Book 1 Chapter 14: Burners For Boilers

Question 1

Air that is used to vaporize the fuel for easier burning is called ______ air.
A) Secondary
B) Primary
C) Atmospheric
D) Atomizing

Answer 1

D) Atomizing

Question 2

Gas burners that are commonly found on hot water heaters are ___________.
A) Power
B) Atmospheric
C) Primary
D) Secondary

Answer 2

B) Atmospheric

Question 3

The type of pilot burner that is automatically ignited at the start of each burner operation, and continues to burn throughout the main burner “on” period is called the ___________ pilot.
A) Continuous
B) Interrupted
C) Standing
D) Intermittent

Answer 3

D) Intermittent

Question 4

A type of valve used as a shut-off valve in pilot and main burner supply lines that uses an electromagnetic coil to activate it is a ___________ valve.
A) Check
B) Globe
C) Motorized
D) Selonoid

Answer 4

D) Selonoid

Question 5

Before light oil can be burned properly it must be_________.
A) Heated
B) Pasteurized
C) Swirled
D) Atomized

Answer 5

D) Atomized

Question 6

The type of oil burner that forces the oil through a very fine nozzle port is a __________ burner.
A) Rotary cup
B) Mechanical
C) Steam atomizing
D) Centrifugal

Answer 6

B) Mechanical

Question 7

The result of an automatic gas valve opening too quickly is called a ____________
A) Light-off
B) Boiler explosion
C) Pressure explosion
D) Puff back

Answer 7

D) Puff back

Question 8

Heavy oils must be heated to approximately _________ before they can be atomized.
A) 95°C (203°F)
B) 59°C (122°F)
C) 125°C (257°F)
D) 165°C (329°F)

Answer 8

A) 95ºC (203ºF)

Question 9

An oil storage tank must be located at least ________ away from the furnace.
A) 1m (3.3ft)
B) 1.5m (4.9F)
C) 0.6m (2.0ft)
D) 3.0m (9.8ft)

Answer 9

C) 3m (9.8ft)

Question 10

The reducing of oil into very small particles is termed:
A) Fractionation
B) Turbulence
C) Atomization
D) Distillation
E) Fluidization

Answer 10

C) Atomization

Question 11

The purpose of the deflector vanes in the center of a ring (gas) burner is to:
A) Increase the gas velocity
B) Increase the temperature of the furnace
C) Promote turbulence of gas and air mixture
D) Decrease the air velocity
E) Atomize the gas particles

Answer 11

C) Promote the turbulence of gas and air mixture

Question 12

Oil burners can be divided into three classes:
1. Air and steam atomizing burners
2. Mechanical or pressure atomizing burners
3. Centrifugal or rotary cup burners
4. Atmospheric pressure burners
5. Gravitational pressure burners

A) 1,2,4
B) 2,3,5
C) 1,2,3
D) 3,4,5
E) 2,3,4

Answer 12

C) 1,2,3

Question 13

A three-nozzle burner has secondary and tertiary nozzles ignited by the:
A) Interrupted pilot
B) Primary burner
C) Continuous pilot
D) Intermittent pilot flame
E) Igniter spark

Answer 13

B) Primary burner

Question 14

A very popular packaged boiler gas burner is the:
A) Mechanical atomizing burner
B) Post mix atmospheric burner
C) Cluster nozzle burner
D) Ring burner
E) Non-articulated burner

Answer 14

D) Ring burner

Question 15

The ________ pilot is most often used on a small boiler.
A) Intermittent
B) Interrupted
C) Continuous
D) Automatic
E) Manual

Answer 15

C) Continuous

Question 16

A refractory burner disadvantage is its:
A) Low radiant heat
B) Excessive preheat
C) Tendency to overheat
D) High initial cost
E) Low combustion efficiency

Answer 16

D) High initial cost

Question 17

Gas burners for heating boilers differ mainly in the way air and fuel mix. They can be divided into two general classes:
A) Pre and after mix burners
B) Pre and post turbulence burners
C) Pre and post purge burners
D) Pre and post combustion burners
E) Before and after burners

Answer 17

A) Pre and after mix burners

Question 18

A solenoid type fuel valve:
A) Is held closed by electrical current
B) Does not have positive shut-off
C) Always opens rapidly
D) Is held closed by fuel pressure
E) Closes slowly

Answer 18

D) Is held closed by fuel pressure

Question 19

The main function of a gas burner is:
A) Air flow control
B) Atomization of the fuel
C) To provide intimate O2 fuel contact
D) A source of ignition
E) Regulation of the fuel flow

Answer 19

C) To provide intimate O2 fuel contact

Question 20

The advantage of an automatic gas valve is that the valve opens _______, thus preventing “furnace puff”
A) Halfway
B) Immediately
C) Quickly
D) Slightly
E) Slowly

Answer 20

E) Slowly

Question 21

An air atomizing compressor is usually a/an:
A) Axial type
B) Centrifugal
C) Regenerative type
D) Rotary type
E) Variable displacement type

Answer 21

D) Rotary type

Question 22

An intermittent pilot:
A) Must be manually ignited
B) Lights the main burner and remains on with it
C) Lights a pilot burner then extinguishes
D) Remains on when the main burner extinguishes
E) Lights the main burner then extinguishes

Answer 22

B) Lights the main burner and remains on with it

Question 23

To which of the following oil burners is the oil supplied under high pressure?
A) Multi-spud burner
B) Air atomizing burner
C) Rotary cup burner
D) Mechanical atomizing burner
E) Premix atomizing burner

Answer 23

D) Mechanical atomizing burner

Question 24

The Venturi tube in the atmospheric burner mixing head has a:
A) Gradually decreasing cross-sectional area
B) Sharply decreasing cross-sectional area
C) Gradually increasing cross-sectional area
D) Uniformly distributed cross-sectional area
E) Sharply increasing cross-sectional area

Answer 24

C) Gradually increasing cross-sectional area

Question 25

Improper adjustment of the electrodes, poor insulation, or weak ignition may cause delayed ignition in a fuel oil combustion system resulting in a:
A) Gas valve failure
B) Water hammer
C) Pressure explosion
D) Puff back
E) Corrosion damage

Answer 25

D) Puff back

Question 26

The motorized gas valve uses a cam or pump to operate the valve. Both types of valve use:
A) An armature tapping bleed
B) Spring and supply pressure to open
C) An electric motor
D) A diaphragm assembly
E) Quick to open, slow to close

Answer 26

C) An electric motor

Question 27

Primary Air (PA) is:
A) Also called tertiary air
B) Also called secondary air
C) The first air to make contact with the fuel
D) The air used to create a “shearing” action on the fuel within the burner
E) The air used to ensure complete combustion

Answer 27

C) The first air to make contact with the fuel

Question 28

Upon activation the two-way pilot valve in the diaphragm gas valve switches so that the:
A) Supply port closes and the bleed port opens
B) The supply pressure acting on bottom of the diaphragm forces it up
C) Supply port opens and the bleed port closes
D) Supply port opens and the bleed port opens
E) The supply pressure acting on the top of the diaphragm forces it up

Answer 28

A) Supply port closes and the bleed port opens

Question 29

A continuous pilot or standing pilot:
A) Is automatically ignited at the start of each burner operation and continuous to burn throughout the main burner period
B) Is automatically ignited
C) Burns at all times
D) Is used to light off the main burner but does not burn throughout the burner period
E) Can act as the main burner

Answer 29

C) Burns at all times

Question 30

The air atomizing burner uses compressed air at about 100kPa (15psi) as atomizing air also called _______ air.
A) Primary
B) Tertiary
C) Over fire
D) Combustion
E) Secondary

Answer 30

A) Primary

Question 31

A disadvantage of a refractory burner is:
A) The metal burner parts are exposed to high temperatures
B) It’s high cost
C) It is a simple design
D) The short luminous flame spreads over a large cross-section of the furnace resulting in high radiant heat transfer
E) The gas and air mixture is thoroughly preheated before it enters the furnace

Answer 31

B) It’s high cost

Question 32

An important factor application to automatic fuel valves is:
A) Slow closing
B) Negative shutoff
C) Positive shutoff
D) Positive opening
E) Fast opening

Answer 32

C) Positive shutoff

Question 33

Which of the following are the most common types of valves used to allow the flow of gas to the burners of a heating boiler?
A) Solenoid valve
B) Diaphragm gas valve
C) Motorized gas valve
D) All of the above

Answer 33

D) All of the above

Question 34

Solenoid valves used on gas and oil-fired boilers are what type of valve?
A) Gate
B) Plug
C) Ball
D) Globe
E) Needle

Answer 34

D) Globe

Question 35

The time-delay oil valve is adjusted to open automatically and allow oil flow to the burner from ________ seconds after the start of the igniter.
A) 10-15
B) 0-5
C) 5-15
D) 5-10
E) 15-20

Answer 35

C) 5-15

Question 36

The diaphragm gas valve has a two-way pilot valve that:
A) Allows supply pressure gas to flow to the top of the diaphragm closing chamber and hold the main valve open
B) Allows supply pressure gas to flow to the bottom of the diaphragm closing chamber and hold the main valve open
C) On shutdown closes a bleed port and opens a closing port
D) On shutdown opens a bleed port and closes an opening port
E) Allows supply pressure gas to flow to the bottom of the diaphragm closing chamber and hold the main valve closed

Answer 36

C) On shutdown closes a bleed port and opens a closing port