Ultimate Quiz On Basic Electronics Knowledge
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The study of electronics changes day by day as the technology concerned with transistors and microchips changes. One takes up electronics to understand how electrons move in a conductor, semiconductors, vacuum or gas. Take up the ultimate quiz on basic electronics knowledge and see how far wide your knowledge extends. All the best!
Questions and Answers
- 1.
Is it possible that 48V phantom power can damage a balanced, dynamic Mic?
- A.
Yes, it damages the voice coil
- B.
Yes, it burns out the output transformer
- C.
No, it just results in a low level hum noise, as phantom power has a frequency of 60 hz
- D.
No, as the same potential is applied to both leads of the voice coil
- E.
Yes, if the mic is plugged in while the power is on
Correct Answer
D. No, as the same potential is applied to both leads of the voice coilExplanation
The correct answer is no, as the same potential is applied to both leads of the voice coil. This means that the 48V phantom power is evenly distributed across both sides of the voice coil, preventing any damage to the mic.Rate this question:
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- 2.
In what type of circuit is the total resistance smaller than the smallest resistance?
- A.
Serial circuits of resistors
- B.
Parallel circuits of resistors
- C.
Parallel circuits of capacitors
- D.
Serial circuits of inductors
- E.
Parallel circuits of diodes
Correct Answer
B. Parallel circuits of resistorsExplanation
In a parallel circuit of resistors, the total resistance is smaller than the smallest resistance because the resistors are connected in parallel, providing multiple pathways for the current to flow. This allows for a larger total current to flow through the circuit, resulting in a smaller overall resistance.Rate this question:
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- 3.
What is the difference between potential and voltage?
- A.
No difference
- B.
The voltage is the product of the two potentials
- C.
The voltage is the sum of two potentials
- D.
The voltage is the difference of two potentials
Correct Answer
D. The voltage is the difference of two potentialsExplanation
The correct answer explains that the difference between potential and voltage is that voltage is the difference of two potentials. This means that voltage represents the separation or distance between two points with different electric potentials. It indicates the amount of energy required to move a unit of charge from one point to another. In contrast, potential refers to the electric potential at a specific point in an electric field, which represents the amount of electric potential energy per unit charge at that point. Therefore, the difference of potentials at two points gives us the voltage.Rate this question:
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- 4.
For which of the following wave forms is this statement true: VRMS = Vpeak
- A.
Sine
- B.
Square
- C.
Triangle
- D.
Ramp
- E.
Sawtooth
Correct Answer
B. SquareExplanation
The statement "VRMS = Vpeak" is true for a square wave. In a square wave, the peak value (Vpeak) is equal to the root mean square value (VRMS). This is because the square wave alternates between two constant voltage levels, resulting in equal peak and RMS values. In contrast, for a sine wave, triangle wave, ramp, or sawtooth wave, the peak value and RMS value are not equal.Rate this question:
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- 5.
What is the direction of the current flow (electron flow) in a closed DC circuit?
- A.
From the positive to the negative terminal
- B.
From the negative to the positive terminal
- C.
It depends on the components in the circuit
- D.
It alternates back and forth from negative to positive
- E.
None of the above
Correct Answer
B. From the negative to the positive terminalExplanation
In a closed DC circuit, the direction of current flow (electron flow) is from the negative to the positive terminal. This is because electrons, which carry the electric current, are negatively charged and are attracted to the positive terminal of the power source. Therefore, they flow from the negative terminal of the power source towards the positive terminal.Rate this question:
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- 6.
Charge in motion is called...
- A.
Retentivity
- B.
Conductance
- C.
Flux
- D.
Resistance
- E.
Current
Correct Answer
E. CurrentExplanation
Current is the flow of electric charge through a conductor. It is the rate at which charge passes through a given point in a circuit. Therefore, it is the appropriate term to describe charge in motion. Conductance refers to the ability of a material to conduct electric current, while resistance is the opposition to the flow of current. Flux is a term used in physics to describe the flow of a physical quantity through a surface. Retentivity, on the other hand, is the ability of a material to retain magnetization after the removal of an external magnetic field.Rate this question:
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- 7.
The unit of potential difference is the
- A.
Farad
- B.
Watt
- C.
Siemens
- D.
Volt
- E.
Ampere
Correct Answer
D. VoltExplanation
The potential difference is the amount of energy transferred per unit charge between two points in an electric circuit. The unit of potential difference is the volt (V). It represents the amount of electrical potential energy per unit charge. Therefore, the correct answer is volt.Rate this question:
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- 8.
Suppose you double the voltage in a simple DC circuit, and cut the resistance in half. The current will become
- A.
Half as great
- B.
Twice as great
- C.
The same as it was before
- D.
Eight times as great
- E.
Four times as great
Correct Answer
E. Four times as greatExplanation
When the voltage is doubled in a simple DC circuit, according to Ohm's Law (V = IR), the current will also double. Additionally, when the resistance is cut in half, the current will double again. Therefore, the current will become four times as great as it was before.Rate this question:
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- 9.
The DC voltage in a circuit is 550mV and the current is 7.2mA. What is the resistance?
- A.
0.76 ohms
- B.
76 ohms
- C.
0.0040 ohms
- D.
39.6 ohms
- E.
42 ohms
Correct Answer
B. 76 ohmsExplanation
The resistance can be calculated using Ohm's Law, which states that resistance (R) is equal to voltage (V) divided by current (I). In this case, the voltage is given as 550mV (or 0.55V) and the current is given as 7.2mA (or 0.0072A). By dividing the voltage by the current, we get 0.55V / 0.0072A = 76.3889 ohms. Rounding this to the nearest whole number gives us 76 ohms, which is the correct answer.Rate this question:
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- 10.
A material that has extremely high electrical resistance is known as
- A.
A semiconductor
- B.
A paraconductor
- C.
A resistor
- D.
An insulator
- E.
A diamagnetic substance
Correct Answer
D. An insulatorExplanation
An insulator is a material that has extremely high electrical resistance. This means that it does not conduct electricity easily and effectively blocks the flow of electric current. Insulators are commonly used in electrical and electronic systems to prevent the loss of electrical energy and to provide safety by minimizing the risk of electric shocks. Unlike conductors, such as metals, insulators have a large band gap between their valence and conduction bands, which makes it difficult for electrons to move freely through the material.Rate this question:
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- 11.
The length of time between a point in one cycle and the same point in the next cycle of an AC wave is the
- A.
Frequency
- B.
Magnitude
- C.
Amplitude
- D.
Period
- E.
Peak to peak value
Correct Answer
D. PeriodExplanation
The length of time between a point in one cycle and the same point in the next cycle of an AC wave is referred to as the period. It represents the time taken for the wave to complete one full cycle. The frequency, on the other hand, refers to the number of cycles that occur in one second. The magnitude and amplitude are terms used to describe the size or intensity of the wave. Peak to peak value represents the difference between the maximum and minimum values of the wave.Rate this question:
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- 12.
A capacitor stores electrical energy as
- A.
Current
- B.
Voltage
- C.
A magnetic field
- D.
An electric field
- E.
None of the above
Correct Answer
D. An electric fieldExplanation
A capacitor stores electrical energy as an electric field. When a voltage is applied across the capacitor, it creates an electric field between its plates. This electric field stores the energy in the form of potential energy. The capacitor can then release this stored energy when needed, by discharging the electric field. Therefore, the correct answer is an electric field.Rate this question:
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- 13.
A series circuit has 7 ohm, 9 ohm, and 10 ohm resistors; what is its total resistance?
- A.
26 ohms
- B.
6 ohms
- C.
23.9 ohms
- D.
22 ohms
- E.
5.3 ohms
Correct Answer
A. 26 ohmsExplanation
In a series circuit, the total resistance is the sum of the individual resistances. Therefore, the total resistance in this case would be 7 ohms + 9 ohms + 10 ohms = 26 ohms.Rate this question:
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- 14.
What is current in a circuit with a potential difference of 240V and a resistance of 75 ohms?
- A.
3.0 A
- B.
3.5 A
- C.
2.8 A
- D.
3.4A
- E.
3.2A
Correct Answer
E. 3.2AExplanation
The current in a circuit can be calculated using Ohm's Law, which states that current (I) is equal to the potential difference (V) divided by the resistance (R). In this case, the potential difference is 240V and the resistance is 75 ohms. Therefore, the current can be calculated as 240V / 75 ohms = 3.2A.Rate this question:
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- 15.
When electrical current flows in a DC circuit, it flows from
- A.
Positive to negative
- B.
The switch to the resistor
- C.
The inductor to the capacitor
- D.
Negative to positive
- E.
Left to right
Correct Answer
A. Positive to negativeExplanation
In a DC (Direct Current) circuit, electrical current flows from positive to negative. This means that the conventional direction of current flow is from the positive terminal of the voltage source (such as a battery) towards the negative terminal.Rate this question:
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- 16.
A parallel circuit consists of four 16 ohm resistors. What is the total resistance?
- A.
32 ohms
- B.
64 ohms
- C.
2 ohms
- D.
4 ohms
- E.
8 ohms
Correct Answer
D. 4 ohmsExplanation
In a parallel circuit, the total resistance is calculated by adding the reciprocals of the individual resistances and taking the reciprocal of the sum. In this case, the individual resistances are all 16 ohms. Therefore, the reciprocal of 16 ohms is 1/16. Adding the reciprocals of the four resistors gives 1/16 + 1/16 + 1/16 + 1/16 = 4/16. Taking the reciprocal of 4/16 gives a total resistance of 4 ohms.Rate this question:
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- 17.
A variable resistor that adjusts voltages in a circuit is
- A.
A capacitor
- B.
A flux capacitor
- C.
A potentiometer
- D.
An inductor
- E.
A transformer
Correct Answer
C. A potentiometerExplanation
A potentiometer is a variable resistor that can be used to adjust voltages in a circuit. It consists of a resistive element with a sliding contact that can be moved to vary the resistance. By changing the resistance, the potentiometer can control the amount of voltage passing through it, allowing for adjustments in the circuit. Unlike capacitors, flux capacitors, inductors, and transformers, which have different functions in a circuit, a potentiometer specifically serves the purpose of adjusting voltages.Rate this question:
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- 18.
What is the total resistance in a parallel DC circuit with resistors valued at 12 ohms, 6 ohms, and 4 ohms?
- A.
2 ohms
- B.
3 ohms
- C.
4 ohms
- D.
5 ohms
- E.
6 ohm
Correct Answer
A. 2 ohmsExplanation
In a parallel circuit, the total resistance is calculated by adding the reciprocals of the individual resistances and then taking the reciprocal of the sum. In this case, the reciprocals of the resistances are 1/12, 1/6, and 1/4. Adding these reciprocals gives 1/12 + 1/6 + 1/4 = 1/2. Taking the reciprocal of 1/2 gives 2 ohms, which is the total resistance in the parallel circuit.Rate this question:
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- 19.
How many amps does a 100 watt light bulb draw when connected to a 117V supply
- A.
.5 A
- B.
417 mA
- C.
110 V
- D.
1.2 A
- E.
855 mA
Correct Answer
E. 855 mAExplanation
The correct answer is 855 mA because to calculate the current, we can use Ohm's Law which states that current (I) is equal to power (P) divided by voltage (V). In this case, the power is given as 100 watts and the voltage is 117V. So, by dividing 100 watts by 117V, we get the current as approximately 0.855 A or 855 mA.Rate this question:
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- 20.
If a material has a low resistance,
- A.
It is a good conductor
- B.
It is a poor conductor
- C.
The current flows mainly in the form of holes
- D.
Current can only flow in one direction
- E.
It is a semiconductor
Correct Answer
A. It is a good conductorExplanation
A material with low resistance allows the flow of electric current easily. Good conductors have low resistance, meaning they have a high number of free electrons that can move freely through the material when a voltage is applied. These materials are efficient in conducting electricity and are commonly used in electrical wires and circuits.Rate this question:
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- 21.
A balanced line must have
- A.
One conductor and a shield
- B.
Two shields and two conductors
- C.
Two conductors and a shield
- D.
Two shields and a conductor
- E.
None of the above
Correct Answer
C. Two conductors and a shieldExplanation
A balanced line is a type of electrical transmission line that is used to carry signals with minimal interference or noise. It achieves this by having two conductors that carry equal and opposite currents, which helps to cancel out any external electromagnetic interference. The shield, on the other hand, is used to provide additional protection against interference by surrounding the conductors and preventing any external electromagnetic fields from affecting the signal. Therefore, a balanced line must have two conductors and a shield to ensure proper signal transmission with minimal interference.Rate this question:
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- 22.
The rate at which electrons (charge carriers) flow is measured in
- A.
Amperes
- B.
Coulombs
- C.
Volts
- D.
Watts
- E.
Watt hours
Correct Answer
A. AmperesExplanation
The rate at which electrons flow is measured in amperes. Amperes is the unit of electric current, which represents the amount of charge passing through a point in a circuit per unit time. It is named after the French mathematician and physicist André-Marie Ampère, who made significant contributions to the study of electromagnetism. Amperes provide a measure of the quantity of charge carriers (electrons) flowing in a circuit, indicating the strength of the current.Rate this question:
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- 23.
A component in an electrical circuit which can store energy but will not allow D/C current to flow is
- A.
A resistor
- B.
An impedance
- C.
A transformer
- D.
A capacitor
- E.
An inductor
Correct Answer
D. A capacitorExplanation
A capacitor is a component in an electrical circuit that can store energy. It consists of two conductive plates separated by a dielectric material. When a voltage is applied across the plates, it causes a charge to accumulate, thus storing energy. However, a capacitor does not allow direct current (D/C) to flow through it. This is because the dielectric material does not conduct electricity, preventing the flow of D/C current. Therefore, a capacitor can store energy but acts as an open circuit for D/C current.Rate this question:
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- 24.
In electrical circuits, what is a passive device?
- A.
A device that requires an external power source to operate
- B.
A device that does NOT require an external power source
- C.
A device that is lazy and really serves no purpose at all
- D.
A device that requires a capacitator
Correct Answer
B. A device that does NOT require an external power sourceExplanation
A passive device in electrical circuits refers to a device that does not require an external power source to operate. Unlike active devices, which require power to function, passive devices can perform their intended functions without the need for additional power input. These devices typically include resistors, capacitors, inductors, and transformers, which can manipulate electrical signals or energy without generating power themselves.Rate this question:
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- 25.
If Power equals Current times Voltage (P = l x V) then how do you find the Current if you know the Power and Voltage
- A.
Divide both sides by the power
- B.
Multiply both sides by the current
- C.
Multiply both sides by the voltage
- D.
Divide both sides by the voltage
- E.
You can't derive the Current from this formula
Correct Answer
D. Divide both sides by the voltageExplanation
To find the current if you know the power and voltage, you need to divide both sides of the equation P = l x V by the voltage. This will give you the equation l = P / V, which represents the current. By doing this, you isolate the current on one side of the equation and can easily calculate its value by dividing the power by the voltage.Rate this question:
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- 26.
The number of cycles per second of a waveform is called the
- A.
Frequency
- B.
Period
- C.
Voltage level
- D.
Current
Correct Answer
A. FrequencyExplanation
Frequency refers to the number of cycles per second of a waveform. It represents how many times a wave completes a full cycle in one second. It is commonly measured in Hertz (Hz). The higher the frequency, the more cycles occur in a given time period, indicating a faster oscillation. In the context of this question, frequency is the correct answer as it accurately defines the term being asked for.Rate this question:
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- 27.
What do we use to Interface a High impedance instrument (guitar) with a balanced Low impedance recording console?
- A.
Potentiometer
- B.
Isolation transformer snake
- C.
Direct box
- D.
Nothing, the impedance is not a problem
- E.
Hammer
Correct Answer
C. Direct boxExplanation
A direct box is used to interface a high impedance instrument, such as a guitar, with a balanced low impedance recording console. It converts the unbalanced high impedance signal from the instrument into a balanced low impedance signal that is compatible with the recording console. This helps to eliminate any impedance mismatch issues and ensures a clean and clear signal transfer without any loss of quality.Rate this question:
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- 28.
If you have a current draw of 2 amps driven by 50 volts what is the Power?
- A.
25 watts
- B.
100 watts
- C.
52 watts
- D.
200 watts
Correct Answer
B. 100 wattsExplanation
The power can be calculated using the formula P = IV, where P is power, I is current, and V is voltage. In this case, the current is 2 amps and the voltage is 50 volts. Therefore, the power is 2 amps multiplied by 50 volts, which equals 100 watts.Rate this question:
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- 29.
On analog audio equipment the available dynamics between the Standard Operating Level (Line Level) and the Maximum Output Level (clipping point) is known as:
- A.
Signal to noise ratio
- B.
Dynamic range
- C.
+4 dBu
- D.
Headroom
- E.
-10 dBV
Correct Answer
D. HeadroomExplanation
Headroom refers to the difference between the Standard Operating Level (Line Level) and the Maximum Output Level (clipping point) on analog audio equipment. It represents the amount of available space or "headroom" above the standard operating level before the audio signal starts to distort or clip. A larger headroom allows for a wider dynamic range and prevents the audio from being distorted or clipped, resulting in a cleaner and more accurate representation of the original sound.Rate this question:
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Feb 08, 2024Quiz Edited by
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Jul 10, 2009Quiz Created by
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