Electronics DC Circuits Semester Exam

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Questions: 29 | Attempts: 654

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Learn about the electronics DC Circuits, parallel series circuits, voltages, Ohm's Law among other Physical concepts in the quiz below. Take it up and gauge your mastery on this interesting subject. All the best and enjoy.

Questions and Answers
• 1.

What type of circuit combines one or more series circuits with one or more parallel circuits?

• A.

Simple

• B.

Series

• C.

Series-parallel

• D.

Parallel

Correct Answer
C. Series-parallel
Explanation
A series-parallel circuit combines both series and parallel circuits. In this type of circuit, some components are connected in series, where the current flows through each component one after the other. Other components are connected in parallel, where the current is divided among multiple paths. This combination allows for a mix of resistance and current flow characteristics, making it suitable for various applications where different levels of resistance and current distribution are required.

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• 2.

The first step in calculating voltage drops in a series-parallel circuit is to determine                                                ?

• A.

The resistance of hte parallel resistors

• B.

The resisistance of the series resitors

• C.

Total Current

• D.

Total Voltage

Correct Answer
A. The resistance of hte parallel resistors
Explanation
To calculate voltage drops in a series-parallel circuit, the first step is to determine the resistance of the parallel resistors. This is because the voltage across each parallel resistor will be the same, and knowing the resistance allows us to calculate the current flowing through each resistor. Once we have the current, we can then calculate the voltage drop across each resistor using Ohm's Law (V = I * R). Therefore, determining the resistance of the parallel resistors is crucial in calculating voltage drops in a series-parallel circuit.

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• 3.

Ohm’s Law states that current is _____.

• A.

Inversely proportional to power

• B.

Directly proportional to voltage

• C.

Inversely proportional to voltage

• D.

Directly proportional to resistance

Correct Answer
B. Directly proportional to voltage
Explanation
Ohm's Law states that the current flowing through a conductor is directly proportional to the voltage applied across it. This means that as the voltage increases, the current flowing through the conductor also increases, and vice versa. This relationship is described by the equation I = V/R, where I is the current, V is the voltage, and R is the resistance.

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• 4.

What symbol represents power?

• A.

P

• B.

V

• C.

I

• D.

R

Correct Answer
A. P
Explanation
The symbol "P" represents power. In physics, power is defined as the rate at which work is done or energy is transferred. The letter "P" is commonly used to represent power in equations and formulas.

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• 5.

What happens to current when voltage increases?

• A.

Decreases

• B.

Increases

• C.

Remains the Same

• D.

Who Cares

Correct Answer
B. Increases
Explanation
When the voltage increases, the current also increases. This is because of Ohm's Law, which states that the current flowing through a conductor is directly proportional to the voltage applied across it. As the voltage increases, more potential energy is provided to the charges, causing them to move with greater force and resulting in an increase in current flow.

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• 6.

What is the unit of measure for power?

• A.

Ampere

• B.

Volt

• C.

Watt

• D.

Ohm

Correct Answer
C. Watt
Explanation
The unit of measure for power is watt. Power is the rate at which work is done or energy is transferred or converted. It is calculated by dividing the amount of work or energy by the time taken to do it. The watt is a derived unit of power in the International System of Units (SI), named after the Scottish engineer James Watt. It is defined as one joule per second, representing the amount of power produced or consumed when a current of one ampere flows through a resistance of one ohm.

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• 7.

Current in a series circuit                                                            .

• A.

Varies

• B.

Increases at different points

• C.

Decreases at different points

• D.

Is the same at all points

Correct Answer
D. Is the same at all points
Explanation
In a series circuit, the current is the same at all points. This is because there is only one path for the current to flow through, and the current is not divided or split up. Therefore, the same amount of current passes through each component in the circuit.

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• 8.

What effect on total curret flow will a shorted series component have in a series-paralle circuit?

• A.

Total current will stop

• B.

There will be no effect

• C.

Total current will increase

• D.

Total current will decrease

Correct Answer
C. Total current will increase
Explanation
When a component in a series-parallel circuit is shorted, it creates a path of least resistance for the current to flow. This means that more current will flow through the shorted component, causing the total current in the circuit to increase.

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• 9.

What is the fourth step of the troubleshooting procedure?

• A.

Check the setup

• B.

Check the results

• C.

Analyze the circuit

• D.

Calculate and measure values

Correct Answer
B. Check the results
Explanation
The fourth step of the troubleshooting procedure is to check the results. After analyzing the circuit and calculating and measuring values, it is important to verify if the obtained results align with the expected outcomes. This step helps in identifying any discrepancies or errors in the troubleshooting process and allows for further investigation if needed. By checking the results, one can ensure the accuracy and effectiveness of the troubleshooting procedure.

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• 10.

What would cause a component to drop the applied voltage?

• A.

A decrease in value

• B.

An increase in Value

• C.

A Short

• D.

An Open

Correct Answer
D. An Open
Explanation
An open circuit refers to a break or disconnect in the circuit, which prevents the flow of current. In this scenario, if there is an open in the circuit, it would cause the component to drop the applied voltage because the circuit is incomplete and the voltage cannot reach the component.

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• 11.

Electrical shock occurs when and individual touches                             .

• A.

Electrical Equipment

• B.

Ground and Circuit

• C.

Electrical Components

• D.

Power Supplies

Correct Answer
B. Ground and Circuit
Explanation
When an individual touches both the ground and a live circuit simultaneously, it completes a path for the electrical current to flow through the person's body, resulting in an electrical shock. The ground and circuit together create a closed loop for the electricity to travel, causing harm to the person.

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• 12.

In the event of electrical shock, the rescuer should first

• A.

Perform CPR

• B.

Call for medical help and remove the victim from the electrical source

• C.

Check for breathing

• D.

Call for help

Correct Answer
B. Call for medical help and remove the victim from the electrical source
Explanation
In the event of electrical shock, the rescuer should first call for medical help and remove the victim from the electrical source. This is because the priority is to ensure the safety of both the victim and the rescuer. By calling for medical help, professional assistance can be obtained to provide the necessary treatment for the victim. Removing the victim from the electrical source is crucial to prevent further harm and minimize the risk of additional injuries. Once these immediate steps are taken, further assessment and actions such as checking for breathing and performing CPR can be performed if necessary.

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• 13.

Burns cause by electrical current flowing through the body tissue and bones are called

• A.

Arc Burns

• B.

Thermal Contact Burns

• C.

Electrical Burns

• D.

Shock Burns

Correct Answer
C. Electrical Burns
Explanation
Electrical burns are caused by the flow of electrical current through body tissue and bones. This type of burn occurs when a person comes into contact with an electrical source, such as a live wire or faulty electrical equipment. The electrical current can cause severe damage to the skin, muscles, and organs, and can even lead to internal injuries. Therefore, the correct answer is Electrical Burns.

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• 14.

An electrostatic discharge passing throuh an ESD could cause catastrophic failure, major electrical characteristic changes, or performance degradation in the device.

• A.

True

• B.

False

Correct Answer
A. True
Explanation
An electrostatic discharge passing through an ESD (Electrostatic Discharge) can cause significant damage to a device. This discharge can lead to catastrophic failure, major changes in electrical characteristics, or performance degradation. Hence, the statement is true.

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• 15.

Subtract (4M) - (2M)

• A.

2M

• B.

4M

• C.

6M

• D.

8M

Correct Answer
A. 2M
Explanation
The given question asks us to subtract (4M) - (2M). When subtracting, we subtract the corresponding coefficients of the variables. In this case, we subtract 2M from 4M, which gives us 2M as the answer.

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• 16.

What keeps an electron in orbit around the nucleus?

• A.

More electrons than protons

• B.

Electrostatic force and electrons spinning

• C.

Less protons than electrons

• D.

Electrostatice force and protons spinning

Correct Answer
C. Less protons than electrons
Explanation
The correct answer is "less protons than electrons". This is because the attractive force between the positively charged protons in the nucleus and the negatively charged electrons in the orbit keeps the electron in orbit. The number of protons in the nucleus determines the positive charge, while the number of electrons determines the negative charge. If there are more electrons than protons, the negative charge would overpower the positive charge, causing repulsion rather than attraction. Therefore, it is the imbalance of protons and electrons that keeps the electron in orbit around the nucleus.

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• 17.

Electrical shock occurs when an individual touches                                                                      .

• A.

Electrical Equipment

• B.

Ground and Circuit

• C.

Electrical Components

• D.

Power Supplies

Correct Answer
B. Ground and Circuit
Explanation
Electrical shock occurs when an individual touches a live wire or an electrical conductor that is not properly grounded. The ground and circuit are essential in preventing electrical shock because they provide a path for the electric current to flow safely into the ground. Without a proper ground and circuit, the electric current can pass through a person's body, causing injury or even death. Therefore, understanding the importance of grounding and circuitry is crucial in preventing electrical accidents.

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• 18.

Convert .00004 to metric prefix.

• A.

40 Micro

• B.

40 Milli

• C.

4 Micro

• D.

4 Milli

Correct Answer
A. 40 Micro
Explanation
The correct answer is 40 Micro. The question asks to convert a given value, .00004, to a metric prefix. The metric prefix "micro" represents one millionth of a unit. Since the given value is already in decimal form, we can directly convert it to micro by moving the decimal point six places to the right. Therefore, .00004 is equal to 40 micro.

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• 19.

Convert 10000 to metric prefix

• A.

10 Kilo

• B.

10 Mega

• C.

100 Kilo

• D.

100 Mega

Correct Answer
A. 10 Kilo
Explanation
The correct answer is 10 Kilo because the metric prefix "kilo" represents a factor of 1000. Therefore, converting 10000 to kilo means dividing it by 1000, resulting in 10.

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• 20.

What causes the nucleus of an atom to be positively charged?

• A.

Neutrons

• B.

Electrons

• C.

Protons

• D.

Positrons

Correct Answer
C. Protons
Explanation
The nucleus of an atom is positively charged because it contains protons. Protons are subatomic particles that carry a positive charge. They are found in the nucleus along with neutrons, which are neutral particles. Electrons, on the other hand, are negatively charged and orbit around the nucleus. Positrons are positively charged particles, but they are not found in the nucleus of an atom. Therefore, the presence of protons in the nucleus is what causes it to be positively charged.

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• 21.

What causes an overload condition when you are measuring resistance?

• A.

Range switch set to high for resistance to be measured

• B.

Range switch set to low for resistance to be measured

• C.

Test leads connected to multimeter incorrectly

• D.

Incorrect function selected for value being measured

Correct Answer
B. Range switch set to low for resistance to be measured
Explanation
When the range switch is set to low for resistance measurement, it causes an overload condition. This is because the low range setting is used for measuring low resistance values, and if the resistance being measured is higher than the range setting, it will exceed the maximum limit of the meter and result in an overload.

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• 22.

Which of the following answers best describes a normally closed switch?

• A.

A switch that cannot be opened

• B.

A switch that once closed, remains closed until it is unlatched by voltage

• C.

A switch that remains open until manually closed

• D.

A switch that remains closed until manually opened

Correct Answer
D. A switch that remains closed until manually opened
Explanation
A normally closed switch is a type of switch that is in the closed position by default. It remains closed until it is manually opened, either by physically manipulating the switch or by applying voltage to unlatch it. This means that the circuit is complete and current can flow through the switch when it is in the closed position.

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• 23.

Which switch rotates on a shaft?

• A.

Slide

• B.

Toggle

• C.

Rotary

• D.

Push Button

Correct Answer
C. Rotary
Explanation
A rotary switch is the correct answer because it is the only type of switch that rotates on a shaft. A slide switch moves back and forth along a track, a toggle switch flips up and down, and a push button switch is pressed in. Only a rotary switch has the ability to rotate on a shaft, allowing for different positions or settings to be selected.

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• 24.

Define Permeability

Correct Answer
The ease with which a material can be magnetized
Explanation
Permeability refers to the ease with which a material can be magnetized. It is a measure of how easily magnetic lines of force can pass through a substance. Materials with high permeability can be easily magnetized, allowing a greater amount of magnetic flux to flow through them. On the other hand, materials with low permeability offer resistance to magnetization, resulting in a lower amount of magnetic flux passing through them. Therefore, the answer accurately defines permeability as the ease with which a material can be magnetized.

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• 25.

What material is affected most by flux lines?

• A.

Wood

• B.

Glass

• C.

Steel

• D.

Aluminum

Correct Answer
C. Steel
Explanation
Steel is affected most by flux lines because it is a ferromagnetic material. Flux lines are the lines of magnetic force that pass through a material. Ferromagnetic materials, such as steel, have a high susceptibility to magnetic fields and can easily become magnetized. This means that steel will be strongly affected by flux lines and can exhibit strong magnetic properties when exposed to a magnetic field.

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• 26.

What would be the expected output component for a radio receiver?

• A.

Volume control

• B.

Tuning knob

• C.

Speaker

• D.

Antenna

Correct Answer
A. Volume control
Explanation
The expected output component for a radio receiver would be the volume control. This component allows the user to adjust the volume level of the audio output from the radio. The tuning knob is used to select different radio stations, the speaker is responsible for producing the sound, and the antenna is used to receive the radio signals. However, the volume control is specifically related to controlling the volume level and is an essential component of a radio receiver.

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• 27.

What is not required for troubleshooting a circuit?

• A.

Voltages and signals

• B.

Schematic diagram

• C.

Test points

• D.

Test equipment

Correct Answer
C. Test points
Explanation
Test points are not required for troubleshooting a circuit. Test points are specific locations on a circuit board where test probes can be connected to measure voltages or signals. While test points can be helpful in diagnosing and troubleshooting circuit issues, they are not essential. Other tools and equipment such as a schematic diagram and test equipment like multimeters or oscilloscopes are typically more important for troubleshooting a circuit.

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• 28.

Which of the following IS NOT a typical indication of an overload condition?

• A.

"E" for error

• B.

"OL" for overload

• C.

Flashing LIghts

• D.

The display shows 0

Correct Answer
D. The display shows 0
Explanation
When an overload condition occurs, it usually causes the display to show a value other than zero. This is because an overload condition means that the current being measured is exceeding the maximum capacity of the device, resulting in a non-zero reading. Therefore, if the display shows 0, it indicates that there is no overload condition present, making it the correct answer as it is not a typical indication of an overload condition.

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• 29.

What causes an overload condition?

• A.

Range switch being set too low for current being measured

• B.

Range seitch being set to high for current being measured

• C.

Test leads connected to multimete incorrectly

• D.

Incorrect function selected for value being mesured

Correct Answer
A. Range switch being set too low for current being measured
Explanation
An overload condition occurs when the range switch on a multimeter is set too low for the current being measured. This means that the multimeter is not capable of handling the amount of current flowing through the circuit, causing it to become overloaded. This can lead to inaccurate readings or even damage to the multimeter. It is important to set the range switch appropriately to ensure accurate measurements and prevent overload conditions.

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• Current Version
• Mar 21, 2023
Quiz Edited by
ProProfs Editorial Team
• Dec 17, 2013
Quiz Created by
Teichmann

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