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burners > Atmospheric burners > Flashcards

Atmospheric burners Flashcards

1
Q

A device used to burn gas under control to provide a useful heat is called a?

A

Burner

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2
Q

select two general types of gas burners from the following options. Venturi style,Atmospheric,Mechanical, Vacuum and orifice style

A

Atmospheric and Mechanical

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3
Q

air which is drawn into the burner by the flow of a jet of low pressure gas through an orifice is refered to as

A

Primary Air

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4
Q

what is used in a bunsen burner to regulate the flow of gas

A

Orifice

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5
Q

the unburned mixture of flue gas and primary are is located in?

A

The Inner or Primary cone

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6
Q

Air supplied to around the flame is refered to as

A

Secondary Air

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7
Q

The amount of Primary Air to a gas burner is regulated by

A

The Air Shutter

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8
Q

Combustion at a gas burner takes place at the

A

Ports

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9
Q

the mixing tube of a burner is commonly know as the

A

Venturi

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10
Q

one of the factors which effects the maximum flow rate through an orifice is the

A

Size of the orifice

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11
Q

gas pressure at the manifold can be measured with a?

A

Manometer

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12
Q

when the velocity of the gas/air mixture exceeds the flame velocity, the flame will?

A

Lift

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13
Q

When the primary air is insufficient_________Flames will be observed

A

Yellow-Tipped

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14
Q

Flashback on burners can sometimes be eliminated by reducing the

A

Primary Air

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15
Q

Insufficient________air supplied to a burner enclosed in a combustion chamber will cause the flame to float

A

Secondary

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16
Q

Secondary air flow is controlled by the size of the________ openings into the combustion chamber and the_______ outlet size

A

Air inlet and Flue

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17
Q

A bed burner is when a number of atmospheric burners are combined to form a single unit? T/F

A

True

18
Q

name all the causes for a flame to burn back into a burner head?

A

Too much primary air, Low gas pressure and to small of an orifice

19
Q

Name all the causes for flame lift?

A

Too much primary air, High gas pressure and Too large of an orifice

20
Q

The most common cause of yellow flames is an excess amount of primary air? T/F

A

False

21
Q

An atmospheric burner at sea level uses air supplied at____PSIA ( use one decimal place)

A

14.7

22
Q

A “Pilot” is a flame that is used to ignite a Gas/Air mixture at the main burners? T/F

A

True

23
Q

What may be installed or modified to reduce the effect of a strong draft against a pilot

A

Pilot Shield

24
Q

The purpose of a pilot turndown test is to make sure the pilot is in the correct location to safely light the main burner? T/F

A

True

25
Q

when the gas/air velocity exceeds the flame speed, gas pressure is to high, Too large of an orifice or too much primary air would be the cause of?

A

Flame lift off

26
Q

when the gas/air velocity is less than the flame speed, low gas pressure, too small of an orifice or too much primary air creating a lean mixture would cause?

A

FlashBack

27
Q

How many Btu’s per square inch of burner port should be allocated to an atmospetic burner and what is the term used to describe it?

A

25mbh-30mbh/ in2 Port loading

28
Q

how many BTUH should be allocated for a burner with 40 ports 1/8 of an inch in diameter (Minimum and Maximum BTUH)

A

40x(1sq over 8x.7854) x 25,000) =12,272BTUH

40x(1sq over 8x.7854) x 30,000) = 14,726BTUH

29
Q

which of the following would most likely produce the most carbon monoxide? yellow tipping,Flame lift off,Flame roll-out or Waving Flames

A

Flame Liftoff

30
Q

“Barber” burners use the_________Principle

A

Flame Retention

31
Q

Flame lift-off can be corrected by

A

Decreasing primary air

32
Q

The low pressure area in the venturi of an atmospheric burner is created by

A

the high velocity gas flow through the orifice

33
Q

Primary air would be defined as that air

A

Drawn in at the burner inlet

34
Q

which of the following condition would cause floating flames. Too much primary air, Low gas pressure,A blocked vent cap or a blocked flue outlet

A

A blocked flue outlet

35
Q

Can you adjust the primary air on a barber tip burner? Y/N

A

NO the primary air opening is fixed, no adjustment possible

36
Q

‘a pilot that burns at low turn down throughout the entire time the burner is in service,wether or not the main burner is firing, except that apon a call of heat, the fuelflow for the pilot is automatically increased to produce a flame which will reliably ignite the main burner fuel’. is a good definition of a/an?

A

Expanding Pilot

37
Q

A noisy,lifting, blowing pilot flame is usually caused by

A

High gas pressure

38
Q

a forced warm air furnace equipped with a atmospheric burner, is found to have an above normal quantity of carbon monoxide in the flue products, clocking the furnace indicates the input is incorrect, the first step to correct this problem would be

A

correct the input to the burner

39
Q

which of the following items will determin the firing rate of the atmospheric burner. the orifice size and primary air,the pressure and the correct amount of air, the orifice size and pipe size, the orifice size and pressure

A

the orifice size and pressure

40
Q

if flashback is occuring in an atmospheric burner which of the following actions maybe required. clean the burner and increase the primary air,clean the burner and decrease the gas pressure, decrease the primary air and/or increase the gas pressure, increase the primary air and/ or decrease the gas pressure

A

decrease the primary air and/or increase the gas pressure

41
Q

a flame that is waving or rolling out when the circulation fan of a furnace comes on may indicate

A

a cracked heat exchanger

42
Q

the percentage of natural gas in a gas/air mixture required at a burner to obtain maximum efficiency is approx?

A

10%

burners (2 decks)

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