Book 1: 2-07 - Low Water Fuel Cut-Offs & Feedwater Controls Flashcards

1
Q

The low water level fuel cut-off will shut off the fuel to the heating boiler when the water level drops below:
Select one:

A. 50 mm (2 in.) above the bottom of the gauge glass

B. The lowest permissible water level

C. 25 mm (1 in.) above the bottom of the gauge glass

D. The lowest visible part of the gauge glass

E. One half of the gauge glass

A

D. The lowest visible part of the gauge glass

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2
Q

Low water fuel cut-off devices require regular attention, the following intervals are recommended:
1. Once per shift
2. Daily
3. Weekly
4. Monthly
5. No attention is required
Select one:

A. 3, 4, 5

B. 1, 2, 3

C. 1, 2, 4

D. 2, 3, 4

E. 2, 3, 5

A

D. 2, 3, 4

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3
Q

In a building heating system the condensate in the condensate receiver tank comes from the:
Select one:

A. Heating system

B. Make-up water supply

C. Deaerator

D. Economizer

E. Boiler feedwater

A

A. Heating system

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4
Q

Possible causes of low water level include:
1. Leaks caused by breakage or corrosion
2. Excessive blowdown
3. Automatic feedwater valve passing
4. Boiler feed pump failure
5.Excessive make-up
Select one:

A. 3, 4, 5

B. 1, 2, 4

C. 2, 3, 5

D. 2, 3, 4

E. 1, 2, 3

A

B. 1, 2, 4

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5
Q

The low water fuel cut-off float is commonly used to operate both the Low water fuel cut-off switch and the:
Select one:

A. Low fuel gas pressure switch

B. Low steam pressure alarm

C. Low feedwater temperature alarm

D. High steam pressure switch

E. Feedwater control switch

A

E. Feedwater control switch

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6
Q

A second source of feedwater may be controlled by the:
Select one:

A. Boiler drum level control

B. Boiler operating control

C. Automatic blowdown device

D. Low water fuel cut-off device

E. Feedwater control switch

A

D. Low water fuel cut-off device

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7
Q

At normal boiler steaming rates, a condensate receiver tank should contain a sufficient volume of water equivalent to the water evaporated by the boiler for a maximum period of _____ minutes.
Select one:

A. 30

B. 15

C. 20

D. 45

E. 60

A

A. 30

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8
Q

Make-up water for the heating system usually comes from the:
Select one:

A. City water supply

B. Returning condensate

C. Boiler feedwater

D. Boiler feedwater pump

E. Deaerator

A

A. City water supply

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9
Q

The float in the low water fuel cut-off will activate:
Select one:

A. A globe valve

B. A gate valve

C. A solenoid valve

D. An electrical relay

E. An electrical switch

A

E. An electrical switch

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10
Q

The float operated low water fuel cut-off works on the principle of:
Select one:

A. Temperature change

B. Steam density

C. Drum level variation

D. Buoyancy

E. Differential pressure

A

D. Buoyancy

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11
Q

At normal boiler steaming rates, a condensate receiver tank should contain a sufficient volume of water equivalent to the water evaporated by the boiler for a maximum period of _____ minutes.

Select one:

A. 45
B. 60
C. 20
D. 30
E. 15

A

D. 30

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12
Q

Make-up water for the heating system usually comes from the:

Select one:

A. Returning condensate
B. Deaerator
C. Boiler feed water
D. City water supply
E. Boiler feed water pump

A

D. City water supply

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13
Q

In a building heating system the condensate in the condensate receiver tank comes from the:

Select one:

A. Make-up water supply
B. Heating system
C. Deaerator
D. Boiler feed water
E. Economizer

A

B. Heating system

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14
Q

Low water fuel cut-off devices require regular attention, the following intervals are recommended:
1. Once per shift
2. Daily
3. Weekly
4. Monthly
5. No attention is required

Select one:

A. 3,4,5
B. 1,2,4
C. 2,3,5
D. 2,3,4
E. 1,2,3

A

D. 2,3,4

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15
Q

The main cause of heating boiler failure is overheating of the heating surfaces due to:

Select one:

A. High water conditions
B. High firing rates
C. Low steak conditions
D. Low water conditions
E. Scale build-up

A

D. Low water conditions

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16
Q

The low water level fuel cut-off will shut off the fuel to the heating boiler when the water level drops below:

Select one:

A. One half of the gauge glad
B. 50 mm (2 in.) above the bottom of the gauge glass
C. 25 mm (1 in.) above the bottom of the gauge glass
D. The lowest permissible water level
E. The lowest visible part of the gauge glass

A

E. The lowest visible part of the gauge glass

17
Q

The float operated low water fuel cut-off works in the principle of:

Select one:

A. Differential pressure
B. Drum level variation
C. Steam density
D. Buoyancy
E. Temperature change

A

D. Buoyancy

18
Q

The low water fuel cut-off float is commonly used to operate both the Low water fuel cut-off switch and the:

Select one:

A. High steam pressure switch
B. Low fuel gas pressure switch
C. Feed water control switch
D. Low steam pressure alarm
E. Low feed water temperature alarm

A

C. Feed water control switch

19
Q

Possible causes of low water level include:
1. Leaks caused by the breakage or corrosion
2. Excessive blowdown
3. Automatic feedwater valve passing
4. Boiler feed pump failure
5. Excessive make-up

Select one:

A. 2,3,5
B. 1,2,3
C. 3,4,5
D. 1,2,4
E. 2,3,4

A

D. 1,2,4

20
Q

The float in the low water fuel cut-off will activate:

Select one:

A. A gate valve
B. An electrical switch
C. An electrical relay
D. A solenoid valve
E. A globe valve

A

B. An electrical switch

21
Q

A second source of feedwater may be controlled by the:
Select one:

A. Automatic blowdown device
B. Low water fuel cut-off device
C. Boiler drum level control
D. Boiler operating control
E. Feedwater control switch

A

B. Low water fuel cut-off device

22
Q

The main causes of heating boiler failure is overheating of the heating surfaces due to:
Select one:

A. Scale build up
B. High firing rates
C. Low water conditions
D. Low steam conditions
E. High water conditions

A

C. Low water conditions

23
Q

The low water level fuel cut-off will shut off the fuel to the heating boiler when the water level drops below:
Select one:

A. one half of the gauge glass
B. 25 mm (1 in.) above the bottom of the gauge glass
C. 50 mm (2 in.) above the bottom of the gauge glass
D. The lowest visible part of the gauge glass
E. The lowest permissible water level

A

D. The lowest visible part of the gauge glass

24
Q

In a building heating system the condensate in the condensate receiver tank comes from the:
Select one:

A. Deaerator
B. Make-up water supply
C. Heating system
D. Boiler feedwater
E. Economizer

A

C. Heating system

25
Q

Make-up water for the heating system usually comes from the:
Select one:

A. City water supply
B. Returning condensate
C. Deaerator
D. Boiler feedwater
E. Boiler feedwater pump

A

A. City water supply

26
Q

The low water fuel cut-off float is commonly used to operate both Low water fuel cut-off switch and the:
Select one:

A. Low fuel gas pressure switch
B. Feedwater control switch
C. Low steam pressure alarm
D. Low feedwater temperature alarm
E. High steam pressure switch

A

B. Feedwater control switch

27
Q

Possible causes of low water level include:
1. Leaks caused by breakage or corrosion
2. Excessive blowdown
3. Automatic feedwater valve passing
4. Boiler feed pump failure
5. Excessive make-up

Select one:
A. 3,4,5
B. 1,2,4
C. 2,3,5
D. 2,3,4
E. 1,2,4

A

E. 1,2,4

28
Q

Low water fuel cut-off devices require regular attention, the following intervals are recommended:
1. Once per shift
2. Daily
3. Weekly
4. Monthly
5. No attention is required

Select one:
A. 1,2,4
B. 3,4,5
C. 2,3,4
D. 1,2,3
E. 2,3,5

A

C. 2,3,4

29
Q

The float in the low water fuel cut-off will activate:

Select one:
A. An electrical switch
B. A solenoid valve
C. A glove valve
D. An electrical relay
E. A gate valve

A

A. An electrical switch

30
Q

The float operated low water fuel cut-off works on the principle of:

Select one:
A. Differential pressure
B. Steam density
C. Buoyancy
D. Drum level variation
E. Temperature change

A

C. Buoyancy