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Book 1 PanGlobal Assessment Test Unit One: Boiler Details (5th Class Power Engr) > Chapter 10 Boiler Programming Controls > Flashcards

Chapter 10 Boiler Programming Controls Flashcards

1
Q
  1. The programmed startup sequence of oil-fired boilers with no pilot light is as follows:
  2. The flame detector senses the flame and causes the flame relay to close
  3. The spark from the ignition transformer ignites the main burner
  4. The load relay energizes the ignition transformer, fuel oil shut-off valve, and motor driving the air fan and fuel pump
  5. The ignition transformer is then de-energized
  6. The operating control closes a switch
A. 1, 2, 3, 4, 5 
B. 4, 5, 2, 1, 3 
C. 3, 2, 1, 5, 4 
D. 2, 5, 1, 4, 3 
E. 5, 3, 2, 1, 4
A

E. 5, 3, 2, 1, 4

  1. The operating control “closes a switch”
  2. The “load relay” energizes the ignition transformer, fuel oil shut-off valve, and motor driving the air fan and fuel pump
  3. The “spark” from the ignition transformer ignites the main burner
  4. The “flame detector” senses the flame and causes the flame relay to close
  5. The “ignition” transformer is then de-energized
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2
Q
  1. Purging a furnace means forcing a flow of:

A. Air through a furnace for a set period of time when the burner is not in operation.
B. Air through a furnace for a set period of time when the burner is in operation.
C. Fuel 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 in operation.
E. Water through a furnace for a set period of time when the burner is in operation.

A

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

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3
Q
  1. The lock-out switch will be actuated when the:
A. Operating control closes 
B. Low water fuel cut-off opens 
C. Flame scanner loses the flame 
D. Power fails 
E. Operating control opens
A

C. Flame scanner loses the flame

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4
Q
  1. If the combustion control safety “lock-out switch is tripped”:
A. Reset safety lock-out switch 
B. Replace motor 
C. Close the blower switch 
D. Refer to manufacturer's manual 
E. Check the low air pressure switch
A

A. “Reset” safety lock-out switch

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5
Q

5.Before a steam or hot water boiler can be started by a programming control, all but one of the following conditions must be fulfilled:

A. The water in the boiler drum must be above the cut-off point of the low-water fuel cut-off

B. All manually operated valves in the fuel lines to the pilot and main burner must be closed

C. If the boiler is gas-fired, the fuel supply pressure to the burner valves must be above the cutout point of the low gas pressure cut-off

D. The steam pressure or water temperature must be at or below the cut-in setting of the operating control

E. The main power switch or breaker must be closed

A

B. All “manually operated valves” in the fuel lines to the pilot and main burner “must be closed”

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6
Q

6.If the pilot burner fails to ignite, or if the pilot does go on, the gas burner fails to ignite a lockout switch will be energized after a short trial period of _____ seconds from the time of startup.

A. 5 to 10 
B. 10 to 20 
C. 15 to 30 
D. 20 to 40
E. 30 to 50
A

C. 15 to 30

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7
Q
  1. A programming control on a natural draft gas fires boiler operates in the following sequence.
  2. The main burner is ignited
  3. The flame detector senses the flame and causes the main gas valve to open
  4. The ignition transformer and pilot gas valve are de-energized and closed, if an interrupted pilot is used
  5. The operating control initiates a startup
  6. The load relay energizes the ignition transformer and the pilot gas valve
A. 1, 2, 3, 4, 5 
B. 4, 5, 2, 1, 3 
C. 3, 2, 1, 5, 4 
D. 2, 5, 1, 4, 3 
E. 5, 3, 2, 1, 4
A

B. 4, 5, 2, 1, 3

  1. The operating control “initiates a startup’’
  2. The load “relay energizes” the ignition transformer and the pilot gas valve
  3. The flame “detector senses the flame” and causes the main gas valve to open
  4. The main “burner is ignited”
  5. The ignition transformer and pilot gas valve are “de-energized” and closed, if an interrupted pilot is used
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8
Q
  1. 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. A short time period has passed 
B. The switch has been manually reset 
C. The switch resets automatically
D. The furnace has been purged 
E. The fuel valve has been reset
A

B. The switch has been manually reset

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9
Q
  1. The switch in the “operating control” of a steam boiler is “closed” by:
A. Falling steam temperature 
B. Rising steam temperature 
C. Falling steam pressure 
D. Rising steam pressure
E. Falling water pressure
A

A. Falling steam “temperature”

Note: Temperature

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10
Q
  1. The switch in the “operating control of a hot water boiler is opened” by:
A. Rising water temperature 
B. Rising steam temperature 
C. Rising water pressure 
D. Falling water temperature 
E. Falling water pressure
A

A. Rising water temperature (“operating control of a hot water boiler is opened”)
Note: So when its OPEN water temperature RISING
when its CLOSE it will Failing in Water Temperature

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11
Q
  1. If the combustion “control safety lock-out switch is tripped”:
A. Reset safety lock-out switch 
B. Replace motor 
C. Close the blower switch 
D. Refer to manufacturer's manual 
E. Check the low air pressure switch
A

A. Reset safety lock-out switch

Note:If it TRIPPED

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12
Q

12.What is the name given to the component that coordinates and sequences the boiler operation?

A. Boiler master 
B. Header pressure controller 
C. Air/fuel ratio controller 
D. Programming controller 
E. Plant controller
A

D. Programming controller

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13
Q

13.If the “blower starts but stops again after 5-10 seconds:”

A. Replace motor 
B. Reset safety lock-out switch 
C. Close the blower switch 
D. Refer to manufacturer's manual 
E. Check the low air pressure switch
A

E. “Check’’ the low air pressure switch

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14
Q

14.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
A

D. 1, 3

on-off and modulating

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15
Q

15.The switch in the operating control of a hot water boiler is closed by:

A. Falling steam temperature 
B. Rising steam temperature 
C. Rising water pressure
D. Falling water temperature 
E. Falling water pressure
A

D. Falling water temperature

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16
Q

16.Each time the boiler starts up it has to go through:

A. Standard checks associated with a safe startup procedure. 
B. A test of the combustion control 
C. Standard checks on the water quality 
D. A water purge procedure 
E. Standard fuel system safety checks
A

A. “Standard” checks associated with a “safe” startup procedure.

Book 1 PanGlobal Assessment Test Unit One: Boiler Details (5th Class Power Engr) (24 decks)

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