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HIGH PRESSURE BOILERS > Steam Boilers Tech Check 6 > Flashcards

Steam Boilers Tech Check 6 Flashcards

1
Q

In order to burn 1 lb of fuel, approximately
lb of air are needed.

A. 8.3
B. 14.7
C. 15
D. 32.5

A

C. 15

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2
Q

Draft is measured in

A. pounds per square inch.
B. inches or tenths of an inch of a vertical water column
C. inches or tenths of an inch of mercury
D. ounces per square inch

A

B. inches or tenths of an inch of a vertical water column

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3
Q

Draft in the boiler is measured between two points such as the and

A. atmosphere; inside the boiler setting
B. chimney; breeching
C. breeching; firebox
D. boiler’s first pass; chimney

A

A. atmosphere; inside the boiler setting

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4
Q

Pressure at the discharge side of a forced draft fan is
atmospheric pressure.

A. balanced at
B. less than
C. the same as
D. greater than

A

D. greater than

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5
Q

To reduce the heat loss of flue gases going to the chimney, boilers are equipped with

A. open feed water heaters
B. superheaters
C. economizers and air heaters
D. baffles in uptakes

A

C. economizers and air heaters

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6
Q

The convection air heater employs a counterflow principle in which the gases of combustion

A. move down while air goes up
B. and air move in the same direction
C. move up while the air goes down
D. and air mix together

A

C. move up while the air goes down

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7
Q

Both air and flue gas temperatures are controlled by

A. increasing the firing rate
B. decreasing the firing rate
C. balancing the plant load
D. the use of bypass dampers

A

D. the use of bypass dampers

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8
Q

If the temperature of air entering the heater gets too low, it will cause

A. condensation on the gas side of the air heater
B. thermal shock to the heater
C. incomplete combustion
D. oxygen pitting

A

A. condensation on the gas side of the air heater

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9
Q

Air heaters must be cleaned to ensure good heat transfer by

A. wire brushing monthly
B. reversing air and gas flow
C. using soot blowers
D. having high pressure water used on the gas side

A

C. using soot blowers

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10
Q

Air heaters can most successfully be used in plants that

A. have a fluctuating steam load
B. have a fairly constant steam load
C. have high chimneys
D. burn only coal or fuel oil

A

B. have a fairly constant steam load

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11
Q

If air supplied for combustion mixes with gases of combustion, it could lead to

A. a loss of air for combustion and lower boiler efficiency
B. an increase in chimney temperature
C. an increase in combustion air temperature
D. higher boiler efficiency

A

A. a loss of air for combustion and lower boiler efficiency

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12
Q

A diaphragm draft gauge is calibrated in

A. pounds per square inch
B. feet of water
C. inches of water
D. inches of mercury

A

C. inches of water

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13
Q

Mechanical draft is produced by the

A. height of the chimney
B. diameter of the chimney
C. power-driven fans
D steam jets

A

C. power-driven fans

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14
Q

Mechanical draft can be classified as

A. pressurized
B, natural
C. regenerative
D. forced or induced

A

D. forced or induced

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15
Q

The amount of draft available in a natural draft system is dependent on the

A. diameter of the chimney
B. height of the chimney
C, fly ash in the gases of combustion
D. types of fans used

A

B. height of the chimney

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16
Q

The gases of combustion leaving a boiler that has natural draft are controlled by

A. outlet dampers
B. inlet dampers
C. higher firing rates
D, an induced draft fan

A

A. outlet dampers

17
Q

The induced draft fan is located

A. between the boiler and the chimney
B. at the base of the chimney
C. at the burner
D, in the first pass of the gases of combustion

A

A. between the boiler and the chimney

18
Q

Mechanical draft is used when burning

A fuel oil
B, coal
C, gas
D, all of the above

A

D, all of the above

19
Q

Larger steam boilers that are equipped with air heaters and/or economizers must use

A forced draft fans only
B. induced draft fans only
C. both forced and induced draft fans
D. natural draft only

A

C. both forced and induced draft fans

20
Q

When using mechanical draft, it is possible to

A. increase the boiler steam pressure
B. reduce thermal shock to the boiler
C, increase the rate of combustion
D, increase the mechanical efficiency

A

C, increase the rate of combustion

21
Q

Draft pressure maintained at a constant pressure is called a draft system.

A secondary
B. primary
C, forced
D, balanced

A

D, balanced

22
Q

The oldest form of draft used in a boiler is
draft

A. mechanical
B. natural
C. forced
D. combination

A

B. natural

23
Q

Solid particles created in the combustion process are called

A. gases of combustion
B. pulverized particles
C. induced carbon
D. fly ash

A

D. fly ash

HIGH PRESSURE BOILERS (11 decks)

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