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

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

Question 1

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

The correct answer is D.

Question 2

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

The correct answer is A.

Question 3

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

The correct answer is D.

Question 4

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

The correct answer is C.

Question 5

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

The correct answer is A.

Question 6

 * 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

The correct answer is A.

Question 7

 * What is a usual name for electromagnetic waves that travel through space?
 * A. Gravity waves
 * B. Sound waves
 * C. Radio waves
 * D. Pressure waves

The correct answer is C.

Question 8

 * 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)

The correct answer is A.

Question 9

 * 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

The correct answer is A.

Question 10

 * 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

The correct answer is B.

Question 11

 * 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

The correct answer is B.

Question 12

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

The correct answer is A.

Question 13

 * What are the units of impedance?
 * A. Volts
 * B. Amperes
 * C. Coulombs
 * D. Ohms

The correct answer is D.