# Electrical Circuit Practice Quiz 04 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:
• 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.

The reactance curve is a plot of frequency versus ________ for a series RLC circuit.
Current
Voltage
Gain
Impedance

### 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

### 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

### 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

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The impedance in the study of electronics is represented by resistance and
Inductance
Capacitance
Inductance and capacitance
Reactance

### Wrong!

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

### Wrong!

Voltage resonance means
Series resonance
Parallel resonance
Current magnification
Gain magnification

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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.

### Wrong!

The graph between an alternating quantity and time is called
Sine wave
Curve
Waveform
A plot

### Wrong!

The farad is not equivalent to which of the following combination of units
CV­^2
C^2/J
C/V
J/V^2

### 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°

### 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

### Wrong!

Which of the following does not refer to electrical energy?
Volt-ampere
Joule
Watt-second
Volt-coulomb

### Wrong!

In a rectangular wave, the peak factor is
1.16
1.73
1.11
1.0

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“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

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In a pure capacitance,
Current lags voltage by 90˚
Current lags voltage by 180˚

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And ideal current source has an internal conductance of _________ siemen(s)
Infinite
One
Zero
One million

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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

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A capacitor is basically constructed of
Two conductors separated by a dielectric
Two dielectric separated by a conductor
Conductors and dielectric
Conductors and semiconductors

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Points to be considered in choosing a capacitor
Working voltage
Type of dielectric
Capacitance
All of these

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Which of the following does not affect resistance?
Resistivity
Cross-sectional area
Mass
Length

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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

### Wrong!

What is the peak factor for alternating current or voltage varying sinusoidally?
1.4142
0.707
0.636
1.11

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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

### Wrong!

The superposition theorem is used when the circuit contains
Reactive elements
Active elements
Number of voltage sources
Single voltage source

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Electrical Circuit – Quiz 04

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