Technician Subelement T5 Flashcards by Nathan Delcour

Electrical current is measured in which of the following units?

A. Volts
B. Watts
C. Ohms
D. Amperes

Amperes

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Electrical power is measured in which of the following units?

A. Volts
B. Watts
C. Ohms
D. Amperes

Watts

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What is the name for the flow of electrons in an electric circuit?

A. Voltage
B. Resistance
C. Capacitance
D. Current

Current

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What is the name for a current that flows only in one direction?

A. Alternating current
B. Direct current
C. Normal current
D. Smooth current

Direct current

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What is the electrical term for the electromotive force (EMF) that causes electron flow?

A. Voltage
B. Ampere-hours
C. Capacitance
D. Inductance

Voltage

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How much voltage does a mobile transceiver typically require?

A. About 12 volts
B. About 30 volts
C. About 120 volts
D. About 240 volts

About 12 volts

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Which of the following is a good electrical conductor?

A. Glass
B. Wood
C. Copper
D. Rubber

Copper

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Which of the following is a good electrical insulator?

A. Copper
B. Glass
C. Aluminum
D. Mercury

Glass

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What is the name for a current that reverses direction on a regular basis?

A. Alternating current
B. Direct current
C. Circular current
D. Vertical current

Alternating current

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Which term describes the rate at which electrical energy is used?

A. Resistance
B. Current
C. Power
D. Voltage

Power

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What is the unit of electromotive force?

A. The volt
B. The watt
C. The ampere
D. The ohm

The volt

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What describes the number of times per second that an alternating current makes a complete cycle?

A. Pulse rate
B. Speed
C. Wavelength
D. Frequency

Frequency

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In which type of circuit is current the same through all components?

A. Series
B. Parallel
C. Resonant
D. Branch

Series

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In which type of circuit is voltage the same across all components?

A. Series
B. Parallel
C. Resonant
D. Branch

Parallel

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How many milliamperes is 1.5 amperes?

A. 15 milliamperes
B. 150 milliamperes
C. 1500 milliamperes
D. 15,000 milliamperes

1500 milliamperes

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What is another way to specify a radio signal frequency of 1,500,000 hertz?

A. 1500 kHz
B. 1500 MHz
C. 15 GHz
D. 150 kHz

1500 kHz

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How many volts are equal to one kilovolt?

A. One one-thousandth of a volt
B. One hundred volts
C. One thousand volts
D. One million volts

One thousand volts

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How many volts are equal to one microvolt?

A. One one-millionth of a volt
B. One million volts
C. One thousand kilovolts
D. One one-thousandth of a volt

One one-millionth of a volt

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Which of the following is equal to 500 milliwatts?

A. 0.02 watts
B. 0.5 watts
C. 5 watts
D. 50 watts

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?

A. 0.003 amperes
B. 0.3 amperes
C. 3 amperes
D. 3,000,000 amperes

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?

A. 0.003525 kHz
B. 35.25 kHz
C. 3525 kHz
D. 3,525,000 kHz

3525 kHz

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How many microfarads are equal to 1,000,000 picofarads?

A. 0.001 microfarads
B. 1 microfarad
C. 1000 microfarads
D. 1,000,000,000 microfarads

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. 2 dB
B. 3 dB
C. 5 dB
D. 10 dB

3 dB

What is the approximate amount of change, measured in decibels (dB), of a power decrease from 12 watts to 3 watts?

A. -1 dB
B. -3 dB
C. -6 dB
D. -9 dB

-6 dB

What is the amount of change, measured in decibels (dB), of a power increase from 20 watts to 200 watts? A. 10 dB B. 12 dB C. 18 dB D. 28 dB

10 dB

Which of the following frequencies is equal to 28,400 kHz? A. 28.400 MHz B. 2.800 MHz C. 284.00 MHz D. 28.400 kHz

28.400 MHz

If a frequency display shows a reading of 2425 MHz, what frequency is that in GHz? A. 0.002425 GHz B. 24.25 GHz C. 2.425 GHz D. 2425 GHz

2.425 GHz

What is the ability to store energy in an electric field called? A. Inductance B. Resistance C. Tolerance D. Capacitance

Capacitance

What is the basic unit of capacitance? A. The farad B. The ohm C. The volt D. The henry

The farad

What is the ability to store energy in a magnetic field called? A. Admittance B. Capacitance C. Resistance D. Inductance

Inductance

What is the basic unit of inductance? A. The coulomb B. The farad C. The henry D. The ohm

The henry

What is the unit of frequency? A. Hertz B. Henry C. Farad D. Tesla

Hertz

What does the abbreviation "RF" refer to? A. Radio frequency signals of all types B. The resonant frequency of a tuned circuit C. The real frequency transmitted as opposed to the apparent frequency D. Reflective force in antenna transmission lines

Radio frequency signals of all types

A radio wave is made up of what type of energy? A. Pressure B. Electromagnetic C. Gravity D. Thermal

Electromagnetic

What is the formula used to calculate electrical power in a DC circuit? A. Power (P) equals voltage (E) multiplied by current (I) B. Power (P) equals voltage (E) divided by current (I) C. Power (P) equals voltage (E) minus current (I) D. Power (P) equals voltage (E) plus current (I)

Power (P) equals voltage (E) multiplied by current (I)

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 B. 0.7 watts C. 23.8 watts D. 3.8 watts

138 watts

How much power is being used in a circuit when the applied voltage is 12 volts DC and the current is 2.5 amperes? A. 4.8 watts B. 30 watts C. 14.5 watts D. 0.208 watts

30 watts

How many amperes are flowing in a circuit when the applied voltage is 12 volts DC and the load is 120 watts? A. 0.1 amperes B. 10 amperes C. 12 amperes D. 132 amperes

10 amperes

What is impedance? A. A measure of the opposition to AC current flow in a circuit B. The inverse of resistance C. The Q or Quality Factor of a component D. The power handling capability of a component

A measure of the opposition to AC current flow in a circuit

What is a unit of impedance? A. Volts B. Amperes C. Coulombs D. Ohms

Ohms

What is the proper abbreviation for megahertz? A. mHz B. mhZ C. Mhz D. MHz

MHz

What formula is used to calculate current in a circuit? A. Current (I) equals voltage (E) multiplied by resistance (R) B. Current (I) equals voltage (E) divided by resistance (R) C. Current (I) equals voltage (E) added to resistance (R) D. Current (I) equals voltage (E) minus resistance (R)

Current (I) equals voltage (E) divided by resistance (R)

What formula is used to calculate voltage in a circuit? A. Voltage (E) equals current (I) multiplied by resistance (R) B. Voltage (E) equals current (I) divided by resistance (R) C. Voltage (E) equals current (I) added to resistance (R) D. Voltage (E) equals current (I) minus resistance (R)

Voltage (E) equals current (I) multiplied by resistance (R)

What formula is used to calculate resistance in a circuit? A. Resistance (R) equals voltage (E) multiplied by current (I) B. Resistance (R) equals voltage (E) divided by current (I) C. Resistance (R) equals voltage (E) added to current (I) D. Resistance (R) equals voltage (E) minus current (I)

Resistance (R) equals voltage (E) divided by current (I)

What is the resistance of a circuit in which a current of 3 amperes flows through a resistor connected to 90 volts? A. 3 ohms B. 30 ohms C. 93 ohms D. 270 ohms

30 ohms

What is the resistance in a circuit for which the applied voltage is 12 volts and the current flow is 1.5 amperes? A. 18 ohms B. 0.125 ohms C. 8 ohms D. 13.5 ohms

8 ohms

What is the resistance of a circuit that draws 4 amperes from a 12-volt source? A. 3 ohms B. 16 ohms C. 48 ohms D. 8 ohms

3 ohms

What is the current in a circuit with an applied voltage of 120 volts and a resistance of 80 ohms? A. 9600 amperes B. 200 amperes C. 0.667 amperes D. 1.5 amperes

1.5 amperes

What is the current through a 100-ohm resistor connected across 200 volts? A. 20,000 amperes B. 0.5 amperes C. 2 amperes D. 100 amperes

2 amperes

What is the current through a 24-ohm resistor connected across 240 volts? A. 24,000 amperes B. 0.1 amperes C. 10 amperes D. 216 amperes

10 amperes

What is the voltage across a 2-ohm resistor if a current of 0.5 amperes flows through it? A. 1 volt B. 0.25 volts C. 2.5 volts D. 1.5 volts

1 volt

What is the voltage across a 10-ohm resistor if a current of 1 ampere flows through it? A. 1 volt B. 10 volts C. 11 volts D. 9 volts

10 volts

What is the voltage across a 10-ohm resistor if a current of 2 amperes flows through it? A. 8 volts B. 0.2 volts C. 12 volts D. 20 volts

20 volts

What happens to current at the junction of two components in series? A. It divides equally between them B. It is unchanged C. It divides based on the on the value of the components D. The current in the second component is zero

It is unchanged

What happens to current at the junction of two components in parallel? A. It divides between them dependent on the value of the components B. It is the same in both components C. Its value doubles D. Its value is halved

It divides between them dependent on the value of the components

What is the voltage across each of two components in series with a voltage source? A. The same voltage as the source B. Half the source voltage C. It is determined by the type and value of the components D. Twice the source voltage

It is determined by the type and value of the components

What is the voltage across each of two components in parallel with a voltage source? A. It is determined by the type and value of the components B. Half the source voltage C. Twice the source voltage D. The same voltage as the source

The same voltage as the source