Introduction to Electrical Engineering MCQs (Part-8)

What does Kirchhoff’s Voltage Law (KVL) state?

A The total current entering a junction equals the current leaving it.
B The total voltage around a closed loop is zero.
C Voltage is directly proportional to current.
D Current remains constant in a circuit.

Which material is commonly used as a dielectric in capacitors?

A Copper
B Paper
C Aluminum
D Silicon

What does the term “electromotive force (EMF)” refer to?

A The force between two charges
B The energy supplied by a source per unit charge
C The resistance of a circuit
D The current in a circuit

Which device protects a circuit from excessive current?

A Inductor
B Capacitor
C Fuse
D Diode

Which law governs the relationship between force, current, and magnetic field in an electric motor?

A Faraday’s Law
B Lenz’s Law
C Fleming’s Left-Hand Rule
D Kirchhoff’s Law

What is the purpose of a transformer in an electrical system?

A To generate electricity
B To step up or step down voltage
C To convert AC to DC
D To store energy

What does the term “impedance” refer to in an AC circuit?

A Opposition to direct current
B Opposition to alternating current
C Voltage drop across a resistor
D Capacitance in the circuit

What happens to the total resistance in a parallel circuit when more resistors are added?

A Increases
B Decreases
C Remains the same
D Doubles

Which component allows current to flow only in one direction?

A Resistor
B Capacitor
C Diode
D Inductor

What is the primary purpose of grounding in electrical systems?

A To increase voltage
B To prevent overloading
C To provide a safe path for fault currents
D To regulate power

What is the frequency of standard AC supply in India?

A 50 Hz
B 60 Hz
C 100 Hz
D 120 Hz

Which component stores energy in the form of an electric field?

A Resistor
B Capacitor
C Inductor
D Transformer

What is the SI unit of electric field strength?

A Weber
B Volt per meter
C Coulomb
D Ampere

What is the function of a voltmeter?

A Measure current
B Measure voltage
C Measure resistance
D Measure power

What does a current transformer (CT) do?

A Steps up voltage
B Steps down current
C Converts AC to DC
D Stores energy

Which component is used to oppose sudden changes in current?

A Capacitor
B Resistor
C Inductor
D Diode

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

A Increase voltage
B Limit current
C Store charge
D Amplify signals

What happens when a conductor is moved through a magnetic field?

A A force is generated
B A current is induced
C Voltage is decreased
D Resistance increases

What is the unit of electrical energy?

A Joule
B Watt
C Ohm
D Volt

Which type of semiconductor is formed by adding pentavalent impurities?

A N-type
B P-type
C Intrinsic
D Insulator