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Book 1 PanGlobal Assessment Test Unit One: Boiler Details (5th Class Power Engr) > Chapter 8 Boiler Operating Controls > Flashcards

Chapter 8 Boiler Operating Controls Flashcards

1
Q
  1. The high limit control of a steam heating boiler should operate at the:

A. Cut-out pressure of the operating control
B. Maximum allowable working pressure
C. Between the set pressures of the operating control and safety valve
D. Set pressure of the safety valve
E. Blowdown pressure of the safety valve

A

C. Between the “set pressures” of the operating control and safety valve

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2
Q

2.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. Modulating fire control 
B. On-Off fire control 
C. High limit fire control 
D. Operating limit pressure control 
E. Operating limit fire control
A

D. Operating “limit pressure” control

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3
Q

3.An “automatic/manual selector” switch is provided on a boiler with the following burner control system.

A. High-Low fire control 
B. On-Off fire control 
C. Modulating fire control 
D. High limit fire control 
E. Operating limit fire control
A

C. Modulating fire control

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4
Q
  1. The low “gas” pressure cut-off switch can be tested by:
    A. Closing the main gas valve quickly
    B. Slowly covering the air supply to the fan
    C. Slowly raising the boiler pressure above the operating set point
    D. Slowly closing the main gas valve
    E. Quickly closing the main burner shut-off valve
A

D. “Slowly” closing the main gas valve

Note: SLOWLY CLOSING

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5
Q
  1. The low “air” pressure cut-off switch can be tested by:

A. Closing the main gas valve quickly
B. Slowly covering the air supply to the fan
C. Slowly raising the boiler pressure above the operating setpoint
D. Slowly closing the main gas valve
E. Quickly closing the main burner shut-off valve

A

B. “Slowly covering” the air supply to the fan

Note: SLOWLY COVERING

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6
Q
  1. The hot water heating boiler burner control uses the _____ as the sensed variable.
A. Boiler water temperature 
B. Boiler water pressure
C. Feedwater pressure 
D. Drum water level 
E. Boiler steam temperature
A

A. Boiler water temperature

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7
Q

7.If the pressure of the gas supplied to the burner drops below a minimum value the _____ switch will de-energize the fuel valve.

A. Low gas pressure 
B. High gas pressure 
C. Low water level 
D. Low air pressure 
E. High limit
A

A. Low gas pressure

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8
Q

8.The On-Off pressure controller contains two adjustable variables, one is the pressure adjustment and the other is the:

A. Operating lever 
B. Differential adjustment 
C. Leveling indicator 
D. Pressure bellows 
E. Cut-in Lever
A

B. Differential adjustment

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9
Q

9.During boiler operation if the combustion “air pressure” drops to low the _____ switch will de-energize the fuel valve.

A. Low gas pressure 
B. High gas pressure 
C. Low water level 
D. Low air pressure 
E. High limit
A

D. Low “air pressure”

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10
Q
  1. The Modulating fire control system uses _____ to control the combustion process.

A. Fuel on-off control
B. Air on-off control
C. Fixed air flow and variable fuel flow
D. Fixed fuel flow and variable air flow
E. Variable fuel/air flow

A

E. “Variable” fuel/air flow

Note: Variable

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11
Q

11.If the “pressure of the gas” supplied to the burner increases beyond the maximum required for safe combustion the _____ switch will de-energize the fuel valve.

A. Low gas pressure 
B. High gas pressure 
C. Low water level 
D. Low air pressure 
E. High limit
A

B. High gas pressure

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12
Q
  1. Damper position switches are found on boilers with the following burner control systems:
  2. On-Off control
  3. High-Low control
  4. Modulating control
  5. High Limit control
A. 1, 2 
B. 2, 3 
C. 3, 4 
D. 4, 5 
E. 1, 3
A

B. 2, 3

High Low,Modulating Control

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13
Q
  1. The high limit control can be tested by:

A. Closing the main gas valve quickly
B. Slowly covering the air supply to the fan
C. Slowly raising the boiler pressure above the operating setpoint
D. Slowly closing the main gas valve
E. Quickly closing the main burner shut-off valve

A

C. Slowly raising the boiler pressure above the operating setpoint

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14
Q
  1. The On-Off method of steam heating boiler burner control uses the _____ as the sensed variable.
A. Boiler steam pressure 
B. Boiler steam temperature 
C. Feedwater pressure 
D. Drum water level 
E. Boiler steam flow
A

A. Boiler steam pressure

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15
Q
  1. The “high gas pressure” cut-off switch can be tested by:

A. Closing the main gas valve quickly
B. Slowly covering the air supply to the fan
C. Slowly raising the boiler pressure above the operating setpoint
D. Slowly closing the main gas valve
E. Quickly closing the main burner shut-off valve

A

E. “Quickly closing” the main burner shut-off valve

Note: High Gas Pressure”

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16
Q
  1. Controls found on heating boilers include:
  2. Operating controls
  3. Pressure relief controls
  4. High limit cut-off switches
  5. Condensate level controls
  6. Low limit cut-off switches
A. 1, 2, 3 
B. 2, 3, 4 
C. 3, 4, 5.  
D. 1, 3, 5 
E. 3, 4, 5
A

D. 1, 3, 5

Operating,High Limit,Low Limit

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

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