Electronics DC Circuits Fall Semester Exam
Complete the exam independantlty and quietly . Raise your hand when you are finished so I can record your grade in the book.
- 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.
Parellel
Correct Answer
C. Series-ParallelExplanation
A series-parallel circuit combines both series and parallel circuits. In this type of circuit, some components are connected in series, meaning the current flows through each component one after the other. At the same time, other components are connected in parallel, meaning the current splits and flows through multiple paths. This combination allows for a more complex circuit configuration that can be used in various applications.Rate this question:
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- 2.
The first step in calculating voltage drops in a series-parallel circuit is to determine _____.
- A.
The resistance of the parallel resistors
- B.
The resistance of the series resistors
- C.
Total current
- D.
Total voltage
Correct Answer
A. The resistance of the parallel resistorsExplanation
In order to calculate the voltage drops in a series-parallel circuit, it is necessary to determine the resistance of the parallel resistors. This is because in a series-parallel circuit, the total resistance is a combination of both series and parallel resistors. By determining the resistance of the parallel resistors, it becomes possible to calculate the current flowing through them and subsequently calculate the voltage drops across each resistor using Ohm's Law.Rate this question:
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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 voltageExplanation
Ohm's Law states that current is directly proportional to voltage. This means that as the voltage increases, the current flowing through a circuit also increases. Similarly, if the voltage decreases, the current will also decrease. The relationship between current and voltage can be expressed using the equation I = V/R, where I is the current, V is the voltage, and R is the resistance. This equation shows that when the voltage increases, the current will increase as long as the resistance remains constant.Rate this question:
- 4.
What is the unit of measure for power?
- A.
Amphere
- B.
Volt
- C.
Watt
- D.
Ohm
Correct Answer
C. WattExplanation
The unit of measure for power is watt. Power is the rate at which work is done or energy is transferred. The watt is defined as one joule per second, representing the amount of energy transferred or work done per unit time. It is commonly used to measure the power consumption of electrical devices and the output of electrical systems.Rate this question:
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- 5.
What symbol represents power?
- A.
P
- B.
V
- C.
I
- D.
R
Correct Answer
A. PExplanation
The symbol "P" represents power. This is commonly used in physics and electrical engineering to denote the rate at which work is done or energy is transferred. It is derived from the equation P = W/t, where P is power, W is work, and t is time. The symbol "P" is universally recognized and used to represent power in various contexts and equations.Rate this question:
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- 6.
What happens to current when voltage increases?
- A.
Decreases
- B.
Increases
- C.
Remains the same
Correct Answer
B. IncreasesExplanation
When voltage increases, the current flowing through a circuit also increases. This is because according to Ohm's Law, the current is directly proportional to the voltage. As the voltage increases, the electric potential difference across the circuit increases, which in turn allows more electrons to flow through the circuit, resulting in an increase in current.Rate this question:
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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 pointsExplanation
In a series circuit, the current is the same at all points because there is only one path for the current to flow. The current that flows through each component in the circuit is equal to the total current flowing through the circuit. Therefore, the current remains constant throughout the circuit.Rate this question:
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- 8.
What effect on total current flow will a shorted series component have in a series-parallel 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 increaseExplanation
In a series-parallel circuit, a shorted series component creates a path of low resistance, bypassing the rest of the circuit. As a result, more current will flow through the shorted component, causing the total current in the circuit to increase.Rate this question:
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- 9.
What is the fourth step of the troubelshooting procedure?
- A.
Check the setup
- B.
Check the results
- C.
Analyze the circuit
- D.
Calculate and measure values
Correct Answer
B. Check the resultsExplanation
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 expected results are obtained. This step helps in identifying any discrepancies or errors in the circuit or the troubleshooting process. By checking the results, one can determine if the issue has been resolved or if further steps need to be taken to troubleshoot the problem effectively.Rate this question:
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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 openExplanation
An open circuit refers to a break or discontinuity in the electrical path, which prevents the flow of current. In this case, if there is an open in the component, it would cause the applied voltage to drop because the circuit is interrupted and the voltage cannot reach the component. Therefore, an open is the most likely cause for the component to drop the applied voltage.Rate this question:
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- 11.
Electrical shock occures when an individual touches
- A.
Electrical equipment
- B.
Ground and circuit
- C.
Elecrtrical components
- D.
Power supplies
Correct Answer
B. Ground and circuitExplanation
Electrical shock occurs when an individual touches the ground and circuit. When a person comes into contact with both the ground and a live electrical circuit, the body provides a path for the electric current to flow through. This can result in an electrical shock, which can be extremely dangerous and potentially fatal. It is important to always exercise caution and follow safety procedures when working with electrical equipment to prevent such incidents.Rate this question:
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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 sourceExplanation
In the event of an 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 victim's safety and prevent further harm. By calling for medical help, professional assistance can be provided to treat the victim's injuries. Removing the victim from the electrical source is crucial to prevent ongoing electrical contact and potential further injury.Rate this question:
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- 13.
Burns caused by electrical current flowing through the body tissure and bones are called
- A.
Arc Burns
- B.
Thermal Contact burns
- C.
Electrical Burns
- D.
Shock Burns
Correct Answer
C. Electrical BurnsExplanation
Electrical burns are caused by the flow of electrical current through the 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 damage to the skin, muscles, and internal organs, leading to burns. These burns are specifically referred to as electrical burns due to their unique cause and mechanism of injury.Rate this question:
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- 14.
Subtract (4M) - (2M)
- A.
2M
- B.
4M
- C.
6M
- D.
8M
Correct Answer
A. 2MExplanation
The given question asks to subtract (4M) - (2M). When subtracting two quantities with the same unit, we subtract the numerical values and keep the unit the same. In this case, subtracting 2M from 4M gives us 2M. Therefore, the answer is 2M.Rate this question:
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- 15.
An electrostatic discharge passing through an ESD could cause catastophic failure, major electrical characteristic changes, or performance degradation in the device.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
An electrostatic discharge (ESD) refers to the sudden flow of electricity between two objects with different electrical potentials. When an ESD passes through an electronic device, it can have detrimental effects. These effects can range from catastrophic failure, where the device becomes completely non-functional, to major electrical characteristic changes, which can affect the device's performance and reliability. Additionally, an ESD can also cause performance degradation in the device, leading to reduced efficiency or functionality. Therefore, the statement that an electrostatic discharge passing through an ESD could cause catastrophic failure, major electrical characteristic changes, or performance degradation in the device is true.Rate this question:
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- 16.
What keeps an electron in orbit around the nucleaus?
- A.
More electrons than protons
- B.
Electrostatic force and electrons spinning
- C.
Less protons than electrons
- D.
Electrostatic force and protons spinning
Correct Answer
C. Less protons than electronsExplanation
The correct answer is "less protons than electrons". This is because electrons are negatively charged particles and protons are positively charged particles. Opposite charges attract each other, so the negatively charged electrons are attracted to the positively charged protons in the nucleus. The balance between the attractive force of the protons and the centrifugal force of the electron's motion keeps the electron in orbit around the nucleus. If there were more protons than electrons, the electrostatic force would be stronger and the electron would be pulled closer to the nucleus.Rate this question:
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- 17.
Convert .00004 to metric prefix
- A.
40 Micro
- B.
40 milli
- C.
4 micro
- D.
4 milli
Correct Answer
A. 40 MicroExplanation
The correct answer is 40 Micro. This is because the given number, .00004, is a very small value. To convert it to a metric prefix, we need to determine the appropriate prefix that represents a value that is 10^-6 times the original value. The metric prefix "Micro" represents 10^-6, so the correct answer is 40 Micro.Rate this question:
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- 18.
Convert 10000 to metric prefix
- A.
10 kilo
- B.
10 mega
- C.
100 kilo
- D.
100 mega
Correct Answer
A. 10 kiloExplanation
The correct answer is 10 kilo. This is because the metric prefix "kilo" represents a multiplication factor of 1000. Therefore, converting 10000 to kilo means dividing it by 1000, resulting in 10 kilo.Rate this question:
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- 19.
What causes an overlaod condidtion when you are measuring resistance?
- A.
Range switch set too high for resistance to be measured
- B.
Range seitch set too low for resistance to be measured
- C.
Test leads connectred to multimeter incorrectly
- D.
Incorrect function selected for value being measured
Correct Answer
B. Range seitch set too low for resistance to be measuredExplanation
When the range switch is set too low for resistance to be measured, it means that the multimeter is not able to handle the resistance value being measured. This can lead to an overload condition because the multimeter is not able to accurately measure the resistance within its specified range. The multimeter may display an error message or provide inaccurate readings when the range switch is set too low. To avoid this, it is important to select the appropriate range on the multimeter based on the resistance being measured.Rate this question:
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- 20.
How does resistance affect current?
- A.
Less resistance=less current
- B.
More resistance=less current
- C.
More resistance=more current
- D.
Resistance does not affect current
Correct Answer
B. More resistance=less currentExplanation
As per Ohm's Law, the current flowing through a conductor is inversely proportional to the resistance. This means that as the resistance increases, the current decreases. Therefore, the statement "More resistance=less current" is correct. When there is more resistance in a circuit, it becomes harder for the electrons to flow, resulting in a decrease in the current.Rate this question:
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- 21.
Which of the following answers best describe 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 openedExplanation
A normally closed switch is a type of switch that is in the closed position by default and remains closed until it is manually opened. This means that the circuit is complete and current can flow through the switch when it is in the closed position. It requires external action to open the switch and break the circuit.Rate this question:
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- 22.
Which switch rotates on a shaft
- A.
Slide
- B.
Toggle
- C.
Rotary
- D.
Push Button
Correct Answer
C. RotaryExplanation
A rotary switch is the correct answer because it is a type of switch that rotates on a shaft. Unlike a slide switch, which moves in a linear motion, a rotary switch can be turned in a circular motion around its axis. This rotation allows the switch to cycle through different positions or settings, making it suitable for applications where multiple options need to be selected or adjusted.Rate this question:
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- 23.
The screwdriver is used for
- A.
Removing cabiunet cover fasteners
- B.
Prying open paint cans
- C.
Driving Nails
- D.
Dressing Cable
Correct Answer
A. Removing cabiunet cover fastenersExplanation
The screwdriver is used for removing cabinet cover fasteners. It is a tool specifically designed to tighten or loosen screws, making it ideal for removing fasteners that hold cabinet covers in place. It provides the necessary leverage and grip to effectively unscrew the fasteners without causing damage to the cabinet or cover.Rate this question:
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- 24.
The Phillip's Screw was invented
- A.
To sell more tools
- B.
During the 15th century
- C.
By Henry Ford
- D.
In the 1930's
Correct Answer
D. In the 1930's -
- 25.
What would be the expected outcome component for a radio reciever?
- A.
Volume Control
- B.
Tuning Knob
- C.
Speaker
- D.
Antenna
Correct Answer
D. AntennaExplanation
The expected outcome component for a radio receiver would be the antenna. The antenna is responsible for receiving radio signals and converting them into electrical signals that can be processed by the receiver. Without an antenna, the receiver would not be able to pick up any radio signals and therefore would not be able to function properly. The volume control, tuning knob, and speaker are all important components of a radio receiver, but they are not directly responsible for the reception of radio signals.Rate this question:
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- 26.
What is not required for troubleshooting a circuit?
- A.
Voltage and signals
- B.
Schematic diagram
- C.
Test Points
- D.
Test equipment
Correct Answer
C. Test PointsExplanation
Test points are not required for troubleshooting a circuit. Test points are specific locations on a circuit board where test equipment can be connected to measure voltage, current, or other electrical properties. While test points can be helpful in diagnosing and troubleshooting circuit issues, they are not essential. Troubleshooting can still be done using other methods such as analyzing the schematic diagram, checking for voltage and signals, and using appropriate test equipment.Rate this question:
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- 27.
What material is affected most by flux lines?
- A.
Wood
- B.
Glass
- C.
Steel
- D.
Aluminum
Correct Answer
C. SteelExplanation
Steel is the material that is affected most by flux lines. Flux lines are lines of magnetic force that are produced when a magnetic field passes through a material. Steel is a ferromagnetic material, which means it can easily be magnetized and demagnetized. When flux lines pass through steel, they cause the material to become magnetized. This property of steel makes it highly susceptible to the effects of flux lines compared to other materials like wood, glass, and aluminum, which are not ferromagnetic.Rate this question:
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- 28.
Permiability is
- A.
Residual Magnetism
- B.
The opposition to a magnetizing force
- C.
The ease with which a material can be magnetized
- D.
The ability of a material to retain its magnetism
Correct Answer
C. The ease with which a material can be magnetizedExplanation
Permeability refers to the ease with which a material can be magnetized. It is a measure of how easily a material can establish a magnetic field within itself when subjected to a magnetic force. High permeability implies that a material can be easily magnetized, while low permeability means that it is difficult to magnetize the material. Therefore, the correct answer is "The ease with which a material can be magnetized."Rate this question:
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- 29.
Whcih of the following is NOT a typoical indication of an overload condition?
- A.
"E" for error
- B.
"O.L." for overload
- C.
Flashing lights
- D.
The display shows "0"
Correct Answer
D. The display shows "0"Explanation
When an overload condition occurs, it typically means that the system or device is operating beyond its capacity. In such cases, the display would usually show a value other than zero, indicating the overload. However, if the display shows "0", it suggests that there is no load or activity on the system, which is not a typical indication of an overload condition.Rate this question:
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- 30.
What causes and overload condiditon?
- A.
Range switch being st too low for current being measured
- B.
Range switch being set too high for current being measured
- C.
Test leads connected to multimeter incorrectly
- D.
Incorrect function selected for calue being measured
Correct Answer
A. Range switch being st too low for current being measuredExplanation
An overload condition occurs when the range switch is set too low for the current being measured. This means that the current flowing through the circuit is higher than what the range switch can handle, causing the multimeter to become overloaded. This can lead to inaccurate readings or damage to the multimeter. It is important to set the range switch appropriately to ensure accurate measurements and prevent overload conditions.Rate this question:
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Mar 21, 2023Quiz Edited by
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Dec 13, 2010Quiz Created by
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