PanGlobal Practice Test Flashcards
A type of boiler is constructed with ______ drums.
3
The crown sheet of a locomotive boiler was held in place by __________.
Radicals Stays
The combustion chamber of the serpentine water tube is located ___________.
Below the water tube
On portable locomotive boilers (Railroad Units) there was often a draft inducer located in the ________.
Uptake
The top of the boiler in a locomotive boiler was termed the _________
Crown sheet
The cylindrical portion of the locomotive boiler that connected the furnace to the smoke box as termed the___________.
Barrel
The uptake area of a locomotive boiler was often equipped with a ____________.
Damper for combustion control
The D type boiler is connected with ________ drums.
2
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 __________ from the time of start up.
15 to 30 seconds
This scanner is mounted as close to the flame as physically possible without subjecting it to a temperature over __________.
100oC (212oF)
At normal boiler steaming rates, a condensate receiver tank should contain a sufficient volume of water equivalent to the water evaporated by the boiler for a maximum period of ________.
30 minutes
An Automatic/manual selector switch is provided on a boiler with the following burner control system __________.
Modulating fire control
A photoelectric cell reacts to the ______________ emitted by the flame.
Ultraviolet rays and infrared rays
Before a steam or hot water boiler can be started by a programming control, all but one of the following conditions must be fulfilled.
All manually operated valves in the fuel lines to the pilot and main turned must be closed.
The inspectors test gauge is used to _____________.
Confirmed the pressure shown on the boiler pressure gauge
The blowdown tank is/does is ____________.
Not require on a low pressure boiler
The maximum operating temperature of a hot water boiler should never exceed
121oC (250’F)
Tubes adjacent to soot blowers are examined for signs of______________.
EROSION
Thermal shock occurs when metal is subjected to a sidden change in temperature, the temperature change will not be even throughout the metal
Expansion and construction will not be equal in all parts of the metal.
When a steam boiler has to be taken out of service give it a good blowndown to remove as much sediments as possible stop when the drain runs cleaner. Refill boiler to the top of the glass maintaining the boiler water temperature above___________ for about one hour to release all the dissolved gases.
85oC (185oF)
Operating temperature below _____________ of a hot water boiler are often avoided to prevent flue gas condensation
77oC (170oF)
The dye penetrant, entrapped in a crack, is brought to the surface by the action of the ____________.
Developer
When removing a hot water boiler from service open the blow-off or drain valve on the bottom of the boiler to remove any sediment that may have collected stopping when the ______________.
Water runs clear
When a cold oil fired boiler is started up the operator may notice that during the firts part of the warm-up period the stock will smoke slightly due to_____________.
The furnace temperature not being high enough to vaporize the incoming fuel oil immediately and completely.
Natural draft is created by the difference in ___________
Densities between cold and air & hot fuel gases.
The draft created by the fan can be controlled by the use of ________________.
Inlet dampers
If the combustion is complete the the SULPHUR will combine with the oxygen to produce ________________ plus heat. If complete - DIOXIDE
Incomplete- MONOXIDE
Sulphur Dioxide
If the combustion is complete the HYDROGEN will combine with the oxgyen to produce ______________ plus heat.
Some left over hydrogen
An important factor applicable to automatic fuel valves is positive ___________.
Positive shut-off
The amount of air in excess of the theoretical air 12kg (26.5lb) is 6kg (13.2lb) express as a percentage of the theoretical air this would be __________.
50%
The components of coal that combustible are ___________.
Carbon, hydrogen and Sulphur
An advantage of the forced draft fan over the induced draft fan is that the forced draft fan ____________.
Handles lower volumes of gases.
The service temperature of REFLECTIVE METAL INSULATION is above ________.
1040oC (1904oF)
The VALVE GLAND contains the ________
Packing
One inch of water is equivalent to:
0.036 psi (0.25 kPa)
If the combustion is incomplete the carbon will combine with oxygen to produce ______plus heat.
Carbon monoxide
The average heating value of Propane is:
93,150kJ/m3 (2,500 Btu/ft3)
If the combustion is incomplete the hydrogen will combine with the oxygen to produce ________ plus heat.
Some left over hydrogen
A chimney is necessary to:
To increase the concentration of pollutants
Viscosity is a measure of the ________of the oil.
Internal resistance flow
If the combustion is complete the hydrogen will combine with the oxygen to produce _______plus heat.
Water Vapour
A U-tube draft gauge is also known as:
Manometer
The service temperature limit of Glass Fibre insulation is:
454C (850F)
The service temperature limit of Calcium Silicate insulation is:
650C (1200F)
The service temperature limit of Mineral Fiber ( Rock and slag Wool) insulation is:
1038F (1900F)
