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A Gasfitter > Controls > Flashcards

Controls Flashcards

1
Q

The material called Globar has a maximum temp rating of?

A

2600f(1425c)

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2
Q

Gauge of wire for pilot ground?

A

14 gauge

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3
Q

What temp should a rectifying photocell not go over?

A

165f (84c)

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4
Q

What do you call where hot and turbulent air, steam, smoke, or fuel spray in the combustion chamber can reflect or bend the infrared radiation being emitted form the refractory?

A

Shimmer

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5
Q

Max temp for UV is?

A

200f (93c)

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6
Q

Supply to a high temp O2 sensor is ____, and the out put is ____.

A

24 VDC AND 4-20 mA

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7
Q

What type of control is a t stat?

A

Operating control

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8
Q

Flame rectification relies on flame _____.

A

Conductivity

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9
Q

The flame scanner that detects light wavelengths that are located in the last 1/3 of the flame envelope is/are?

A

IR

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10
Q

Older HSI’s were constructed of_____

A

Silicon carbide

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11
Q

HSI’s can be 24 v or 120 v?
True or false

A

True

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12
Q

On a oxygen trim control the glue has sensor used to continuously ajust(___) _____/_____.

A

(Trim) the air/fuel ratio

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13
Q

What devices are used to ensure the proper integration of control sequencing?

A

Interlocks

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14
Q

All burners that exceed________ must have a low fire ignition.

A

1000 MBH

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15
Q

The two basic functions of a valve train are?

A
  1. To provide fuel safely to combustion
  2. Maximize fuel efficiency
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16
Q

What is a PLC?

A

Programming logic controller

17
Q

What is SCADA?

A

Supervisory control and data acquisition.

18
Q

The voltage produced by a thermo-electric device is Dependent on what?

A

Temp difference between hot & cold junction

19
Q

The ____ pressure switch is located _________ from the SSOV. With the set point at the normally _______ position. Adjusted To open when the gas pressure drops __% of the normal operating presure

A

Low
Upstream
Closed
50%

20
Q

The ____ presure switch is locate ________ of SSOV and is adjusted to normally ________. Switch will open when the pressure goes higher than ____%

A

High
Closed
125%

A Gasfitter (3 decks)

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