC and AC
D Pulsating current

Which device protects an electrical circuit from excessive current?

A Resistor
B Capacitor
C Inductor
D Fuse

What is the function of a circuit breaker?

A Store energy
B Interrupt overcurrent
C Measure current
D Change voltage

What is the purpose of grounding an electrical system?

A Control current
B Increase voltage
C Prevent electric shock
D Store charge

Which component is used to measure the electrical potential difference between two points?

A Voltmeter
B Ammeter
C Ohmmeter
D Wattmeter

What is the most common use of a capacitor in an electrical circuit?

A Limit voltage
B Store energy
C Change current
D Measure resistance

What happens to the total resistance in a parallel circuit?

A It increases
B It stays the same
C It is zero
D It decreases

Which of the following units measures electrical power?

A Ampere
B Volt
C Watt
D Ohm

Which electrical device is used to store electrical charge temporarily?

A Inductor
B Capacitor
C Resistor
D Battery

What is the purpose of a diode in a circuit?

A Convert AC to DC
B Limit voltage
C Store energy
D Measure current

Which type of electrical circuit allows current to flow through multiple paths?

A Series circuit
B Open circuit
C Parallel circuit
D Short circuit

What is the effect of increasing the resistance in a circuit?

A Increases voltage
B Increases current
C No effect
D Decreases current

Which of the following components is used to store electrical energy in a magnetic field?

A Capacitor
B Inductor
C Battery
D Fuse

What is the unit of electric current?

A Ampere
B Watt
C Volt
D Ohm