Quizzes Flashcards by Kyle Halverson

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

Acute

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A triangle which contains only two equal sides is an?

Isosceles

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State the supplement of

a) 37 degrees
b) 61 degrees

a) 143 degrees

b) 119 degrees

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State the complement of

a) 37 degrees
b) 61 degrees

a) 53 degrees

b) 29 degrees

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

68 degrees

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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?

39 degrees

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Name the sides

Z=
X=
R=

Z= Impedance 
X= Reactance 
R= Resistance

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Name the sides

VA = \_\_\_\_\_\_\_\_\_\_\_\_power 
VAR= \_\_\_\_\_\_\_\_\_\_\_\_power 
Watts= \_\_\_\_\_\_\_\_\_\_\_power

VA= apparent power 
VAR= reactive power 
Watts= true power

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Adds to 90 degrees?

complementary triangle

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adds to 180 degrees?

supplementary

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The rotating part of an alternator is called the _______

rotor

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stationary part of an alternator is called the ________

stator

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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?

because brushes have both current and voltage limitations

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what are the brushes made of?

graphite

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

right

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which is the hypotenuse?

VA
VARS
WATTS

What is the left hand rule for conductors?

thumb - current

fingers - flux lines

Left hand rule for coils?

thumb - north

fingers - direction of electron flow

What is the left hand rule for generators?

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

Most AC meters read?

effective values

Most DC meters read?

average values

In an AC system what would a DC meter read?

practically zero

usually made of brass?

slip rings

a value for flux density ?

tesla

another name for cycles per second?

hertz

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

brushes limit current and voltage no adjustments for flux density limited to smaller alternators

first component that would ware out in an alternator?

brushes

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

Sine wave

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

alternation

How many cycles does a wave travel in 2.5 cycles?

2.5 x 360 = 900°

commercially used AC is generated at ________ cycles/second?

Another term for cycles per second is

hertz

briefly explain the difference between electrical degrees and mechanical degrees?

electrical - time mechanical - distance

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

conductor field motion

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

zero volts right

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

RMS also known as?

effective value

Peak can also be called?

maximum or amplitude