General Radiotelephone: Principles

Question 1

What is the description of a square wave?

Answer 1

A wave that abruptly changes back and forth between two voltage levels and stays at these levels for equal amounts of time.

Question 2

How many degrees are there in one complete sine wave cycle?

Answer 2

360 degrees

Question 3

What is a sine wave?

Answer 3

A wave whose amplitude at any given instant can be represented by the projection of a point on a wheel rotating at a uniform speed.

Question 4

What type of wave is characterized by a rise time significantly faster then. The fall time ( or vice versa)?

Answer 4

Sawtooth wave.

Question 5

What type of wave is made up of sine waves of the fundamental frequency and all the odd harmonics?

Answer 5

Square

Question 6

What type of wave is made up of sine waves at the fundamental frequency and all the harmonics?

Answer 6

Sawtooth wave

Question 7

Which of the 4 groups of metals listed below are the best low-resistance conductors?

Answer 7

Gold, silver, and copper

Question 8

Good conductors with minimum resistance have what type of electrons?

Answer 8

Many free electrons

Question 9

What formula would calculate the total inductance of inductors in series?

Answer 9

LT = L1 + L2

Question 10

How would you calculate the total capacitance of three capacitors in parallel?

Answer 10

CT = C1 + C2 + C3

Question 11

How might you reduce the inductance of an antenna coil?

Answer 11

Reduce the number of turns.

Question 12

What is the purpose of a bypass capacitor?

Answer 12

It removes alternating current by providing a low impedance path to ground.

Question 13

What device is used to store electrical energy in an electrostatic field?

Answer 13

Capacitor

Question 14

What is the basic unit of electrical power?

Answer 14

Watt

Question 15

What formula would determine the inductive reactance of a coil if frequency and coil inductance are known?

Question 16

What formula would determine the inductive reactance of a coil if frequency and coil inductance are known?

Answer 16

XL = 2πfL

Question 17

What is the term used to express the amount of electrical energy stored in an electrostatic field?

Answer 17

Joules

Question 18

The product of the readings of an AC voltmeter and AC ammeter is called?

Answer 18

Apparent power

Question 19

What is the term for the out-of-phase power associated with inductors and capacitors?

Answer 19

Reactive power

Question 20

What will produce a magnetic field?

Answer 20

A current flowing through a conductor.

Question 21

When induced currents produce expanding magnetic fields around conductors in a direction that opposes the original magnetic field, this is known as:

Answer 21

Lenz’s Law