Welcome to ECE Board Exam Practice Quiz for Electrical Circuit. This set of practice quiz 4 will test your competence on the theories, concepts and problem solving involving Electrical Circuit. 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 Electrical Circuit.

Electrical Circuit Test Bank

In this section are compiled practice quiz for Electrical Circuit 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.

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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.

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Choose the letter of the best answer in each questions.

The reactance curve is a plot of frequency versus ________ for a series RLC circuit.

Current

Voltage

Gain

Impedance

Correct!

Wrong!

What is the complex impedance of a circuit with an absolute resistance of 300 Ω?

0 + j 300 Ω

300 + j 90 Ω

0 – j 300 Ω

300 + j 0 Ω

Correct!

Wrong!

A law which states that when a constant electromotive force is applied to a circuit consisting of a resistor and capacitor connected in series, the time taken for the potential on the plates of the capacitor to rise to any given fraction of its final value depends only on the product of capacitance and resistance.

Child’s law

CR law

Coulomb’s law

Debye T3 law

Correct!

Wrong!

Which of the statements below is not true?

Current source is an active element

Resistor is a linear element

Voltage source is a passive element

Diode is a non-linear element

Correct!

Wrong!

The impedance in the study of electronics is represented by resistance and

Inductance

Capacitance

Inductance and capacitance

Reactance

Correct!

Wrong!

If three 100-pF capacitors are connected in series, then the total capacitance is

300 pF

100 pF

50 pF

33.3 pF

Correct!

Wrong!

Voltage resonance means

Series resonance

Parallel resonance

Current magnification

Gain magnification

Correct!

Wrong!

Two complex numbers or phasors are said to be conjugate if they

Differ only in the algebraic sign of their quadratic components

Differ only in the algebraic sign of their real components

Are equal in their real and quadrature components including algebraic signs

Are equal in their real components but differ in their quadrature components including algebraic signs.

Correct!

Wrong!

The graph between an alternating quantity and time is called

Sine wave

Curve

Waveform

A plot

Correct!

Wrong!

The farad is not equivalent to which of the following combination of units

CV^2

C^2/J

C/V

J/V^2

Correct!

Wrong!

In an ac circuit with XL and R in series, the

Voltages across R and XL are in phase

Voltage across R lags the voltage across XL by 90°

Voltages across R and XL are 180° out-of-phase

Voltage across R leads the voltage across XL by 90°

Correct!

Wrong!

A factor that states how much the resistance changes for a change in temperature?

Resistivity

Specific resistance

Coefficient of temperature change

Temperature coefficient of resistance

Correct!

Wrong!

Which of the following does not refer to electrical energy?

Volt-ampere

Joule

Watt-second

Volt-coulomb

Correct!

Wrong!

In a rectangular wave, the peak factor is

1.16

1.73

1.11

1.0

Correct!

Wrong!

“Any resistance R in a branch of a network in which a current I is flowing can be replaced by a voltage equal to IR”. This states

Compensation theorem

Reciprocity theorem

Millman’s theorem

Superposition theorem

Correct!

Wrong!

In a pure capacitance,

Current leads voltage by 90˚

Current leads voltage by 180˚

Current lags voltage by 90˚

Current lags voltage by 180˚

Correct!

Wrong!

And ideal current source has an internal conductance of _________ siemen(s)

Infinite

One

Zero

One million

Correct!

Wrong!

What determines the direction of induced emf in a conductor or coil?

Cork screw rule

Fleming’s left hand rule

Ampere’s circuital law

Fleming’s right hand rule

Correct!

Wrong!

A capacitor is basically constructed of

Two conductors separated by a dielectric

Two dielectric separated by a conductor

Conductors and dielectric

Conductors and semiconductors

Correct!

Wrong!

Points to be considered in choosing a capacitor

Working voltage

Type of dielectric

Capacitance

All of these

Correct!

Wrong!

Which of the following does not affect resistance?

Resistivity

Cross-sectional area

Mass

Length

Correct!

Wrong!

The voltage cannot be exactly in phase with the current in a circuit that contains

Only capacitance

Only resistance

Inductance and capacitance

Inductance, capacitance and resistance

Correct!

Wrong!

What is the peak factor for alternating current or voltage varying sinusoidally?

1.4142

0.707

0.636

1.11

Correct!

Wrong!

A 0.09 microfarad capacitor is charged to 220 volts. How long in milliseconds will it discharged resistor has a resistance of 20,000 ohms?

1.5

2.5

1.25

0.5

Correct!

Wrong!

The superposition theorem is used when the circuit contains