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Book 1 PanGlobal Assessment Test Unit One: Boiler Details (5th Class Power Engr) > Unit 4 Review Fuel and Combustion Self-Assessmen > Flashcards

Unit 4 Review Fuel and Combustion Self-Assessmen Flashcards

1
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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2
Q

2.The air atomizing burner uses compressed air at about 100 kPa (15 psi) as atomizing air also called _____ air.

A. Secondary

B. Tertiary

C. Primary

D. Over fire

E. Combustion

A

C. Primary

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3
Q

3.The operation of a system with two or three fixed capacity nozzles is controlled by the operating pressure or temperature control on the boiler on an _____ cycle.

A. Air flow fuel flow

B. Modulating

C. Seam flow fuel flow

D. On-off

E. Low-high-Low

A

E. Low-high-Low

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4
Q

4.Natural draft is created by the difference in:

A. Densities between cold air and hot flue gases

B. Temperatures between cold air and hot flue gases

C. Densities between cold flue gases and hot air

D. Temperatures between cold flue gases and hot air

E. Pressures between cold air and hot flue gases

A

A. Densities between cold air and hot flue gases

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5
Q

5.Atomizing Air (AA) is:

A. The air used to create a “sharing action on the fuel within the burner

B. Also called combustion air

C. The air used to ensure complete combustion

D. Also called secondary air

E. Also called tertiary air

A

A. The air used to create a “sharing action on the fuel within the burner

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6
Q

6.An important factor applicable to automatic fuel valves is:

A. Negative shutoff

B. Fast opening

C. Slow closing

D. Positive shutoff

E. Positive opening

A

D. Positive shutoff

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7
Q

7.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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8
Q

8.A gas burner may be classified as a _____ burner.

A. Premix

B. After mix

C. Ring

D. Spud

E. Power

A

E. Power

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9
Q

9.The oil is supplied to the burner mechanical atomizing nozzle under high pressure of about:

A. 100 kPa (15 psi)

B. 200 kPa (29 psi)

C. 500 kPa (75 psi)

D. 700 kPa (100 psi)

E. 1000 KPa (145 psi)

A

D. 700 kPa (100 psi)

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10
Q

10.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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11
Q

11.When the control relay starts the burner motor on demand for heat, it allows a purging cycle of _____ seconds then it energizes the igniter.

A. 15-20

B. 5-10

C. 5-15

D. 0-5

E. 10-15

A

E. 10-15

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12
Q

12.The average heating value of Butane 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

B. 122,200 kJ/m³ (3,280 Btu/ft³)

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13
Q

13.A ‘‘liquid fuel’’ used in a boilers could be:

A. Coal

B. Fuel oil

C. Wood

D. Natural gas

E. Propane

A

B. Fuel oil

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14
Q

14.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

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15
Q

15.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’’

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16
Q

16.The draft created by the fan can be controlled by the:

A. Speed of the dampers

B. Use of inlet dampers

C. Height of the stack

D. Temperature of the flue gases

E. Amount of fuel supplied

A

B. Use of inlet dampers

17
Q

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

A. Methane

B. Ethane

C. Propane

D. Butane

E. Hydrogen sulphide

A

A. Methane

18
Q

18.To ensure complete combustion of the fuel in the furnace one of the following conditions must be fulfilled.

A. Enough air must be supplied to the furnace to provide sufficient nitrogen to combine with all the combustible elements of the fuel

B. The air and the fuel must be thoroughly mixed together so that each particle of fuel can come in contact with the necessary nitrogen

C. The temperature in the furnace must be high enough to ignite the fuel as it enters

D. The furnace must be small enough to allow sufficient time for the combustion to be completed before the gases strike the cooler areas of the heating surfaces

E. The fuel must be in the solid state

A

B. The ‘‘air and the fuel must be thoroughly mixed’’ together so that each particle of fuel can come in contact with the necessary nitrogen

19
Q

19.The amount of air required to supply just enough oxygen for complete combustion is called:

A. Primary air

B. Theoretical air

C. Excess air

D. Tertiary air

E. Secondary air

A

B. Theoretical air

20
Q

20.The average heating value of Natural Gas 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

E. 37,260 kJ/m³ (1,000 Btu/ft³)

21
Q

21.A ‘‘disadvantage of a refractory burner’’ is:

A. Its higher cost

B. The gas and air mixture is thoroughly preheated before it enters the furnace

C. The metal burner parts are exposed to high temperatures

D. The short luminous flame spreads over a large cross-section of the furnace resulting in high radiant heat transfer

E. It is a simple design

A

A. Its higher cost

‘‘disadvantage of a refractory burner’’

22
Q

22.The diaphragm gas valve has a two-way pilot valve that:

A. On shutdown opens a bleed port and closes an opening port

B. Allows supply pressure gas to flow to the bottom of the diaphragm closing chamber and hold the main valve closed

C. allows supply pressure gas to flow to the top of the diaphragm closing chamber and hold the main valve open

D. allows supply pressure gas to flow to the bottom of the diaphragm closing chamber and hold the main valve open

E. On shutdown closes a bleed port and opens a closing port

A

A. On shutdown opens a bleed port and closes an opening port

23
Q

23.The operation of a single fixed capacity high-pressure atomizing burner is controlled by the operating pressure or temperature control on the boiler on an _____ cycle.

A. Air flow fuel flow

B. Low-high-Low

C. Seam flow fuel flow

D. On-off

E. Modulating

A

D. On-off

24
Q

24.An intermittent pilot:

A. Burns at all times

B. Is automatically ignited at the start of each burner operation and continues to burn throughout the main burner period

C. Is used to light off the main burner but does not burn throughout the burner period

D. Is manually ignited

E. Can act as the main burner

A

B. Is automatically ignited at the start of each burner operation and continues to burn throughout the main burner period

25
Q

25.Viscosity is a measure of the _____ of the oil.

A. Weight

B. Internal resistance to flow

C. Lubricating quality

D. Density

E. Grad

A

B. Internal resistance to flow

26
Q

26.The ‘‘time-delay oil valve’’ is adjusted to open automatically and allow oil flow to the burner from _____ seconds after the start of the igniter.

A. 5-15

B. 5-10

C. 15-20

D. 10-15

E. 0-5

A

C. 15-20

27
Q

27.The pump type motorized gas valve uses a hydraulic oil pump to:

A. Close the gas valve quickly

B. Close the gas valve slowly

C. Open the gas valve slowly

D. Open the gas valve quickly

E. Lubricate the gas valve

A

C. Open the gas valve slowly

28
Q

28.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)

29
Q

29.The amount of air required to supply just enough oxygen for complete combustion is called:

A. Primary air

B. Theoretical air

C. Excess air

D. Tertiary air

E. Secondary air

A

B. Theoretical air

30
Q

30.The operation of a system with ‘‘two or three fixed’’ capacity nozzles is controlled by the operating pressure or temperature control on the boiler on an _____ cycle.

A. Air flow fuel flow

B. Modulating

C. Seam flow fuel flow

D. On-of

E. Low-high-Low

A

E. Low-high-Low

31
Q

31.One type of pilot burner is called the _____ pilot.

A. After mix

B. Premix

C. Continuous

D. Atmospheric

E. Power

A

C. Continuous

32
Q

32.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. Highest temperature

B. Lowest Pressure

C. Lowest temperature

D. Highest pressure

E. Auto ignition temperature

A

C. Lowest temperature

33
Q

33.A ring burner is known as a/an _____ burner.

A. Atmospheric

B. After mix

C. Premix

D. Spud

E. Power

A

B. After mix

34
Q

34.One mm of water is equivalent to:

A. 9.81 Pa (0.0014 psi)

B. 9.81 kPa (14.2 psi)

C. 101.3 kPa (14.7 psi)

D. 1 kPa (0.145 psi)

E. 1 Pa (0.00014 psi

A

A. 9.81 Pa (0.0014 psi)

35
Q

35.A ‘‘continuous pilot’’ or standing pilot:

A. Burns at all times

B. Is automatically ignited

C. Is automatically ignited at the start of each burner operation and continues to burn throughout the main burner period

D. Is used to light off the main burner but does not burn throughout the burner period

E. Can act as the main burner

A

A. Burns at all times

‘‘continuous pilot’’

36
Q

36.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

37
Q
  1. The components of coal that are combustible are:
  2. Carbon
  3. Hydrogen
  4. Oxygen
  5. Sulphur
  6. Nitrogen
  7. Moisture
  8. Ash

A. 1, 2, 3

B. 2, 3, 4

C. 3, 4, 7

D. 1, 2, 4

E. 2, 4, 6

A

D. 1, 2, 4

  1. Carbon
  2. Hydrogen
  3. Sulphur

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

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