2A652 CDC Volume 2 Pretest
Questions and Answers
- 1.
How many valence electrons are needed to make a good conductor?
- A.
3
- B.
4
- C.
5
- D.
6
Correct Answer
A. 3Explanation
A good conductor requires a small number of valence electrons to be able to easily move and carry electric charge. Valence electrons are the outermost electrons in an atom's electron shell, and they are responsible for the atom's chemical properties. Since only a few valence electrons are needed for a good conductor, the correct answer is 3.Rate this question:
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- 2.
An atom with eight electrons in its outermost shell is said to be
- A.
Free
- B.
Stable
- C.
Valence
- D.
Ionized
Correct Answer
B. StableExplanation
An atom with eight electrons in its outermost shell is said to be stable. This is because the octet rule states that atoms tend to gain, lose, or share electrons in order to achieve a full outer shell of eight electrons. When an atom has a full outer shell, it is considered stable and less likely to react with other atoms.Rate this question:
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- 3.
"Dielectric" is the term used for
- A.
Conductors
- B.
Insulators
- C.
Doped atoms
- D.
Semi-conductors
Correct Answer
B. InsulatorsExplanation
The term "dielectric" is used to refer to insulators. Insulators are materials that do not conduct electricity easily and have high resistivity. They are commonly used to prevent the flow of electric current and to insulate electrical components. Dielectric materials are often used in capacitors, where they store electrical energy by creating an electric field between two conductive plates.Rate this question:
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- 4.
"The flow or drift of electrons through a conductor" in the same direction at the same time is the definition of
- A.
Conductivity
- B.
Voltage
- C.
Current
- D.
Valence
Correct Answer
C. CurrentExplanation
Current is defined as the flow or drift of electrons through a conductor in the same direction at the same time. It is a measure of the rate at which electric charge flows in a circuit. Conductivity refers to the ability of a material to conduct electricity, while voltage is the difference in electric potential between two points. Valence, on the other hand, refers to the combining capacity of an element in a chemical reaction. Therefore, the correct answer is current, as it accurately describes the given definition.Rate this question:
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- 5.
The potential difference between two points in a circuit that exerts a force on free electrons is called
- A.
Conductivity
- B.
Voltage
- C.
Current
- D.
Valence
Correct Answer
B. VoltageExplanation
Voltage is the correct answer because it refers to the potential difference between two points in a circuit. This potential difference creates an electric field that exerts a force on free electrons, causing them to move and creating an electric current. Conductivity refers to the ability of a material to conduct electric current, while current is the flow of electric charge. Valence, on the other hand, refers to the outermost shell of electrons in an atom.Rate this question:
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- 6.
What is used to control current flow in a circuit?
- A.
Voltage
- B.
Coulombs
- C.
Resistance
- D.
Conductivity
Correct Answer
C. ResistanceExplanation
Resistance is used to control current flow in a circuit. Resistance is a property of a material that opposes the flow of electric current. It is measured in ohms and determines how much current will flow through a circuit for a given voltage. A higher resistance will result in less current flow, while a lower resistance will allow more current to flow. By adjusting the resistance in a circuit, the amount of current can be controlled.Rate this question:
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- 7.
Given a voltage of 24 volts and a resistance of 18 ohms in a series circuit, the current through the resistor would be
- A.
.075 amps
- B.
1.33 amps
- C.
133 amps
- D.
750 amps
Correct Answer
B. 1.33 ampsExplanation
In a series circuit, the current flowing through the circuit is the same at all points. According to Ohm's Law, the current (I) can be calculated by dividing the voltage (V) by the resistance (R), using the formula I = V/R. Therefore, in this case, the current through the resistor can be calculated as 24 volts divided by 18 ohms, which equals 1.33 amps.Rate this question:
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- 8.
Total current in a series circuit is equal to the
- A.
Current through one component
- B.
Sum of the current through each component
- C.
Reciprocal of the current through one component
- D.
Reciprocal of the sum of the currents through each component
Correct Answer
A. Current through one componentExplanation
In a series circuit, the current is the same at every point in the circuit. This means that the current through one component is equal to the current through any other component in the circuit. Therefore, the total current in a series circuit is equal to the current through one component.Rate this question:
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- 9.
In a parallel circuit, the total voltage is equal to the
- A.
Sum of the voltages across each branch
- B.
Voltage across each resistor
- C.
Voltage across each branch
- D.
The reciprocal of the voltage across the resistances
Correct Answer
C. Voltage across each branchExplanation
In a parallel circuit, the total voltage is equal to the sum of the voltages across each branch. This means that each branch in the circuit will have the same voltage across it. This is because in a parallel circuit, the voltage across each branch is the same as the voltage across the power source.Rate this question:
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- 10.
Source current in a parallel circuit will be divided according to branch
- A.
Voltage
- B.
Powers
- C.
Lengths
- D.
Resistances
Correct Answer
D. ResistancesExplanation
In a parallel circuit, the source current is divided among the different branches based on their resistances. Each branch offers a different level of resistance, and the current flowing through each branch is inversely proportional to its resistance. Therefore, the branch with a higher resistance will have a lower current, while the branch with a lower resistance will have a higher current. This division of current based on resistances allows for independent functioning of the different branches in a parallel circuit.Rate this question:
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- 11.
What is the total resistance of a parallel circuit with branch voltages of 440 volt (v) and 440v and branch currents of 4 amp (a) and 16a?
- A.
11 ohms
- B.
22 ohms
- C.
44 ohms
- D.
68.75 ohms
Correct Answer
B. 22 ohmsExplanation
In a parallel circuit, the total resistance is calculated using the formula 1/Rt = 1/R1 + 1/R2 + 1/R3 + ... In this case, we have two branches with voltages of 440V and currents of 4A and 16A respectively. To find the resistance of each branch, we can use Ohm's Law: R = V/I. Therefore, the resistance of the first branch is 440V / 4A = 110 ohms, and the resistance of the second branch is 440V / 16A = 27.5 ohms. Plugging these values into the formula for total resistance, we get 1/Rt = 1/110 + 1/27.5 = 0.0091 + 0.0364 = 0.0455. Taking the reciprocal of this value gives us Rt = 22 ohms.Rate this question:
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- 12.
Total current in a series-parallel circuit remains the same throughout the
- A.
Parallel portion of the circuit and divides according to component resistance in the series portion
- B.
Series part of the circuit and divides according to branch resistance in the parallel portion
- C.
Parallel portion of the circuit and increases according to component resistance in the series portion
- D.
Series part of the circuit and increases according to component resistance in the parallel portion
Correct Answer
B. Series part of the circuit and divides according to branch resistance in the parallel portionExplanation
In a series-parallel circuit, the total current remains constant throughout the parallel portion of the circuit. This means that the current flowing through each branch in the parallel portion is the same. However, in the series portion of the circuit, the total current divides according to the resistance of each component. This means that the current flowing through each component in the series portion will be different, with more current flowing through components with lower resistance and less current flowing through components with higher resistance. Therefore, the correct answer is that the total current in a series-parallel circuit remains the same throughout the series part of the circuit and divides according to the branch resistance in the parallel portion.Rate this question:
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- 13.
What is the total current in a series-parallel circuit that has a total voltage or 48 volts (v), a series current of 6 amps (a), one branch current of 2a, and the other branch resistance of 3 ohms?
- A.
3a
- B.
6a
- C.
8a
- D.
12a
Correct Answer
B. 6aExplanation
In a series-parallel circuit, the total current is the same throughout the circuit. Given that the series current is 6 amps, it means that the total current in the circuit is also 6 amps. Therefore, the correct answer is 6a.Rate this question:
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- 14.
The area around a magnet where its influence can be felt is the definition of the
- A.
Saturation principle
- B.
Magnetic theory
- C.
Magnetic field
- D.
Law of attraction and repulsion
Correct Answer
C. Magnetic fieldExplanation
The area around a magnet where its influence can be felt is known as the magnetic field. A magnetic field is a region in which a magnetic force is exerted on magnetic materials or moving electric charges. It is created by the movement of electric charges, such as the flow of current in a wire or the spinning of electrons in an atom. The strength and direction of the magnetic field can be visualized using magnetic field lines.Rate this question:
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- 15.
The magnetism that remains after the magnetizing force has been removed is known as
- A.
Electromagnetism
- B.
Molecular magnetism
- C.
Permeability
- D.
Residual magnetism
Correct Answer
D. Residual magnetismExplanation
Residual magnetism refers to the magnetism that remains in a material even after the magnetizing force has been removed. It is the property of certain materials to retain a magnetic field, which can be useful in various applications such as in the creation of permanent magnets. This phenomenon occurs due to the alignment of magnetic domains within the material, resulting in a net magnetic field that persists even without an external magnetic field.Rate this question:
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- 16.
The magnetic field of an electromagnet can be varied by changing the
- A.
Type of core
- B.
Number of turns in the coil
- C.
Ammount of current through the coil
- D.
All of the above
Correct Answer
D. All of the aboveExplanation
The magnetic field of an electromagnet can be varied by changing the type of core, number of turns in the coil, and the amount of current through the coil. The type of core affects the strength of the magnetic field as different materials have different magnetic properties. Increasing the number of turns in the coil increases the strength of the magnetic field as it increases the overall magnetic flux. Finally, increasing the amount of current through the coil increases the strength of the magnetic field as it increases the flow of electric charges and consequently the magnetic field. Therefore, all of the above factors can individually or collectively affect the magnetic field of an electromagnet.Rate this question:
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- 17.
The electromechanical generation of a voltage requires a magnetic field, relative motion, and
- A.
A complete circuit
- B.
A conductor
- C.
An insulator
- D.
A load
Correct Answer
B. A conductorExplanation
In order to generate a voltage electromechanically, a magnetic field and relative motion are necessary. However, without a conductor, the flow of electrons required to create an electric current would not be possible. A conductor allows the movement of charged particles, such as electrons, which is essential for the generation of a voltage. Therefore, a conductor is required for electromechanical voltage generation.Rate this question:
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- 18.
In a simple generator, which would be the most difficult method to increase the output?
- A.
Increase the area of the conductor
- B.
Increase the ammount of motion
- C.
Increase the strength of the magnetic field
- D.
Increase the rlative resistance
Correct Answer
B. Increase the ammount of motionExplanation
Increasing the amount of motion would be the most difficult method to increase the output in a simple generator. This is because increasing the motion requires additional mechanical energy input, which can be challenging to achieve. On the other hand, increasing the area of the conductor, the strength of the magnetic field, or the relative resistance can be relatively easier to accomplish and would result in a more significant increase in the generator's output.Rate this question:
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- 19.
The principle behind all electromechanical generation is
- A.
Conduction
- B.
Commutation
- C.
Rectification
- D.
Electromagnetic induction
Correct Answer
D. Electromagnetic inductionExplanation
Electromagnetic induction is the principle behind all electromechanical generation. It is the process of generating an electric current in a conductor by moving it through a magnetic field or by varying the magnetic field around it. This phenomenon is used in various devices such as generators, transformers, and electric motors to convert mechanical energy into electrical energy or vice versa. Electromagnetic induction is based on Faraday's law of electromagnetic induction, which states that a change in magnetic field induces an electromotive force (EMF) in a conductor.Rate this question:
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- 20.
An inductor stores energy in the form of
- A.
Heat
- B.
Resistance
- C.
A magnetic field
- D.
An electrostatic field
Correct Answer
C. A magnetic fieldExplanation
An inductor stores energy in the form of a magnetic field. When current flows through an inductor, it creates a magnetic field around it. This magnetic field stores the energy and opposes any change in current. When the current is turned off, the magnetic field collapses and releases the stored energy. This property of inductors makes them useful in various applications such as in power supplies, transformers, and electric motors.Rate this question:
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- 21.
The process by which a current change in one coil produces a voltage in another coil is called
- A.
Inductance
- B.
Self-induction
- C.
Mutual induction
- D.
None of the above
Correct Answer
C. Mutual inductionExplanation
Mutual induction is the process by which a current change in one coil induces a voltage in another coil. This phenomenon occurs when the magnetic field produced by one coil cuts across the turns of another coil, generating an electromotive force (EMF) in the second coil. This is the basis for the functioning of transformers and is widely used in various electrical devices and systems. Inductance refers to the property of a coil to oppose changes in current, while self-induction specifically refers to the production of a voltage in the same coil due to its own changing current.Rate this question:
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- 22.
A transformer will change all of the following except
- A.
Power
- B.
Current
- C.
Voltage
- D.
Resistance
Correct Answer
A. PowerExplanation
A transformer is an electrical device that can change the voltage of an alternating current (AC) while keeping the power constant. Power is the product of voltage and current, so if the voltage is changed by the transformer, the current will change accordingly to maintain the same power. Therefore, the correct answer is power because a transformer does not change the power, it only changes the voltage and current.Rate this question:
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- 23.
Normally, the winding of a transformer that is connected to a power source is known as the
- A.
Field winding
- B.
Primary winding
- C.
Current winding
- D.
Secondary winding
Correct Answer
B. Primary windingExplanation
The winding of a transformer that is connected to a power source is known as the primary winding. This is because the primary winding is responsible for receiving the electrical energy from the power source and transferring it to the secondary winding. The primary winding typically has a higher number of turns compared to the secondary winding, allowing it to step up or step down the voltage as required by the transformer.Rate this question:
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- 24.
A relay is an electrically operated
- A.
Meter
- B.
Motor
- C.
Switch
- D.
Safety device
Correct Answer
C. SwitchExplanation
A relay is an electrically operated switch. It is a device that controls the opening and closing of an electrical circuit by using an electromagnet to move a set of contacts. When the coil of the relay is energized, it creates a magnetic field that attracts the contacts, allowing current to flow through the circuit. When the coil is de-energized, the contacts return to their original position, interrupting the flow of current. Therefore, a relay acts as a switch, controlling the flow of electricity in a circuit.Rate this question:
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- 25.
A relay that, once energized, requires a second coil to be energized before the contacts will return to their original positions is called a
- A.
Locking relay
- B.
Latching relay
- C.
Timing relay
- D.
Tripping relay
Correct Answer
B. Latching relayExplanation
A latching relay is a type of relay that, once energized, will maintain its state even after the initial input signal is removed. It requires a second coil to be energized in order to change its state and return the contacts to their original positions. This feature allows the latching relay to "lock" in its current state until a specific signal is received to change it.Rate this question:
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- 26.
A capacitor stores energy in the form of
- A.
Heat
- B.
Resistance
- C.
A magnetic field
- D.
An electrostatic field
Correct Answer
D. An electrostatic fieldExplanation
A capacitor stores energy in the form of an electrostatic field. When a voltage is applied across a capacitor, it causes a separation of charges, with positive charges accumulating on one plate and negative charges on the other plate. This separation of charges creates an electric field between the plates, which stores the energy. The energy is released when the capacitor is discharged, and the charges flow back to their original positions, converting the stored energy back into electrical energy.Rate this question:
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- 27.
In a capacitor, the dielectric is the
- A.
Positive lead
- B.
Conductor
- C.
Insulator
- D.
Outer case
Correct Answer
C. InsulatorExplanation
In a capacitor, the dielectric is the insulator. The dielectric is a material that is placed between the two plates of the capacitor and it acts as an insulator, preventing the flow of electric current between the plates. It helps to increase the capacitance of the capacitor by storing more charge. The dielectric material can be made of various substances such as glass, ceramic, plastic, or even air.Rate this question:
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- 28.
Opposition of a capacitor to alternating current (AC) is called
- A.
Inductive reactance
- B.
Impedance
- C.
Capacitive reactance
- D.
Capacitance
Correct Answer
C. Capacitive reactanceExplanation
Capacitive reactance is the opposition that a capacitor exhibits to the flow of alternating current (AC). It is caused by the capacitor's ability to store and release electrical energy. When AC voltage is applied, the capacitor charges and discharges, creating a phase shift between the current and voltage. This opposition is measured in ohms and increases with frequency. Capacitive reactance is the correct answer because it specifically refers to the opposition of a capacitor to AC. Impedance, on the other hand, is a broader term that encompasses the total opposition to current flow in a circuit, including resistance and reactance.Rate this question:
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- 29.
The factors which determine the time required to charge a capacitor are the capacitance and the
- A.
Applied voltage
- B.
Circuit current
- C.
Amount of resistance
- D.
Type of dielectric
Correct Answer
C. Amount of resistanceExplanation
The amount of resistance is a factor that determines the time required to charge a capacitor. Resistance limits the flow of current in the circuit, affecting the rate at which the capacitor charges. Higher resistance slows down the charging process, while lower resistance allows for faster charging. Therefore, the amount of resistance in the circuit directly influences the time it takes for the capacitor to charge.Rate this question:
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- 30.
Expanding or contracting the depletion region of a diode is called
- A.
Basing
- B.
Gating
- C.
Spiking
- D.
Biasing
Correct Answer
D. BiasingExplanation
Biasing refers to the process of applying a DC voltage to a diode or transistor in order to establish a specific operating point. By applying a bias voltage, the depletion region of the diode can be either expanded or contracted, allowing or blocking the flow of current through the diode. Therefore, biasing is the correct term to describe the process of expanding or contracting the depletion region of a diode.Rate this question:
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- 31.
A diode placed in a circuit in reverse bias is being used as
- A.
A spike protector
- B.
An amplifier
- C.
A regulator
- D.
A rectifier
Correct Answer
A. A spike protectorExplanation
When a diode is placed in reverse bias, it acts as a spike protector. In this configuration, the diode allows current to flow only in the reverse direction, blocking any spikes or surges in voltage that may occur in the circuit. This helps to protect the other components in the circuit from damage caused by these voltage spikes. Therefore, the diode is being used as a spike protector in this scenario.Rate this question:
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- 32.
A zener will conduct in reverse bias
- A.
For a second or two at a time
- B.
Until gate potential has been reached
- C.
Once the avalanche point has been reached
- D.
Until the breakdown point has been reached
Correct Answer
C. Once the avalanche point has been reachedExplanation
Once the avalanche point has been reached, a zener diode will start conducting in reverse bias. The avalanche breakdown occurs when the voltage across the diode exceeds its breakdown voltage, causing a rapid increase in the reverse current. This breakdown allows the zener diode to regulate the voltage across it by maintaining a constant voltage drop. Therefore, once the avalanche point is reached, the zener diode will conduct in reverse bias.Rate this question:
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- 33.
A zener being used as a regulator must have a resistor placed in the circuit in
- A.
Series
- B.
Parallel
- C.
Reverse bias
- D.
Series parallel
Correct Answer
A. SeriesExplanation
When a zener diode is used as a voltage regulator, it is necessary to place a resistor in series with it. This resistor helps to limit the current flowing through the zener diode and prevent it from being damaged. By placing the resistor in series, the current passing through both components is the same. This ensures that the zener diode operates within its specified voltage range and regulates the voltage effectively. Therefore, the correct answer is series.Rate this question:
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- 34.
A light emitting diode (LED) produces light when it is
- A.
Gated
- B.
Neutral
- C.
Forward biased
- D.
Reverse biased
Correct Answer
C. Forward biasedExplanation
When a light emitting diode (LED) is forward biased, it means that the positive terminal of the power supply is connected to the anode and the negative terminal is connected to the cathode of the LED. This causes the LED to conduct current and emit light. In this configuration, the energy levels of the LED's electrons are raised, allowing them to move across the junction and recombine with electron holes, releasing photons in the process. Therefore, forward biasing is the correct condition for an LED to produce light.Rate this question:
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- 35.
What is the approximate operating voltage of a light emitting diode (LED)?
- A.
.5 volts
- B.
.1 volts
- C.
1.6 volts
- D.
2.4 volts
Correct Answer
C. 1.6 voltsExplanation
The approximate operating voltage of a light emitting diode (LED) is 1.6 volts.Rate this question:
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- 36.
The silicon controlled rectifier (SCR) has how many PN Junctions?
- A.
One
- B.
Two
- C.
Three
- D.
Four
Correct Answer
C. ThreeExplanation
An SCR (Silicon Controlled Rectifier) has three PN junctions. A PN junction is formed when a P-type semiconductor material is joined with an N-type semiconductor material. In an SCR, there are two PN junctions between the P and N layers, and an additional PN junction between the gate and cathode. These junctions allow the SCR to control the flow of current in a circuit, making it a three-junction device.Rate this question:
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- 37.
A silicon controlled rectifier (SCR) is mainly used as
- A.
A fuse
- B.
Spike protector
- C.
A circuit breaker
- D.
An electronic switch
Correct Answer
D. An electronic switchExplanation
An SCR is primarily used as an electronic switch because it can control the flow of electric current in a circuit. It can be turned on and off by a small control signal, allowing it to regulate the flow of power to various devices. This makes it useful in applications where precise control of electrical current is required, such as in motor control, lighting systems, and power supplies. Unlike a fuse, spike protector, or circuit breaker, an SCR does not provide protection against overcurrent or voltage spikes.Rate this question:
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- 38.
The control junction of a transistor is the
- A.
Emitter-base junction
- B.
Emitter-source junction
- C.
Base-collector junction
- D.
Emitter-collector junction
Correct Answer
A. Emitter-base junctionExplanation
The control junction of a transistor is the emitter-base junction. This junction plays a crucial role in controlling the flow of current in the transistor. By applying a small current or voltage to the base terminal, the emitter-base junction allows or restricts the current flow between the emitter and collector terminals. This control mechanism is essential for amplification and switching operations in transistors.Rate this question:
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- 39.
In normal operation, the emitter-base junction of a transistor is
- A.
At balanced potential
- B.
Forward biased
- C.
Reverse biased
- D.
At zero potential
Correct Answer
B. Forward biasedExplanation
The emitter-base junction of a transistor is forward biased in normal operation. This means that the voltage at the emitter terminal is higher than the voltage at the base terminal. Forward biasing allows the flow of current from the emitter to the base, enabling the transistor to amplify and control the current flowing through the collector terminal. This biasing configuration is essential for the transistor to function properly and perform its intended tasks in electronic circuits.Rate this question:
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- 40.
The transistor circuit that provides the main path for current flow is the
- A.
Emitter-base circuit
- B.
Emitter-source circuit
- C.
Base-collector circuit
- D.
Emitter-collector circuit
Correct Answer
D. Emitter-collector circuitExplanation
The emitter-collector circuit is the transistor circuit that provides the main path for current flow. In this circuit configuration, the emitter terminal is connected to the positive supply voltage, while the collector terminal is connected to the load or output. The base terminal controls the current flow between the emitter and collector terminals. This configuration allows for amplification of current and voltage, making it suitable for applications such as amplifiers and switches.Rate this question:
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- 41.
The tab on the case of a unijunction transistor (UJT) indicates the
- A.
Base lead
- B.
Gate lead
- C.
Emitter lead
- D.
Collector lead
Correct Answer
C. Emitter leadExplanation
The tab on the case of a unijunction transistor (UJT) indicates the emitter lead. The emitter lead is responsible for emitting the majority charge carriers in the UJT. The tab is typically connected to the emitter lead to provide a convenient point for heat dissipation.Rate this question:
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- 42.
What determines the amount of potential required to forward bias a unijunction transistor (UJT)?
- A.
Pinch-off voltage
- B.
Votage gradient
- C.
Input impedance
- D.
Intrinsic stand-off ratio
Correct Answer
D. Intrinsic stand-off ratioExplanation
The amount of potential required to forward bias a unijunction transistor (UJT) is determined by its intrinsic stand-off ratio. The intrinsic stand-off ratio is a characteristic of the UJT and represents the ratio of the peak point voltage to the valley point voltage. This ratio determines the amount of potential required to forward bias the UJT and activate its operation.Rate this question:
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- 43.
What component uses voltage to control the size of the current flow channel?
- A.
UJT
- B.
SCR
- C.
LED
- D.
FET
Correct Answer
D. FETExplanation
A Field-Effect Transistor (FET) is a component that uses voltage to control the size of the current flow channel. FETs are three-terminal devices, where the voltage applied to the gate terminal determines the conductivity of the channel between the source and drain terminals. By varying the gate voltage, the FET can either allow or restrict the flow of current, making it an ideal component for voltage-controlled amplification and switching applications.Rate this question:
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- 44.
In a field-effect transistor (FET) symbol, the arrow always points to the
- A.
P-type material
- B.
N-type material
- C.
P-N junction
- D.
Positive voltage potential
Correct Answer
B. N-type materialExplanation
In a field-effect transistor (FET) symbol, the arrow always points to the N-type material. This is because the arrow represents the direction of conventional current flow. In an N-type material, the majority carriers are electrons, which carry the current. Therefore, the arrow points towards the N-type material to indicate the direction of electron flow.Rate this question:
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- 45.
Which semi-conductor device has a gate that is not electrically connected to the rest of the device?
- A.
SCR
- B.
JFET
- C.
MOSFET
- D.
UJT
Correct Answer
C. MOSFETExplanation
A MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor) is a type of semiconductor device that has a gate that is not electrically connected to the rest of the device. The gate of a MOSFET is insulated from the channel by a thin layer of oxide, allowing it to control the flow of current between the source and drain terminals. This isolation of the gate from the rest of the device allows for better control and modulation of the current flow, making MOSFETs widely used in various electronic applications.Rate this question:
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- 46.
Which type of field-effect transistor (FET) has no built-in connection between the source and drain?
- A.
JFET
- B.
IGFET
- C.
Dual-gate MOSFET
- D.
Induced channel MOSFET
Correct Answer
D. Induced channel MOSFETExplanation
The induced channel MOSFET is the type of field-effect transistor (FET) that has no built-in connection between the source and drain. In this type of FET, the channel is formed by the induced charges in the substrate, and there is no physical connection between the source and drain regions. The channel is created by applying a voltage to the gate terminal, which induces a channel in the substrate. This allows for greater control over the flow of current in the transistor.Rate this question:
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- 47.
A metal oxide varistor (MOV) is made up of how many semi-conductors
- A.
2
- B.
3
- C.
4
- D.
5
Correct Answer
A. 2Explanation
An MOV is made up of two semi-conductors. A metal oxide varistor is a type of voltage-dependent resistor that is commonly used to protect electrical circuits from excessive voltage. It consists of a ceramic material made of zinc oxide, which acts as a non-linear resistor. The MOV is constructed with two layers of semi-conductive material, which allows it to have a high resistance at low voltages and a low resistance at high voltages. This characteristic enables the MOV to absorb and dissipate the excess voltage, protecting the circuit from damage.Rate this question:
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- 48.
The best method of troubleshooting is the
- A.
Systematic method
- B.
Instantaneous method
- C.
Hit-and-miss method
- D.
trial-and-error method
Correct Answer
A. Systematic methodExplanation
The systematic method is the best method of troubleshooting because it involves following a logical and organized approach to identify and solve problems. It helps in identifying the root cause of the problem by systematically analyzing and testing different components or variables. This method ensures that all possible causes are considered and eliminates guesswork or random attempts. It saves time and effort by providing a structured framework for troubleshooting, leading to more efficient and effective problem-solving.Rate this question:
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- 49.
Which troubleshooting aid is designed to promote understanding of the system?
- A.
Zones
- B.
Schematic
- C.
Wiring Diagram
- D.
Reference designation index
Correct Answer
B. SchematicExplanation
A schematic is a troubleshooting aid that is designed to promote understanding of the system. It is a diagram that represents the components and connections of a system using standardized symbols. By studying the schematic, technicians can gain a clear understanding of how the system is designed and how its various components are interconnected. This understanding is crucial for troubleshooting and diagnosing issues within the system.Rate this question:
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- 50.
Which troubleshooting aid is designed to aid you if you see an unfamiliar symbol?
- A.
Zones
- B.
Schematic
- C.
Wiring Diagram
- D.
Reference designation index
Correct Answer
D. Reference designation indexExplanation
A reference designation index is a troubleshooting aid that is designed to help you if you see an unfamiliar symbol. It provides a list of symbols and their corresponding meanings, allowing you to quickly identify and understand the symbol you are unfamiliar with. This can be particularly useful when working with complex systems or equipment that use specific symbols to represent different components or functions. By referring to the index, you can easily find the meaning of the symbol and use that information to troubleshoot and resolve any issues.Rate this question:
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Current Version
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Mar 20, 2023Quiz Edited by
ProProfs Editorial Team -
Oct 14, 2010Quiz Created by
Jnjnils
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