Introduction to Electrical Engineering MCQs (Part-7)

What is the primary function of a circuit breaker?

A Increase current
B Measure power
C Prevent overloads
D Control voltage

What does an electrical fuse do?

A Store energy
B Prevent circuit overload
C Increase current
D Measure voltage

What is the purpose of grounding in an electrical system?

A Increase resistance
B Measure current
C Control voltage
D Provide a safe path for current

Which of the following materials is commonly used for electrical wiring?

A Copper
B Rubber
C Wood
D Glass

What is the role of a capacitor in an electrical circuit?

A Increase voltage
B Store energy
C Control current
D Measure resistance

What is the main benefit of energy conservation?

A Reduces energy costs
B Increases resistance
C Increases current flow
D Reduces voltage

What is the unit of electrical energy?

A Watt-hour
B Volt
C Ampere
D Joule

How is energy consumed in a circuit?

A As sound
B As heat
C As light
D All of the above

What is the primary cause of electrical hazards?

A Short circuits
B Low resistance
C Overloaded circuits
D High voltage

What does an ammeter measure in a circuit?

A Power
B Voltage
C Current
D Resistance

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

A Control current flow
B Increase voltage
C Convert energy to light
D Store energy

What is the unit of resistance?

A Watt
B Volt
C Ohm
D Ampere

What is a short circuit?

A A circuit with too much current
B A path with no resistance
C A faulty switch
D A complete circuit with no current

What does Ohm’s Law describe?

A Relationship between voltage, current, and resistance
B Relationship between voltage and power
C Relationship between current and energy
D Relationship between energy and power

How can electrical energy be conserved?

A Increase voltage
B Use more power
C Use thicker wires
D Use energy-efficient devices