Basic Electrical Engineering MCQs (Part-6)

What is the main purpose of an electric fuse?

A To store energy
B To increase current
C To protect appliances from overcurrent
D To convert AC to DC

Which law relates the voltage, current, and resistance in an electrical circuit?

A Kirchhoff’s Voltage Law
B Ohm’s Law
C Faraday’s Law
D Lenz’s Law

What type of conductor does not obey Ohm’s Law?

A Ohmic conductor
B Non-ohmic conductor
C Ideal conductor
D Pure conductor

What does an electric motor convert?

A Electrical energy into thermal energy
B Mechanical energy into electrical energy
C Electrical energy into mechanical energy
D Chemical energy into electrical energy

Which quantity remains constant in a parallel circuit?

A Current
B Resistance
C Voltage
D Power

What is the unit of electrical resistance?

A Ampere
B Coulomb
C Ohm
D Volt

What happens to the total resistance when resistors are connected in series?

A It increases
B It decreases
C It remains constant
D It becomes zero

Which of the following devices is used to measure electric current?

A Ammeter
B Voltmeter
C Ohmmeter
D Thermometer

Which type of transformer increases voltage?

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

What is the primary function of a rectifier?

A To increase resistance
B To convert DC to AC
C To convert AC to DC
D To step up voltage

Which component is used to store charge in an electrical circuit?

A Resistor
B Inductor
C Capacitor
D Transformer

What is the effect of temperature on the resistance of a metallic conductor?

A Resistance increases with temperature
B Resistance decreases with temperature
C Resistance remains constant
D Resistance becomes zero

What is the frequency of AC supply in the USA?

A 50 Hz
B 60 Hz
C 100 Hz
D 25 Hz

What is the primary cause of energy loss in a transformer?

A Copper loss
B Eddy current loss
C Hysteresis loss
D All of the above

What is the role of an Earth wire in a circuit?

A To carry the load current
B To protect against electric shock
C To increase voltage
D To measure resistance

What type of energy is produced in a generator?

A Mechanical energy
B Chemical energy
C Electrical energy
D Thermal energy

What is the main factor that determines the capacitance of a capacitor?

A Resistance of the circuit
B Distance between plates
C Length of wire
D Frequency of the supply

What happens when a conductor moves through a magnetic field?

A No effect
B Current is induced in the conductor
C Resistance increases
D Magnetic field decreases

What is the purpose of insulation on electrical wires?

A To conduct electricity
B To prevent current leakage
C To increase voltage
D To reduce power loss

Which type of current flows in one direction only?

A Alternating Current (AC)
B Direct Current (DC)
C Pulsating Current
D Static Current

Which of the following devices is used to measure electric current?

A Ammeter
B Voltmeter
C Ohmmeter
D Thermometer