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Boilers > Steam Boilers Module 15 Session 6 > Flashcards

Steam Boilers Module 15 Session 6 Flashcards

1
Q 
A(n) \_\_\_\_\_\_\_\_\_\_\_\_ draft fan must be used to overcome resistance caused by gases of combustion leaving the boiler when an economizer is used.
A. Induced
B. Forced
C. Natural
D. Manual
A

A. Induced

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2
Q

An economizer is used in large boiler plants to heat ____________.
A. Fuel oil using flue gas temperature
B. Air for combustion
C. Feedwater using gases of combustion
D. Steam before it enters the superheater

A

C. Feedwater using gases of combustion

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3
Q

The feedwater stop valve on the feedwater line is located closest to the shell of the boiler so that the ____________.
A. Operator can reach it
B. Boiler can be taken off-line »
C. Check valve can be repaired without taking the boiler off-line
D. No valves are allowed between the boiler and the feedwater pump

A

C. Check valve can be repaired without taking the boiler off-line

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4
Q

Water temperature that is too high in the open feedwater heater could cause ____________.
A. Oxygen pitting in the boiler
B. Thermal shock to the boiler
C. The feedwater pump to become steam bound
D. The feedwater pump to become water bound

A

C. The feedwater pump to become steam bound

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5
Q

Water temperature that is too low in the open feedwater heater could cause ____________.
A. Oxygen pitting in the boiler
B. The feedwater pump to become steam bound
C. The feedwater pump to become water bound
D. No problem; extra heat would be made up in the combustion chamber

A

A. Oxygen pitting in the boiler

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6
Q

The sequence of three numbers found on the data plate attached to a reciprocating feedwater pump indicates the ____________.
A. Area of steam piston, area of Water piston, and length of pump stroke
B. Area of Water piston, area of steam piston, and length of pump stroke
C. Diameter of water piston, diameter of steam piston, and length of pump stroke
D. Diameter of steam piston, diameter of water piston, and length of pump stroke

A

D. Diameter of steam piston, diameter of water piston, and length of pump stroke

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7
Q 
The theory of operation of a centrifugal pump is that the centrifugal force of a rotating element \_\_\_\_\_\_\_\_\_\_\_\_.
A. Will overcome kinetic energy
B. Is converted into pressure
C. Will be less than potential energy
D. Is equal to atmospheric pressure
A

B. Is converted into pressure

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8
Q 
Centrifugal feedwater pumps can be started with their discharge valves \_\_\_\_\_\_\_\_\_\_\_\_.
A. Open
B. Partly open
C. Open or closed
D. Removed
A

C. Open or closed

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9
Q 
A turbine feedwater pump differs from a centrifugal feedwater pump in that it is a \_\_\_\_\_\_\_\_\_\_\_\_.
A. Nonpositive displacement pump
B. Positive displacement pump
C. Pump that can only be steam driven
D. Straight mechanical drive pump
A

B. Positive displacement pump

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10
Q 
To protect the turbine pump from excessive pressure, a(n) \_\_\_\_\_\_\_\_\_\_\_\_ must be installed on the discharge line.
A. Safety relief valve
B. Bypass line
C. Pump governor
D. Overspeed trip
A

A. Safety relief valve

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11
Q 
Condensate tanks and pumps are installed at the  \_\_\_\_\_\_\_\_\_\_\_\_ points in each building where steam is being used for heating or process.
A. Highest
B. Mid
C. Lowest
D. Quietest
A

C. Lowest

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12
Q 
Condensate pumps are used to return all possible condensate from various parts of the plant to the \_\_\_\_\_\_\_\_\_\_\_\_.
A. Water tank
B. Surge tank
C. Open feedwater heater
D. Float feedwater regulator
A

B. Surge Tank (According to book and instructor)

C. Open feedwater heater (According to Slides)

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13
Q 
“NOWL” stands for:
A. Natural overfeed water line
B. Normal operating water level
C. Normally open water line
D. Negative outside water level
A

B. Normal operating water level

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14
Q

The automatic city water makeup valve found on an open feedwater heater is used to ____________.
A. Add city Water to the boiler if returns are low
B. Maintain a water level in the feedwater heater if there are insufficient condensate returns
C. Start and stop the feedwater pump on boiler demand
D. Never found on open feedwater heaters

A

B. Maintain a water level in the feedwater heater if there are insufficient condensate returns

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15
Q 
When a feedwater pump feeds more than one boiler, each boiler should be isolated with a  \_\_\_\_\_\_\_\_\_\_\_\_ valve.
A. Globe
B. Pressure
C. Reducing
D. Ball
A

A. Globe

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16
Q 
The main feedwater line utilizes \_\_\_\_\_\_\_\_\_\_\_\_ and stop valves to control water flow.
A. Ball
B. Check
C. Pressure
D. Globe
A

B. Check

17
Q

The purpose of a feedwater regulator is to ____________.
A. Shut down the boiler in the event of low water
B. Prevent a furnace explosion
C. Control water level in the feedwater heater
D. Maintain a consistent water level in the boiler

A

D. Maintain a consistent water level in the boiler

18
Q 
Feedwater regulator sensing elements are located
A. On the steam line
B. On the water line
C. On the blowdown line
D. At the NOWL
A

D. At the NOWL

19
Q 
Which of the following are automatic devices that increase the overall efficiency of a steam plant by removing air and condensate from steam lines and heat exchangers without the loss of steam?
A. Steam traps
B. Try cocks
C. Float chambers
D. Feedwater regulators
A

A. Steam traps

20
Q 
The thermostatic steam trap can be used with \_\_\_\_\_\_\_\_\_\_\_\_ pressure steam.
A. Low
B. Medium
C. High
D. Both high and low
A

D. Both high and low

21
Q 
Which of the following steam traps are used when large quantities of condensate must be removed?
A. Thermostatic steam traps
B. Float thermostatic steam traps
C. Inverted bucket steam traps
D. Thermodynamic steam traps
A

C. Inverted bucket steam traps

22
Q 
The quality of steam increases with the use of a \_\_\_\_\_\_\_\_\_\_\_\_.
A. Line desuperheater
B. Pressure-reducing station
C. Drum desuperheater
D. Feedwater regulator
A

A. Line desuperheater

23
Q 
Which of the following types of desuperheaters are used primarily on marine boilers?
A. Drum
B. Line
C. Pressure
D. Tank
A

A. Drum

24
Q 
The quality of steam \_\_\_\_\_\_\_\_\_\_\_\_ with the use of a line desuperheater.
A. Increases
B. Decreases
C. Pressurizes
D. Stays the same
A

A. Increases

Boilers (10 decks)

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