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A fitting Paige > Electrical > Flashcards

Electrical Flashcards

1
Q

How are the limits powered

A

Series

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2
Q

What is the percent of air in a low fire start

A

40 percent or less of rated max input

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3
Q

What BTU needs a low fire start provin

A

1,000,000 BTU

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4
Q

What do parallel position systems use

A

Potentiometer

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5
Q

Can you adjust the over travel proof of travel switch

A

No it is factory set

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6
Q

What are the common terminals on a 24 V transformer

A

C and R

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7
Q

What is an isolation transformer

A

Has two isolated circuits
Number of wraps decides voltages
Help removed electrical noise

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8
Q

What amount can the inrush be more than the steady VA

A

3-10 times
Can last 30-50 milliseconds

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9
Q

Inrush Va equation

A

whole equation square rooted
total inrush squared multiplied by total sealed squared

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10
Q

What is the typical sparker gap

A

1/8 - 5/32

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11
Q

What happens if the sparker gap is wrong

A

Wont light
Or shortens life of the sparker coil

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12
Q

How many ignition electrodes does the oil need

A

2

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13
Q

Auto transformers

A

Use same windings for primary and secondary
Enable start in squirrel cage motors
Uses reduced starting current

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14
Q

Metel ranges for RTD

A

Copper - 200-260
Nickle - 90 to 260
Platinum - 200-850

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15
Q

3 different ways RTD wiring is done

A

Wire round
Coil element
Thin film RTD

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16
Q

How is wire round set to 0 degrees

A

Wire is trimmed

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17
Q

Is Wire round recommended for industrail?

A

No it is accurate but fragile

18
Q

Properties of wire round RTD

A

Has a wire round a non conductive materials

19
Q

Properties of coil element RTD

A

Wires rolled into small coils then but loosely at the end with powder
Free to expand
powder increases rate of heat
Most common in industrial

20
Q

Properties of thin film RTD

A

Cheapest
Fastest response time
Thin platinum pathways in ceramic base
Not as accurate because it can self heat

21
Q

When would you use a two wire sensor

A

When accuracy is not critical

22
Q

What does a pressure transducer do

A

Coverts pressure into an electrical signal

23
Q

What do biomass and O2 sensors do

A

Monitors unused gas and adjusts fuel gas mixture accordingly

24
Q

What is a device connected to a network called

A

Node

25
Q

What is a gateway

A

Adds an access point between 2 networks

26
Q

How to determine full load amps

A

Get FLA off name plate
multiply bu 1.25
use table 37 and 75 degrees

27
Q

Size magnetic starter

A

Find HP on rating plate
Use Nema sizing chart for controller size
Must be more or equal to FLA

28
Q

Size starter overload

A

Find full load current (amps) and service factor
If 1.5 use 125% if less use 115% (multiply by it)

29
Q

Size disconnect fuses

A

Table 29 (Usually 175%)
FLC amps multiplied by number determined above

30
Q

How to size wires
(to branch circuit, disconnect, overload, fuses)

A

Use table 2 to size wire

31
Q

What is a wire

A

Single conductor

32
Q

What is a cable

A

Group of wires in an insulated conductor

33
Q

Standard vs solid

A

Standard is more flexible
Solid is less resistant

34
Q

What is a mag starter

A

Electrical switch that is a safe way to start the motor

35
Q

What is the Proportional in a PID

A

How fast you get to set point

36
Q

What is the integral in a PID

A

Uses previous data to put on the brakes or speed it up

37
Q

What is the derivative in a PID

A

Stores the information for future
(Not used on a burner)

38
Q

3 types of parameters for a VFD

A

Tunable on the fly- Can be adjusted when running
Configurable- only adjustable when unit is off
Read only- Cannot be adjusted

39
Q

What does an ECC do

A

Transfers torque between two shafts without touching
Magnet on the drive
Non magnetic on the driven (Coupling)

40
Q
A

A fitting Paige (13 decks)

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