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Electrical current is measured in which of the following units?
D. Amperes
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Electrical power is measured in which of the following units?
B. Watts
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What is the name for the flow of electrons in an electric circuit?
B. Current
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What is the name for a current that flows only in one direction?
D. Direct current
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What is the electrical term for the electromotive force (EMF) that causes electron flow?
C. Voltage
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How much voltage does a mobile transceiver typically require?
A. About 12 volts
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Which of the following is a good electrical conductor?
B. Copper
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Which of the following is a good electrical insulator?
C. Glass
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What is the name for a current that reverses direction on a regular basis?
C. Alternating current
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Which term describes the rate at which electrical energy is used?
C. Power
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What is the unit of electromotive force?
A. The volt
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What describes the number of times per second that an alternating current makes a complete cycle?
C. Frequency
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In which type of circuit is current the same through all components?
D. Series
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In which type of circuit is voltage the same across all components?
C. Parallel
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How many milliamperes is 1.5 amperes?
C. 1500 milliamperes
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What is another way to specify a radio signal frequency of 1,500,000 hertz?
B. 1500 kHz
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How many volts are equal to one kilovolt?
D. One thousand volts
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How many volts are equal to one microvolt?
B. One one-millionth of a volt
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Which of the following is equal to 500 milliwatts?
C. 0.5 watts
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If an ammeter calibrated in amperes is used to measure a 3000- milliampere current, what reading would it show?
B. 3 amperes
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If a frequency display calibrated in megahertz shows a reading of 3.525 MHz, what would it show if it were calibrated in kilohertz?
C. 3525 kHz
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How many microfarads are equal to 1,000,000 picofarads?
B. 1 microfarad
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What is the approximate amount of change, measured in decibels (dB), of a power increase from 5 watts to 10 watts?
A. 3 dB
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What is the approximate amount of change, measured in decibels (dB), of a power decrease from 12 watts to 3 watts?
B. -6 dB
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What is the amount of change, measured in decibels (dB), of a power increase from 20 watts to 200 watts?
B. 10 dB
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Which of the following frequencies is equal to 28,400 kHz?
D. 28.400 MHz
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If a frequency display shows a reading of 2425 MHz, what frequency is that in GHz?
B. 2.425 GHz
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What is the ability to store energy in an electric field called?
D. Capacitance
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What is the basic unit of capacitance?
C. The farad
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What is the ability to store energy in a magnetic field called?
C. Inductance
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What is the basic unit of inductance?
B. The henry
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What is the unit of frequency?
A. Hertz
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What does the abbreviation "RF" refer to?
B. Radio frequency signals of all types
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A radio wave is made up of what type of energy?
C. Electromagnetic
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What is the formula used to calculate electrical power in a DC circuit?
D. Power (P) equals voltage (E) multiplied by current (I)
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How much power is being used in a circuit when the applied voltage is 13.8 volts DC and the current is 10 amperes?
A. 138 watts
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How much power is being used in a circuit when the applied voltage is 12 volts DC and the current is 2.5 amperes?
B. 30 watts
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How many amperes are flowing in a circuit when the applied voltage is 12 volts DC and the load is 120 watts?
D. 10 amperes
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What is impedance?
B. A measure of the opposition to AC current flow in a circuit
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What is a unit of impedance?
D. Ohms
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What is the proper abbreviation for megahertz?
B. MHz
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What formula is used to calculate current in a circuit?
B. Current (I) equals voltage (E) divided by resistance (R)
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What formula is used to calculate voltage in a circuit?
A. Voltage (E) equals current (I) multiplied by resistance (R)
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What formula is used to calculate resistance in a circuit?
C. Resistance (R) equals voltage (E) divided by current (I)
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What is the resistance of a circuit in which a current of 3 amperes flows through a resistor connected to 90 volts?
B. 30 ohms
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What is the resistance in a circuit for which the applied voltage is 12 volts and the current flow is 1.5 amperes?
A. 8 ohms
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What is the resistance of a circuit that draws 4 amperes from a 12-volt source?
B. 3 ohms
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What is the current in a circuit with an applied voltage of 120 volts and a resistance of 80 ohms?
C. 1.5 amperes
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What is the current through a 100-ohm resistor connected across 200 volts?
A. 2 amperes
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What is the current through a 24-ohm resistor connected across 240 volts?
B. 10 amperes
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What is the voltage across a 2-ohm resistor if a current of 0.5 amperes flows through it?
D. 1 volt
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What is the voltage across a 10-ohm resistor if a current of 1 ampere flows through it?
D. 10 volts
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What is the voltage across a 10-ohm resistor if a current of 2 amperes flows through it?
B. 20 volts
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What happens to current at the junction of two components in series?
C. It is unchanged
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What happens to current at the junction of two components in parallel?
B. It divides between them dependent on the value of the components
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What is the voltage across each of two components in series with a voltage source?
C. It is determined by the type and value of the components
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What is the voltage across each of two components in parallel with a voltage source?
D. The same voltage as the source
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