Book 1 Review

Question 1

The gas burners of hot oil heaters are mounted:
A) On the walls of the furnace
B) On the front of the furnace
C) On the floor of the furnace
D) On the roof of the furnace
E) External to the furnace

Answer 1

C) On the floor of the furnace

Question 2

The slip expansion joint is suitable for:
A) Medium and high pressures
B) Medium and high temperature
C) Low and medium temperatures
D) Low and high pressures
E) Low and medium pressures

Answer 2

E) Low and medium pressures

Question 3

Quick closing gauge glass valves are operated by:
A) Diaphragms
B) Valve rods
C) Actuators
D) Levers and chains
E) Solenoids

Answer 3

D) Levers and chains

Question 4

A disadvantage of condensing boilers is that:
A) Any moisture in the flue gases will not condense out
B) The boilers are more expensive than customary boilers
C) The boilers are less expensive than customary boilers
D) The heat exchangers in them are quite small
E) Less heat is extracted from the hot flue gases

Answer 4

B) The boilers are more expensive than customary boilers

Question 5

The blowdown connection is made to the:
A) Highest point of the boiler shell
B) Highest point of the steam drum
C) Highest point of the mud drum
D) Lowest point of the steam drum
E) Lowest point of the mud drum

Answer 5

E) Lowest point of the mud drum

Question 6

With reference to hot oil systems the acronym FCV stands for:
A) Flow control valve
B) Flow cutoff valve
C) Fuel cutoff valve
D) Full cascade valve
E) Fuel control valve

Answer 6

A) Flow control valve

Question 7

If the combustion is complete the sulphuric will combine with the oxygen to produce ________ plus heat.
A) Water vapour
B) Sulphur dioxide
C) Carbon dioxide
D) Carbon monoxide
E) Sulphur monoxide

Answer 7

B) Sulphur dioxide

Question 8

An advantage of plastic piping is:
A) Ease of assembly
B) Resistance to high temperatures
C) Ease of corrosion
D) High cost

Answer 8

A) Ease of assembly

Question 9

When the heating plant has two or more boilers supplying steam to a common steam supply header and one or more boilers are already in operation the_________ during the warm-up period.
A) Feedwater valve of the boiler that is being started up must be kept closed
B) Feedwater stop valve of the boiler that is being started up must be kept open
C) Steam vent valve of the boiler that is being started up must be kept open
D) Steam stop valve of the boiler that is being started up must be kept open
E) Steam stop valve of the boiler that is being started up must be kept closed

Answer 9

E) Steam stop valve of the boiler that is being started up must be kept closed

Question 10

If damp conditions exist during the idle season, the metal surfaces should be painted with a protective coating such as:
A) Oil based paint
B) Fuel oil
C) Latex paint
D) Grease
E) Light oil

Answer 10

E) Light oil

Question 11

The purpose of the gauge glass or water gauge is to show the __________ in the boiler.
A) Steam level
B) Colour of the water
C) Temperature of the steam
D) Pressure of the water
E) Water level

Answer 11

E) Water level

Question 12

Pressure gauges may loose their accuracy due to:
A) Wear and tear
B) Steam entering the Bourbon tube
C) Metal fatigue
D) Excessive vibration
E) All of the above

Answer 12

E) All of the above

Question 13

Since pure water will not conduct electricity a predetermined amount of electrolyte (__________) is dissolved in the water.
A) H2SO4
B) HCl
C) NaSO3
D) NaCl
E) NaOH

Answer 13

D) NaCl

Question 14

Overheating of the tube wall may be caused by all but:
A) Failure of the low water fuel cut-off
B) Low excess air
C) Heavy scale forming on the tubes
D) Poor water circulation
E) An excessive firing rate

Answer 14

B) Low excess air

Question 15

Tubes adjacent to sootblowers are examined for signs of _________ due to direct impingement of steam from the blowers.
A) Overheating
B) Erosion
C) Corrosion
D) Oxygen pitting
E) Caustic embrittlement

Answer 15

B) Erosion

Question 16

The flash point is the __________ at which the fuel oil gives off enough vapour to ignite when exposed to an open flame but not continue to burn.
A) Highest temperature
B) Auto ignition temperature
C) Lowest temperature
D) Lowest pressure
E) Highest pressure

Answer 16

C) Lowest temperature

Question 17

Normally in a steam boiler when the water level drops to the low-water cut-off point, the boiler will:
A) Experience a failure of a pressure component
B) Automatically open the emergency feedwater valve
C) Sound an alarm in the control room
D) Shut down automatically
E) Continue to operate normally

Answer 17

D) Shut down automatically

Question 18

An automatic/manual selector switch is provided on a boiler with the following burner control system.
A) Operating limit fire control
B) High limit fire control
C) High-low fire control
D) On-off fire control
E) Modulating fire control

Answer 18

E) Modulating fire control

Question 19

If the water level in a steam boiler is found to be below the gauge glass, the boiler should be:
A) Shut down immediately
B) Filled immediately with warm water
C) Allowed sufficient time to return to normal
D) Filled immediately with cold water
E) Reduced to minimum load

Answer 19

A) Shut down immediately

Question 20

A thermocouple consists of two dissimilar wires welded together at one end to form a:
A) Metering junction
B) Cold junction
C) Reference junction
D) Hot junction
E) Electric circuit

Answer 20

D) Hot junction

Question 21

The operation of a system with two or three fixed capacity nozzles is controlled by the operating pressure or temperature control on the boiler on an ________ cycle.
A) Seam flow fuel flow
B) Modulating
C) Air flow fuel flow
D) On-off
E) Low-high-low

Answer 21

E) Low-high-low

Question 22

The switch in the operating control of a steam boiler is opened by:
A) Falling steam pressure
B) Falling water pressure
C) Rising steam temperature
D) Falling steam temperature
E) Rising steam pressure

Answer 22

E) Rising steam pressure

Question 23

A U-tube draft gauge is also known as a:
A) Psychrometer
B) Viscometer
C) Pressure gauge
D) Thermometer
E) Manometer

Answer 23

E) Manometer

Question 24

The component of natural gas that occupies 10%-20% is:
A) Methane
B) Ethane
C) Butane
D) Propane
E) Hydrogen sulphide

Answer 24

B) Ethane

Question 25

The average heating value of coal (bituminous) is:
A) 93,150 kJ/m3 (2,500 Btu/ft3)
B) 37,260 kJ/m3 (1,000 Btu/ft3)
C) 122,200 kJ/m3 (3,280 Btu/ft3)
D) 25,600 kJ/m3 (11,000 Btu/ft3)
E) 45,260 kJ/m3 (19,500 Btu/ft3)

Answer 25

D) 25,600 kJ/m3 (11,000 Btu/ft3)

Question 26

All valves not properly or clearly identified should be:
A) Used as they are available
B) Kept for emergency use
C) Sold for scrap
D) Rejected
E) Used in non critical areas

Answer 26

D) Rejected

Question 27

The most important rule in the safe operation of steam boilers is to:
A) Keep water in the boiler at the proper level
B) Blowdown the gauge glass regularly
C) Add chemicals to the boiler feedwater
D) Keep the boiler pressure below the safety valve setting
E) Keep the feedwater chemical free

Answer 27

A) Keep water in the boiler at the proper level

Question 28

The rotary cup oil burner rotates at about _________ r/min.
A) 3,500
B) 2,500
C) 1500
D) 3 000

Answer 28

A) 3500

Question 29

Threaded cast iron pipe fittings cannot be used for _______ service piping systems.
A) Steam
B) Water
C) gas
D) Oil
E) Chemicals

Answer 29

C) Gas

Question 30

The float operated low water fuel cut-off works on the principle of:
A) Steam density
B) Drum level variation
C) Temperature change
D) Buoyancy
E) Differential pressure

Answer 30

D) Buoyancy

Question 31

In the wet boiler lay up method chemicals are added to bring the boiler water to the required.
A) TDS
B) pH
C) Excess oxygen scavenger level
D) Density
E) Acidity

Answer 31

C) Excess oxygen scavenger level

Question 32

The on-off pressure controller contains two adjustable variables, one is the pressure adjustment and the other is the:
A) Differential adjustment
B) Operating lever
C) Cut-in lever
D) Levelling indicator
E) Pressure bellows

Answer 32

A) Differential adjustment

Question 33

With reference to Power Engineering the letters “SIAP” mean:
A) Steam, Interpret, Analyze, Pressure
B) Sense, Interpret, Analyze, Perform
C) Steam, Increase, Answer, Power
D) Steam, Interpret, Analyze, Perform
E) Sense, Increase, Answer, Perform

Answer 33

B) Sense, Interpret, Analyze, Perform

Question 34

Cast-iron boiler sections maximize heat transfer by:
A) Exposing as large a surface as possible to the hot gases
B) Vertical firing
C) Utilizing an external furnace
D) Using four push nipples per section
E) Using a large economizer

Answer 34

A) Exposing as large a surface as possible to the hot gases

Question 35

Overheated oil will break down forming a solid mass of carbon called:
A) Carbon
B) Graphite
C) Coke
D) Steel
E) Coal

Answer 35

C) Coke

Question 36

The draft created by the fan can be controlled by the:
A) Amount of fuel supplied
B) Height of the stack
C) Temperature of the flue gases
D) Speed of the dampers
E) Use of inlet dampers

Answer 36

E) Use of inlet dampers

Question 37

The discharge piping from the relief valve should be piped to a safe point for disposal and can be:
A) Terminated above a floor drain
B) Connected to the deaerator
C) Connected to any vent
D) Connected to the condensate tank
E) Connected to any drain

Answer 37

A) Terminated above a floor drain

Question 38

The purpose of the steam trap is to discharge water and condensate from steam lines and equipment without:
A) Permitting steam to enter
B) Permitting corrosion
C) Letting air escape
D) Permitting steam to escape
E) Letting air enter

Answer 38

D) Permitting steam to escape

Question 39

The HRT boiler is classified as a ________ pass boiler.
A) Four
B) Two
C) Three
D) Multi
E) One

Answer 39

B) Two

Question 40

It is unlawful to have any welder other than the holder of a Pressure Welder Certificate and a valid _________ do any welding on any pressure part of the boiler.
A) First aid certificate
B) “B” pressure ticket
C) Union card
D) Quality assurance card
E) Performance Qualification Card

Answer 40

E) Performance Qualification Card

Question 41

One of the different general classes of traps according to their principle of operation is the ________ trap.
A) Pneumatic
B) Electrical
C) Hydraulic
D) Thermodynamic
E) Electronic

Answer 41

D) Thermodynamic

Question 42

The slip expansion joint requires __________ than the expansion bend.
A) Higher pressures
B) Higher temperatures
C) Less space
D) More space
E) Lower temperatures

Answer 42

C) Less space

Question 43

The safety valve pop test can be carried out by:
A) Reducing the pressure on the spring
B) Slowly raising the boiler pressure
C) Lowering the try lever
D) Lifting the try lever
E) Popping the valve with a hammer

Answer 43

B) Slowly raising the boiler pressure

Question 44

Which of the following is not a characteristic of materials suitable for use as insulation?
A) Ability to retain its shape and insulating value when wet
B) High insulating value
C) Long life
D) Vermin proof
E) Corrosive

Answer 44

E) Corrosive

Question 45

Valve stem leaks can normally be fixed by:
A) Tightening the hand wheel down
B) Tightening the hand wheel nut
C) Slightly backing off the hand wheel
D) Slightly tightening the packing nut or gland
E) Tightening the bonnet connection

Answer 45

D) Slightly tightening the packing nut or gland

Question 46

One of the types of expansion joints in general use is the ________ expansion joint.
A) Slip
B) Double offset u-bend
C) U-bend
D) Elbow
E) Coupling

Answer 46

A) Slip

Question 47

The service temperature limit of Elastomeric insulation is:
A) 1038ºC (1900ºF)
B) 454ºC (850ºF)
C) 650ºC (1200ºF)
D) 104ºC (219ºF)
E) 320ºC (608ºF)

Answer 47

D) 104ºC (219ºF)

Question 48

A valve bonnet leak is from the connection between the:
A) Stem and the disc
B) Bonnet and the gland
C) Bonnet and the body
D) Bonnet and the disc
E) Stem and the gland

Answer 48

C) Bonnet and the body

Question 49

The switch in the operating control of a hot water boiler is opened by:
A) Falling water pressure
B) Rising steam temperature
C) Rising water pressure
D) Rising water temperature
E) Falling water temperature

Answer 49

D) Rising water temperature

Question 50

The diameter of commercial pipe is measured by its:
A) Inside diameter
B) Nominal pipe size
C) Outside diameter
D) Wall thickness
E) Natural pipe size

Answer 50

B) Nominal pipe size

Question 51

Valve packing surrounds the:
A) Stem
B) Disc
C) Body
D) Bonnet
E) Packing gland

Answer 51

A) Stem

Question 52

At normal boiler steaming rates, a condensate receiver tank should contain a sufficient volume of water equivalent to the water evaporated by the boiler for a maximum period of ________ minutes.
A) 60
B) 15
C) 30
D) 20
E) 45

Answer 52

C) 30

Question 53

The vertical firetube boiler should be warmed up slowly in order to prevent overheating of the:
A) Crown sheet and water legs
B) Crown sheet and barrel
C) Tubes and upper tube sheet
D) Tubes and lower tube sheet
E) Steam drum and mud drum

Answer 53

C) Tubes and upper tube sheet

Question 54

The major components of a typical hot oil system include the furnace, pump, control devices and the:
A) Containment dyke
B) Stack damper
C) Gas blanket
D) Relief valve
E) Surge tank

Answer 54

E) Surge tank

Question 55

The grooved pipe system uses a joining connection made with a/an ____________ that also serves as a union between the fitting and the piping.
A) Elbow
B) Coupling collar
C) Flange fitting
D) Quick couple
E) Adaptor

Answer 55

B) Coupling collar

Question 56

Possible causes of low water level include:
1. Leaks caused by breakage or corrosion
2. Excessive blowdown
3. Automatic feedwater valve passing
4. Boiler feed pump failure
5. Excessive make-up

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

Answer 56

C) 1,2,4

Question 57

Convection type oil heaters for a hot oil system have:
A) An efficiency of about 75% to 85%
B) Mechanical draft combustion systems
C) Efficiencies of about 40% to 50%
D) Combustion gases flowing inside tubes
E) Tubes containing fins on their inner surfaces

Answer 57

A) An efficiency of about 75% to 85%

Question 58

When a cold, gas-fired boiler is started up, condensation (sweating) may occur to such an extent that it appears that the boiler is leaking. What (if anything) should be done to stop this?
A) Decrease the fuel/air ratio to stop the sweating
B) Decrease the firing rate to stop the sweating
C) Increase the fuel/air ratio to stop the sweating
D) Increase the firing rate to stop the sweating
E) This condensation will stop after the boiler becomes hot

Answer 58

E) This condensation will stop after the boiler becomes hot

Question 59

Before closing manhole and handhole openings:
1. Make sure that the seating surfaces are clean
2. Traces of old gaskets left behind may cause leakage
3. Use old gaskets coated with powdered graphite or a gasket compound
4. Use new gaskets

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

Answer 59

C) 1,2,4

Question 60

The time taken for the automatic pilot valve to close in the event of a loss of flame detection is about ________ seconds
A) 2
B) 10
C) 15
D) 20
E) 4

Answer 60

B) 10

Question 61

Oils intended for use as heat transfer fluid in a hot oil system should:
A) Have a high viscosity
B) Have a low vapour pressure at operating temperature
C) Be corrosive to metals used in the system
D) Resist thermal breakdown at low operating temperatures
E) Possess low heat transfer characteristics

Answer 61

B) Have a low vapour pressure at operating temperature

Question 62

After cleaning, cast-iron boilers should be left completely filled with__________ in order to reduce corrosion.
A) A slightly acidic solution
B) A mixture of oil and antifreeze
C) A slightly basic solution
D) Light oil
E) Water

Answer 62

E) Water

Question 63

Copper and copper alloys offer great resistance to:
A) Creep
B) Thermal expansion
C) High pressure
D) Corrosion
E) Breakage

Answer 63

D) Corrosion

Question 64

Valves can be manually operated or they can have a/an _________ to change and control the valve opening.
A) Positioner
B) Accumulator
C) Actuator
D) Assistance
E) Driver

Answer 64

C) Actuator

Question 65

If boiler water level has dropped below the gauge glass during operation, the operator is to:
A) Slowly reduce the boiler load
B) Immediately restore water level before shutting off the unit
C) Shut down, cool, and then inspect the boiler for damage before refilling
D) Open the blowdown valves in order to have the low water fuel cut-off trip the unit
E) Contact the boiler inspector immediately

Answer 65

C) Shut down, cool, and then inspect the boiler for damage before refilling

Question 66

Standard antifriction bearings normally require lubrication once every ________ year/s.
A) 3
B) 5
C) 1
D) 4
E) 2

Answer 66

C) 1

Question 67

The high-low fire control method requires two pressure controllers, one is called the high-low fire control and the other is called the:
A) Operating limit pressure control
B) Operating limit fire control
C) Modulating fire control
D) High limit fire control
E) On-off fire control

Answer 67

A) Operating limit pressure control

Question 68

To ensure complete combustion of the fuel in the furnace one of the following conditions must be fulfilled.
A) The temperature in the furnace must be high enough to ignite the fuel as it enters
B) Enough air must be supplied to the furnace to provide sufficient nitrogen to combine with all the combustible elements of the fuel
C) The air and the fuel must be thoroughly mixed together so that each particle of fuel can come in contact with the necessary nitrogen
D) The furnace must be small enough to allow sufficient time for the combustion to be completed before the gases strike the cooler areas of the heating surfaces
E) The fuel must be in the solid state

Answer 68

A) The temperature in the furnace must be high enough to ignite the fuel as it enters

Question 69

Quick closing gauge glass valves require ________ turn/s to close.
A) 1
B) 2
C) 3
D) 1/4
E) 1/2

Answer 69

D) 1/4

Question 70

Joining or connecting lengths of piping by the use of threaded pipe and screwed connections has the advantage of:
A) There is no chance of leakage
B) Gaskets are not required
C) The piping can be easily assembled or disassembled
D) A qualified welder must be used
E) The strength of the pipe is not reduced

Answer 70

C) The piping can be easily assembled or disassembled

Question 71

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

Answer 71

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

Question 72

An advantage of the forced draft fan over the induced draft fan is that the forced draft fan:
A) Handles the fuel fed to the burner
B) Requires more expensive materials
C) Endures higher temperatures
D) Handles hot air only
E) Handles lower volumes of gases

Answer 72

E) Handles lower volumes of gases

Question 73

The refractory brick of the hot oil heater should be inspected for:
A) Abnormal cracks
B) Colour
C) Hardness
D) Density
E) Consistency

Answer 73

A) Abnormal cracks

Question 74

A programming control on a natural draft gas fired boiler operates in the following sequence:
1. The main burner is ignited
2. The flame detector senses the flame and causes the main gas valve to open
3. The ignition transformer and pilot gas valve are de-energized and closed, if an interrupted pilot is used
4. The operating control initiates a startup
5. The load relay energizes the ignition transformer and the pilot gas valve

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

Answer 74

A) 4,5,2,1,3

Question 75

The automatic fill valve is a _______ valve which keeps the system filled with water and maintains a set pressure in the system.
A) Air vent valve
B) Temperature control valve
C) Pressure reducing valve
D) Pressure control valve
E) Back pressure valve

Answer 75

C) Pressure reducing valve

Question 76

During inhibited acid cleaning the boiler must be adequately vented because _________ is produced by the reaction of acid with iron and could cause a fire or explosion.
A) Carbon monoxide
B) Carbon dioxide
C) Hydrogen
D) Nitrogen
E) Oxygen

Answer 76

C) Hydrogen

Question 77

The fire point is the _________ the flash point which results in the fuel continuing to burn once ignited.
A) Temperature below
B) Pressure below
C) Pressure above
D) Auto ignition temperature below
E) Temperature above

Answer 77

E) Temperature above

Question 78

The operation of the thermostatic trap depends upon the difference in:
A) Density between the steam and the condensate
B) Pressure between the steam and the air
C) Temperature between the steam and the condensate
D) Temperature between the steam and the air
E) Pressure between the steam and the condensate

Answer 78

C) Temperature between the steam and the condensate

Question 79

One class of oil burner is the _______ burner.
A) Ring
B) Air or steam atomizing
C) After mix
D) Refractory
E) Pre-mix

Answer 79

B) Air or steam atomizing

Question 80

When the main steam stop valves of heating boilers are over 51 mm (2 in) it is recommended that _________ be used.
A) Solenoid operated valves
B) Globe valves
C) Gate valves
D) OS&Y valves with rising spindles
E) Diaphragm operated valves

Answer 80

D) OS&Y valves with rising spindles

Question 81

Purging of a furnace means forcing a flow of:
A) Water through a furnace for a set period of time when the burner is in operation
B) Air through a furnace for a set period of time when the burner is in operation
C) Air through a furnace for a set period of time when the burner is not in operation
D) Fuel through a furnace for a set period of time when the burner is not in operation
E) Fuel through a furnace for a set period of time when the burner is in operation

Answer 81

C) Air through a furnace for a set period of time when the burner is not in operation

Question 82

In the electrode type electric boiler the electrodes are located in the:
A) Windbox
B) Central generating chamber
C) Firebox
D) Watertube section
E) Firetube section

Answer 82

B) Central generating chamber

Question 83

In the dry boiler lay up method the boiler is dried out completely then trays with moisture absorbing materials such as _________ are placed in the shell.
1. Slack lime
2. Sodium sulphide
3. Activated alumina
4. Sodium hydroxide
5. Silica gel

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

Answer 83

B) 1,3,5

Question 84

The natural draft created by differential pressure can be changed by:
A) Decreasing the height of the stack
B) Increasing the density of the flue gas
C) Increasing the density of the fuel
D) Increasing the density of the air
E) Decreasing the density of the air

Answer 84

D) Increasing the density of the air

Question 85

The longitudinal drum boiler is a ____________ combustion gas pass boiler.
A) Three
B) Four
C) One
D) Five
E) Two

Answer 85

A) Three

Question 86

The most common type of rotary pump used for boiler fuel oil is the _______ pump.
A) Centrifugal
B) External or internal gear
C) Diaphragm
D) Rotary lobe
E) Piston

Answer 86

B) External or internal gear

Question 87

The coefficient of thermal conductivity (k) of a material is a measure of the amount of heat that will be _________ the material.
A) Absorbed into
B) Transmitted through
C) Generated by
D) Radiated from
E) Reflected by

Answer 87

B) Transmitted through

Question 88

An advantage of a cast-iron sectional boiler is:
A) Their large capacity
B) Light weight requiring a minimal foundation
C) The choice of assembly location
D) Small fixed size
E) It’s ability to withstand high pressure

Answer 88

C) The choice of assembly location

Question 89

One of the advantages of the serpentine watertube boiler is that the design it:
A) Decrease the height of the boiler
B) Increases the water capacity of the boiler
C) Eliminates expansion and contraction stress
D) Produces a smaller foot print
E) Is capable of very high steam pressures

Answer 89

C) Eliminates expansion and contraction stress

Question 90

The two types of boiler combustion control include:
1. On-off
2. Automatic
3. Modulating
4. Manual

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

Answer 90

D) 1,3

Question 91

Before installing a trap blow new lines clear of all:
A) Steam
B) Foreign matter
C) Air
D) Condensate
E) Carbon dioxide

Answer 91

B) Foreign matter

Question 92

In a bimetal steam trap, ___________ are welded together.
A) Strips of iron and constantan
B) Dissimilar metals
C) Strips of copper
D) Strips of tin
E) High temperature strips of plastic

Answer 92

B) Dissimilar metals

Question 93

A pressure gauge can most accurately be calibrated by using:
A) A dead weight tester
B) Another pressure gauge
C) Hydraulic comparator
D) The inspectors test gauge
E) A test gauge comparator

Answer 93

A) A dead weight tester

Question 94

The amount of air required for complete combustion is more than the theoretical air and is called:
A) Excess air
B) Theoretical air
C) Secondary air
D) Tertiary air
E) Primary air

Answer 94

A) Excess air

Question 95

If the burner fails to ignite during the ignition trial period, the lock-out switch is activated and the boiler cannot be restarted until:
A) The fuel valve has been reset
B) The switch has been manually reset
C) The switch resets automatically
D) A short time period has passed
E) The furnace has been purged

Answer 95

B) The switch has been manually reset

Question 96

A gaseous fuel used in a boilers could be:
A) Natural gas
B) Fuel oils
C) Diesel fuel
D) Coal
E) Wood

Answer 96

A) Natural gas

Question 97

The types of construction used with packaged boilers are:
1. A
2. B
3. C
4. D
5. O

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

Answer 97

C) 1,4,5

Question 98

If the combustion is complete the hydrogen will combine with the oxygen to produce __________ plus heat.
A) Carbon dioxide
B) Sulphur dioxide
C) Water vapour
D) Carbon monoxide
E) Sulphur monoxide

Answer 98

C) Water vapour

Question 99

Oils intended for use as heat transfer fluid in a hot oil system should:
A) Possess high heat transfer characteristics
B) Have a high vapour pressure at operating temperature
C) Have a high viscosity
D) Be corrosive to metals used in the system
E) Resist thermal breakdown at low operating temperatures

Answer 99

A) Possess high heat transfer characteristics

Question 100

Most traps are designed to discharge any _________ present in the lines or equipment.
A) Oxygen
B) Carbon dioxide
C) Air
D) Steam
E) Oil

Answer 100

C) Air