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Gas Level 3 HBA > Electrical Questions Test > Flashcards

Electrical Questions Test Flashcards

1
Q

WHat does EMF stand for in electrical

A

Electromotive force
Is used to indicate electrical pressure or voltage.

“Potential difference”

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2
Q

What does A.C stand for?

A

Alternating Current

A.C is not constant, it going from negative to positive in a sine wave

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3
Q

What does R.M.S stand for?

Found on a multimeter.

A

Root Means Square

Modern multimeters calculate the actual Voltage using a formula.

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4
Q

What does Current define in a electrical system?

A

Is a measurement of the rate of flow or electrons.

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5
Q

What is a ampere in an electrical system?

A

An ampere is one coulomb of electrons flowing past a given point in one second.

One coulomb is aprox.
6,280,000,000,000,000,000 or 6.28x10e18 electrons

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6
Q

What is resistance in an electrical circuit?

A

Basically “Oppostion to the flow of electrons”

All material have some resistance to the flow of electrons.

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7
Q

What four things effect resistance in an electrical circuit?

A

1 Material(Aluminum vs Copper)
Diameter( 8awg vs 6awg)
Length (25’ vs 50’)
Temperature (60Celsuis vs 75 celsuis)

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8
Q

You connect an ammeter in ____ with the load?

Series/Parallel

A

Series

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9
Q

You connect a Voltmeter in____ across the load

Series/Parallel

A

Parallel

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10
Q

In a series circuit, how does resistance act?

A

Total resistance is added together.
(r1+r2+r3=RT)

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11
Q

In a series circuit, how does Amperage behave across each load?

A

The amperage is constant througout a series circuit.
i1=i2=iT

i = Amperage

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12
Q

In a series circuit, how does Voltage behave across each load?

A

The total voltage is equal to all the voltage drops across each load.
ET=E1+E2+E3

E=Voltage

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13
Q

In a parallel circuit, how does Resistance act?

A

Total resistance is less then the lowest sum in the circuit.
{1/(1/R1+1/R2+1/R3)=Rt}**

**Formula for findin resistance in parallel circuit

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14
Q

How does Voltage behave in a parallel circuit?

A

Voltage is constant across each load.
(Et=E1=E2)

Et= voltage total/Total Voltage

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15
Q

In relation to a parallel circuit, how will amperage act?

A

The Current total is all individual loads added together.
(I1+I2=It)

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16
Q

In a series circuit, if one component fails, what happens to the rest of the circuit?

A

The entire circuit stops working

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17
Q

If you add more resistors to a series circuit, the total resistance will:

A

Increase

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18
Q

In a series circuit, if the total voltage is 12V and there are three equal resistors, what is the voltage drop across each resistor?

A

4V

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19
Q

When calculating the total resistance in a series circuit, you should

A

Add them together

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20
Q

In a series circuit, the sum of the individual voltage drops across each resistor is?

A

Equal to the total voltage

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21
Q

If the current through a series circuit is 2A, and the resistance is increased, the current will

A

Decrease

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22
Q

In a series circuit with different resistors, the resistor with the highest resistance will have the_ _ _ _ _ Voltage Drop

A

Highest

23
Q

In a parallel circuit, if one branch is opened or disconnected, what happens to the other branches?

A
24
Q

The electrical service supplied to a building is measured in?

A

Watts

Watts=Power, Power=Watts

25
Q

Homes which are heated by electricity require what size of service?

Amps

A

200Amps

26
Q

Which gauge of wire is normally used for residential lighting and receptacles?

A

14/2 AWG

27
Q

The GFCI will trip when it senses what change of current flow?

A

0.005 Amps

28
Q

What size of grounding/bonding wire is used?

A

6 AWG

29
Q

The voltage sine wave of a three-phase wire system is out of phase with each other by_ _ _ _ Degrees

A

120

360 Deg. divided in 3 = 120 degrees

30
Q

Failure of a conductor’s insulation, causing the conductor to touch casing and create line-to-ground, is called a?

A

Short Circuit

You SHORT the CIRCUIT by going back to the source.

31
Q

A current surge when a motor starts up is called

A

An Overcurrent

Motor pulling to many amp very quickly

32
Q

The use of worn out or seized bearings in electrical equipment could cause

A

Overload

Pulling to many amps for far to long.

33
Q

What color is a fuse rated for up to 15 Amps?

A

Blue

34
Q

What color is a fuse rated for up to 20 Amps?

A

Red

35
Q

What color is a fuse rated for up to 30 Amps?

A

Green

36
Q

What is the maximum voltage considered to be a low voltage system?

When compared to power lines!

A

750V

37
Q

The ability of a material to be drawn into wire form is called:

A

Ductility

38
Q

When taking a voltage reading, how should the meter be connected?

A

In parallel with the load being checked.

39
Q

A basic multimeter incorporates which electrical meters?

A

Voltmeter, Ammeter, Ohmmeter

40
Q

What is the power rating of a secondary stage in a transformer if it has 24 volts and 10 amps?

A

240W
P=V*A

41
Q

How many wires are contained in a service conductor to a residential panel?

From the road to the main breaker panel

A

2 Hot, 1 Neutral, 1 Ground

42
Q

How are transformers rated?

A

Volt-Amps (VA)

43
Q

The electrical code requires all electrical connections be

Where do you make a connection or ‘pig-tail’

A

Made in a junction or outlet box

44
Q

Switches are located in which leg of the circuit?

A

Hot,
You want to interupt power going into the equipment.

Dangerous to do on the Neutral!!!!

45
Q

Thermocouples generate DC voltage in which range?

A

0-30mV

46
Q

When the pilot fails, the thermocouple must cool down and de-energize the safety shut-off valve or safety switch within:

A

180 seconds

47
Q

Thermocouples are only approved for gas appliances with inputs up to and including:

How many Btu/H

A

400,000 Btu/H

48
Q

A thermocouple only generates a voltage if the temperature difference between the hot and cold junctions is at least?

A

400°F

49
Q

The pilot flame should only heat the first

How much should the flame cover in inches.

A

1/2”

50
Q

Thermopiles generate a DC voltage of?

A

250mV-750mV

51
Q

What is one non-desirable characteristic of a normal pilot flame?

A

A Hard, Sharp flame

52
Q

The thermocouple should be replaced when a open test reading of what occurs?

A

0-15mV

53
Q
A

Gas Level 3 HBA (6 decks)

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