Book 1: 4-13 "Combustion & Draft"

Question 1

In order to check the combustion process the flue gas is analyzed for _____ one of the combustion products.
Select one:

A. N2

B. SO

C. SO2

D. NO2

E. O2

Answer 1

E. O2

Question 2

Fuel oils have an advantage over coal as a boiler fuel in that:
Select one:

A. Oil is more expensive than coal

B. It burns more cleanly (less residuals)

C. More storage space is required

D. More handling equipment and labour is required

E. The amount fed to the furnace is more difficult to control

Answer 2

B. It burns more cleanly (less residuals)

Question 3

The amount of air required for complete combustion is more than the theoretical air and is called:
Select one:

A. Excess air

B. Primary air

C. Tertiary air

D. Theoretical air

E. Secondary air

Answer 3

A. Excess air

Question 4

Propane as a liquid takes as little as _____ of the space it needs as a gas, making it easy to store and transport and then burn as a gas.
Select one:

A. 1/150th

B. 1/10th

C. 1/120th

D. 1/12th

E. 1/100th

Answer 4

C. 1/120th

Question 5

If the combustion is complete the hydrogen will combine with the oxygen to produce _____ plus heat.
Select one:

A. Carbon monoxide

B. Water vapour

C. Carbon dioxide

D. Sulphur monoxide

E. Sulphur dioxide

Answer 5

B. Water vapour

Question 6

A liquid fuel used in a boilers could be:
Select one:

A. Coal

B. Wood

C. Fuel oils

D. Natural gas

E. Propane

Answer 6

C. Fuel oils

Question 7

The incomplete combustion of carbon results in the formation of:
Select one:

A. Carbon tetrachloride

B. Carbon dioxide

C. Carbon monoxide

D. Carbon trioxide

E. Bicarbonate

Answer 7

C. Carbon monoxide

Question 8

One mm of water is equivalent to:
Select one:

A. 1 kPa (0.145 psi)

B. 101.3 kPa (14.7 psi)

C. 1 Pa (0.00014 psi)

D. 9.81 Pa (0.0014 psi)

E. 9.81 kPa (14.2 psi)

Answer 8

D. 9.81 Pa (0.0014 psi)

Question 9

Viscosity is a measure of the _____ of the oil.
Select one:

A. Grade

B. Internal resistance to flow

C. Density

D. Lubricating quality

E. Weight

Answer 9

B. Internal resistance to flow

Question 10

The draft created by the fan can be controlled by the:
Select one:

A. Speed of the dampers

B. Temperature of the flue gases

C. Amount of fuel supplied

D. Use of inlet dampers

E. Height of the stack

Answer 10

D. Use of inlet dampers

Question 11

The average heating value of coal (bituminous) is:
Select one:

A. 25 600 kJ/kg (11,000 Btu/lb)

B. 45,360 kJ/kg (19,500 Btu/lb)

C. 122,200 kJ/m³ (3,280 Btu/ft³)

D. 93,150 kJ/m³ (2,500 Btu/ft³)

E. 37,260 kJ/m³ (1,000 Btu/ft³)

Answer 11

A. 25 600 kJ/kg (11,000 Btu/lb)

Question 12

A shortage of combustion air will result in the incomplete combustion of the fuel that could cause the formation of soot on the heating surfaces leading to:
Select one:

A. Lower steam production

B. The possibility of a disastrous explosion

C. Decreased fuel consumption

D. Increased heat transfer

E. Lower furnace temperatures

Answer 12

B. The possibility of a disastrous explosion

Question 13

The component of natural gas that occupies 10%-20% is:
Select one:

A. Hydrogen sulphide

B. Ethane

C. Methane

D. Propane

E. Butane

Answer 13

B. Ethane

Question 14

The forced draft fan is used to force:
Select one:

A. Combustion air into the stack

B. Combustion air into the furnace

C. Combustion produces into the stack

D. Flue gases into the furnace

E. Flue gases into the stack

Answer 14

B. Combustion air into the furnace

Question 15

Air is composed of mostly:
Select one:

A. Helium

B. Carbon dioxide

C. Smog

D. Oxygen

E. Nitrogen

Answer 15

E. Nitrogen

Question 16

If the combustion is incomplete the sulphur will combine with the oxygen to produce _____ plus heat.
Select one:

A. Carbon dioxide

B. Sulphur monoxide

C. Water vapour

D. Sulphur dioxide

E. Carbon monoxide

Answer 16

B. Sulphur monoxide

Question 17

An advantage of the forced draft fan over the induced draft fan is that the forced draft fan:
Select one:

A. Handles lower volumes of gases

B. Endures higher temperatures

C. Requires more expensive materials

D. Handles the fuel fed to the burner

E. Handles hot air only

Answer 17

A. Handles lower volumes of gases

Question 18

The term Relative Density (specific gravity) means:
Select one:

A. The ratio of the mass of a certain volume of oil to the volume of an equal mass of water

B. The ratio of the mass of a certain volume of water to the mass of an equal volume of water

C. The ratio of the volume of a certain mass of oil to the mass of an equal volume of water

D. The ratio of the mass of a certain volume of oil to the mass of an equal mass of oil

E. The ratio of the mass of a certain volume of oil to the mass of an equal volume of water

Answer 18

E. The ratio of the mass of a certain volume of oil to the mass of an equal volume of water

Question 19

The average heating value of Fuel Oil (light) is:
Select one:

A. 37,260 kJ/m³ (1,000 Btu/ft³)

B. 93,150 kJ/m³ (2,500 Btu/ft³)

C. 122,200 kJ/m³ (3,280 Btu/ft³)

D. 45,360 kJ/kg (19,500 Btu/lb)

E. 25 600 kJ/kg (11,000 Btu/lb)

Answer 19

D. 45,360 kJ/kg (19,500 Btu/lb)

Question 20

In buildings the fuels that are widely used are:
1. Oil
2. Coal
3. Natural gas
4. Hog fuel
5. Garbage
Select one:

A. 1, 3

B. 2, 4

C. 2, 3, 5

D. 1, 2

E. 1, 2, 3

Answer 20

A. 1, 3

Question 21

The average heating value of Butane is:
Select one:

A. 122,200 kJ/m³ (3,280 Btu/ft³)

B. 37,260 kJ/m³ (1,000 Btu/ft³)

C. 93,150 kJ/m³ (2,500 Btu/ft³)

D. 45,360 kJ/kg (19,500 Btu/lb)

E. 25 600 kJ/kg (11,000 Btu/lb)

Answer 21

A. 122,200 kJ/m³ (3,280 Btu/ft³)

Question 22

The natural draft created by differential pressure can be changed by:
Select one:

A. Decreasing the height of the stack

B. Increasing the density of the air

C. Increasing the density of the fuel

D. Increasing the density of the flue gas

E. Decreasing the density of the air

Answer 22

B. Increasing the density of the air

Question 23

A U-tube draft gauge is also known as a:
Select one:

A. Viscometer

B. Thermometer

C. Manometer

D. Psychrometer

E. Pressure gauge

Answer 23

C. Manometer

Question 24

Too much excess air will cause:
Select one:

A. Lower theoretical air

B. Lower firing rates

C. Lower the stack temperature

D. Large amounts of heat out through the stack

E. The efficiency of the boiler to increase

Answer 24

D. Large amounts of heat out through the stack

Question 25

If the combustion is complete the carbon will combine with the oxygen to produce _____ plus heat.
Select one:

A. Sulphur monoxide

B. Carbon monoxide

C. Water vapour

D. Carbon dioxide

E. Sulphur dioxide

Answer 25

D. Carbon dioxide

Question 26

The amount of air in excess of the theoretical air 12 kg (26.5 lb) is 6 kg (13.2 lb) expressed as a percentage of the theoretical air this would be:
Select one:

A. 50%

B. 20%

C. 30%

D. 10%

E. 15%

Answer 26

A. 50%

Question 27

The average heating value of Propane is:
Select one:

A. 37,260 kJ/m³ (1,000 Btu/ft³)

B. 93,150 kJ/m³ (2,500 Btu/ft³)

C. 25 600 kJ/kg (11,000 Btu/lb)

D. 122,200 kJ/m³ (3,280 Btu/ft³)

E. 45,360 kJ/kg (19,500 Btu/lb)

Answer 27

B. 93,150 kJ/m³ (2,500 Btu/ft³)

Question 28

The average heating value of Natural Gas is:
Select one:

A. 37,260 kJ/m³ (1,000 Btu/ft³)

B. 45,360 kJ/kg (19,500 Btu/lb)

C. 122,200 kJ/m³ (3,280 Btu/ft³)

D. 25 600 kJ/kg (11,000 Btu/lb)

E. 93,150 kJ/m³ (2,500 Btu/ft³)

Answer 28

A. 37,260 kJ/m³ (1,000 Btu/ft³)

Question 29

If the combustion is incomplete the hydrogen will combine with the oxygen to produce _____ plus heat.
Select one:

A. Carbon dioxide

B. Hydrogen dioxide

C. Some left over hydrogen

D. Hydrogen monoxide

E. Sulphur monoxide

Answer 29

C. Some left over hydrogen

Question 30

One inch of water is equivalent to:
Select one:

A. 14.7 psi (101.4 kPa)

B. 0.36 psi (2.46 kPa)

C. 0.145 psi (1.0 kPa)

D. 0.036 psi (0.25 kPa)

E. 0.00014 psi (0.0009 Pa)

Answer 30

D. 0.036 psi (0.25 kPa)