Electrical wiring and Diagrams

Question 1

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

Answer 1

Series circuit

Question 2

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

Answer 2

Equal to the sum of each of the resistances

Question 3

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

Answer 3

Kirchhoff’s Law

Question 4

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

Answer 4

Parallel circuit

Question 5

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

Answer 5

Section 16

Question 6

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

Answer 6

1000 VA

Question 7

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

Answer 7

100 VA

Question 8

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

T or F

Answer 8

true

Question 9

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

Answer 9

4.16 A

Question 10

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

T or F

Answer 10

False

Question 11

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?

Answer 11

No

Question 12

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

Answer 12

3 feet

Question 13

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

Answer 13

10 feet

Question 14

You can use ELC for wiring a 24 V thermostat circuit

Answer 14

False

Question 15

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

Answer 15

Left Side

Question 16

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

Answer 16

Power on

Question 17

Which diagram would show the relative physical location of components?

Answer 17

Wiring

Question 18

Which diagram shows controls using scale drawings or pictures?

Answer 18

Pictorial

Question 19

What is another name for a connection diagram?

Answer 19

Line

Question 20

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?

Answer 20

Legend

Question 21

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

Answer 21

Flow chart

Question 22

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?

Answer 22

Ladder

Question 23

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

T or F

Answer 23

False

Question 24

In solid state devices, relays are replaced by;

Answer 24

Triacs or Transistors

Question 25

What force is utilized to open a diaphragm gas valve?

Answer 25

Working gas pressure

Question 26

A solenoid gas valve has the ability to modulate gas flow. T or F

Answer 26

False

Question 27

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

Answer 27

Residential hot water tank

Question 28

An aquastat is considered;

Answer 28

A normally closed control & An operating control

Question 29

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

Answer 29

True

Question 30

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

Answer 30

Are able to withstand power surges

Question 31

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

Answer 31

Rectifier

Question 32

Thermistors are sensing devices that react to;

Answer 32

Temperature

Question 33

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

Answer 33

An increase in temperature results in an increase in resistance

Question 34

What are the two most important tools when troubleshooting?

Answer 34

Wiring diagram & Multi-meter

Question 35

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

Answer 35

Solid state control board

Question 36

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

Answer 36

True

Question 37

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

Answer 37

Wiring diagrams & Manufacturer’s troubleshooting charts

Question 38

Flame Spectrum could be defined as:

Answer 38

The band of electromagnetic radiation emitted from a flame

Question 39

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

Answer 39

90%

Question 40

Ultraviolet radiation is emitted from the _______________ of the flame.

Answer 40

1st third

Question 41

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

Answer 41

Flame rod

Question 42

The pilot turndown test is required on which the following flame detectors? UV IR Visible Flame rod All of the above

Answer 42

all of the above

Question 43

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

Answer 43

The person activating the appliance

Question 44

schematic diagram is also known as a _____________________.

Answer 44

Ladder diagram

Question 45

What is the purpose of ladder and schematic diagrams?

Answer 45

To show how circuits work and the function of their components

Question 46

How are components represented on connection diagrams?

Answer 46

Simple pictorials

Question 47

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

Answer 47

Schematic diagram

Question 48

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?

Answer 48

Normal position

Question 49

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

Answer 49

Ladder diagram

Question 50

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

Answer 50

True

Question 51

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

Answer 51

false

Question 52

How is the field wiring identified on a wiring schematic?

Answer 52

Dotted lines

Question 53

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

Answer 53

true

Question 54

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

Answer 54

Wiring diagram

Question 55

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

Answer 55

Schematic diagram