Electricity and Magnetism Practice Quiz 07

Electricity and Magnetism Practice Quiz 07

Welcome to ECE Board Exam Practice Quiz for Electricity and Magnetism Fundamentals. This set of practice quiz 7 will test your competence on the theories, concepts and problem solving involving Electricity and Magnetism. The objectives and goals of this quiz is to help engineering students familiarize concepts and theories as well as develop problem solving skills when answering questions related to the Electricity and Magnetism Fundamentals.

Electricity and Magnetism Test Bank

In this section are compiled practice quiz for Electricity and Magnetism that could be able to enhance your knowledge and skills in your preparation for the ECE Board Exam. The goal is to add thousands of questions for you to be familiarized and hopefully help you to be prepared. I am looking forward that this practice quiz will give you an additional confidence in taking your upcoming Engineering Board Exam.

Guidelines:
  • Read and understand each question before choosing the best answer.
  • The correct answer will be reveal after you have chosen your answer for every questions
  • There is no time limit, answer the questions at your own pace.
  • Once all questions are answered, you will be shown your rating.
  • You have to get 70% of the total items to pass the quiz.
  • You can re-take the quiz as many times as you want or until you are satisfied of your rating.
  • Comment us your thoughts, scores, ratings, and questions about the quiz in the comments section below!

Choose the letter of the best answer in each questions.

A factor used to correct for the electrostatic forces of the more distant ions in an ionic solid.
Avogadro’s number
Planck’s constant
Boltzmann’s constant
Madelung constant

Correct!

Wrong!

The magnetic field around the conductor is determined by the
Size of the conductor
Amount of current
Current divided by the resistance
Resistance divided by the current

Correct!

Wrong!

What determines the atomic number of an element?
The number of protons
The number of electrons
The number of neutrons
The number of neutrons and protons

Correct!

Wrong!

What bond is formed when one or more electrons in the outermost energy orbit of an atom are transferred to another?
Ionic
Covalent
Metallic
Van der Waals

Correct!

Wrong!

The reluctance of the magnetic circuit is _________ relative permeability of the material comprising the circuit.
directly proportional to
inversely proportional to
independent of
dependent of

Correct!

Wrong!

The phenomenon that when an electric current passes through an anisotropic crystal, there is an absorption or liberation of heat due to the non-uniformity in current distribution.
Bridgman effect
Corona effect
Dember effect
Destriau effect

Correct!

Wrong!

What bond is formed when electrons in the outermost energy orbits of the atoms are shared between two or more electrons?
Ionic
Covalent
Metallic
Van der Waals

Correct!

Wrong!

How is mutual inductance between two coils decreased?
By using a common core
By moving the coils closer
By moving the coils apart
By increasing the number of turns of either coil

Correct!

Wrong!

The science of adapting electronics to aerospace flight.
Avionics
Aerotronics
Aerodynamics
Astrionics

Correct!

Wrong!

Another term for corona discharge.
Lightning
Sparking
Aurora
Corona Effect

Correct!

Wrong!

What type of bond is formed when there exists some form of collective interactions between the (negatively charged) electrons and (positively charged) nuclei in a solid?
Ionic
Covalent
Metallic
Van der Waals

Correct!

Wrong!

How many turns are needed to produce a magnetomotive force of 1000 A.t for a coil with 6 amperes?
6000 turns
600 turns
167 turns
67 turns

Correct!

Wrong!

A magnetizing force of 1000 AT/m will produce a flux density of ______ in air.
1.257 mWb/m^2
0.63 Wb/m^2
1.257 Wb/m^2
0.63 mWb/m^2

Correct!

Wrong!

If a magnetic flux cuts across 200 turns at a rate of 2 Wb/s, the induced voltage according to Faraday’s law is about
400 V
100 V
200 V
600 V

Correct!

Wrong!

Calculate the permeability (in T/A. t/m) of a magnetic material that has a relative permeability of 300
3.78 x 10^-4
3.78 x 10^-5
3.78 x 10^-3
3.78 x 10^-6

Correct!

Wrong!

A magnetic circuit carries a flux φi in the iron part and a flux φg in the air gap. What is the leakage coefficient?
φi/ φg
φi × φg
φg /φi
φi + φg

Correct!

Wrong!

Ohm’s law can be used only to a _________ circuit or component.
Unilateral
Exponential
Trivalent
Linear

Correct!

Wrong!

Theory of ferromagnetic phenomena which assumes each atom is a permanent magnet which can turn freely about its center under the influence of applied field and other magnets.
Ewing’s theory of ferromagnetism
Oersted’s ferromagnetism theory
Maxwell’s magnetic theory
Ampere’s circuital law

Correct!

Wrong!

Formed when there exist distant electronic interactions between (opposite) charges present in the neighboring atoms or molecules.
Ionic bond
Covalent bond
Metallic bond
Van der Waals bond

Correct!

Wrong!

The core of a transformer heats up when its primary is fed from an ac source because of
permeability
ferromagnetism
reluctance of core
hysteresis loss

Correct!

Wrong!

The magnetic flux through a coil changes. This results to the induced emf acting in a direction as to
Oppose the change
Aid the change
Either oppose or aid the change
Neither oppose nor aid the change

Correct!

Wrong!

If a 20 V potential is applied across a relay coil with 50 turns having 1 Ω of resistance, the total magnetomotive producing magnetic flux in the circuit is
10 Wb
50 T
1000 A t/m
1000 A.t

Correct!

Wrong!

Amorphous solid is also called
Crystalline
Non-crystalline
Polycrystalline
Homogenous

Correct!

Wrong!

Mmf in a magnetic circuit corresponds to ________ in an electric circuit
Emf
Voltage drop
Electric Field Intensity
Potential gradient

Correct!

Wrong!

A theorem which states that an electric current flowing in a circuit produces a magnetic field at external points equivalent to that due to a magnetic shell whose bounding edge is the conductor and whose strength of the current.
Joule’s law
Faraday’s law
Volta’s theorem
Ampere’s theorem

Correct!

Wrong!

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