Ch. 10

Question 1

556. When adding phosphate to the boiler water, the chemical may:
     1) Combine with dissolved solids in the boiler water
     2) Decrease the dissolved solids in the boiler water
     3) Increase the suspended solids in the boiler water
     4) Increase the pH of the boiler water
     a. 1, 2, 3
     b. 1, 2, 4
     c. 1, 3, 4
     d. 2, 3, 4
     e. 1, 2, 3, 4

Answer 1

c. 1, 3, 4

Question 2

557. Chelating agents fed to the boiler water:
     1) Require close control to prevent corrosion
     2) Reduce scale build up within high-pressure boilers
     3) Protects against corrosion within the boiler
     4) Obtains best results with soft water
     a. 1, 2, 3
     b. 1, 2, 4
     c. 1, 3, 4
     d. 2, 3, 4
     e. 1, 2, 3, 4

Answer 2

b. 1, 2, 4

Question 3

558. Organics, such as tannins, lignins and starches are used to:
     1) Control silica in boiler water
     2) Reduce corrosion within the boiler
     3) Coat suspended solids in the boiler water
     4) Produce a non-sticky sludge in the boiler water
     a. 1, 2, 3
     b. 1, 3, 4
     c. 1, 2, 4
     d. 2, 3, 4
     e. 1, 2, 3, 4

Answer 3

b. 1, 3, 4

Question 4

559. To reduce scale and mud formation within the boiler, we:
     1) Force the hardness in the water to come out of solution by feeding sulphite to the boiler water
     2) Treat the suspended solids in the boiler water with lignins
     3) Remove suspended solids from the boiler water through blow off
     4) Feed soda ash, caustic soda or sodium phosphate to precipitate solids in the boiler water
     a. 1, 2, 3
     b. 1, 2, 4
     c. 1, 3, 4
     d. 2, 3, 4
     e. 1, 2, 3, 4

Answer 4

d. 2, 3, 4

Question 5

560. Certain chemicals introduced into the boiler water to prevent scale may:
     1) Form a mud or sludge
     2) Cause foaming or priming
     3) Result in corrosion attack on the metal
     4) Result in reduced boiler blow-off
     a. 1, 2, 3
     b. 1, 3, 4
     c. 1, 2, 4
     d. 2, 3, 4
     e. 1, 2, 3, 4

Answer 5

a. 1, 2, 3

Question 6

561. Carbon dioxide dissolved in boiler feed water causes:
     1) A reduced pH value in the water
     2) Metal loss in the condensate piping
     3) An increase in the water alkalinity
     4) Damage to the feed pump
     a. 1, 2, 3
     b. 1, 2, 4
     c. 1, 3, 4
     d. 2, 3, 4
     e. 1, 2, 3, 4

Answer 6

b. 1, 2, 4

Question 7

562. Water which has been mechanically aerated:
     a. Is suitable to feed directly to the boiler without further treatment
     b. Will be low in dissolved oxygen
     c. Will be free of dissolved gases
     d. May cause pitting in the boiler metal
     e. Will be high in dissolved CO2

Answer 7

d. May cause pitting in the boiler metal

Question 8

563. Contributors to corrosion within a steam boiler are:
     1) Oxygen
     2) Carbon dioxide
     3) A low pH
     4) High chelate concentrations
     a. 1, 2, 3
     b. 2, 3, 4
     c. 1, 3, 4
     d. 1, 2, 4
     e. 1, 2, 3, 4

Answer 8

e. 1, 2, 3, 4

Question 9

564. An amine, which is fed to the boiler for protection of the condensate return lines against corrosion may:
     1) Raise the pH of the condensate
     2) Coat the surfaces of the return piping
     3) Neutralize the acid in the condensate
     4) Cause the condensate to become acidic
     a. 1, 2, 3
     b. 1, 2, 4
     c. 1, 3, 4
     d. 2, 3, 4
     e. 1, 2, 3, 4

Answer 9

a. 1, 2, 3

Question 10

565. Hydrazine is used in some high-pressure boilers:
     a. To control the dissolved solids
     b. To prevent foaming
     c. To eliminate erosion
     d. To reduce oxygen pitting
     e. To condition the sludge

Answer 10

d. To reduce oxygen pitting

Question 11

566. In some boilers, caustic soda (sodium hydroxide) is injected into the boiler water. As a result:
     1) The pH of the boiler water is increased
     2) Foaming could occur at high concentration
     3) Caustic embrittlement could occur
     4) Boiler water acidity is increased
     a. 1, 2, 3
     b. 1, 3, 4
     c. 1, 2, 4
     d. 2, 3, 4
     e. 1, 2, 3, 4

Answer 11

a. 1, 2, 3

Question 12

567. Factors required to produce caustic embrittlement are:
     1) A high pH in the boiler water
     2) Stress of the boiler pressure parts
     3) A riveted joint in the boiler
     4) A leak of boiler water
     a. 1, 2, 3
     b. 2, 3, 4
     c. 1, 3, 4
     d. 1, 2, 4
     e. 1, 2, 3, 4

Answer 12

d. 1, 2, 4

Question 13

568. The most undesirable feature of impurities in boiler feedwater is:
     a. Scale
     b. Caustic embrittlement
     c. Corrosion
     d. Carry over
     e. Sludge

Answer 13

c. Corrosion

Question 14

569. Corrosion of metal in a boiler system is caused by:
     1) A low pH of the boiler water
     2) Oxygen being absorbed by the boiler water
     3) Maintaining an OH- ions concentration higher than that of the H+ ions in the boiler water
     4) Carbon dioxide being allowed into the return condensate
     a. 1, 2, 3
     b. 1, 2, 4
     c. 1, 3, 4
     d. 2, 3, 4
     e. 1, 2, 3, 4

Answer 14

b. 1, 2, 4

Question 15

570. Failure to filter surface water before using it in a boiler may result in:
     1) A hard, tight scale forming on the water surfaces of the boiler metal
     2) Foaming within the boiler
     3) A sludge collecting in the drums
     4) Boiler water carryover with the steam
     a. 1, 2, 3
     b. 1, 3, 4
     c. 1, 2, 4
     d. 2, 3, 4
     e. 1, 2, 3, 4

Answer 15

d. 2, 3, 4

Question 16

571. Boiler blow-off is an important factor in feed water control because it:
     1) Should be completed before the boiler water is tested
     2) Allows removal of sludge thus assists in the prevention of scale
     3) Increases scale formation
     4) Should be completed after the boiler water is tested
     5) Will help control dissolved solids within the boiler
     a. 2, 4, 5
     b. 3, 4, 5
     c. 2, 3, 5
     d. 1, 2, 3
     e. 2, 3, 4, 5

Answer 16

a. 2, 4, 5

Question 17

572. The prime purpose of a continuous blow-off line from the steam drum of a water tube boiler is to:
     a. Heat the make-up water supplying a deaerator
     b. Reduce the solids level of the boiler water by intermittent operation of the blow-off valves
     c. Control the dissolved oxygen in the boiler water
     d. Control the quantity of scale forming salts within the boiler water
     e. Reduce the water level in the boiler

Answer 17

d. Control the quantity of scale forming salts within the boiler water

Question 18

573. _________ is any solid, liquid or vaporous contaminants that leaves the boiler with the steam.
     a. Carryover
     b. Blowdown
     c. Feedwater
     d. Mist

Answer 18

a. Carryover

Question 19

574. ______ is particularly harmful as it forms a very hard deposit on turbine blades.
     a. Carryover
     b. Mist
     c. Silica
     d. Phosphate

Answer 19

c. Silica

Question 20

575. The causes of carryover can be divided into two broad categories, namely mechanical and _______.
     a. virtual
     b. carryover
     c. upset
     d. chemical

Answer 20

d. chemical

Question 21

576. Chemical carryover is primarily caused by _________.
     a. foaming
     b. misting
     c. water
     d. load

Answer 21

a. foaming

Question 22

577. Mechanical carryover can be prevented by careful boiler design and by operating the boiler within the design parameters for _______ level and firing rates.
     a. chemical
     b. water
     c. blowdown
     d. impurities

Answer 22

b. water

Question 23

578. Chemical carryover can be prevented by chemical injection, mud drum blowdown, and _____ ____.
     a. pure water
     b. boiler load
     c. continuous blowdown
     d. more chemicals 1

Answer 23

c. continuous blowdown

Question 24

579. Efficient control of boiler blowdown is an important objective in the operation of most boilers.
     a. True
     b. False

Answer 24

a. True

Question 25

580. A simple blowdown system involves control that is totally reliant on the _______ .
     a. effluent
     b. chemicals
     c. conductivity
     d. operator

Answer 25

d. operator

Question 26

581. Control of the continuous blowdown flow, is ________ adjusted by the operator.
     a. manually
     b. automatically
     c. quickly
     d. slowly

Answer 26

a. manually

Question 27

582. Erratic solids levels in the boiler result in erratic residuals of phosphate, sulphite, and so on, which leads to confusion over the amounts of chemicals that are added.
     a. True
     b. False

Answer 27

a. True

Question 28

583. A significant improvement in _________ can be accomplished by recovering heat from the blowdown water and from its flash steam.
     a. control
     b. efficiency
     c. recovery
     d. chemical

Answer 28

b. efficiency

Question 29

584. The phenolphthalein alkalinity test is carried out on boiler water:
     1) To indicate the amount of bicarbonates in the boiler water
     2) To indicate the amount of dissolved hydroxides in the boiler water
     3) To determine the “P” alkalinity value of the boiler water
     4) To indicate the amount of carbonates in the boiler water
     a. 1, 3, 4
     b. 1, 2, 4
     c. 1, 2, 3
     d. 2, 3, 4
     e. 1, 2, 3, 4

Answer 29

d. 2, 3, 4

Question 30

585. To determine the amounts of all the dissolved materials, which cause alkalinity of the water, you should:
     a. Complete a pH test
     b. Complete a methyl orange test
     c. Complete a phosphate test
     d. Complete a phenolphthalein alkalinity test
     e. Complete a conductivity test

Answer 30

b. Complete a methyl orange test

Question 31

586. An accurate pH reading of boiler water may be obtained by:
     a. Using litmus paper in the water sample
     b. Measuring the hydrogen ion concentration in the water sample
     c. The total alkalinity test
     d. Completing the hardness test
     e. Completing a phosphate test

Answer 31

b. Measuring the hydrogen ion concentration in the water sample

Question 32

587. The test used to determine the ppm of phosphate in the boiler water:
     a. Has a sample with an end colour of blue
     b. Requires the addition of potassium-iodide-iodate solution be added to the sample
     c. Uses an indicator which causes the water sample to turn yellow at the end point of the test
     d. Requires sulphuric acid be titrated into the sample until a faint pink colour develops
     e. Requires the addition of a methyl orange indicator

Answer 32

a. Has a sample with an end colour of blue

Question 33

588. The sodium sulphite test on boiler water:
     a. Requires an amount of starch be added to the sample
     b. Should be filtered prior to adding test chemicals
     c. Should produce an end reading of 20 ppm or less
     d. Indicates the acidity of the boiler water
     e. The total dissolved solids in the boiler water measures

Answer 33

a. Requires an amount of starch be added to the sample

Question 34

589. When testing boiler water for dissolved solids:
     a. We measure the amount of electrical current the sample will conduct
     b. We must neutralize the oxide ion first
     c. Phenolphthalein is added to the sample to cause a blue colour to appear, neutralizing the water
     d. Filter the sample, then add sulphuric acid to neutralize the water
     e. Measure the “m” and “P” alkalinities

Answer 34

a. We measure the amount of electrical current the sample will conduct

Question 35

590. When using a meter to determine the pH of boiler water:
     a. The dissolved salts in the sample should first be neutralized
     b. The voltage between the electrodes will vary according to the hydrogen ion concentration of the sample
     c. The hydrogen ion concentration generates a current in the solution, which is measured and read in pH numbers
     d. The voltage between the electrodes will vary inversely to the concentration of hydrogen ions
     e. The voltage between the electrodes is not effected by the concentration of hydrogen ions

Answer 35

b. The voltage between the electrodes will vary according to the hydrogen ion concentration of the sample

Question 36

591. Shot feeding involves the injection of chemicals over a relatively ______ period of time.
     a. long
     b. intermittent
     c. short
     d. measured

Answer 36

c. short

Question 37

592. A _________ feed system. This involves feeding the chemicals to the boiler system at the most efficient injection points and at a steady and continuous rate.
     a. closed bypass
     b. shot
     c. slug
     d. continuous

Answer 37

d. continuous

Question 38

593. With the _________ feed system, it is common practice to mix one batch of chemicals per day.
     a. closed bypass
     b. shot
     c. slug
     d. continuous

Answer 38

d. continuous

Question 39

594. One method of controlling chemical concentrations, is to prepare chemical batches using a table of tank level vs. ________ _________.
     a. chemical addition
     b. pump stroke
     c. steam flow
     d. feedwater addition

Answer 39

a. chemical addition

Question 40

595. The two most common designs of chemical feed pumps are the___________, plunger-type and the electronic impulse-type.
     a. electric
     b. electronic
     c. reciprocating
     d. vibrating

Answer 40

c. reciprocating