Book 1 Unit 4 Flashcards
An advantage of natural gas as a boiler fuel is:
A) A large storage space is required
B) The amount fed to the furnace is difficult to control
C) More ash is produced when gas is burned
D) It is difficult to mix with air
E) Little handling equipment is required
E) Little handling equipment is required
The average heating value of Natural gas is:
A) 122,200kJ/m3 (3,280 Btu/ft3)
B) 25,600 kJ/m3 (11,000 Btu/ft3)
C) 93,150 kJ/m3 (2,500 Btu/ft3)
D) 37,260 kJ/m3 (1,000 Btu/ft3)
E) 45,360 kJ/m3 (19,500 Btu/ft3)
D) 37,260 kJ/m3 (1,000 Btu/ft3)
The highest oil level in the tank should be less than _______ above the burner.
A) 8.9m (29.2 ft)
B) 12.6 m (41.3 ft)
C) 7.6 m (24.9 ft)
D) 2.4 m (7.9 ft)
E) 3.4 m (11.2 ft)
C) 7.6 m (24.9 ft)
If the combustion is incomplete the hydrogen will combine with the oxygen to produce ______ plus heat.
A) Some left over hydrogen
B) Hydrogen dioxide
C) Sulphur monoxide
D) Carbon dioxide
E) Hydrogen monoxide
A) Some left over hyrogen
A solid fuel used in a boiler could be:
A) Natural gas
B) Fuel oils
C) Propane
D) Coal
E) Gasoline
D) Coal
The inclined draft gauge is highly accurate for the measurement of:
A) Large pressure fluctuations
B) Large temperature changes
C) Slight density variations
D) Small temperature changes
E) Slight pressure fluctuations
E) Slight pressure fluctuations
The air atomizing burner uses compressed air at about 100 kPa (15psi) as atomizing air also called _______ air.
A) Over fire
B) Primary
C) Combustion
D) Tertiary
E) Secondary
B) Primary
A gas burner may be classified as a ______ burner.
A) Spud
B) After mix
C) Ring
D) Power
E) Premix
D) Power
The amount of air in excess of the theoretical air is 12 kg (26.5 lb) is 6 kg (13.2 lbs) expressed as a percentage of the theoretical air this would be:
A) 50%
B) 15%
C) 20%
D) 30%
E) 10%
A) 50%
A ring burner is known as a/an _______ burner.
A) Atmospheric
B) Aftermix
C) Premix
D) Power
E) Spud
B) After mix
Secondary Air (SA) is:
A) Also called flue gas
B) Also called combustion air
C) The second air to contact the fuel when primary air is involved
D) The air used to create a “shearing” action on the fuel within the burner
E) Also called tertiary air
C) The second air to contact the fuel when primary air is involved
Upon activation the two-way pilot valve in the diaphragm gas valve switches so that the:
A) Supply port closes and the bleed port opens
B) The supply pressure acting on top of the diaphragm forces it up
C) The supply pressure acting on bottom of the diaphragm forces it up
D) Supply port opens and the bleed port closes
E) Supply port opens and the bleed port opens
A) Supply port closes and the bleed port opens
The flash point is the _______ at which the fuel oil gives off enough vapour to ignite when exposed to an open flame but not continue to burn.
A) Lowest pressure
B) Lowest temperature
C) Auto ignition temperature
D) Highest pressure
E) Highest temperature
B) Lowest temperature
The diaphragm gas valve has a two-way pilot valve that:
A) Allows supply pressure gas to flow to the top of the diaphragm closing chamber and hold the main valve open
B) On shutdown closes a bleed port and opens a closing port
C) Allows supply pressure gas to flow to the bottom of the diaphragm closing chamber and hold the main valve closed
D) On shutdown opens a bleed port and closes an opening port
E) Allows supply pressure gas to flow to the bottom of the diaphragm closing chamber and hold the main valve open
B) On shutdown closes a bleed port and opens a closing port
The oil is supplied to the burner mechanical atomizing nozzle under high pressure of about:
A) 200 kPa (29 psi)
B) 1000 kPa (145 psi)
C) 700 kPa (100 psi)
D) 500 kPa (75 psi)
E) 100 kPa (15 psi)
C) 700 kPa (100 psi)
