MCQ in Electricity and Magnetism Fundamentals Part 12 | ECE Board Exam

This is the Multiple Choice Questions Part 12 of the Series in Electricity and Magnetism Fundamentals as one of the Electronics Engineering topics. In Preparation for the ECE Board Exam make sure to expose yourself and familiarize in each and every question compiled here taken from various sources including but not limited to past Board Exam Questions in the Electronics Engineering field, Electronics Books, Journals and other Electronics References.

MCQ Topic Outline included in ECE Board Exam Syllabi

• MCQ in Atomic Structure
• MCQ in Electric Charge
• MCQ in Ohm’s Law, Kirchhoff Law, Coulomb’s Law, etc
• MCQ in Magnetic Power
• MCQ in Magnetic Field and Magnetic Flux
• MCQ in Magnetic and Electric Quantities / Units
• MCQ in Magnetic/Electromagnet Principles

Continue Practice Exam Test Questions Part 12 of the Series

Choose the letter of the best answer in each questions.

551. The emf induced in a coil due to the change of its flux linked with it is called

A. mutual emf

B. crossfire induced emf

C. self induced emf

D. virtually induced emf

552. If two coils are close enough together for their magnetic fields to interact, a change in current in one will induce a corresponding voltage in the other, This condition is known as

A. self-inductance

B. mutual inductance

C. crossfire inductance

D. linked inductance

553. If the magnetic flux through a coil changes, the induced EMF acts in such a direction as to

A. oppose that change

B. magnify that change

C. augment that change

D. amplify that change

554. When a conductor is moved through a magnetic field a voltage is always induced. The amount of voltage is always proportional to

A. the diameter of the conductor used

B. the length of the conductor

C. the distance of the conductor from the field

D. the rate at which the conductor is moved

555. The term of energy that is stored in an electromagnetic or electrostatic field

A. kinetic energy

B. static energy

C. dynamic energy

D. potential energy

556. What is meant by back EMF?

A. A voltage that is applied in the reverse direction.

B. An EMF that is dude to the fly wheel effect.

C. An EMF that is generated from the back of an electromagnet.

D. A voltage that opposes the applied EMF.

557. When current in a conductor increases, Lenz’ law states that the self-induced potential will

A. produce current opposite to the increasing current

B. tend to produce more magnetic field

C. tend to augment the increase in current

D. produce current with the same direction to the increasing current

558. If a magnetic flux occurs across 100 turns at a rate of 2 Wb/sec. What is the induced voltage as per Faraday’s law?

A. 100 V

B. 400 V

C. 200 V

D. 800 V

559. The circuit element that is used represent the energy stored in a magnetic field.

A. resistance

B. capacitance

C. inductance

D. elastance

560. Which of the given below can produce the most induced voltage?

A. 1 A dc

B. 1 A, 60 Hz

C. 50 A dc

D. 1 A, 400 Hz

561. In all cases of electromagnetic induction, the current set-up by an induced voltage tends to create flux whose direction opposes any change in the existing flux. This law is called

A. Ampere’s law

B. Lenz’ law

C. Coulomb’s law

D. Faraday’s law

562. In electromagnetism, what law that determines the polarity of an induced voltage?

A. Ampere’s law

B. Lenz’ law

C. Coulomb’s law

D. Faraday’s law

563. In electromagnetism, what law that determines the amount of induced voltage?

A. Ampere’s law

B. Lenz’ law

C. Coulomb’s law

D. Faraday’s law

564. Electromotive force (emf) is induced whenever a conductor cuts magnetic flux

A. Faraday’s first law

B. Faraday’s second law

C. Coulomb’s first law

D. Coulomb’s second law

565. The magnitude of electromotive force (emf) that is induced when a conductor cuts magnetic flux is directly proportional to its rate.

A. Faraday’s first law

B. Faraday’s second law

C. Coulomb’s first law

D. Coulomb’s second law

566. The effect that describes the ability of a mechanically stressed ferromagnetic wire to recognize rapid switching of magnetization when subjected to a DC magnetic field.

A. Wiegand effect

B. Wertheim effect

C. Wiedemann effect

D. Wall effect

567. The concept whereby a small voltage is generated by a conductor with current in an external magnetic field is known as

A. Wiegand effect

B. Hall effect

C. Wiedemann effect

D. Wall effect

568. _________ is called the magnetic field.

A. The force that drives current through a resistor

B. Current flow through space around a permanent magnet

C. The force between the plates of charged capacitor

D. A force set up when current flow through a conductor

569. The natural magnet refers to

A. steel

B. soft iron

C. magnesia

D. loadstone (lodestone)

570. The force between two magnetic poles in relation to their pole strength is ________.

A. not related

B. inversely proportional

C. directly proportional

D. independent

Questions and Answers in Electricity and Magnetism Fundamentals

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