Quiz 1

Question 1

When distributed by transmission lines, power loss is due to the ____ of the wire that generates heat in the conductor. The heat is generated as a result of ____ flowing through the conductor.

Answer 1

Resistance / Current

Question 2

The distance an electromagnetic wave or signal can travel during one cycle of alternating voltage is known as the _______

Answer 2

wavelength

Question 3

Effective voltage is equal to

Answer 3

RMS or PEAK VOLTAGE X .707

Question 4

The effective voltage of a circuit that has an average voltage of 150 volts is?

Answer 4

150 X 1.11 = 166.5 OR 167V

Question 5

Reducing the resistance of the wire by one-half will reduce power loss by (___), but reducing the current by one - half will reduce the power loss by (__).

Answer 5

50% / 75%
Power loss Formula
P=I^2 X R

Question 6

At (___) degrees on a sine wave is the voltage at its maximum negative value.

Answer 6

270

Question 7

Calculate the total circuit resistance for a circuit that has five 225 ohm resistors in parallel. ( __)

Answer 7

45OHMS

225 / 5 = 45

Question 8

The letter commonly used for representing electrical current is (__)

Answer 8

I = Current

Question 9

Current and voltage in an AC resistive circuit are (___) phase.

Answer 9

In phase

Question 10

(___) power in a circuit is the voltage at a certain instant multiplied by the current at that same instant.

Answer 10

Instantaneous

Question 11

The total resistance of a series circuit containing resistors valued at 6KΩ, 150Ω, 3.5kΩ, and 90Ω is (____)

Answer 11

9.74k

150+6,000+3,500+90
=9,740

Question 12

Determine the sine of angle theta.

20/ |12 __16

Answer 12

0.6

12/20=0.6

Question 13

When there is not time displacement between voltage and current they are said to be (____)

Answer 13

in phase

Question 14

The magnitude of both scalar and vector quantities are represented by the (____) of a line.

Answer 14

length

Question 15

An (____) is an AC voltage waveform which is in the positive direction for some period of time and in the negative direction for some period of time.

Answer 15

sine wave

Question 16

Vectors can be (____) using the parallelogram method.

Answer 16

added

Question 17

When an AC voltage is given, it is always the (___) value unless stated otherwise.

Answer 17

RMS

Question 18

Power factor is a numeric ratio applied to the (apparent) power to yield the (____) power.

Answer 18

True

Question 19

When the current and the voltage sine waves are (_____), they both have the same frequency, crossing the reference line at the same time and going in the same direction.

Answer 19

in-phase

Question 20

At what degrees on the sine wave is the voltage equal to zero. (_____)

Answer 20

0, 180, 360

Question 21

One horsepower equals (___) watts.

Answer 21

746

Question 22

In a direct current (___) circuit, the current flows in (a single) direction, but in an alternating current (____) circuit, current flows in (both) direction(s).

Answer 22

DC / AC

Question 23

An electric current is defined as the flow of (_____) through a conductor.

Answer 23

electrons

Question 24

Each time the generated voltage within a generator alternator reverses polarity, the current in an external circuit connected through slip rings to the generator alternator (_________)

Answer 24

reverses direction

Question 25

Pk -> Rms

Answer 25

.707

Question 26

Pk -> Avg

Answer 26

.637

Question 27

RMS -> Avg

Answer 27

.9

Question 28

AVG -> Rms

Answer 28

1.11

Question 29

As a generator armature makes one full revolution, it goes through (___) of mechanical rotation.

Answer 29

(360°)

Question 30

Sine waves are so named because the voltage at any point along the wave form is equal to the maximum, or peak, value times the (____) of the angle of rotation.

Answer 30

sine

Question 31

A single vector produced from combining two or more vectors is called the (_____).

Answer 31

resultant

Question 32

Which of the following statements is true?

Answer 32

Vector quantities display both magnitude and direction of force.

Question 33

The total current limiting effect of an inductor is called (___)

Answer 33

impedance

Question 34

Inductive reactance is the induction of (____) that opposes the (_____) in coil.

Answer 34

voltage / current flow

Question 35

The unit of measurement for representing the opposition to electrical current flow is the (___)

Answer 35

ohm

Question 36

When a conductor cuts the magnetic flux lines at (___) , the maximum voltage will be induced into the conductor.

Answer 36

(90°)

Question 37

Each complete sine wave form of 360° is called a(n) (____)

Answer 37

cycle

Question 38

A measurement taken from zero to the highest value obtained in either the positive or negative half of a sine wave would determine (_____)

Answer 38

(the peak value)

Question 39

Determine the tangent of angle theta. / 20 |12 __ 16

Answer 39

0.75 12/16=.75

Question 40

The magnitude of both scalar and vector quantities are represented by the (____) of a line.

Answer 40

length

Question 41

The unit of measurement for representing electrical power is the (____)

Answer 41

watt

Question 42

Skin effect can be reduced by using (____) conductors.

Answer 42

stranded

Question 43

In an AC circuit, current flows alternately in (____) directions.

Answer 43

two

Question 44

The tendency of AC current to flow in the surface area of a conductor and not evenly throughout the conductor is referred to as (______)

Answer 44

(skin effect)

Question 45

AC is converted from one level of voltage for transmission and then reduced to a different level of voltage for utilization by the end-user by using (______)

Answer 45

transformers