Steam Boilers Tech Check 7

Question 1

The temperature at which fuel oil will give off a vapor that will ignite readily when exposed to an open flame is its —–point.

A, flash
B.fire
C. pour
D. viscosity

Answer 1

A, flash

Question 2

In order to determine the heating value of coal in Btu per pound, the————–

A, proximate analysis is used
B. ultimate analysis is used
C. percentage of volatile matter is needed
D rank of coal is needed

Answer 2

B. ultimate analysis is used

Question 3

The temperature at which fuel oil will give off a vapor that burns continuously is its ————-point.

A. flash
B. fire
C. pour
D. viscosity

Answer 3

B. fire

Question 4

Rank refers to the———– of the coal.

A. ash content
B. Btu content
C. clinker formation
D. degree of hardness

Answer 4

D. degree of hardness

Question 5

Grade refers to the —–of the coal.

A. size, heating value, and ash content
B. size only
C. clinker formation
D. degree of hardness

Answer 5

A. size, heating value, and ash content

Question 6

A proximate analysis of coal provides information regarding its ———

A.moisture content
B. content of volatile matter
C. fixed carbon and ash content
D. all of the above

Answer 6

D. all of the above

Question 7

An ultimate analysis of coal provides information regarding————-

A. elements present in the coal
B. moisture content
C. volatile matter
D. fixed carbon and ash content

Answer 7

A. elements present in the coal

Question 8

Bituminous coal has a high———— content.

A. lignite
B. fixed carbon
C. moisture
D. volatile

Answer 8

D. volatile

Question 9

Anthracite coal has a high——— content.

A. lignite
B. carbon
C. moisture
D. volatile

Answer 9

B. carbon

Question 10

When the temperature of fuel oil is raised, its viscosity———–

A. remains the same
B. is raised
C. is lowered
D cannot be affected by heat

Answer 10

C. is lowered

Question 11

The lowest temperature at which fuel oil will flow is its ——–point.

A. flash
B, fire
C. pour
D. viscosity

Answer 11

C. pour

Question 12

Fuel oil with a low flash point would be——-

A. desirable to use
B. used only in high pressure plants
C. used in either high or low pressure plants
D. dangerous to use

Answer 12

D. dangerous to use

Question 13

—coal is the type coal to have problems with spontaneous combustion when being stockpiled.

A. Lignite
B. Anthracite
C. Bituminous
D. Anthracite stoker

Answer 13

C. Bituminous

Question 14

——-A fire extinguisher is the correct type to use on fuel oil fires.

A. foam or dry chemical
B. soda water
C. carbon tetrachloride
D. feedwater

Answer 14

A. foam or dry chemical

Question 15

Air that controls the rate of combustion is——- air.

A. control
B. excess
C. secondary
D. primary

Answer 15

D. primary

Question 16

Air that controls the combustion efficieney is———- air.

A. control
B. excess
C.secondary
D, primary

Answer 16

C.secondary

Question 17

Air supplied to the burner that is more than the theoretical amount needed to burn fuel is——– air.

A. control
B. excess
C. secondary
D. primary

Answer 17

B. excess

Question 18

———-combustion is when all fuel is burned using only the theoretical amount of air supplied.

A. Complete
B. Incomplete
C. Perfect
D. Theoretical

Answer 18

C. Perfect

Question 19

————combustion is when all the fuel is burned using the minimal amount of excess air.

A. Complete
B. Incomplete
C. Perfect
D. Theoretical

Answer 19

A. Complete

Question 20

Gases of combustion that cool on contact with the boiler heating surface before combustion is completed cause a(n)———

A. loss of draft
B. increase in chimney temperature
C. formation of soot and smoke
D increase in heat transfer

Answer 20

C. formation of soot and smoke

Question 21

Air needed for the combustion of fuel is made up of approximately—— %oxygen and———–% nitrogen.

A. 80: 20
B. 21; 79
C. 50; 50
D. 30; 70

Answer 21

B. 21; 79

Question 22

Soot and smoke are the result of————- combustion.

A. complete
B. incomplete
C. perfect
D. theoretical

Answer 22

B. incomplete

Question 23

———is a combustible found in fuel

A. Carbon
B. Sulfur
C. Hydrogen
D. all of the above

Answer 23

D. all of the above

Question 24

Carbon dioxide (co, in the flue gas indicates———-

A. complete combustion
B. incomplete combustion
C. a high chimney temperature
D. perfect combustion

Answer 24

A. complete combustion

Question 25

Carbon monoxide (CO) in the flue gas indicates———–

A complete combustion
B. incomplete combustion
C, a low chimney temperature
D. complete combustion

Answer 25

B. incomplete combustion

Question 26

The Orsat gas analyzer measures the percentage of———–in the flue gas.

A, carbon dioxide
B. carbon monoxide
C. oxygen
D, all of the above

Answer 26

D, all of the above

Question 27

————-is a type of combustion.

A. Complete
B. Perfect
C. Incomplete
D. all of the above

Answer 27

D. all of the above

Question 28

No,—————fuel oil must be heated to reach the required temperature for combustion.

A. 2
B.3
C.6
D. 10

Answer 28

C.6

Question 29

Higher numbered fuel oils produce———- lower numbered fuel oils.

A. more Btu per gallon than
B. less Btu per gallon than
C. the same amount of Btu as
D. one-half the Btu of

Answer 29

A. more Btu per gallon than

Question 30

The heating value of a fuel is expressed in———–

A. specific gravity
B. fire point units
C. viscosity
B. British thermal units

Answer 30

B. British thermal units