Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Line A > Line A ALL > Flashcards

Line A ALL Flashcards

1
Q
A
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

What is the main reason for performing combustion analysis on gas fired equipment?

A

To ensure the equipment is operating in a safe and efficient manner.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

How often should your combustion analyser be calibrated to ensure accurate test readings?

A

Once per year.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Where should the sampling probe take a sample from on a gas fired appliance?

A

Upstream of any draft control device or just downstream of a stack economizer.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What is the correct way to allow combustion analysis samples to be taken with plastic S636 systems?

A

Installing an access tee with a ½” tapped bushing as close as possible to the flue collar of the appliance where either a plastic or brass plug can be inserted.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

What is a Peltier cooler used for in a combustion analyzer?

A

To drive out moisture from the sample

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

The gas cells in a combustion analyser are of what type?

A

Electrochemical

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

What can shorten the life span of the toxic sensors in a combustion analyser?

A

High gas concentrations or insufficient purging

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

What is the chemical formula for the Perfect combustion of Natural Gas?

A

1CO2 + 2H2O = 8N2

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

What is the chemical formula for the Perfect combustion of Propane?

A

3C02 + 4H2O = 20N2

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

What is added to the combustion process to produce Complete combustion?

A

Excess Air

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

What is the expected percentage range of O2 produced by a forced draft burner with CH4 as the fuel?

A

3% - 6%

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

What are four characteristics of Carbon Monoxide?

A

Toxic, colourless, odourless and tasteless

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

What can cause too much draft in a venting system?

A

High stack temperatures

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

What percentage gain in efficiency is achieved by lowering stack temperature by 45⁰F?

A

Less than 1%

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Calculate the net stack temperature if the ambient temperature is 72⁰F and the stack temperature is 420⁰F? Is this temperature within typically expected values?

A

348⁰F, Yes (330 - 500⁰F)

17
Q

If the measure percent O2 reading is 4.1% and the measured NOx reading is 55 ppm, what would the NOx ppm be when corrected to standard?

A

58.58 ppm

18
Q

If the measured CO reading is 38 ppm, and the measured %O2 reading is 4.2% what would the calculated air-free ppm reading be?

A

47.56 ppm

19
Q

What is the power end of the Honeywell, Series 90 Modutrol used for?

A

It is used to drive linkages

20
Q

What is the auxiliary end of the Honeywell, Series 90 Modutrol used for?

A

It is used to devices like auxiliary switches

21
Q

In what orientation should motors with crankshafts be installed?

A

Horizontal

22
Q

How is strain avoided on the motor and linkage of a fuel/air system?

A

The drive lever rotational start point is kept off of the shaft centerline

23
Q

Fixed Stroke Actuators are available in what two opening ranges?

A

90⁰ or 160⁰

24
Q

Adjustable stroke model actuators can be field adjusted between what range?

A

90⁰ - 160⁰

25
Q

What controls the speed and the amount of rotation of the driven lever pivot point?

A

It is controlled by the starting position of both levers and the connection distance of the linkage to the lever pivot points

26
Q

Placing the drive lever closer to the shaft centerline than the driven lever is placed will do what to the rotation of the driven lever?

A

It will be reduced

27
Q

Placing the driven lever closer to the shaft centerline than the driver lever is placed will do what to the rotation of the driven lever?

A

It will be increased

28
Q

How are precise changes made on the linkage for a fuel valve?

A

By adjusting the cam spring

29
Q

The gas butterfly valve is used to control modulation and to stop gas flow?
TRUE / FALSE

A

FALSE, It is not used to stop gas flow

30
Q

How can high and low fire be adjusted on a gas butterfly valve?

A

By using the stop screws

31
Q

Where would you find information for making initial set up adjustments to linkages?

A

From the equipment manufacturer

32
Q

What must be done while making any adjustments to linkages?

A

Combustion analysis must be performed

33
Q

How do we balance safety and efficiency when adjusting our linkages with the use of a combustion analyzer?

A
  • Adding more oxygen reduces the chance of CO and increases safety
  • Reducing oxygen increases our efficiency but has the potential to increase CO thus being less safe.
  • Always prioritize safety

Line A (3 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions