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AC Circuit Analysis > Quizzes > Flashcards

Quizzes Flashcards

1
Q

An angle which is less than 90 degrees is commonly called?

A

Acute

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2
Q

A triangle which contains only two equal sides is an?

A

Isosceles

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3
Q

State the supplement of

a) 37 degrees
b) 61 degrees

A

a) 143 degrees

b) 119 degrees

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4
Q

State the complement of

a) 37 degrees
b) 61 degrees

A

a) 53 degrees

b) 29 degrees

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5
Q

In a right triangle, if one of the acute angles is 22 degrees, how big is the other acute angle?

A

68 degrees

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6
Q

If the angle between the two equal sides of an isosceles triangle is 102 degrees, What is the value of each of the other two angles?

A

39 degrees

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7
Q

Name the sides

Z=
X=
R=

A 
Z= Impedance 
X= Reactance 
R= Resistance
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8
Q

Name the sides

VA = \_\_\_\_\_\_\_\_\_\_\_\_power 
VAR= \_\_\_\_\_\_\_\_\_\_\_\_power 
Watts= \_\_\_\_\_\_\_\_\_\_\_power
A 
VA= apparent power 
VAR= reactive power 
Watts= true power
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9
Q

Adds to 90 degrees?

A

complementary triangle

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10
Q

adds to 180 degrees?

A

supplementary

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11
Q

The rotating part of an alternator is called the _______

A

rotor

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12
Q

stationary part of an alternator is called the ________

A

stator

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13
Q

Why is it more practical to have the armature as the stator and the field poles as the rotor and the load connected to the armature?

A

because brushes have both current and voltage limitations

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14
Q

what are the brushes made of?

A

graphite

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15
Q

two angles of a triangle measure 54degrees and 36degrees respectively. what time of angle is the remaining angle?

A

right

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16
Q

which is the hypotenuse?

VA
VARS
WATTS

A

VA

17
Q

What is the left hand rule for conductors?

A

thumb - current

fingers - flux lines

18
Q

Left hand rule for coils?

A

thumb - north

fingers - direction of electron flow

19
Q

What is the left hand rule for generators?

A

thumb - motion of conductor
pointer - magnetic flux
Middle - electron flow

20
Q

Most AC meters read?

A

effective values

21
Q

Most DC meters read?

A

average values

22
Q

In an AC system what would a DC meter read?

A

practically zero

23
Q

usually made of brass?

A

slip rings

24
Q

a value for flux density ?

A

tesla

25
Q

another name for cycles per second?

A

hertz

26
Q

there characteristics of a simple alternator that are a disadvantage and limits their use?

A

brushes limit current and voltage

no adjustments for flux density

limited to smaller alternators

27
Q

first component that would ware out in an alternator?

A

brushes

28
Q

Alternating current waveforms have a symmetrical shape. What is the name of this type of waveform?

A

Sine wave

29
Q

The first 180° of electrical generation is referred to as the positive _________?

A

alternation

30
Q

How many cycles does a wave travel in 2.5 cycles?

A

2.5 x 360 = 900°

31
Q

commercially used AC is generated at ________ cycles/second?

A

60

32
Q

Another term for cycles per second is

A

hertz

33
Q

briefly explain the difference between electrical degrees and mechanical degrees?

A

electrical - time

mechanical - distance

34
Q

To induce an EMF, we require a length of ________, a magnetic ______ and relative ________ between the two

A

conductor

field

motion

35
Q

If a conductor is travelling parallel with the magnetic field the induced voltage would be ______, and the maximum voltage would be induced if the conductor cuts the field at _______ angles

A

zero volts

right

36
Q

The internal voltage induced in the armature of any generator is ________ Ac or Dc?

A

AC

37
Q

RMS also known as?

A

effective value

38
Q

Peak can also be called?

A

maximum or amplitude

AC Circuit Analysis (3 decks)

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