Steam Boilers Tech Check 10

Question 1

Boiler water must be conditioned to prevent———-

A, formation of scale
B. oxygen pitting
C. carry over
D. all of the above

Answer 1

D. all of the above

Question 2

Natural water may contain————-

A. solids, gases, and other pollutants from industrial waste
B. dissolved solids only
C. various gases only
D. no contaminants

Answer 2

A. solids, gases, and other pollutants from industrial waste

Question 3

Boiler water having high alkalinity could develop———-

A. scale
B. oxygen pitting
C. caustic embrittlement
D. warping

Answer 3

C. caustic embrittlement

Question 4

Deposits of calcium and magnesium carbonates on the boiler heating surface cause————-

A. scale
B. oxygen pitting
C. caustic embrittlement
D. carry over

Answer 4

A. scale

Question 5

Cracking of the boiler metal along the seams and tube ends is caused by————–

A., scale
B. oxygen pitting
C. caustic embrittlement
D. carry over

Answer 5

C. caustic embrittlement

Question 6

Chemicals added to the boiler water change the scale-forming salts into————

A. an adhering sludge
B. oxygen scavengers
C. a nonadhering sludge
D. a corrosion inhibitor

Answer 6

C. a nonadhering sludge

Question 7

oxygen in the boiler will cause———–

A, scale
B. pitting of boiler metal
C. caustic embrittlement
D. carryover

Answer 7

B. pitting of boiler metal

Question 8

Small amounts of water that leave the boiler with the
steam is called—————–

A, superheated steam
B, saturated steam
C. carryover
D. condensate

Answer 8

C. carryover

Question 9

A direct cause of overheating of the boiler tubes is——-

A. soot formation
B. overfiring
C. insufficient air
D. scale formation on the tubes

Answer 9

D. scale formation on the tubes

Question 10

Priming is dangerous and could lead to——— hammer.

A. steam
B. water
C. gas
D.air

Answer 10

B. water

Question 11

Scale buildup on the water side of a steam boiler is caused by———

A. an impure water supply
B. scale in the raw water
C. improper boiler water treatment
D. scale is found only on the fire side of a boiler

Answer 11

C. improper boiler water treatment

Question 12

oxygen present in the boiler water is removed by———

A. heating the feedwater and using sodium sulfite
B. heating the feedwater only
C. using the bottom blowdown valves
D. using the surface blowdown valves

Answer 12

A. heating the feedwater and using sodium sulfite

Question 13

The frequency of blowing down a steam boiler is best ascertained by———-

A. chief engineer
B. boiler inspector
C. daily testing of boiler water
D. plant load

Answer 13

C. daily testing of boiler water

Question 14

The cold lime-soda process softens the boiler water at——-

A. temperatures of 212 F or above
B, ambient temperature
C. temperatures below 32°F
D. a high, controlled pressure

Answer 14

B, ambient temperature

Question 15

Closer control of boiler water chemical concentrations is maintained by————-

A. surface blowdowns
B. bottom blowdowns
C. a combination of surface and bottom blowdowns
D. continuous blowdowns

Answer 15

D. continuous blowdowns

Question 16

External feedwater treatment conditions the feedwater before it enters the boiler and can be a(n) ——-process.

A. cold lime-soda
B. hot lime-soda
C. ion exchange
D. all of the above

Answer 16

D. all of the above