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WorksheetsCombustion Quiz II
Total questions: 25
Worksheet time: 13mins
The purpose of a combustion control system is to:
Automatically adjust firing rate to match load demand
Monitor firing rate and adjust feed water flow
Automatically adjust air for combustion
A combustion control system regulates:
Steam flow and pressure
Fuel and air supply
Fuel supply, air supply, and fuel to air ratio
The four most common combustion control systems are:
On-off, modulating, ratio control, feedback loop
On-off, positioning, modulating, metering
On-off, modulating, positioning, proportioning
The on-off combustion control system is controlled by:
Steam pressure sensor
Flow controller
Enthalpy controller
The modulating control combustion utilizes a ____ to control combustion rate:
Single modulating motor and linkages to forced draft and induced fans
Multiple modulating motors connected to forced and induced draft fans
Single-mod motor connected by linkage to the fuel control valve and control air damper
The most accurate system over a wide load range is the:
On-off control system
Metering control system
Modulating control system
The purpose of the flame safeguard system is:
Send signals to the programmer
Ensure the safe operation of the burner(s)
Monitor safety cut outs
The programmer is:
The "master-mind" of the burner control system
Used to control burn on-off function
Used to regulate the combustion process
The firing cycle is:
Set by the engineer or operator
A set order of functions which ensures the safe operation of the burner(s)
Regulates the fuel air feed rates over the range of load requirements
The responsible party to ensure the programmer is operating correctly is:
The CSD I contractor
The burner repair contractor
The licensed operator in responsible charge
The pre and post purge cycle exchanges approximately:
Two air changes to the furnace
Eight to ten air changes in furnace volume
Five changes in furnace volume
The purge proving switch may be:
"Sail" or differential pressure
Sail only by CSD I regulations
Pressure differential only
The period of time the Programmer allows the main fuel valves for gas to remain open to detect a flame are:
30 seconds
25 seconds
15 seconds
The period of time the Programmer allows the main fuel valves for heavy oil to remain open to detect a flame are:
30 seconds
25 seconds
15 seconds
The period of time the Programmer allows the pilot fuel valves to remain open to detect a flame are:
30 seconds
25 seconds
15 seconds
The flame scanner types are:
Flame rod, UV, Infrared, Photocell
Flame rod, UV, Photocell
Flame Rod, Infrared, Photocell
The flame detector which utilizes small amounts of current to be conducted by a flame is:
Flame Rod
UV
Infrared
Natural draft is based on the principle of pressure differential:
Created by hot air
Cold air
Differential density of columns of air at different temperatures
Natural draft is supplemented by:
Induced draft fans
Forced draft fans
Either forced or induced draft fans
Draft is pressure:
Above atmospheric
Below atmospheric
Either above or below atmospheric
One inch of water column is:
.036 psiA
.036psiG
.433psiG
A variable frequency drive operates on the variable(s) of:
Frequency and pairs of poles in motor
Frequency and poles in the motor
Frequency
Plate and tubular air pre-heaters are examples of:
Recuperative type
Regenerative type
Static type
Large utility boilers generally utilize:
Forced draft fans
Induced draft fans
Forced and induced fans working in balance
Induced draft fans are:
Equal in size to force draft fans
Larger than forced draft fans
Either larger or same size depending on type of fuel and draft requirement
