3502516
Descripción
Test por nicilynn1981, actualizado hace más de 1 año
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Creado por nicilynn1981
hace alrededor de 9 años
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Pregunta 1
Pregunta
Every atom must contain what types of particles?
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Electrons and protons
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Electrons and neutrons
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Protons and neutrons
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Electrons, protons and neutrons
Pregunta 2
Pregunta
An atom with 8 electrons in its outermost shell is said to be
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Free
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Stable
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Valence
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Ionized
Pregunta 3
Pregunta
How many valence electrons are needed to make a good conductor?
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3
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4
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5
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6
Pregunta 4
Pregunta
"Dielectric" is the term used for
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Conductors
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Insulators
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Doped atoms
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Semi-conductors
Pregunta 5
Pregunta
The flow or drift of electrons through a conductor” in the same direction at the same time is the definition of
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Conductivity
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Voltage
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Current
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Valence
Pregunta 6
Pregunta
The potential difference between two points in a circuit that exerts a force on free electrons is called
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Conductivity
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Voltage
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Current
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Valence
Pregunta 7
Pregunta
What is used to control current flow in a circuit?
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Voltage
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Coulombs
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Resistance
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Conductivity
Pregunta 8
Pregunta
The relationship of voltage, current and resistance is expressed through
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E, I and C
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Power formulas
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Conductance
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Ohm's Law
Pregunta 9
Pregunta
Total current in a series circuit is equal to the
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Current through one component
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Sum of the current through each component
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Reciprocal of the current through one component
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Reciprocal of the sum of the currents through each component
Pregunta 10
Pregunta
What is the wattage of a circuit with 28 volts applied and a total resistance of .2 ohms?
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.14 watts (w)
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.14 kilowatts (kW)
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3.92 W
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3.92 kW
Pregunta 11
Pregunta
In a parallel circuit, the total voltage is equal to the
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Sum of the voltages across each branch
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Voltage across each resistor
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Voltage across each branch
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The reciprocal of the voltage across the resistances
Pregunta 12
Pregunta
Source current in a parallel circuit will be divided according to branch
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Voltage
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Powers
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Lengths
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Resistances
Pregunta 13
Pregunta
The area around a magnet where its influence can be felt is the definition of the
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Saturation principle
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Magnetic theory
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Magnetic field
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Law of attraction and repulsion
Pregunta 14
Pregunta
“The ability of a material to pass lines of force” is a definition of
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Permeability
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Reluctance
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Electromagnetism
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Retentively
Pregunta 15
Pregunta
The magnetism that remains after the magnetizing force has been removed is known as
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Electromagnetism
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Molecular magnetism
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Permeability
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Residual magnetism
Pregunta 16
Pregunta
The magnetic field of an electromagnet can be varied by changing the
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Type of core
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Number of turns in the coil
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Amount of current through the coil
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All of the above
Pregunta 17
Pregunta
The electromechanical generation of a voltage requires a magnetic field, relative motion, and
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A complete circuit
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A conductor
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An insulator
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A load
Pregunta 18
Pregunta
The principle behind all electromechanical generation is
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Conduction
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Commutation
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Rectification
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Electromagnetic induction
Pregunta 19
Pregunta
The function of the commutator in a DC generator is to
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Complete the circuit to the load
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Induce DC into the external circuit
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Rectify the input
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Change AC voltage to DC voltage
Pregunta 20
Pregunta
Because an inductor stores energy and then returns it to the circuit, it is called a
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Resistive device
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Reactive device
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Retentive device
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Retroactive device
Pregunta 21
Pregunta
An inductor stores energy in the form of
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Heat
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Resistance
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A magnetic field
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An electrostatic field
Pregunta 22
Pregunta
The process by which a current change in one coil produces a voltage in another coil is called
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Inductance
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Self-induction
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Mutual induction
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None of the above
Pregunta 23
Pregunta
A transformer will change all of the following except
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Power
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Current
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Voltage
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Resistance
Pregunta 24
Pregunta
Normally, the winding of a transformer that is connected to a power source is known as the
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Field winding
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Primary winding
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Current winding
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Secondary winding
Pregunta 25
Pregunta
What kind of turns of wire is found in the secondary windings of a step up transformer?
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Equal
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Less
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More
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All of the above
Pregunta 26
Pregunta
A relay is an electrically operated
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Meter
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Motor
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Switch
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Safety device
Pregunta 27
Pregunta
A relay that, once energized, requires a second coil to be energized before the contacts will return to their original positions is called a
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Locking relay
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Latching relay
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Timing relay
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Tripping relay
Pregunta 28
Pregunta
A capacitor stores energy in the form of
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Heat
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Resistance
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A magnetic field
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An electrostatic field
Pregunta 29
Pregunta
In a capacitor, the dielectric is the
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Positive lead
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Conductor
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Insulator
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Outer case
Pregunta 30
Pregunta
Opposition of a capacitor to AC is called
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Inductive reactance
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Impedance
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Capactive reactance
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Capacitance
Pregunta 31
Pregunta
The factors which determine the time required to charge a capacitor are the capacitance and the
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Applied voltage
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Circuit current
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Amount of resistance
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Type of dielectric
Pregunta 32
Pregunta
The anode of a diode is constructed of
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Neutral material
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Biased material
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Positive material
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Negative material
Pregunta 33
Pregunta
Expanding or contracting the depletion region of a diode is called
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Basing
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Gating
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Spiking
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Biasing
Pregunta 34
Pregunta
A diode placed in a circuit in reverse bias is being used as
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A spike protector
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An amplifier
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A regulator
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A rectifier
Pregunta 35
Pregunta
A zener will conduct in reverse bias
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For a second or two at a time
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Until gate potential has been reached
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Once the avalanche point has been reached
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Until the breakdown point has been reached
Pregunta 36
Pregunta
A zener being used as a regulator must have a resistor placed in the circuit in
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Series
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Parallel
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Reverse bias
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Series-parallel
Pregunta 37
Pregunta
What is the approximate operating voltage of a LED?
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.5 volts
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.1 volt
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1.6 volts
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2.4 volts
Pregunta 38
Pregunta
The SCR has how many PN junctions?
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1
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2
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3
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4
Pregunta 39
Pregunta
The amount of current required to gate an SCR is called
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Forward break over voltage
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Holding current
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Peak voltage
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Gate current
Pregunta 40
Pregunta
In order for an SCR to be turned off
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The forward break over voltage must exceed the holding voltage.
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The current must drop below the holding current.
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The negative amp switch must activate.
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The negative volt switch must activate.
Pregunta 41
Pregunta
The best method of troubleshooting is the
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Systematic method
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Instantaneous method
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Hit-and-miss method
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Trial-and-error method
Pregunta 42
Pregunta
Which troubleshooting step is done by knowing proper equipment operation?
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Analysis
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Recognition
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Repair and check
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Elimination and isolation
Pregunta 43
Pregunta
During which troubleshooting step do you try to determine which system could cause the malfunction?
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Analysis
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Verification
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Recognition
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Elimination and isolation
Pregunta 44
Pregunta
During which troubleshooting step do you first use the schematic diagram?
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Recognition
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Verification
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Analysis
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Isolation
Pregunta 45
Pregunta
Which troubleshooting aid is designed to aid you if you see an unfamiliar symbol?
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Zones
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Schematic
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Wiring diagram
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Reference designation index
Pregunta 46
Pregunta
Which troubleshooting aid is designed to aid you in finding components on a diagram?
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Zones
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Schematic
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Wiring diagram
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Reference designation index
Pregunta 47
Pregunta
When used in a series circuit to measure voltage, how is a multimeter connected in the circuit?
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In series
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To ground
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In parallel
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In series-parallel
Pregunta 48
Pregunta
To set a value to the height of the oscilloscope grid markings, you adjust the
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Focus
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Pitch control
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Voltage selector
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Time sweep selector
Pregunta 49
Pregunta
To ensure accuracy of an oscilloscope when preparing for operation you should always,
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Zero the display
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Center the display
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Identify the cal point and adjust to zero
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Identify the cal point and calibrate the display
Pregunta 50
Pregunta
When you are testing a transformer, an open coil reading on the 8025A multimeter will be indicated by
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A beep
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An extending analog bar graph
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OL
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0 ohms
Pregunta 51
Pregunta
Which could be the indication from the 8025A multimeter when you are checking a serviceable capacitor?
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A beep
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An extending analog bar graph
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OL
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0 ohms
Pregunta 52
Pregunta
How many junctions are checked to test the serviceability of a transistor?
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1
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2
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3
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4
Pregunta 53
Pregunta
When checking a FET, you must check the diode junction and the continuity between the
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Gate and source
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Source and drain
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Gate and substrate
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Substrate and drain
Pregunta 54
Pregunta
How can you identify an electrostatic sensitive device?
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The package will have special coloring as specified in local directives.
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The package will have a special control number as specified in local directives.
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It will be marked with the MIL-STD–129 symbol or a caution marking.
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It will be marked with the MIL-SPC–235 symbol or a warning marking.
Pregunta 55
Pregunta
A heat sink is used in soldering to
Respuesta
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Prevent heat from damaging the component being soldered
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Prevent heat from damaging other components in the circuit
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Apply heat to the component being soldered
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Apply heat to other components in the circuit
Pregunta 56
Pregunta
A pitted or worn soldering iron tip should be redressed with a flat, fine, single-cut file and should be
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Tinned
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Clean of solder
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Replaced
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Checked for length
Pregunta 57
Pregunta
The first step in soldering a conductor is to
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Wick the wire
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Remove the insulation
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Apply heat to the connection
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Apply solder to the connection
Pregunta 58
Pregunta
When soldering flat perforated terminals, the conductor is connected to the terminal using
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90 degree wrap
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180 degree wrap
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270 degree wrap
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360 degree wrap
Pregunta 59
Pregunta
A wire is inserted into a solder cup until the
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Wire touches the bottom
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Wire clears the top of the cup
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Insulation touches the cup
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Wire protrudes from the weep hole
Pregunta 60
Pregunta
The best method of repairing a lifted circuit track on a PCB is to
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Bond it
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Glue it
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Replace it with bare wire
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Replace it with insulated wire
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