Basic Electricity For Gas Fired Equipment

Front 1

The electrical service supplied to a Building is measured in what units?

Back 1

Amperes

Front 2

An electrical distribution system consists of what five things?

Back 2

1- an electric meter

2- a main switch or breaker

3- a distribution panel

4- fuses or circuit breakers

5- wire conductors

Front 3

What device would protect users of electrical equipment from shock hazards in damp conditions?

Back 3

A ground fault circuit interrupter (GFCI)

Front 4

Once a GFCI receptacle get tripped, can it be reset without going to the distribution panel?

Back 4

Yes

Front 5

“Permanently joining all non-current-carrying metal parts to ensure electrical continuity” is a partial definition of?

Back 5

Bonding

Front 6

What size conductor is required to bond gas piping systems to the buildings electrical system grounding conductor?

Back 6

#6 AWG (or larger) copper

Front 7

The two most common devices for the protection of electrical systems are what?

Back 7

1- fuses

2- circuit breakers

Front 8

Where would maximum ampacity values for over current protection devices be specified?

Back 8

Canadian electric code, part 1

Front 9

Two situations that cause overcurrent are?

Back 9

1- a surge in current when a motor starts up

2- a short circuit

Front 10

An electrical overload happens very quickly. True or false?

Back 10

False

Front 11

What advantage does a circuit breaker have over a fuse?

Back 11

It can be reset instead of having to be replaced.

Front 12

What is the most common electrical conductor?

Back 12

Wire

Front 13

The two basic types of wire are?

Back 13

Solid wire and stranded wire

Front 14

The maximum current rating of a #10 AWG conductor is less then that of a #14 AWG conductor. True or false?

Back 14

False

Front 15

Where the possibility of physical damage to a conductor exists, what must be done?

Back 15

The conductor must be adequately protected

Front 16

Electrical distribution, in a building, consists of?

Back 16

1- the device equipment

2- the branch circuits

Front 17

Low-voltage circuits operated at what voltage?

Back 17

31V to 750V, inclusive

Front 18

What type of armoured cable should be used for installations subject to adverse service conditions?

Back 18

Teck

Front 19

What is the purpose of ladder and schematic diagrams?

Back 19

To show how circuits work and the function of their components

Front 20

How are components represented on connection diagrams?

Back 20

By symbols

Front 21

Gas technicians should have a thorough understanding of electrical symbols. True or false?

Back 21

True

Front 22

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

Back 22

A schematic diagram

Front 23

What type of diagram is most helpful when trying to trace wires?

Back 23

A wiring diagram

Front 24

In which position will the switch’s and other devices in a circuit be shown in if a wiring diagram is drawn in the “at rest” state?

Back 24

In their normal positions (normally-open or normally-closed, depending on their function)

Front 25

In which position will the switch’s and other devices in a circuit be shown in if a wiring diagram is drawn in the “at rest” state?

Back 25

In their normal positions (normally-open or normally-closed, depending on their function)

Front 26

All control valves open and close in response to changes in what?

Back 26

Temperature, pressure, humidity and fluid flow

Front 27

A multimeter incorporates which basic electrical meters?

Back 27

1- voltmeter and millivoltmeter

2- ammeter

3- ohmmeter

Front 28

An ammeter is connected in parallel with the circuit under test. True or false?

Back 28

False

Front 29

A continuity check is actually a measurement of what?

Back 29

Resistance

Front 30

A continuity check is actually a measurement of what?

Back 30

Resistance

Front 31

An ohmmeter should always be connected to a live circuit. True or false?

Back 31

False

Front 32

A continuity check is actually a measurement of what?

Back 32

Resistance

Front 33

An ohmmeter should always be connected to a live circuit. True or false?

Back 33

False

Front 34

Is it advisable to test a fan circuit with a multimeter?

Back 34

Yes

Front 35

How many wires are contained in a service conductor to a residential distribution panel and what are they?

Back 35

1- four

2- two hot wires, one neutral and one ground wire

Front 36

Where do branch circuits start?

Back 36

At the distribution panel

Front 37

Where do branch circuits start?

Back 37

At the distribution panel

Front 38

All line voltage circuits have a continuous ground from the distribution panel to where?

Back 38

Each junction box, receptacle and appliance

Front 39

How are transformers rated?

Back 39

By the amount of power the secondary winding can handle

Front 40

How are transformers rated?

Back 40

By the amount of power the secondary winding can handle

Front 41

All electrical connections shall be made where?

Back 41

In outlet or junction boxes

Front 42

Bonding conductors must be soldered. True or false?

Back 42

False

Front 43

Switches are always located in the hot leg of a circuit. True or false?

Back 43

True

Front 44

Switch’s must be in what position to conduct electrical current?

Back 44

Closed

Front 45

Switch’s must be in what position to conduct electrical current?

Back 45

Closed

Front 46

Switch’s are operated by hand or by?

Back 46

1- changes in pressure

2- changes in fluid flow

3- changes in temperature

Front 47

Switch’s must be in what position to conduct electrical current?

Back 47

Closed

Front 48

Switch’s are operated by hand or by?

Back 48

1- changes in pressure

2- changes in fluid flow

3- changes in temperature

Front 49

Despite their similarity in outward appearance to the contacts in a light switch, how are the contacts in a toggle motor starter different?

Back 49

The contacts in a toggle motor-starter are horsepower rated and the contacts in a light switch are rated for the amount of current they can handle.

Front 50

Relays are magnetically operated to which principle?

Back 50

The solenoid principle

Front 51

Control relays are best suited for controlling single-phase pumps of any size. True of false?

Back 51

False

Front 52

How does a contactor differ from a relay?

Back 52

A contactor has large-load contacts so it could handle large amounts of current

Front 53

What is meant by the term “gangable box”?

Back 53

Several boxes may be joined or “ganged” together

Front 54

List some common fasteners used for securing electrical cable and conduit.

Back 54

Staples, clamps, cleats, sleeves, straps and grommets

Front 55

The point at which two to similar metals are joined on a thermocouple is known as what?

Back 55

The hot junction

Front 56

Thermocouples are used with which type of pilot?

Back 56

A constant (standing) pilot

Front 57

What does a thermocouple power when it I being heated?

Back 57

The electromagnet in the safety shut-off or safety switch.

Front 58

What does a thermocouple power when it I being heated?

Back 58

The electromagnet in the safety shut-off or safety switch.

Front 59

Approximately how many thermocouples does a power pile contain and how are they connected?

Back 59

10 to 30, connected in series

Front 60

What portion of the hot junction should be heated by the pilot flame and what should the temperature difference be between the hot and cold junctions?

Back 60

1- the first 0.375 to 0.5 inches of the tip

2- at least 400f (204c)

Front 61

What are powerpiles with outputs of 250 to 750 mv able to power?

Back 61

An appliance combustion safety circuit and its control circuit

Front 62

Upon inspection, the pilot flame of a powerpile-equipped appliance is observed to be blue in colour, burning steadily and contacting the top .5 inch of the powerpile tip. Is this acceptable?

Back 62

Yes

Front 63

Three things that can cause a small, blue pilot flame?

Back 63

1- a small or restricted orifice

2- low gas pressure

3- a clogged pilot filter

Front 64

Is an external power source required for a control circuit operating on a thermopile millivoltage?

Back 64

No

Front 65

What type of current do thermocouples and thermopiles produce?

Back 65

DC current

Front 66

Ha type of test is preformed to check the polarity of a millivolt meter?

Back 66

A flash test

Front 67

Ha type of test is preformed to check the polarity of a millivolt meter?

Back 67

A flash test

Front 68

A thermocouple must be under load to preform an open circuit test. True or false?

Back 68

False

Front 69

What does a closed-circuit test show?

Back 69

Millivoltage that can be maintained under load

Front 70

During the pilotstat coil test, at what point and at what mv reading should the coil drop out?

Back 70

- within 90 seconds

- between 2 mv and 5 mv

Front 71

Excessive millivolt drop indicates excessive resistance. what is the cause of the resistance?

Back 71

Loose wire connections, poor wire splices, excessive wire run length, corroded terminals and connecters

Front 72

The three available thermal pile outputs are?

Back 72

250 mV, 500 mV and 50 mV

Front 73

A 750 mV powerpile should be used when?

Back 73

When there is a need to power two circuits

Front 74

Testing a 750 mV circuit is essentially the same as testing a 500 mV circuit, except for what?

Back 74

The steps for testing the pilotstat coil

Front 75

The voltage rating of a Milli volt thermostat is?

Back 75

0 to1.5 V DC

Front 76

Total electrical resistance in the system includes the heat anticipator in the thermostat. true or false?

Back 76

True

Front 77

Name three components of a self powered heating control system.

Back 77

A- pilot burner B- thermal pile C- diaphragm gas valve D- limit switch E- Milli volt thermostat F wire runs for connecting the devices in the system

Front 78

The manufacturer recommends maximum lengths of wiring runs for self-powered control systems. true or false?

Back 78

True