Electrical

Question 1

How are the limits powered

Answer 1

Series

Question 2

What is the percent of air in a low fire start

Answer 2

40 percent or less of rated max input

Question 3

What BTU needs a low fire start provin

Answer 3

1,000,000 BTU

Question 4

What do parallel position systems use

Answer 4

Potentiometer

Question 5

Can you adjust the over travel proof of travel switch

Answer 5

No it is factory set

Question 6

What are the common terminals on a 24 V transformer

Answer 6

C and R

Question 7

What is an isolation transformer

Answer 7

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

Question 8

What amount can the inrush be more than the steady VA

Answer 8

3-10 times
Can last 30-50 milliseconds

Question 9

Inrush Va equation

Answer 9

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

Question 10

What is the typical sparker gap

Answer 10

1/8 - 5/32

Question 11

What happens if the sparker gap is wrong

Answer 11

Wont light
Or shortens life of the sparker coil

Question 12

How many ignition electrodes does the oil need

Answer 12

2

Question 13

Auto transformers

Answer 13

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

Question 14

Metel ranges for RTD

Answer 14

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

Question 15

3 different ways RTD wiring is done

Answer 15

Wire round
Coil element
Thin film RTD

Question 16

How is wire round set to 0 degrees

Answer 16

Wire is trimmed

Question 17

Is Wire round recommended for industrail?

Answer 17

No it is accurate but fragile

Question 18

Properties of wire round RTD

Answer 18

Has a wire round a non conductive materials

Question 19

Properties of coil element RTD

Answer 19

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

Question 20

Properties of thin film RTD

Answer 20

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

Question 21

When would you use a two wire sensor

Answer 21

When accuracy is not critical

Question 22

What does a pressure transducer do

Answer 22

Coverts pressure into an electrical signal

Question 23

What do biomass and O2 sensors do

Answer 23

Monitors unused gas and adjusts fuel gas mixture accordingly

Question 24

What is a device connected to a network called

Answer 24

Node

Question 25

What is a gateway

Answer 25

Adds an access point between 2 networks

Question 26

How to determine full load amps

Answer 26

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

Question 27

Size magnetic starter

Answer 27

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

Question 28

Size starter overload

Answer 28

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

Question 29

Size disconnect fuses

Answer 29

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

Question 30

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

Answer 30

Use table 2 to size wire

Question 31

What is a wire

Answer 31

Single conductor

Question 32

What is a cable

Answer 32

Group of wires in an insulated conductor

Question 33

Standard vs solid

Answer 33

Standard is more flexible Solid is less resistant

Question 34

What is a mag starter

Answer 34

Electrical switch that is a safe way to start the motor

Question 35

What is the Proportional in a PID

Answer 35

How fast you get to set point

Question 36

What is the integral in a PID

Answer 36

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

Question 37

What is the derivative in a PID

Answer 37

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

Question 38

3 types of parameters for a VFD

Answer 38

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

Question 39

What does an ECC do

Answer 39

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