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G3 Exam Prep > Electrical > Flashcards

Electrical Flashcards

1
Q

The “law of electrical charge” is …

A

Opposite charges attract each other; like charges repel each other

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2
Q

electrical current (or flow of electrons) in a wire may cause

A
  • Friction, and therefore heat
  • Opposite electrical charge to be induced in another material
  • A magnetic field around the wire
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3
Q

Materials that easily conduct electricity are called

A

Conductors

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4
Q

Materials that do not easily conduct electricity are called

A

Insulators

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5
Q

T or F

electricity will flow freely through a closed switch

A

T

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6
Q

electromotive force, or EMF is another term for …

A

voltage

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7
Q

an ampere is a unit of measurement for …

A

Electrical current

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8
Q

Electrical current is measured in

A

Amps

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9
Q

electrical potential is measured in:

A

Volts

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10
Q

Electrical resistance is measured in

A

Ohms

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11
Q

when checking to determine an unknown supply voltage with an analogue metre having ranges of 0-50 v, 0 - 200 V, 0 - 600 V, and 0 - 1000 V, which range should be selected?

A

0 - 1000v

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12
Q

Which metre is used to check for electrical potential?

A

Volt Meter

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13
Q

which metre is used to check for electrical continuity ?

A

Ohm metre

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14
Q

when checking an electrical circuit with an ohm meter, a reading of “OL” or “ infinity symbol oo” indicates

A

Open circuit

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15
Q

T or F

Test leads must be disconnected when changing the function select dial

A

T

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16
Q

T or F

No. 14 AWG electrical wire is thicker than NO. 16 electrical wire, and can carry more electrical current safely.

A

T

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17
Q

what insulator colour would be used for a ground wire?

A

Green or bear

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18
Q

What insulator colour would be used for the L2 (neutral) wire?

A

White or gray

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19
Q

what insulator colour would be used for L1 (source or hot ) wire?

A

Black, red, blue, yellow

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20
Q

The ohm metre reading across a good fuse that has been removed from the circuit, will be …

A

0 ohms

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21
Q

The ohmmeter reading across a blown fuse that is removed from the circuit, will be …

A

infinity

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22
Q

A badly burned or charred fuse indicates

A

A short circuit

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23
Q

T or F

A voltage drop never occurs across a switch

A

F

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24
Q

The line connection terminals on a 120 V receptacle are
A) Gold
B) Green
C) Silver
D) Black

A

A) Gold

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25
Q

The neutral connection terminals on a 120 V receptacle are

a) green
b) gold
c) silver
d) black

A

c) silver

26
Q

Ohms law states …

A

it takes one Volt to push one Amp through one Ohm

27
Q

if voltage is increased in a simple circuit, current will

A

Increase

28
Q

Given a constant supply voltage, if resistance increases in a simple circuit, current will …

A

Decrease

29
Q

Electrical power is measured in units of what

A

Watts

30
Q

One horsepower of mechanical power is equal to _______ watts of electrical power

a) 24
b) 56
c) 746
d) 1346

A

c) 746

31
Q

Which of the following changes to an electrical current will increase power delivery to the load

A, current can be increased
B, resistance can be decreased
C, voltage can be increased
D, all of the above

A

D, all of the above

32
Q

One Watt is equals ______ Btuh

A

3.41

33
Q

what is the BTU output of an electric heater rated at 20 kW

A

68,240

34
Q

T of F

If one load fails in a series circuit, then all loads will stop operating

A

T

35
Q

with constant supply voltage, what will be the effect on total current if the resistance is decreased in any one branch circuit of a parallel circuit?

A

Amperage will increase

36
Q

The amperage rating, at any point in a parallel circuit will be

A

Different on the main line, compared to each branch line

37
Q

If the voltage drop across a load in a simple circuit is not the applied voltage, this indicates

A

There is more than one load wired in series with the tested load

38
Q

The equivalent resistance of 20w resistors connected in parallel is

A

10w

39
Q

The equivalent resistance of two 20w resistors connected in series is

A

40w

40
Q

total resistance (Rt) in a series circuit is equal to

a) supply amperage
b) supply voltage
c) some of each individual resistance in a circuit
d) the true RMS reading

A

c) some of each individual resistance in a circuit

41
Q

in North America, AC power is produced at a frequency of _____ cycles per second (also_____ hertz)

A

60

42
Q

back EMF is an electrical term that means

A

Induced voltage from the coil of an inducer that opposes applied voltage

(wires are too close together and create a magnetic field)

43
Q

An ohmmeter reading across the wires on a good induction coil will indicate

a) infinite resistance
b) measurable resistance
c) zero resistance
d) fluctuating resistance

A

b) Measurable resistance

44
Q

an ohmmeter reading between a good solenoid coil, and the solenoid casing will indicate

a) infinite resistance
b) measurable resistance
c) zero resistance
d) fluctuating resistance

A

a) infinite resistance

45
Q

T or F

The current draw of an electric motor is constant from start to finish

A

F

(draws more at the start)

46
Q

If there are more turns of wire on the primary windings of a transformer, then on the secondary winding, the transformer is called a

A

Step down transformer

47
Q

ignition transformers are Step- ____ transformers

A

Step-up

48
Q

Transformers which produce a secondary voltage that is higher than the primary voltage are called

A

step-up transformers

49
Q

How far into a junction box must conductors extend

A

6”

50
Q

Which class of fire extinguisher should be used to extinguish an electrical fire?

A

Class C

51
Q

what device converts DC to AC

A

Inverter

52
Q

what device has a capacitor connected to it

A

Blower Motor

53
Q

The 24V control circuit supply on a residential furnace comes from a

30/24v step down
240/24v step down
120/24v step down
240/24v step up

A

120/24v step down

54
Q

an infinity or OL ohm metre reading taken across two disconnected wires of a solenoid relay coil indicate that …

a) The coil is good
b) The coil wire is broken
c) The coil wire is shorted to the casing off the device
d) all of the above

A

b) coil wire is broken

55
Q

when using an ammeter, that is not “clamp on” type a metre to measure current, how must the ammeter be connected into the circuit?

a) in parallel with the circuit, with the circuit de energized
b) in parallel with the circuit, with the circuit energized
c) in series with the circuit, with the circuit de energized
d) in the series with the circuit, with the circuit energized

A

d) in the series with the circuit, with the circuit energized

56
Q

if your metre is set to measure voltage and you have it across a closed switch on a 120 vac circuit, the reading should be?

a) 0 whether the circuit is energized or not
b) 120 if the circuit is de energized
c) 120 if at least one leg of the circuit is energized
d) 24 if the circuit is energized

A

a) 0 whether the circuit is energized or not

57
Q

if your metre is set to measure voltage and you have it across an open switch on a 120 VAC circuit, the reading should be?

a) 0 whether the circuit is energized or not
b) 120 if the circuit is de energized
c) 120 if at least one leg of the circuit is energized
d) 24 if the circuit is energized

A

c) 120 if at least one leg of the circuit is energized

58
Q

What Is the Device that converts AC to DC

A

Rectifier

59
Q

the VA rating on a transformer indicates :

a) the available power to the primary circuit
b) the available power to the secondary circuit
c) the transformer uses “varying amperage”
d) the transformer can only use dc power

A

b) the available power to the secondary circuit

60
Q

Ohmmeter reading across a good coil will indicate

a) infinite resistance
b) zero resistance
c) measurable resistance

A

c) measurable resistance

61
Q

a millivolt is expressed as

a) 1000v
b) 100v
c) 1/100v
d) 1/1000v

A

d) 1/1000v

62
Q

14-2 wire contains :

A

1-black, 1-white, 1-bare, 14 AWG conductors

G3 Exam Prep (5 decks)

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