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Electrical Engineering

Basics of Electrical Engineering MCQ (Interview-Exam) Question-Answer

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Basics of Electrical Engineering MCQ (Interview-Exam) Question-Answer
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Q.1 What is constant for a charged spherical shell according to basic electrical energy?

       A. Electrical potential inside the spherical shell

       B. Electrical field inside the spherical shell

       C. Electrical potential outside the spherical shell

       D. Electrical field outside the spherical shell

Ans : Electrical potential inside the spherical shell


Q.2 Which of the following elements of electrical engineering cannot be analyzed using Ohm’s law?

       A. Inductors

       B. Resistance

       C. Capacitors

       D. Transistors

Ans : Transistors


Q.3 Which of the following is a correct representation of peak value in an AC Circuit?

       A. RMS value*Form factor

       B. RMS value*Peak factor

       C. RMS value/Peak factor

       D. RMS value/Form factor

Ans : RMS value*Peak factor


Q.4 Where does electro-static shielding occur in a charged spherical shell?

       A. When electrical potential inside the spherical shell is zero

       B. Electrical field inside the spherical shell

       C. When electrical potential outside spherical shell is zero

       D. When electrical field outside the spherical shell

Ans : Electrical field inside the spherical shell


Q.5 How many cycles will an AC signal make in 2 seconds if its frequency is 100 Hz?

       A. 50

       B. 100

       C. 150

       D. 200

Ans : 200


Q.6 Which of the following according to fundaments of electrical energy is correct about alternating current?

       A. Magnitude changes with time

       B. Flows in both directions

       C. Frequency is zero

       D. Can be transported to larger distances with less loss in power

Ans : Frequency is zero


Q.7 What will be the current density of metal if a current of 30A is passed through a cross-sectional area of 0.5m2?

       A. 15 A/m²

       B. 120 A/m²

       C. 7.5 A/m²

       D. 60 A/m²

Ans : 60 A/m²


Q.8 What will be the direction of the drift velocity of electrons change with respect to the electric field?

       A. perpendicular to that of the electric field in a positive direction

       B. perpendicular to that of the electric field in a negative direction

       C. same as that of electric field

       D. opposite to that of electric field

Ans : opposite to that of electric field


Q.9 What is zero for a charged spherical shell?

       A. Electrical potential inside the spherical shell

       B. Electrical field inside the spherical shell

       C. Electrical potential outside the spherical shell

       D. Electrical field outside the spherical shell

Ans : Electrical field inside the spherical shell


Q.10 Which of the following is correct about the power consumed by R1 and R2 connected in series if the value of R1 is greater than R2?

       A. R2 will consume more power

       B. The relationship between the power consumed cannot be established

       C. R1 will consume more power

       D. R1 and R2 will consume the same power

Ans : R1 will consume more power


Q.11 What do crowded lines of force indicate?

       A. Weak electric field

       B. Weak electric potential

       C. Strong electric field

       D. Strong electric potential

Ans : Strong electric field


Q.12 What kind of quantity is an Electric potential?

       A. Tensor quantity

       B. Dimensionless quantity

       C. Vector quantity

       D. Scalar quantity

Ans : Scalar quantity


Q.13 What is the magnitude of mutually induced emf, E2 in a transformer?

       A. inversely proportional to rate of change of flux and number of secondary turns

       B. inversely proportional to the rate of change of flux and proportional to number of secondary turns

       C. directly proportional to rate of change of flux and number of secondary turns

       D. proportional to rate of change of flux and inversely proportional to number of secondary turns

Ans : directly proportional to rate of change of flux and number of secondary turns


Q.14 What is the direction of the electric field at a point?

       A. Along the line tangent to the electric field

       B. Electric field has a random direction

       C. Along the line perpendicular to the electric field

       D. Electric field has no direction

Ans : Along the line tangent to the electric field


Q.15 What is the number of primary turns in a 200/1000 V transformer if the emf per turn is 10V?

       A. 5

       B. 10

       C. 20

       D. 40

Ans : 20


Q.16 Which of the following will happen in a transformer when the number of secondary turns is less than the number of primary turns?

       A. State

       B. The power gets stepped down

       C. The voltage gets stepped up

       D. The power gets stepped up

Ans : The voltage gets stepped down


Q.17 Who defined electric current and devised a method to measure current?

       A. Andre-Marie Ampere

       B. Alessandro Antonio Volta

       C. Michael Faraday

       D. Nikola Tesla

Ans : Andre-Marie Ampere


Q.18 Which of the following is a correct representation of average value in an AC Circuit?

       A. RMS value*Form factor

       B. RMS value*Peak factor

       C. RMS value/Form factor

       D. RMS value/Peak factor

Ans : RMS value/Form factor


Q.19 Which of the following is correct about direct current?

       A. Frequency is zero

       B. Flows in one direction

       C. Magnitude is constant

       D. Can be transported to larger distances with less loss in power

Ans : Can be transported to larger distances with less loss in power


Q.20 How many electrons will constitute 2 Coulombs of electric charge?

       A. 12.48 * 10^18 electrons

       B. 3.204 * 10^19 electrons

       C. 6.24 * 10^18 electrons

       D. 1.602 * 10^19 electrons

Ans : 12.48 * 10^18 electrons


Q.21 Which of the following according is correct about electrical conductivity?

       A. It is the product of current density and electric field

       B. It is the reciprocal of the product of current density and electric field

       C. It is the ratio of current density to the electric field

       D. It is the ratio of the electric field to current density

Ans : It is the ratio of current density to the electric field


Q.22 Who witnessed the effect of magnetism for the first time?

       A. Alexander Graham Bell

       B. Gustav Robert Kirchhoff

       C. Hans Christian Orsted

       D. Michael Faraday

Ans : Hans Christian Orsted


Q.23 Which of the following according to KCL must be zero?

       A. Algebraic sum of power in closed-loop

       B. Algebraic sum of voltages across the input and output

       C. Algebraic sum of currents in closed-loop

       D. Algebraic sum of currents entering and leaving a junction

Ans : Algebraic sum of power in closed-loop


Q.24 What is responsible for the current to flow?

       A. Electrons

       B. Protons and Electrons

       C. Protons

       D. Nucleus

Ans : Electrons


Q.25 Which of the following will happen in a transformer when the number of secondary turns is greater than the number of primary turns?

       A. The voltage gets stepped down

       B. The power gets stepped down

       C. The voltage gets stepped up

       D. The power gets stepped up

Ans : The voltage gets stepped up


Q.26 How many directions can the electric field at a point have?

       A. 0

       B. 1

       C. 2

       D. Many

Ans : 1


Q.27 Which of the following according to the fundamentals of electrical engineering is correct about the induced emf in primary of transformer?

       A. It is the product of primary turns and emf induced per turn

       B. It is the product of secondary turns and emf induced per turn

       C. It is the ratio of primary turns to emf induced per turn

       D. It is the ratio of secondary turns to emf induced per turn

Ans : It is the product of primary turns and emf induced per turn


Q.28 Which of the following is correct about the voltage transformation ratio in electrical engineering?

       A. Ratio of induced emf in secondary to induced emf in primary

       B. Ratio of power in primary to power in secondary

       C. Ratio of number of primary turns to the number of secondary turns

       D. Ratio of secondary current to the primary current

Ans : Ratio of induced emf in secondary to induced emf in primary


Q.29 What does positive power in an electrical element indicate?

       A. Element is supplying power

       B. Element is neither absorbing nor supplying power

       C. Element is absorbing power

       D. Element may absorb or supply power

Ans : Element is absorbing power


Q.30 Which of the following current is drawn by the primary circuit of an ideal transformer when the secondary is open?

       A. Leakage current

       B. Working on current

       C. Secondary current

       D. Magnetizing current

Ans : Magnetizing current


Q.31 Which of the following type of circuits in electrical engineering cannot be analyzed using Ohm’s law?

       A. Bilateral

       B. Conductors

       C. Unilateral

       D. Linear

Ans : Unilateral


Q.32 How does induce emf in DC motor react to supply voltage?

       A. It will be double the supply voltage

       B. It will be half of the supply voltage

       C. It will aid the supply voltage

       D. It will oppose the supply voltage

Ans : It will oppose the supply voltage


Q.33 Which of the following according to KVL must be zero?

       A. Algebraic sum of power in closed-loop

       B. Algebraic sum of voltages in closed-loop

       C. Algebraic sum of currents in closed-loop

       D. Algebraic sum of losses in closed-loop

Ans : Algebraic sum of voltages in closed-loop


 

Electrical engineering is a branch of engineering that deals with the study, design, and application of electricity, electronics, and electromagnetism. It encompasses a broad range of topics and applications, playing a crucial role in the development and maintenance of modern technology. Here are some key aspects of basic electrical engineering:

  1. Circuit Theory: Understanding the fundamentals of electrical circuits is essential. This includes concepts like voltage, current, resistance, and the various laws governing their behavior, such as Ohm’s Law and Kirchhoff’s Laws.
  2. Electronics: Electronics is a major subset of electrical engineering, focusing on the study of electronic components like diodes, transistors, and integrated circuits. Electronic circuits form the foundation of many modern devices and systems.
  3. Power Systems: Power systems deal with the generation, transmission, and distribution of electrical power. Engineers in this field work on designing efficient and reliable systems for delivering electricity to homes, industries, and businesses.
  4. Electromagnetism: Understanding the principles of electromagnetism is crucial in electrical engineering. This includes concepts like magnetic fields, electromagnetic induction, and the interaction between electric currents and magnetic fields.
  5. Signal Processing: Signal processing involves the analysis, manipulation, and interpretation of signals, which can be electrical, audio, or visual in nature. This field is essential in areas like telecommunications, audio processing, and image processing.
  6. Control Systems: Control systems engineering focuses on designing systems that regulate the behavior of dynamic systems. This is crucial in applications such as robotics, automation, and industrial processes.
  7. Digital Systems: Digital systems involve the study of digital circuits and systems, including binary logic, digital signal processing, and digital communication. This forms the basis for the design and implementation of digital devices and computers.
  8. Instrumentation: Instrumentation deals with the design and implementation of measuring instruments and devices. Engineers in this field create tools for monitoring and controlling various physical parameters in industrial, scientific, and medical applications.
  9. Renewable Energy: With the growing emphasis on sustainability, electrical engineers often work on developing and improving renewable energy technologies such as solar power, wind power, and energy storage systems.
  10. Safety and Standards: Electrical engineers must adhere to safety standards and regulations in their designs to ensure the reliability and safety of electrical systems. This includes considerations for electrical codes, grounding, and protection against electrical hazards.
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