# Technician Class Exam Question Pool

effective 7/01/2014 thru 6/30/2018

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# Topic T5: Electronic Principles

T5A-2014: Electrical principles, units, and terms: current and voltage; conductors and insulators; alternating and direct current

T5A01-2014: Electrical current is measured in which of the following units?

Amperes

Volts

Watts

Ohms

T5A02-2014: Electrical power is measured in which of the following units?

Watts

Volts

Ohms

Amperes

T5A03-2014: What is the name for the flow of electrons in an electric circuit?

Current

Voltage

Resistance

Capacitance

T5A04-2014: What is the name for a current that flows only in one direction?

Direct current

Alternating current

Normal current

Smooth current

T5A05-2014: What is the electrical term for the electromotive force (EMF) that causes electron flow?

Voltage

Ampere-hours

Capacitance

Inductance

T5A06-2014: How much voltage does a mobile transceiver usually require?

T5A07-2014: Which of the following is a good electrical conductor?

Copper

Glass

Wood

Rubber

T5A08-2014: Which of the following is a good electrical insulator?

Glass

Copper

Aluminum

Mercury

T5A09-2014: What is the name for a current that reverses direction on a regular basis?

Alternating current

Direct current

Circular current

Vertical current

T5A10-2014: Which term describes the rate at which electrical energy is used?

Power

Resistance

Current

Voltage

T5A11-2014: What is the basic unit of electromotive force?

The volt

The watt

The ampere

The ohm

T5A12-2014: What term describes the number of times per second that an alternating current reverses direction?

Frequency

Pulse rate

Speed

Wavelength

T5B-2014: Math for electronics: conversion of electrical units; decibels; the metric system

T5B01-2014: How many milliamperes is 1.5 amperes?

1,500 milliamperes

15 milliamperes

150 milliamperes

15,000 milliamperes

T5B02-2014: What is another way to specify a radio signal frequency of 1,500,000 hertz?

1500 kHz

1500 MHz

15 GHz

150 kHz

T5B03-2014: How many volts are equal to one kilovolt?

One thousand volts

One one-thousandth of a volt

One hundred volts

One million volts

T5B04-2014: How many volts are equal to one microvolt?

One one-millionth of a volt

One million volts

One thousand kilovolts

One one-thousandth of a volt

T5B05-2014: Which of the following is equivalent to 500 milliwatts?

0.5 watts

0.02 watts

5 watts

50 watts

T5B06-2014: If an ammeter calibrated in amperes is used to measure a 3000-milliampere current, what reading would it show?

3 amperes

0.003 amperes

0.3 amperes

3,000,000 amperes

T5B07-2014: If a frequency readout calibrated in megahertz shows a reading of 3.525 MHz, what would it show if it were calibrated in kilohertz?

3525 kHz

0.003525 kHz

35.25 kHz

3,525,000 kHz

T5B09-2014: What is the approximate amount of change, measured in decibels (dB), of a power increase from 5 watts to 10 watts?

3 dB

2 dB

5 dB

10 dB

T5B10-2014: What is the approximate amount of change, measured in decibels (dB), of a power decrease from 12 watts to 3 watts?

-6 dB

-1 dB

-3 dB

-9 dB

T5B11-2014: What is the approximate amount of change, measured in decibels (dB), of a power increase from 20 watts to 200 watts?

10 dB

12 dB

18 dB

28 dB

T5B12-2014: Which of the following frequencies is equal to 28,400 kHz?

28.400 MHz

2.800 MHz

284.00 MHz

28.400 kHz

T5B13-2014: If a frequency readout shows a reading of 2425 MHz, what frequency is that in GHz?

2.425 GHz

0.002425 GHZ

24.25 GHz

2425 GHz

T5C-2014: Electronic principles: capacitance; inductance; current flow in circuits; alternating current; definition of RF; DC power calculations; impedance

T5C01-2014: What is the ability to store energy in an electric field called?

Capacitance

Inductance

Resistance

Tolerance

T5C02-2014: What is the basic unit of capacitance?

The ohm

The volt

The henry

T5C03-2014: What is the ability to store energy in a magnetic field called?

Inductance

Capacitance

Resistance

T5C04-2014: What is the basic unit of inductance?

The henry

The coulomb

The ohm

T5C05-2014: What is the unit of frequency?

Hertz

Henry

Tesla

T5C06-2014: What does the abbreviation “RF” refer to?

Radio frequency signals of all types

The resonant frequency of a tuned circuit

The real frequency transmitted as opposed to the apparent frequency

Reflective force in antenna transmission lines

T5C07-2014: What is a usual name for electromagnetic waves that travel through space?

Gravity waves

Sound waves

Pressure waves

T5C08-2014: What is the formula used to calculate electrical power in a DC circuit?

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

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

Power (P) equals voltage (E) minus current (I)

Power (P) equals voltage (E) plus current (I)

T5C09-2014: How much power is being used in a circuit when the applied voltage is 13.8 volts DC and the current is 10 amperes?

138 watts

0.7 watts

23.8 watts

3.8 watts

T5C10-2014: How much power is being used in a circuit when the applied voltage is 12 volts DC and the current is 2.5 amperes?

30 watts

4.8 watts

14.5 watts

0.208 watts

T5C11-2014: How many amperes are flowing in a circuit when the applied voltage is 12 volts DC and the load is 120 watts?

10 amperes

0.1 amperes

12 amperes

132 amperes

T5C12-2014: What is meant by the term impedance?

It is a measure of the opposition to AC current flow in a circuit

It is the inverse of resistance

It is a measure of the Q or Quality Factor of a component

It is a measure of the power handling capability of a component

T5C13-2014: What are the units of impedance?

Ohms

Volts

Amperes

Coulombs

T5D-2014: Ohmâ€™s Law: formulas and usage

T5D01-2014: What formula is used to calculate current in a circuit?

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

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

Current (I) equals voltage (E) added to resistance (R)

Current (I) equals voltage (E) minus resistance (R)

T5D02-2014: What formula is used to calculate voltage in a circuit?

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

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

Voltage (E) equals current (I) added to resistance (R)

Voltage (E) equals current (I) minus resistance (R)

T5D03-2014: What formula is used to calculate resistance in a circuit?

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

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

Resistance (R) equals voltage (E) added to current (I)

Resistance (R) equals voltage (E) minus current (I)

T5D04-2014: What is the resistance of a circuit in which a current of 3 amperes flows through a resistor connected to 90 volts?

30 ohms

3 ohms

93 ohms

270 ohms

T5D05-2014: What is the resistance in a circuit for which the applied voltage is 12 volts and the current flow is 1.5 amperes?

8 ohms

18 ohms

0.125 ohms

13.5 ohms

T5D06-2014: What is the resistance of a circuit that draws 4 amperes from a 12-volt source?

3 ohms

16 ohms

48 ohms

8 Ohms

T5D07-2014: What is the current flow in a circuit with an applied voltage of 120 volts and a resistance of 80 ohms?

1.5 amperes

9600 amperes

200 amperes

0.667 amperes

T5D08-2014: What is the current flowing through a 100-ohm resistor connected across 200 volts?

2 amperes

20,000 amperes

0.5 amperes

100 amperes

T5D09-2014: What is the current flowing through a 24-ohm resistor connected across 240 volts?

10 amperes

24,000 amperes

0.1 amperes

216 amperes

T5D10-2014: What is the voltage across a 2-ohm resistor if a current of 0.5 amperes flows through it?

1 volt

0.25 volts

2.5 volts

1.5 volts

T5D11-2014: What is the voltage across a 10-ohm resistor if a current of 1 ampere flows through it?

10 volts

1 volt

11 volts

9 volts

T5D12-2014: What is the voltage across a 10-ohm resistor if a current of 2 amperes flows through it?

20 volts

8 volts

0.2 volts

12 volts

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