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Plumbing Year 4 > Electrical wiring and Diagrams > Flashcards

Electrical wiring and Diagrams Flashcards

1
Q

A circuit that only has one path for current to flow, it is defined as a/an;

A

Series circuit

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2
Q

In a series circuit, the total opposition to the current flow (RT) is;

A

Equal to the sum of each of the resistances

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3
Q

The sum of all voltages in a closed circuit is zero describes;

A

Kirchhoff’s Law

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4
Q

A circuit that has more than one path for the current to flow can be described as a/an;

A

Parallel circuit

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5
Q

In which section of the CEC are Class 1 and 2 circuits defined?

A

Section 16

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6
Q

What is the maximum VA rating for Class 1 extra low voltage power circuits?

A

1000 VA

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7
Q

The maximum power output of a Class 2 circuit supply must be restricted to

A

100 VA

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8
Q

The voltage of Class 2 circuit must be 150 V or less.

T or F

A

true

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9
Q

What is the maximum allowable current that a 24 V Class 2 circuit?

A

4.16 A

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10
Q

According the CEC, a gas-fired appliance can be part of a combined branch circuit.

T or F

A

False

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11
Q

If a transformer has a secondary voltage of less than 50 V and the primary voltage is 150 volts-to-ground or less, is grounding required?

A

No

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12
Q

What is the minimum distance required between a switch and a gas meter or relief device?

A

3 feet

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13
Q

A disconnect must be placed within _____________ and within sight of the rooftop mechanical equipment it serves.

A

10 feet

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14
Q

You can use ELC for wiring a 24 V thermostat circuit

A

False

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15
Q

As a rule, where should controlling devices which sense changes in conditions, be shown on a schematic diagram?

A

Left Side

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16
Q

Devices should be shown in the following manner on a schematic diagram with the exception of;

A

Power on

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17
Q

Which diagram would show the relative physical location of components?

A

Wiring

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18
Q

Which diagram shows controls using scale drawings or pictures?

A

Pictorial

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19
Q

What is another name for a connection diagram?

A

Line

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20
Q

With direct reference to wiring diagrams, where would a technician find information regarding the symbols used for factory and field wiring, as well as the colour and voltage of the wire?

A

Legend

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21
Q

Which portion the manufacturer’s literature would provide a very simple step by step walk through of how a device is supposed to operate?

A

Flow chart

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22
Q

Which drawing allows you to analyze the power flow of an electrical circuit and shows you how a circuit works and how its components are coordinated to work with each other?

A

Ladder

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23
Q

There are standards for wiring symbols which each manufacturer must adhere to for the sake of uniformity across the industry.

T or F

A

False

24
Q

In solid state devices, relays are replaced by;

A

Triacs or Transistors

25
Q

What force is utilized to open a diaphragm gas valve?

A

Working gas pressure

26
Q

A solenoid gas valve has the ability to modulate gas flow.

T or F

A

False

27
Q

What gas appliance typically utilizes the “Rod and Tube” control principle?

A

Residential hot water tank

28
Q

An aquastat is considered;

A

A normally closed control & An operating control

29
Q

Solid-state controls are quicker response time, less space and less servicing (no moving parts).

T or F

A

True

30
Q

From the list, which of the items would be considered false with regards to solid-state devices?

no moving part

are able to withstand power surges

require less maintenance

Take up less space

A

Are able to withstand power surges

31
Q

What term describes a device that converts AC current to DC current?

A

Rectifier

32
Q

Thermistors are sensing devices that react to;

A

Temperature

33
Q

If an RTD (resistance temperature detector) has a positive temperature coefficient;

A

An increase in temperature results in an increase in resistance

34
Q

What are the two most important tools when troubleshooting?

A

Wiring diagram & Multi-meter

35
Q

When you are troubleshooting electronic systems, what component should be your initial primary focus?

A

Solid state control board

36
Q

At no time should you try to troubleshoot the individual components on the board or module.

T or F

A

True

37
Q

With an electronic control board readout, you should be able to troubleshoot problems by using;

A

Wiring diagrams & Manufacturer’s troubleshooting charts

38
Q

Flame Spectrum could be defined as:

A

The band of electromagnetic radiation emitted from a flame

39
Q

The total infrared radiation produced from a burner flame would be about:

A

90%

40
Q

Ultraviolet radiation is emitted from the _______________ of the flame.

A

1st third

41
Q

The only flame detector that is affected by ignition interference is:

A

Flame rod

42
Q

The pilot turndown test is required on which the following flame detectors?

UV
IR
Visible
Flame rod
All of the above

A

all of the above

43
Q

Safe operation of the flame safeguard detection system is the responsibility of:

A

The person activating the appliance

44
Q

schematic diagram is also known as a _____________________.

A

Ladder diagram

45
Q

What is the purpose of ladder and schematic diagrams?

A

To show how circuits work and the function of their components

46
Q

How are components represented on connection diagrams?

A

Simple pictorials

47
Q

The sequence of operation of a circuit can be determined from what kind of drawing?

A

Schematic diagram

48
Q

In which operating position will the switches and other devices in a circuit be shown on a wiring diagram drawn in the “at rest” state?

A

Normal position

49
Q

A__________ diagram can be divided into two distinct portions. The top is the power portion and the bottom is the control portion

A

Ladder diagram

50
Q

A schematic diagram shows the electrical relationship between components in a circuit, while a wiring diagram shows how components are actually wired.

T or F

A

True

51
Q

On a ladder diagram the source/hot line is drawn on the right.

T or F

A

false

52
Q

How is the field wiring identified on a wiring schematic?

A

Dotted lines

53
Q

The left-hand side of the ladder diagram represents the incoming voltage.

T or F

A

true

54
Q

Which electrical drawing would be considered a map of an electrical circuit?

A

Wiring diagram

55
Q

Which electrical drawing is best used to determine how current flows through the various parts of the circuit?

A

Schematic diagram

56
Q
A

Plumbing Year 4 (28 decks)

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