MCQ in Electricity and Magnetism Fundamentals Part 11 | ECE Board Exam

This is the Multiple Choice Questions Part 11 of the Series in Electricity and Magnetism Fundamentals as one of the Electronics Engineering topic. In Preparation for the ECE Board Exam make sure to expose yourself and familiarize in each and every questions compiled here taken from various sources including but not limited to past Board Exam Questions in 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, Kirchoff 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 11 of the Series

Choose the letter of the best answer in each questions.

501. Magnetic intensity is

A. a vector quantity

B. a scalar quantity

C. an imaginary quantity

D. either a vector or scalar

502. The Gauss is a unit of

A. permeability

B. electromagnetic force

C. magnetic force

D. magnetic flux density

503. What is the unit of flux in cgs?

A. Ampere-turn (At)

B. Coulomb/sec. (C/s)

C. Maxwell (Mx)

D. Gauss

504. One Weber is equivalent to

A. 10^8 Maxwells

B. 10^6 Maxwells

C. 10^4 Maxwells

D. 10^2 Maxwells

505. The equivalent of 1 x 10^9 Maxwells is

A. 1 Weber

B. 10 Weber

C. 100 Weber

D. 1,000 Weber

506. A magnetic flux of 500,000,000 lines is equivalent to

A. 5 x 10^8 Maxwells

B. 5 Weber

C. 500 x 10^6 MAxwells

D. all of these

507. The unit of flux density in mks

A. Gauss

B. Weber/m^2

C. Maxwell

D. Tesla

508. What do you call the force that sets up or tends to set up magnetic flux in a magnetic circuit?

A. electromotive force

B. potential difference

C. magnetomotive force

D. dynamic force

509. Voltage in electrical circuits is analogous to _________ in magnetic circuits.

A. Ampere-turn

B. Magnetomotive force

C. Magnetizing force

D. Flux

510. Electrical current is analogous to _________ in magnetic circuits.

A. Ampere-turn

B. Magnetomotive force

C. Magnetizing force

D. Flux

511. __________ capability is analogous to permeance.

A. Admittance

B. Conductance

C. Reluctance

D. Resistance

512. Resistance in electrical circuits is analogous to _________ in magnetic circuits.

A. Conductance

B. Permeance

C. Elastance

D. reluctance

513. The property of a material which opposes the creation of magnetic flux.

A. elastance

B. permeance

C. susceptance

D. reluctance

214. The reciprocal of reluctance

A. conductance

B. permeance

C. elastance

D. capacitance

515. Permeance is analogous to

A. conductance

B. resistance

C. impedance

D. elastance

516. Is the reciprocal of reluctance and implies the readiness of a material to develop magnetic flux.

A. elastance

B. permeance

C. susceptance

D. conductance

517. Magnetic circuit property that permits flux.

A. elastance

B. permeance

C. susceptance

D. conductance

518. It is easier to establish flux line in soft iron than it is to establish them in air, this is because iron has a lower

A. Permeance

B. Inductance

C. elastance

D. reluctance

519. The Oersted (Oe) is the same as

A. 1 Gb/cm

B. 1 Gb/m

C. 10 Gb/cm

D. 10 Gb/cm

520. The unit of reluctance

A. Gilbert

B. Tesla

C. At/Wb

D. Gauss

521. It is the specific reluctance of a material.

A. resistivity

B. retentivity

C. reluctivity

D. permeability

522. At/m is a unit of

A. magnetic field

B. reluctance

C. magnetizing force

D. magnetic power

523. Magnetomotive force has a unit of

A. Volt (V)

B. Watt (W)

C. Joule (J)

D. Ampere-turn (At)

524. The cgs unit of magnetomotive force

A. Volt

B. Weber

C. Gilbert

D. Ampere-turn

525. One Gilbert is equal to

A. 0.0796 At

B. 0.796 At

C. 7.96 At

D. 79.6 At

526. One Ampere-turn (At) is equivalent to

A. 0.126 Gilbert

B. 1.260 Gilberts

C. 12.60 Gilberts

D. 126 Gilberts

527. The current needed for a coil of 200 turns to provide a 400 ampere turn magnetizing force is

A. 2 A

B. 4 A

C. 6 A

D. 8 A

528. Determine the ampere-turns when a 10 V battery is connected across a solenoid having 100 turns and a resistance of 5 Ω.

A. 50 At

B. 200 At

C. 100 At

D. 1,000 At

529. What is residual magnetism?

A. The external magnetic field when the current is flowing through the exciting coil.

B. The flux density, which exist in the iron core when the magnetic field intensity is reduced to zero.

C. The flux density, which exist in the iron core when the magnetic field intensity is at its maximum value.

D. The flux density when the magnetic core is saturated.

530. When you demagnetize property by applying an AC field and then gradually reduced it to zero, it is called

A. damping

B. decaying

C. degaussing

D. gaussing

531. In a magnetic circuit, a flux that drifts away from its intended path is called

A. lost flux

B. linked flux

C. drift flux

D. leakage flux

532. Is the quantity of magnetizing force needed to counter balance the residual magnetism of a magnetic material.

A. hysteresis

B. degaussing

C. retentivity

D. coercivity

533. What do you call the loss of electrical energy in counter balancing the residual magnetism in each cycle?

A. hysteresis

B. magnetomotive

C. leakage

D. coercivity

534. The amount of magnetic field needed to remove residual magnetism from a transformer core during each half cycle is called the

A. coercive force

B. residual field

C. hysteresis field

D. demagnetizing force

535. If a wire coil has 100 turns and carries 1.3 A of current, calculate the magnetomotive force in Gilbert.

A. 163.3

B. 16.33

C. 1.633

D. 0.1633

536. An advantage of an electromagnet over a permanent magnet

A. An electromagnet can be demagnetized

B. An electromagnet is simpler

C. An electromagnet is cheaper

D. An electromagnet can be switched ON and OFF

537. Electromagnet whose core is in the form of a close magnetic ring

A. solenoid

B. relay

C. toroid

D. circular

538. Magnetic flux can always be attributed to

A. static charged particles

B. motion of charge particles

C. static electric field

D. every applied potential

539. What is a magnetic field?

A. A force set up when current flows through a conductor.

B. A force set up when a charged body is at static.

C. The space between two electrically charged particles.

D. The space around a conductor.

540. Which of the following determines the strength of a magnetic field around a conductor?

A. amount of current

B. diameter of the conductor

C. length of the conductor

D. amount of voltage

541. The magnetic flux around a straight, current carrying wire, is stronger

A. near the edge

B. near the wire

C. at the center

D. at both edge

542. In what direction is the magnetic field about a conductor when current is flowing?

A. In a direction determined by the left-hand rule.

B. Always in a clock wise direction.

C. Always in a counter clockwise direction.

D. In a direction determined by the right-hand screw rule.

543. If the electrical current carried by each of the two long parallel wire is doubled, and their separation is also doubled, the force between them

A. also doubles

B. increases by a factor of four

C. decreases by a factor of four

D. decreases by a factor of two

544. Reversing the flow of current in a circuit

A. reverses the magnetic polarity

B. increase the magnetic field intensity

C. decreases the magnetic intensity

D. enhances hysteresis

545. Is used to maintain strength of magnetic field.

A. storer

B. energizer

C. gausser

D. keeper

546. What law that describes the force of attraction or repulsion between two magnetic poles is directly proportional to their strengths?

A. Coulomb’s first law

B. Coulomb’s second law

C. Ampere’s law

D. Gauss’ law

547. What is the law whereby the force of attraction or repulsion between poles is inversely proportional to the square of the distance between them?

A. Coulomb’s first law

B. Coulomb’s second law

C. Coulomb’s third law

D. Coulomb’s law

548. The physical motion resulting from the forces of magnetic fields.

A. motor action

B. linear motion

C. rectilinear motion

D. generator action

549. What law in electronics where an induced current will be in such a direction that its own magnetic field will oppose the magnetic field that produces the same?

A. Electromagnetic law

B. Norton’s law

C. Lenz law

D. Maxwell law

550. A changing magnetic field

A. produces an electric field

B. induces potential

C. produces a fluctuating electric field

D. produces a steady electric field

Questions and Answers in Electricity and Magnetism Fundamentals

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