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

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

The Question Pool

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.