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Boilers > Steam Boilers Module 15 Session 10 > Flashcards

Steam Boilers Module 15 Session 10 Flashcards

1
Q

The primary function of a combustion control is to ensure ____________.
A. Safe boiler operation
B. Boiler efficiency
C. Safe and efficient boiler operation
D. Temperature regulation of the gases of combustion

A

C. Safe and efficient boiler operation

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2
Q

The ON/OFF control system is usually found on ____________.
A. Boilers with large fluctuating loads
B. Package fire tube boilers
C. Boilers with high steam demand but constant load
D. Low pressure boilers only

A

C. Boilers with high steam demand but constant load

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3
Q

The purpose of the boiler pressure control found in the ON/OFF control system is to ____________.
A. Regulate steam flow
B. Start and stop air flow
C. Regulate fuel flow
D. Start and stop the burner on steam pressure demand

A

D. Start and stop the burner on steam pressure demand

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4
Q

The ON/OFF pressure control must be connected to the ____________.
A. Main steam line
B. Main feedwater line
C. Highest part of the steam side of the boiler
D. Water side of the boiler below the NOWL

A

C. Highest part of the steam side of the boiler

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5
Q 
A steam siphon ensures that \_\_\_\_\_\_\_\_\_\_\_\_ does not enter the boiler pressure control.
A. Steam 
B. Water
C. Air
D. Gas
A

A. Steam

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6
Q 
A mercury-tube pressure control will only be accurate when it is installed \_\_\_\_\_\_\_\_\_\_\_\_.
A. At the NOWL
B. Below the NOWL
C. In a vertical position
D. In a horizontal position
A

C. In a vertical position

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7
Q

The four elements that must be regulated in a combustion control system are
A. Fuel supply; air supply; ratio of air to fuel; removal of combustion gases
B. Fuel supply; water supply; air supply; ratio of water to fuel
C. Temperature of water; temperature of fuel; temperature of steam; temperature of exit gases
D. Pressure of water; pressure of steam; pressure of fuel; pressure of air

A

A. Fuel supply; air supply; ratio of air to fuel; removal of combustion gases

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8
Q

The two scales found on the boiler pressure control are used to ____________.
A. Set the operating steam pressure range of the boiler
B. Eliminate low water
C. Maintain high and low fire
D. Warn the operator of flame failure

A

A. Set the operating steam pressure range of the boiler

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9
Q

The purpose of the boiler modulating pressure control is to ____________.
A. Regulate the water flow
B. Prevent carryover
C. Start and stop the burner on steam pressure demand
D. Regulate the high and low firing rates of the burner

A

D. Regulate the high and low firing rates of the burner

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10
Q

The modulating pressure control must be connected to the
A. Main steam line
B. Main feedwater line
C. Highest part of the steam side of the boiler
D. Water side of the boiler below the NOWL

A

C. Highest part of the steam side of the boiler

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11
Q 
The burner motor continues to operate after fuel is shut off to the burner during \_\_\_\_\_\_\_\_\_\_\_\_.
A. Post-purging
B. Pre-purging
C. Synchronization
D. Ignition light off
A

A. Post-purging

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12
Q

The programmer in the ON/OFF control system is used to ____________.
A. Control the burner firing cycle
B. Control the boiler operating range
C. Secure the burner in the event of low Water
D. Regulate the steam flow

A

A. Control the burner firing cycle

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13
Q 
To eliminate the danger of a furnace explosion during startup, the firing sequence must first allow for \_\_\_\_\_\_\_\_\_\_\_\_.
A. Pilot ignition
B. Proving the pilot
C. A pre-purge period
D. Proving the main flame
A

C. A pre-purge period

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14
Q 
The scanner is sensitive to
A. Heat
B. Temperature
C. Pressure
D. Infrared or ultraviolet rays
A

D. Infrared or ultraviolet rays

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15
Q

In the event of a flame failure, the programmer will ____________.
A. Go through a new firing cycle
B. Secure the fuel, purge the firebox, and then shut down
C. Vent the combustion chamber
D. Start the induced draft fan

A

B. Secure the fuel, purge the firebox, and then shut down

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16
Q 
The positioning combustion control system cannot function without \_\_\_\_\_\_\_\_\_\_\_\_ pressure.
A. Steam
B. Water
C. Air
D. Gas
A

A. Steam

17
Q 
The metering combustion control system is sensitive to changes in \_\_\_\_\_\_\_\_\_\_\_\_.
A. Boiler Water level
B. Firing rate
C. Steam flow and pressure
D. Viscosity of the fuel oil
A

C. Steam flow and pressure

18
Q

Combustion air is controlled by ____________.
A. Inlet dampers, fan intake vanes, and the fan speed
B. The outlet damper and fan speed
C. Starting and stopping the forced draft fan
D. Variations in control air pressure

A

A. Inlet dampers, fan intake vanes, and the fan speed

19
Q 
Gases of combustion are pulled from the boiler by the \_\_\_\_\_\_\_\_\_\_\_\_.
A. Forced draft fan
B. Induced draft fan
C. Variable-speed motor
D. Hydraulic couplings
A

B. Induced draft fan

20
Q 
The positioning combustion control system is sensitive to changes in the \_\_\_\_\_\_\_\_\_\_\_\_.
A. Boiler water level
B. Firing rate
C. Steam flow
D. Steam header pressure
A

D. Steam header pressure

21
Q 
The most common type of pressure control used is the type.
A. Mercury-tube
B. Microswitch
C. Pigtail
D. V-tube
A

A. Mercury-tube

22
Q 
Which of the following is a solid-state control system that usually supplements other stand-alone control systems such as pneumatic controls?
A. EMC
B. HVAC
C. DDC
D. PLC
A

A. EMC

23
Q 
Which of the following is a solid-state control system in which a building automation system controller is wired directly to controlled devices to turn them ON or OFF?
A. EMC
B. HVAC
C. DDC
D. PLC
A

C. DDC

24
Q 
Which of the following is a solid-state control system that is programmed to automatically control equipment or an industrial process?
A. EMC
B. HVAC
C. DDC
D. PLC
A

D. PLC

Boilers (10 decks)

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