4A Unit 12| Power Engineering
Questions And Correct Answers|
Updated
(4-063-1.14) The operator, while blowing off a boiler, should have an
assistant to:
Select one:
a. Open the blow-off tank drain
b. Watch the gauge glass level
c. Close the quick opening valve in a hurry
d. Open the slow opening valve - Ans--b. Watch the gauge glass level
(4-091-3.3) In a mechanical atomizing burner with three fixed capacity
burners, the Intermediate and high fire burner nozzles may have higher
capacities than the primary burner nozzle:
Select one:
a. To allow slower boiler warm-ups
b. Because of the pump being of the positive displacement type
c. To prevent pressure surges
d. To give greater firing variations - Ans--a. To allow slower boiler warm-ups
(4A-30-12-01-02-03) Which of these groups is the combustible
components of coal.
Select one:
a. Nitrogen, oxygen, ash
b. Carbon, hydrogen, sulphur
c. Carbon dioxide, nitrogen, sulphur dioxide
d. Carbon, ash, nitrogen - Ans--b. Carbon, hydrogen, sulphur
(4-087-5.2) A sudden drop in steam pressure causes:
Select one:
a. "shrinkage"
b. a single element feedwater control to immediately add water to the drum
,c. a sudden increase in drum level
d. a rapid collapse of steam bubbles in the boiler - Ans--c. a sudden increase
in drum level
(4-062-1.1) Stationary soot blowers are installed in the:
Select one:
a. Convection zones
b. Secondary superheater bank
c. Primary superheater bank
d. Reheater bank - Ans--a. Convection zones
(4-058-2.8) The efficiency of a combined cycle plant, using a pressurized
fluidized bed boiler, is about _____ higher than that of a conventional
pulverized coal plant.
Select one:
a. 5%
b. 10%
c. 15%
d. 20% - Ans--a. 5%
(4-091-3.2) Maximum static pressure in a fuel oil line before the oil pump is
limited by code to approximately:
Select one:
a. 35 kPa
b. 70 kPa
c. 10 kPa
d. 15 kPa - Ans--a. 35 kPa
(4-058-3.2) Fluidized bed plants can be built smaller than other designs
because of:
Select one:
a. The use of smaller burners
b. Less slag production and the elimination of soot blowing equipment
c. Higher heat transfer rates and the absence of wet exhaust scrubbing
equipment
d. Higher steam temperatures and pressures - Ans--c. Higher heat transfer
rates and the absence of wet exhaust scrubbing equipment
, (4-092-1.5) One of the advantages of using natural gas as a fuel in a boiler
is:
Select one:
a. No standby fuel is necessary
b. Abundance in supplies
c. Low cost
d. No storage space is required - Ans--d. No storage space is required
(4-056-1.3) The advantage of a steel stack over a reinforced concrete stack
is that a steel stack:
Select one:
a. Has longer life
b. Has lower cost
c. Requires less maintenance
d. Is more durable - Ans--a. Has longer life
(4-104-2.2) Dissolved oxygen in condensate:
Select one:
a. Will cause waterside corrosion
b. Can cause scaling on the return lines
c. Is removed with amines
d. Necessitates the installation of a deaerator - Ans--a. Will cause waterside
corrosion
(4-058-4.2) The typical time required to heat a fluidized bed to ignition
temperature prior to the introduction of coal is:
Select one:
a. Two hours
b. Three hours
c. One hour
d. 30 minutes - Ans--c. One hour
(4-062-1.4) The steam used for soot blowing is usually:
Select one:
a. Superheated at the soot blower nozzle
b. The same as boiler drum pressure
c. Unsaturated steam
d. Low pressure - Ans--a. Superheated at the soot blower nozzle
Questions And Correct Answers|
Updated
(4-063-1.14) The operator, while blowing off a boiler, should have an
assistant to:
Select one:
a. Open the blow-off tank drain
b. Watch the gauge glass level
c. Close the quick opening valve in a hurry
d. Open the slow opening valve - Ans--b. Watch the gauge glass level
(4-091-3.3) In a mechanical atomizing burner with three fixed capacity
burners, the Intermediate and high fire burner nozzles may have higher
capacities than the primary burner nozzle:
Select one:
a. To allow slower boiler warm-ups
b. Because of the pump being of the positive displacement type
c. To prevent pressure surges
d. To give greater firing variations - Ans--a. To allow slower boiler warm-ups
(4A-30-12-01-02-03) Which of these groups is the combustible
components of coal.
Select one:
a. Nitrogen, oxygen, ash
b. Carbon, hydrogen, sulphur
c. Carbon dioxide, nitrogen, sulphur dioxide
d. Carbon, ash, nitrogen - Ans--b. Carbon, hydrogen, sulphur
(4-087-5.2) A sudden drop in steam pressure causes:
Select one:
a. "shrinkage"
b. a single element feedwater control to immediately add water to the drum
,c. a sudden increase in drum level
d. a rapid collapse of steam bubbles in the boiler - Ans--c. a sudden increase
in drum level
(4-062-1.1) Stationary soot blowers are installed in the:
Select one:
a. Convection zones
b. Secondary superheater bank
c. Primary superheater bank
d. Reheater bank - Ans--a. Convection zones
(4-058-2.8) The efficiency of a combined cycle plant, using a pressurized
fluidized bed boiler, is about _____ higher than that of a conventional
pulverized coal plant.
Select one:
a. 5%
b. 10%
c. 15%
d. 20% - Ans--a. 5%
(4-091-3.2) Maximum static pressure in a fuel oil line before the oil pump is
limited by code to approximately:
Select one:
a. 35 kPa
b. 70 kPa
c. 10 kPa
d. 15 kPa - Ans--a. 35 kPa
(4-058-3.2) Fluidized bed plants can be built smaller than other designs
because of:
Select one:
a. The use of smaller burners
b. Less slag production and the elimination of soot blowing equipment
c. Higher heat transfer rates and the absence of wet exhaust scrubbing
equipment
d. Higher steam temperatures and pressures - Ans--c. Higher heat transfer
rates and the absence of wet exhaust scrubbing equipment
, (4-092-1.5) One of the advantages of using natural gas as a fuel in a boiler
is:
Select one:
a. No standby fuel is necessary
b. Abundance in supplies
c. Low cost
d. No storage space is required - Ans--d. No storage space is required
(4-056-1.3) The advantage of a steel stack over a reinforced concrete stack
is that a steel stack:
Select one:
a. Has longer life
b. Has lower cost
c. Requires less maintenance
d. Is more durable - Ans--a. Has longer life
(4-104-2.2) Dissolved oxygen in condensate:
Select one:
a. Will cause waterside corrosion
b. Can cause scaling on the return lines
c. Is removed with amines
d. Necessitates the installation of a deaerator - Ans--a. Will cause waterside
corrosion
(4-058-4.2) The typical time required to heat a fluidized bed to ignition
temperature prior to the introduction of coal is:
Select one:
a. Two hours
b. Three hours
c. One hour
d. 30 minutes - Ans--c. One hour
(4-062-1.4) The steam used for soot blowing is usually:
Select one:
a. Superheated at the soot blower nozzle
b. The same as boiler drum pressure
c. Unsaturated steam
d. Low pressure - Ans--a. Superheated at the soot blower nozzle
