# CDC 2A652 Vol. 2

60 Questions | Total Attempts: 2840  Settings  Aerospace Ground Equipment Journeyman Electrical and Electrical Circuits and Components. Edit Code 05.

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• 1.
Every atom must contain what types of particles?
• A.

Electrons and protons.

• B.

Electrons and neutrons.

• C.

Protons and neutrons.

• D.

Electrons, protons, and neutrons.

• 2.
An atom with eight electrons in its outermost shell is said to be
• A.

Free.

• B.

Stable.

• C.

Valence.

• D.

Ionized.

• 3.
How many valence electrons are needed to make a good conductor?
• A.

3.

• B.

4.

• C.

5.

• D.

6.

• 4.
"Dielectric" is the term used for
• A.

Conductors.

• B.

Insulators.

• C.

Doped atoms.

• D.

Semi-conductors.

• 5.
"The flow or drift of electrons through a conductor" in the same direction at the same time is
• A.

Conductivity.

• B.

Voltage.

• C.

Current.

• D.

Valence.

• 6.
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.

• 7.
What is used to control current flow in a circuit?
• A.

Voltage.

• B.

Coulombs.

• C.

Resistance.

• D.

Conductivity.

• 8.
The relationship of voltage, current, and resistance is expressed through
• A.

E, I, and C.

• B.

Power formulas.

• C.

Conductance.

• D.

Ohm's Law.

• 9.
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 on component.

• D.

Reciprocal of the sum of the currents through each component.

• 10.
What is the wattage of a circuit with 28 volts applied and a total resistance of .2 ohms?
• A.

.14 watts (w)

• B.

.14 kilowatts (kw)

• C.

3.92 w.

• D.

3.92 kw.

• 11.
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.

• 12.
Source current in a parallel circuit will be divided according to branch
• A.

Voltage.

• B.

Powers.

• C.

Lengths.

• D.

Resistances.

• 13.
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.

• 14.
"The ability of a material to pass lines of force" is a definition of
• A.

Permeability.

• B.

Reluctance.

• C.

Electromagnetism.

• D.

Retentivity.

• 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.

• 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.

Amount of current in the coil.

• D.

All of the above.

• 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.

• 18.
The principle behind all electromechanical generation is
• A.

Conduction.

• B.

Commutation.

• C.

Rectification.

• D.

Electromagnetic induction.

• 19.
The function of the commutator in a DC generator is to
• A.

Complete the circuit to the load.

• B.

Induce DC into the external circuit.

• C.

Rectify the input.

• D.

Change AC voltage to DC voltage.

• 20.
Because an inductor stores energy and then returns it to the circuit, it is called a
• A.

Resistive device.

• B.

Reactive device.

• C.

Retentive device.

• D.

Retroactive device.

• 21.
An inductor stores energy in the form of
• A.

Heat.

• B.

Resistance.

• C.

A magnetic field.

• D.

An electrostatic field.

• 22.
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.

• 23.
A transformer will change all of the following except
• A.

Power.

• B.

Current.

• C.

Voltage.

• D.

Resistance.

• 24.
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.

• 25.
What kind of turns of wire is found in the secondary windings of a step up transformer?
• A.

Equal.

• B.

Less.

• C.

More.

• D.

All of the above.

• 26.
A relay is an electrically operated
• A.

Meter.

• B.

Motor.

• C.

Switch.

• D.

Safety device.

• 27.
A relay that, once energized, requires a second coil to be energized before the contacts will return to their original positions is called
• A.

Locking relay.

• B.

Latching relay.

• C.

Timing relay.

• D.

Tripping relay.

• 28.
A capacitor stores energy in the form of
• A.

Heat.

• B.

Resistance.

• C.

A magnetic field.

• D.

An electrostatic field.

• 29.
In a capacitor, the dielectric is the
• A.

• B.

Conductor.

• C.

Insulator.

• D.

Outer case.

• 30.
Opposition of a capacitor to AC is called
• A.

Inductive reactance.

• B.

Impedance.

• C.

Capacitive reactance.

• D.

Capacitance.

• 31.
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.

• 32.
The anode of a diode is constructed of
• A.

Neutral material.

• B.

Biased material.

• C.

Positive material.

• D.

Negative material.

• 33.
Expanding or contracting the depletion region of a diode is called
• A.

Basing.

• B.

Gating.

• C.

Spiking.

• D.

Biasing.

• 34.
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.

• 35.
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 bene reached.

• D.

Until the breakdown point has been reached.

• 36.
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.

• 37.
What is the approximate operating voltage of a LED?
• A.

.5 volts.

• B.

.1 volt.

• C.

1.6 volts.

• D.

2.4 volts.

• 38.
The SCR has how many PN junctions?
• A.

One.

• B.

Two.

• C.

Three.

• D.

Four.

• 39.
The amount of current required to gate an SCR is called
• A.

Forward breakover voltage.

• B.

Holding current.

• C.

Peak voltage.

• D.

Gate current.

• 40.
In order for an SCR to be turned off
• A.

The forward breakover voltage must exceed the holding voltage.

• B.

The current must drop below the holding current.

• C.

The negative amp switch must activate.

• D.

The negative volt switch must activate.

• 41.
The best method of troubleshooting is the
• A.

Systematic method.

• B.

Instantaneous method.

• C.

Hit-and-miss method.

• D.

Trial-and-error method.

• 42.
Which troubleshooting step is done by knowing proper equipment operation?
• A.

Analysis.

• B.

Recognition.

• C.

Repair and check.

• D.

Elimination and isolation.

• 43.
During which troubleshooting step do you try to determine which system could cause the malfunction?
• A.

Analysis.

• B.

Verification.

• C.

Recognition.

• D.

Elimination and isolation.

• 44.
During which troubleshooting step do your first use the schematic diagram?
• A.

Recognition.

• B.

Verification.

• C.

Analysis.

• D.

Isolation.

• 45.
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.

• 46.
Which troubleshooting aid is designed to aid you in finding components in a diagram?
• A.

Zones.

• B.

Schematic.

• C.

Wiring diagram.

• D.

Reference designation index.

• 47.
When used in a series circuit to measure voltage, how is a multimeter connected in the circuit?
• A.

In series.

• B.

To ground.

• C.

In parallel.

• D.

In series-parallel.

• 48.
To set a value to the height of the oscilloscope grid markings, you adjust the
• A.

Focus.

• B.

Pitch control.

• C.

Voltage selector.

• D.

Time sweep selector.

• 49.
To ensure accuracy of an oscilloscope when preparing for operation you should always,
• A.

Zero the display.

• B.

Center the display.

• C.

Identify the cal point and adjust to zero.

• D.

Identify the cal point and calibrate the display.

• 50.
When you are testing a transformer, an open coil reading on the 8025A multimeter will be indicated by
• A.

A beep.

• B.

An extending analog bar graph.

• C.

OL.

• D.

0 ohms.

• 51.
Which could be the indication from the 8025A multimeter when you are checking a serviceable capacitor?
• A.

A beep.

• B.

An extending analog bar graph.

• C.

OL.

• D.

0 ohms.

• 52.
How many junctions are checked to test the serviceability of a transistor?
• A.

1.

• B.

2.

• C.

3.

• D.

4.

• 53.
When checking a FET, you must check the diode junction and the continuity between the
• A.

Gate and source.

• B.

Source and drain.

• C.

Gate and substrate.

• D.

Substrate and drain.

• 54.
How can you identify an electrostatic sensitive device?
• A.

The package will have special coloring as specified in local directives.

• B.

The package will have a special control number as specified in local directives.

• C.

It will be marked with the MIL-STD-129 symbol or a caution marking.

• D.

It will be marked with the MIL-SPC-235 symbol or a warning marking.

• 55.
A heat sink is used in soldering to
• A.

Prevent heat from damaging the component being soldered.

• B.

Prevent heat from damaging other components in the circuit.

• C.

Apply heat to the component being soldered.

• D.

Apply heat to other components in the circuit.

• 56.
A pitted or worn soldering iron tip should be redressed with a flat, fine, single-cut file and should be
• A.

Tinned.

• B.

Clean of solder.

• C.

Replaced.

• D.

Checked for length.

• 57.
The first step in soldering a conductor is to
• A.

Wick the wire.

• B.

Removed the insulation.

• C.

Apply heat to the connection.

• D.

Apply solder to the connection.

• 58.
When soldering flat perforated terminals, the conductor is connected to the terminal using a
• A.

90 degree wrap.

• B.

180 degree wrap.

• C.

270 degree wrap.

• D.

360 degree wrap.

• 59.
A wire is inserted into a solder cup until the
• A.

Wire touches the bottom.

• B.

Wire clears the top of the cup.

• C.

Insulation touches the cup.

• D.

Wire protrudes from the weep hole.

• 60.
The best method of repairing a lifted circuit track on a PCB is to
• A.

Bond it.

• B.

Glue it.

• C.

Replace it with bare wire.

• D.

Replace it with insulated wire.