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Book 1 PanGlobal Assessment Test Unit One: Boiler Details (5th Class Power Engr) > Chapter 13 Combustion & Draft > Flashcards

Chapter 13 Combustion & Draft Flashcards

1
Q
  1. One inch of water is equivalent to:

A. 0.36 psi (2.46 kPa)

B. 0.036 psi (0.25 kPa)

C. 14.7 psi (101.4 kPa)

D. 0.145 psi (1.0 kPa)

E. 0.00014 psi (0.0009 Pa)

A

B. 0.036 psi (0.25 kPa)

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2
Q
  1. If the combustion is incomplete the carbon will combine with the oxygen to produce _____ plus heat.

A. Carbon monoxide

B. Carbon dioxide

C. Sulphur dioxide

D. Sulphur monoxide

E. Water vapour

A

A. Carbon monoxide

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3
Q
  1. The average heating value of Propane is:

A. 93,150 kJ/m³ (2,500 Btu/ft³)

B. 122,200 kJ/m³ (3,280 Btu/ft³)

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

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

E. 37,260 kJ/m³ (1,000 Btu/ft³)

A

A. 93,150 kJ/m³ (2,500 Btu/ft³)

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4
Q
  1. If the combustion is incomplete the hydrogen will combine with the oxygen to produce _____ plus heat.

A. Hydrogen monoxide

B. Carbon dioxide

C. Hydrogen dioxide

D. Sulphur monoxide

E. Some left over hydrogen

A

E. Some left over hydrogen

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5
Q
  1. A chimney is necessary to:

A. Decrease combustion temperatures

B. To increase the concentration of pollutants

C. Disperse pollutants over a wider area

D. Increase combustion temperatures

E. Decrease combustion air flow

A

B. To increase the concentration of pollutants

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6
Q
  1. Viscosity is a measure of the _____ of the oil.

A. Weight

B. Internal resistance to flow

C. Lubricating quality

D. Density

E. Grade

A

B. Internal resistance to flow(VISCOSITY)

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7
Q
  1. The ‘‘natural draft’’ created by differential pressure can be changed by:

A. Decreasing the density of the air

B. Increasing the density of the air

C. Increasing the density of the flue gas

D. Decreasing the height of the stack

E. Increasing the density of the fuel

A

B. ‘‘Increasing’’ the density of the air

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8
Q
  1. If the combustion is complete the hydrogen will combine with the oxygen to produce _____ plus heat.

A. Carbon monoxide

B. Carbon dioxide

C. Sulphur dioxide

D. Sulphur monoxide

E. Water vapour

A

E. Water vapour

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9
Q
  1. The forced draft fan is used to force:

A. Combustion air into the stack

B. Combustion produces into the stack

C. Flue gases into the furnace

D. Flue gases into the stack

E. Combustion air into the furnace

A

E. Combustion air into the furnace

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10
Q
  1. A U-tube draft gauge is also known as a:

A. Thermometer

B. Psychrometer

C. Manometer

D. Pressure gauge

E. Viscometer

A

C. ‘‘Manometer’’

Note: Is a ‘‘U-Tube’’ Draft Gauge

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11
Q
  1. A liquid fuel used in a boilers could be:

A. Coal

B. Fuel oils

C. Wood

D. Natural gas

E. Propane

A

B. Fuel oils

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12
Q
  1. If the combustion is incomplete the sulphur will combine with the oxygen to produce _____ plus heat.

A. Carbon monoxide

B. Carbon dioxide

C. Sulphur dioxide
D. Sulphur monoxide
E. Water vapour

A

D. Sulphur monoxide

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13
Q
  1. If the combustion is complete the sulphur will combine with the oxygen to produce _____ plus heat.

A. Carbon monoxide

B. Carbon dioxide

C. Sulphur dioxide

D. Sulphur monoxide

E. Water vapour

A

C. Sulphur dioxide

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14
Q
  1. The draft required for heating boilers is usually quite small and in the SI system it is often measured and expressed in:

A. Centimetres of water head

B. Millimetres of mercury head

C. Inches of water head

D. Inches of mercury head

E. Millimetres of water head

A

E. Millimetres of water head

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15
Q
  1. 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:

A. Increased heat transfer

B. Lower furnace temperatures

C. Lower steam production

D. Decreased fuel consumption

E. The possibility of a disastrous explosion

A

E. The possibility of a disastrous explosion

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16
Q
  1. A gaseous fuel used in a boilers could be:

A. Coal

B. Fuel oils

C. Natural gas

D. Wood

E. Diesel fuel

A

C. Natural gas

Ris Ipsa Loquitor

17
Q
  1. 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.

A. 1/150th

B. 1/120th

C. 1/100th

D. 1/12th

E. 1/10th

A

B. 1/120th

18
Q
  1. The ‘‘incomplete combustion of carbon’’ results in the formation of:

A. Carbon tetrachloride

B. Bicarbonate

C. Carbon dioxide

D. Carbon trioxide

E. Carbon monoxide

A

E. Carbon monoxide

19
Q
  1. The ‘‘component of natural gas’’ that occupies 80%-90% is:

A. Methane

B. Ethane

C. Propane

D. Butane

E. Hydrogen sulphide

A

A. Methane

20
Q
  1. On larger boilers both forced draft and induced draft fans are used for better control of:

A. Furnace pressure

B. Combustion air

C. Flue gases

D. Air volumes

B. Fuel volumes

A

A. Furnace pressure

21
Q
  1. The average heating value of coal (bituminous) is:

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

B. 37,260 kJ/m³ (1,000 Btu/ft³)

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

D. 93,150 kJ/m³ (2,500 Btu/ft³)

E. 122,200 kJ/m³ (3,280 Btu/ft³)

A

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

22
Q
  1. In order to check the combustion process the flue gas is analyzed for _____ one of the combustion products.

A. SO2

B. O2

C. SO

D. NO2

E. N2

A

B. O2

23
Q
  1. In buildings the fuels that are widely used are:
  2. Oil
  3. Coal
  4. Natural gas
  5. Hog fuel
  6. Garbage

A. 1, 2

B. 1, 2, 3

C. 1, 3

D. 2, 4

E. 2, 3, 5

A

C. 1, 3

Oil and Natural Gas

Book 1 PanGlobal Assessment Test Unit One: Boiler Details (5th Class Power Engr) (24 decks)

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