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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’s 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 finding 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

22
Q

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

23
Q

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

A

They will continue to work

24
Q

The electrical service supplied to a building is measured in?

A

Watts

Watts=Power, Power=Watts

25
Homes which are heated by electricity require what size of service? | Amps
200Amps
26
Which gauge of wire is normally used for residential lighting and receptacles?
14/2 AWG
27
The GFCI will trip when it senses what change of current flow?
0.005 Amps
28
What size of grounding/bonding wire is used?
6 AWG
29
The voltage sine wave of a three-phase wire system is out of phase with each other by_ _ _ _ Degrees
120 | 360 Deg. divided in 3 = 120 degrees
30
Failure of a conductor's insulation, causing the conductor to touch casing and create line-to-ground, is called a?
Short Circuit | You SHORT the CIRCUIT by going back to the source.
31
A current surge when a motor starts up is called
An Overcurrent | Motor pulling to many amp very quickly
32
The use of worn out or seized bearings in electrical equipment could cause
Overload | Pulling to many amps for far to long.
33
What color is a fuse rated for up to 15 Amps?
Blue
34
What color is a fuse rated for up to 20 Amps?
Red
35
What color is a fuse rated for up to 30 Amps?
Green
36
What is the maximum voltage considered to be a low voltage system? | When compared to power lines!
750V
37
The ability of a material to be drawn into wire form is called:
Ductility
38
When taking a voltage reading, how should the meter be connected?
In parallel with the load being checked.
39
A **basic** multimeter incorporates which electrical meters?
Voltmeter, Ammeter, Ohmmeter
40
What is the power rating of a secondary stage in a transformer if it has 24 volts and 10 amps?
240W P=V*A
41
How many wires are contained in a service conductor to a residential panel? | From the road to the main breaker panel
2 Hot, 1 Neutral, 1 Ground
42
How are transformers rated?
Volt-Amps (VA)
43
The electrical code requires all electrical connections be | Where do you make a wire connection
Made in a junction or outlet box
44
Switches are located in which leg of the circuit?
Hot, You want to interupt power going into the equipment. | Dangerous to do on the Neutral!!!!
45
Thermocouples generate DC voltage in which range?
0-30mV
46
When the pilot fails, the thermocouple must cool down and de-energize the safety shut-off valve or safety switch within:
180 seconds
47
Thermocouples are only approved for gas appliances with inputs up to and including: | How many Btu/H
400,000 Btu/H
48
A thermocouple only generates a voltage if the temperature difference between the hot and cold junctions is at least?
400°F
49
The pilot flame should only heat the first | How much should the flame cover in inches.
1/2"
50
Thermopiles generate a DC voltage of?
250mV-750mV
51
What is one non-desirable characteristic of a normal pilot flame?
A Small, Hard, Sharp flame
52
The thermocouple should be replaced when a open test reading of what occurs?
0-15mV

Gas Level 3 HBA (5 decks)

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