FCC Technician Class Exam Study Guide - 2014-2018/Subelement T5 Group B

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

Question 1

 * How many milliamperes is 1.5 amperes?
 * A. 15 milliamperes
 * B. 150 milliamperes
 * C. 1,500 milliamperes
 * D. 15,000 milliamperes

The correct answer is C.

Question 2

 * 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

The correct answer is A.

Question 3

 * 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

The correct answer is C.

Question 4

 * 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

The correct answer is A.

Question 5

 * Which of the following is equivalent to 500 milliwatts?
 * A. 0.02 watts
 * B. 0.5 watts
 * C. 5 watts
 * D. 50 watts

The correct answer is B.

Question 6

 * 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

The correct answer is C.

Question 7

 * If a frequency readout 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

The correct answer is C.

Question 8

 * How many microfarads are 1,000,000 picofarads?
 * A. 0.001 microfarads
 * B. 1 microfarad
 * C. 1000 microfarads
 * D. 1,000,000,000 microfarads

The correct answer is B.

Question 9

 * 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

The correct answer is B.

Question 10

 * 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

The correct answer is C.

Question 11

 * What is the approximate 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

The correct answer is A.

Question 12

 * 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

The correct answer is A.

Question 13

 * If a frequency readout 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

The correct answer is C.