Routine and emergency Boiler Operation Flashcards

1
Q
A wide and rapid fluctuating water level in the boiler gage
glass may be the result of
a) high TDS
b) a vapour bound boiler feed pump
c) low alkalinity
d) low pH
e) boiler firing rate being too low
A

a) high TDS

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2
Q

A natural gas fired power boiler flame should be
a) very slow, long, and mostly yellow or orange
b) fairly rapid, mostly blue, and some orange
c) very rapid, short, very audible, and have no orange
d) very white and intense, requiring coloured glass for
viewing
e) bright enough to require coloured glass for viewing

A

b) fairly rapid, mostly blue, and some orange

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3
Q

When performing a sootblowing operation it is important to
maintain flame stability and
a) ensure drum water level remains constant
b) firing rate not be allowed to increase
c) stack discharge not become visible
d) dislodged soot and ash leave the boiler with the flue
gases
e) the local environmental agency be notified prior to
blowing

A

d) dislodged soot and ash leave the boiler with the flue

gases

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4
Q

While blowing down a boiler which is in operation, you should

a) check the rest of the boiler room equipment
b) fill in the log book for your shift
c) concentrate only on blowing down the boiler
d) clean up the area close to the boiler
e) add more water to the boiler to replace the blow down water

A

c) concentrate only on blowing down the boiler

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5
Q

In the event of a low water condition in a boiler the
engineer in charge should
a) shut down the burner immediately
b) continue firing and restore the level
c) shut down the burner, let the unit cool, then inspect it
d) shut down the burner, let the unit cool, then restore
level
e) notify the Chief Engineer before responding to the
condition

A

c) shut down the burner, let the unit cool, then inspect it

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6
Q

A high water level in a boiler
a) will not be made worse by dropping boiler pressure or
allowing “swell” to occur
b) should cause a high water level shutdown switch to stop
the fire
c) is usually the result of a boiler feedpump malfunction
d) will necessitate an immediate shutdown, cool down, and
inspection
e) is usually the result of a level control malfunction

A

e) is usually the result of a level control malfunction

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7
Q

In the event of a flame failure, an automatic boiler will
close the fuel valve and usually
a) begin a re-start cycle immediately
b) perform a post-purge
c) reset itself
d) simply restart itself with no human intervention
e) stop the boiler feedpump

A

b) perform a post-purge

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8
Q

When you first notice that the water level in the boiler gauge
glass can no longer be seen, it is best first to
a) ensure that the boiler is not over filled
b) start the stand-by feed pump or injector
c) shut off the boiler fuel supply
d) close the main steam valve
e) ensure the glass is not leaking

A

a) ensure that the boiler is not over filled

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9
Q

If the safety valve on a boiler pops and the only pressure gauge
indicates well below pop pressure, you would
a) notify the Boiler Inspector
b) reduce boiler pressure and get the gauge checked
c) shut down to fix the safety valve
d) increase spring pressure on safety valve
e) shut down the boiler and replace the safety valve and
gauge glass

A

b) reduce boiler pressure and get the gauge checked

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10
Q

If the boiler safety valves open during boiler operation, you
should
a) close the non-return valve on the boiler drum
b) shut the boiler down immediately
c) increase the forced draft flow to cool the boiler
d) open the blowdown valves
e) reduce the fuel and air flow to the boiler

A

e) reduce the fuel and air flow to the boiler

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11
Q

What causes the level in the gage glass to be higher than in
the drum?
a) column drain valve leaking
b) steam valve on the gage glass closed
c) swell in boiler steam drum
d) starting up of the stand-by feedwater pump
e) guage glass steam and water valves are both open

A

b) steam valve on the gage glass closed

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12
Q

What causes the level in the gauge glass to be lower than
the water level in the boiler?
a) steam valve on the gauge glass closed
b) shrinkage in the boiler steam drum
c) drain valve on the gauge glass leaking
d) top try cock open
e) the steam pressure is excessively high

A

c) drain valve on the gauge glass leaking

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13
Q

A firetube boiler furnace explosion
a) can be the result of too much scale on boiler tubes
b) is more disastrous than a pressure or waterside explosion
c) may be the result of oil in the water causing a foaming
condition
d) may result from a flame scanner not working properly
e) could be caused by poor water circulation

A

d) may result from a flame scanner not working properly

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14
Q

A boiler pressure or waterside explosion

a) could be the result of water in the fuel oil
b) could be the result of inadequate ignition
c) may be caused by a low water condition
d) could result from improper sootblowing procedures
e) could be the result of broken refractory

A

c) may be caused by a low water condition

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15
Q

A reason for many boiler accidents may be due to
a) inadequate training of operating personnel
b) log books being kept up to date and adequate
c) the regular testing and checking of control devices
d) not asking the insurance companies to inspect boilers
more often
e) safety valves being oversized

A

a) inadequate training of operating personnel

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16
Q

The best method of ensuring adequate attention is being given
to the boiler and its controlling and safety devices is to
a) schedule regular testing and checking procedures
b) maintain a log book showing testing results and by whom
they were done
c) request staff to perform checks weekly
d) have faith in the personnel
e) always maintain good oral communication lines about tests
and checks

A

b) maintain a log book showing testing results and by whom

17
Q

Most furnace explosions occur

a) during the lighting up of a boiler burner
b) during the shutting down of a burner
c) during the purge period of lighting a boiler furnace
d) during the period of increasing the load
e) when steam pressure is excessive

A

a) during the lighting up of a boiler burner

18
Q

When additional gas burners are required, they may be ignited

a) from an adjacent burner
b) by the flame detector
c) by means of a transformer relay
d) by a flame rod
e) by means of a torch

A

e) by means of a torch

19
Q

The purging process for a furnace should be done

a) before each burner is lit
b) with the fuel valve closed
c) with the fuel valve in the open position
d) before the second burner is lit
e) with the pilot light on

A

b) with the fuel valve closed

20
Q

One cause of flame failure in oil or gas fired boilers is

a) excessive fuel temperature
b) fuel pressure being too high
c) the fuel being too volatile
d) water in the fuel
e) the hydrogen content is too low

A

d) water in the fuel

21
Q

Attempting to light one burner from another burner during the
operation, can
a) cause the lit burner to be blown out
b) cause the fuel oil in the supply tank to surge
c) put the ignitor out
d) not cause the furnace to explode
e) cause a furnace explosion

A

e) cause a furnace explosion

22
Q

If the main burner fails, this could cause
a) the steam atomizing pressure to increase
b) admission of unburned fuel to the furnace which may
explode
c) the boiler efficiency to increase
d) the fuel valve to stay open
e) the pilot light to go out

A

b) admission of unburned fuel to the furnace which may

explode

23
Q
Poor combustion due to the insufficient amount of \_\_\_\_\_\_\_\_\_\_
may cause a furnace explosion.
a) gas
b) fuel
c) heat
d) air
e) hydrocarbons
A

d) air

24
Q
Failure to \_\_\_\_\_\_\_\_\_\_ the furnace thoroughly before light-up
can cause a furnace explosion.
a) heat
b) drain
c) prime
d) cool
e) purge
A

e) purge

25
Q
Attempting to light a burner \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ may
cause a furnace explosion.
a) from hot refractory
b) without preheating the fuel
c) without first cooling the fuel
d) without a pilot light
e) by pre-purging the furnace
A

a) from hot refractory

26
Q
Pressure explosions occur when a pressure part of the boiler
such as the shell, furnace, or firetube bursts due to too
high a steam pressure or a structural weakening of the metal.
This weakening may be caused by:
1. corrosion
2. thermal stress
3. overheating
4. scale and sludge build-up
5. insufficient combustion air
a) 1, 3, 4, 5
b) 2, 3, 4, 5
c) 1, 2, 3, 4
d) 1, 2, 4, 5
e) 1, 2, 3, 5
A

c) 1, 2, 3, 4