# Top 50 Electrical MCQ Questions and Answers PDF free – Boost Your Electrical Knowledge 2023

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## Introduction

Electrical engineering is a highly specialized field that requires extensive knowledge and understanding of electrical concepts and principles. To become a successful electrical engineer, one needs to have a strong foundation of theoretical knowledge and practical skills. MCQs or Multiple Choice Questions are an excellent way to assess one’s understanding of complex topics in electrical engineering. In this article, we will share the top 50 electrical MCQ questions and answers PDF that will help you improve your knowledge and test your skills.

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## top 50-50 MCQ “Basic Electrical Engineering” with answers

```What is the SI unit of electric charge?
A. Ampere
B. Volt
C. Coulomb
D. Ohm

Which law states that the induced emf in a circuit is proportional to the rate of change of magnetic flux through the circuit?
A. Kirchhoff's voltage law
B. Lenz's law
C. Faraday's law of electromagnetic induction
D. Ampere's law

The SI unit of resistance is:
A. Henry
B. Ohm
C. Volt
D. Watt

In a series circuit, the total resistance is:
A. The sum of the individual resistances
B. The product of the individual resistances
C. The difference of the individual resistances
D. None of the above
Answer: A. The sum of the individual resistances

What is the purpose of a diode?
A. To store electrical charge
B. To regulate voltage
C. To amplify signals
D. To allow current to flow in only one direction
Answer: D. To allow current to flow in only one direction

Which type of current flows in a battery-powered flashlight?
A. Alternating current (AC)
B. Direct current (DC)
C. Pulsed current
D. None of the above

Which law states that the current flowing through a conductor between two points is directly proportional to the voltage across the two points?
A. Ohm's law
B. Kirchhoff's current law
D. Lenz's law

What is the SI unit of electric potential?
A. Ampere
B. Volt
C. Coulomb
D. Ohm

What is the unit of electric power?
A. Joule
B. Watt
C. Volt
D. Ampere

What is the relationship between power, voltage, and current?
A. Power = voltage x current
B. Power = voltage / current
C. Power = current / voltage
D. None of the above
Answer: A. Power = voltage x current

Which device is used to measure electric current?
A. Voltmeter
B. Ammeter
C. Oscilloscope
D. Multimeter

Which type of motor is used in electric vehicles?
A. AC motor
B. DC motor
C. Stepper motor
D. None of the above

What is the difference between a conductor and an insulator?
A. A conductor allows current to flow easily, while an insulator does not.
B. A conductor does not allow current to flow easily, while an insulator does.
C. A conductor is magnetic, while an insulator is not.
D. None of the above
Answer: A. A conductor allows current to flow easily, while an insulator does not.

Which type of circuit is used to protect electrical appliances from excessive current?
A. Series circuit
B. Parallel circuit
C. Fuse circuit
D. None of the above

What is the function of a transformer?
A. To convert DC to AC
B. To convert AC to DC
C. To increase or decrease the voltage of an AC circuit
D. None of the above
Answer: C. To increase or decrease the voltage of an AC circuit

Which law states that the sum of the currents entering and leaving a junction in a circuit must be zero?
A. Kirchhoff's voltage law
B. Ohm's law
D. Kirchhoff's current law

What is the purpose of a capacitor?
A. To store electrical charge
B. To regulate voltage
C. To amplify signals
D. To allow current to flow in only one direction
Answer: A. To store electrical charge

What is the symbol for a resistor in a circuit diagram?
A. R
B. C
C. L
D. D

What is the difference between a series circuit and a parallel circuit?
A. In a series circuit, the current flows through each component in turn, while in a parallel circuit, the current is divided among the components.
B. In a series circuit, the voltage is the same across each component, while in a parallel circuit, the voltage is different across each component.
C. In a series circuit, the resistance is the same across each component, while in a parallel circuit, the resistance is different across each component.
D. All of the above
Answer: D. All of the above

Which type of wire is used as a ground wire?
A. Black wire
B. Green wire
C. Red wire
D. White wire

What is the purpose of a fuse in a circuit?
A. To regulate voltage
B. To amplify signals
C. To protect electrical appliances from excessive current
D. To allow current to flow in only one direction
Answer: C. To protect electrical appliances from excessive current

What is the difference between an AC circuit and a DC circuit?
A. In an AC circuit, the current changes direction periodically, while in a DC circuit, the current flows in only one direction.
B. In an AC circuit, the voltage is constant, while in a DC circuit, the voltage changes periodically.
C. In an AC circuit, the resistance is constant, while in a DC circuit, the resistance changes periodically.
D. None of the above
Answer: A. In an AC circuit, the current changes direction periodically, while in a DC circuit, the current flows in only one direction.

Which law states that the voltage around any closed loop in a circuit must be zero?
A. Kirchhoff's voltage law
B. Ohm's law
D. Kirchhoff's current law

What is the difference between a battery and a capacitor?
A. A battery stores energy as chemical potential energy, while a capacitor stores energy as electrical potential energy.
B. A battery stores energy as electrical potential energy, while a capacitor stores energy as magnetic potential energy.
C. A battery stores energy as heat, while a capacitor stores energy as light.
D. None of the above
Answer: A. A battery stores energy as chemical potential energy, while a capacitor stores energy as electrical potential energy.

What is the purpose of a rectifier?
A. To convert DC to AC
B. To convert AC to DC
C. To regulate voltage
D. None of the above
Answer: B. To convert AC to DC

What is the difference between an open circuit and a closed circuit?
A. In an open circuit, the current cannot flow, while in a closed circuit, the current can flow.
B. In an open circuit, the voltage is not constant, while in a closed circuit, the voltage is constant.
C. In an open circuit, the resistance is high, while in a closed circuit, the resistance is low.
D. All of the above
Answer: A. In an open circuit, the current cannot flow, while in a closed circuit, the current can flow.

What is the purpose of a transformer?
A. To convert AC to DC
B. To convert DC to AC
C. To increase or decrease voltage in an AC circuit
D. None of the above
Answer: C. To increase or decrease voltage in an AC circuit

What is the unit of electrical power?
A. Volt
B. Ampere
C. Watt
D. Ohm

What is the unit of electrical resistance?
A. Volt
B. Ampere
C. Watt
D. Ohm

What is the unit of electrical current?
A. Volt
B. Ampere
C. Watt
D. Ohm

What is the relationship between voltage, current, and resistance in an electric circuit?
A. Voltage is proportional to current and inversely proportional to resistance.
B. Current is proportional to voltage and inversely proportional to resistance.
C. Resistance is proportional to voltage and inversely proportional to current.
D. None of the above
Answer: B. Current is proportional to voltage and inversely proportional to resistance.

What is the formula for calculating electrical power?
A. P = VI
B. P = V/R
C. P = I/R
D. All of the above

What is the formula for calculating electrical resistance?
A. R = V/I
B. R = P/I2
C. R = V2/P
D. All of the above

What is the formula for calculating electrical current?
A. I = V/R
B. I = P/V
C. I = P/R
D. All of the above

What is the difference between a conductor and an insulator?
A. A conductor allows electricity to flow through it easily, while an insulator does not.
B. An insulator allows electricity to flow through it easily, while a conductor does not.
C. A conductor is a material with a high resistance, while an insulator is a material with a low resistance.
D. None of the above
Answer: A. A conductor allows electricity to flow through it easily, while an insulator does not.

What is the difference between a motor and a generator?
A. A motor converts electrical energy into mechanical energy, while a generator converts mechanical energy into electrical energy.
B. A motor converts mechanical energy into electrical energy, while a generator converts electrical energy into mechanical energy.
C. A motor and a generator are the same thing.
D. None of the above
Answer: A. A motor converts electrical energy into mechanical energy, while a generator converts mechanical energy into electrical energy.

What is the purpose of a circuit breaker?
A. To regulate voltage
B. To amplify signals
C. To protect electrical appliances from excessive current
D. To allow current to flow in only one direction
Answer: C. To protect electrical appliances from excessive current

What is the difference between a watt and a kilowatt?
A. A kilowatt is equal to 1000 watts.
B. A watt is equal to 1000 kilowatts.
C. A watt and a kilowatt are the same unit of measurement.
D. None of the above
Answer: A. A kilowatt is equal to 1000 watts.

What is the purpose of a capacitor?
A. To store electrical energy
B. To convert AC to DC
C. To amplify signals
D. To protect electrical appliances from excessive current
Answer: A. To store electrical energy

What is the purpose of a diode?
A. To store electrical energy
B. To convert AC to DC
C. To amplify signals
D. To allow current to flow in only one direction
Answer: D. To allow current to flow in only one direction

What is the purpose of an inductor?
A. To store electrical energy
B. To convert AC to DC
C. To amplify signals
D. To resist changes in current flow
Answer: D. To resist changes in current flow

What is the difference between a series circuit and a parallel circuit?
A. In a series circuit, the components are connected in a single path, while in a parallel circuit, the components are connected in multiple paths.
B. In a series circuit, the components are connected in multiple paths, while in a parallel circuit, the components are connected in a single path.
C. A series circuit and a parallel circuit are the same thing.
D. None of the above
Answer: A. In a series circuit, the components are connected in a single path, while in a parallel circuit, the components are connected in multiple paths.

What is the purpose of a resistor?
A. To store electrical energy
B. To convert AC to DC
C. To regulate voltage
D. To limit the flow of current
Answer: D. To limit the flow of current

What is the purpose of a transistor?
A. To store electrical energy
B. To amplify signals
C. To regulate voltage
D. To allow current to flow in only one direction

What is the difference between an AC circuit and a DC circuit?
A. In an AC circuit, the current flows in one direction, while in a DC circuit, the current flows in both directions.
B. In an AC circuit, the voltage is constant, while in a DC circuit, the voltage varies.
C. In an AC circuit, the voltage varies, while in a DC circuit, the voltage is constant.
D. None of the above
Answer: C. In an AC circuit, the voltage varies, while in a DC circuit, the voltage is constant.

What is the difference between a fuse and a circuit breaker?
A. A fuse is a one-time use device, while a circuit breaker can be reset and used multiple times.
B. A circuit breaker is a one-time use device, while a fuse can be reset and used multiple times.
C. A fuse and a circuit breaker are the same thing.
D. None of the above
Answer: A. A fuse is a one-time use device, while a circuit breaker can be reset and used multiple times.

What is the purpose of a potentiometer?
A. To store electrical energy
B. To convert AC to DC
C. To regulate voltage
D. To vary resistance

What is the difference between a generator and an alternator?
A. A generator produces DC power, while an alternator produces AC power.
B. A generator produces AC power, while an alternator produces DC power.
C. A generator and an alternator are the same thing.
D. None of the above
Answer: A. A generator produces DC power,

What is the difference between a watt and a volt-ampere?
A. A watt and a volt-ampere are the same unit of measurement.
B. A watt is a measure of real power, while a volt-ampere is a measure of apparent power.
C. A watt is a measure of apparent power, while a volt-ampere is a measure of real power.
D. None of the above
Answer: B. A watt is a measure of real power, while a volt-ampere is a measure of apparent power.

What is the purpose of a transformer?
A. To store electrical energy
B. To convert AC to DC
C. To amplify signals
D. To change the voltage level of an AC power supply
Answer: D. To change the voltage level of an AC power supply.```