Unit 2 Review Boiler Fittings & Controls Comprehensive Self-Assessment

Question 1

1. The “hot water heating boiler burner control uses” the _____ as the sensed variable.

A. Boiler water temperature 
B. Boiler water pressure 
C. Feedwater pressure 
D. Drum water level
E. Boiler steam temperature

Answer 1

A. Boiler water “temperature”

Question 2

2. When the pressure inside the “Bourdon tube increases” the tube will tend to:

A. Become more oval showing higher pressure 
B. Straighten showing lower pressure 
C. Curve more showing higher pressure 
D. Curve more showing lower pressure 
E. Straighten showing higher pressure

Answer 2

E. Straighten showing higher pressure

Question 3

3.During boiler operation if the combustion air pressure drops to low the _____ switch will de-energize the fuel valve.

A. Low gas pressure 
B. High gas pressure 
C. Low water level 
D. Low air pressure 
E. High limit

Answer 3

D. Low air pressure

Question 4

4. What is the device used to determine that the fan motor is working:

A. Motor contactor 
B. Air flow switch 
C. Power amperage draw meter 
D. Indicator light 
E. Flame scanner

Answer 4

B. Air flow switch

Note: determine fan so AIR FLOW

Question 5

5. All fittings ‘‘not properly or clearly identified’’:

A. May be used for low pressure service 
B. Can be used in water applications 
C. Can be used for compressed air service 
D. Should be kept for emergency use 
E. Should be rejected

Answer 5

E. Should be rejected

All fittings ‘‘not properly or clearly identified’’:

Question 6

6. Pressure gauges may loose their accuracy due to:

A. Wear and tear 
B. Metal fatigue 
C. Excessive vibration 
D. Steam entering the Bourdon tube 
E. All of the above

Answer 6

E. All of the above

Question 7

7.Boiler gauge glass packing nuts “may be tightened”:

A. At any time 
B. Once the pressure has been removed 
C. Once the glass has cooled to room temperature 
D. With a torque wrench 
E. Only hand tight

Answer 7

B. Once the ‘‘pressure has been removed’’

Question 8

8. Possible causes of low water level include:
9. Leaks caused by breakage or corrosion
10. Excessive blowdown
11. Automatic feedwater valve passing
12. Boiler feed pump failure
13. Excessive make-up

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

Answer 8

D. 1, 2, 4

leaks,blowdown,pump failure

Question 9

9. The safety valve pop test can be carried out by:

A. Lifting the try lever 
B. Reducing the pressure on the spring 
C. Slowly raising the boiler pressure 
D. Popping the valve with a hammer 
E. Lowering the try lever

Answer 9

C. Slowly raising the boiler pressure

Question 10

10. A safety valve must be mounted:
11. In the horizontal position
12. To the boiler by a short nipple
13. At the highest practicable part of the boiler
14. With discharge water properly drained
15. With a valve next to the boiler

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

Answer 10

B. 2, 3, 4

2. To the boiler by a short nipple
3. At the highest practicable part of the boiler
4. With discharge water properly drained

Question 11

11. '’Try cocks’’ are used on boilers to:

A. Test for steam pressure 
B. Prove the temperature of the steam 
C. Test the operation of the safety valve 
D. Drain water from the water column 
E. Check the boiler water level

Answer 11

E. Check the boiler water level

“TRY COCKS”

Question 12

12. A pressure gauge can most accurately be calibrated by using:

A. The Inspector’s test gauge 
B. A dead weight tester 
C. A test gauge comparator 
D. Hydraulic comparator 
E. Another pressure gauge

Answer 12

B. A dead weight tester

‘‘Used in Calibrating Pressure Gauge’’

Question 13

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

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

Answer 13

C. Feedwater control switch

Question 14

14. The high limit control of a steam heating boiler should operate at the:

A. Cut-out pressure of the operating control
B. Maximum allowable working pressure
C. Between the set pressures of the operating control and safety valve
D. Set pressure of the safety valve
E. Blowdown pressure of the safety valve

Answer 14

C. Between the ‘‘set pressures’’ of the operating control and ‘‘safety valve’’

Question 15

15. The minimum size of the hot water heating boiler bottom blow off or drain connection shall be:

A. 6 mm (¼ in.) 
B. 15 mm (½ in.) 
C. 19 mm (¾ in.) 
D. 25 mm (1 in.) 
E. 75 mm (3 in.)

Answer 15

C. 19 mm (¾ in.)

Question 16

16. The wax filled sensor probe in a combination pressure-temperature relief valve will expand and open the valve by means of a piston at approximately:

A. 50°C (122°F) 
B. 110°C (230°F) 
C. 99°C (210°F) 
D. 134°C (273°F) 
E. 60°C (140°F

Answer 16

C. 99°C (210°F)

Question 17

17. Boiler fittings must comply with the requirements set out in the:
18. ASME Codes
19. ANSI Codes
20. CSA B51
21. CSA B52
22. The regulations of the authority having jurisdiction

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

Answer 17

D. 1, 3, 5

1. ASME Codes
2. CSA B51
3. The regulations of the authority having jurisdiction

Question 18

18. A check valve is used in the feedwater line to prevent:

A. Water hammer in the feedwater line
B. A reverse flow of steam from the boiler
C. A reverse flow of water from the boiler
D. Air from entering the feedwater line
E. A reverse of water from the feedwater line

Answer 18

C. A reverse flow of water from the boiler

Question 19

19. When the pressure in the boiler approaches its _____, the safety valve will pop open and release the steam to atmosphere.

A. Normal steam drum operating pressure 
B. Maximum allowable working pressure 
C. Normal process header steam pressure 
D. Turbine inlet operating pressure 
E. Ultimate tensile strength

Answer 19

B. “Maximum allowable” working pressure

Question 20

20. The operating handle of the valve to the pressure gage on a hot water boiler must be of the:

A. Hand wheel type 
B. Tee or lever handle design 
C. Diaphragm type 
D. Solenoid type 
E. A valve is not permitted in this location

Answer 20

B. Tee or lever handle design

Question 21

21. The ‘‘boiler vent’’ valve is used for the purpose of allowing:

A. Steam to escape while filling 
B. Air to escape while draining 
C. Water to escape while filling 
D. Steam to enter while draining 
E. Air to escape while filling

Answer 21

B. ‘‘Air to escape’’ while draining

Note: Boiler Vent

Question 22

22. If the pressure of the gas supplied to the burner “increases beyond the maximum” required for safe combustion the _____ switch will de-energize the fuel valve.

A. Low gas pressure 
B. High gas pressure 
C. Low water level 
D. Low air pressure
E. High limit

Answer 22

B. High gas pressure

ris ipsa loquitor

Question 23

23. The low air pressure cut-off switch can be tested by:

A. Closing the main gas valve quickly
B. Slowly covering the air supply to the fan
C. Slowly raising the boiler pressure above the operating setpoint
D. Slowly closing the main gas valve
E. Quickly closing the main burner shut-off valve

Answer 23

B. Slowly “covering” the air supply to the fan

Question 24

24. The “popping” pressure of a safety valve may be increased by:

A. Raising the adjusting ring 
B. Lowering the adjusting ring 
C. Increasing the spring pressure 
D. Decreasing the spring pressure 
E. Raising the lifting level

Answer 24

C. ‘‘Increasing’’ the spring pressure

Question 25

25. The Inspector’s ‘‘test gauge is used’’ to:

A. Measure the pressure on the boiler
B. Test the pressure on the boiler
C. Confirm that there is pressure on the boiler
D. Confirm the pressure shown on the boiler pressure gauge
E. Calibrate the pressure gauge on the boiler

Answer 25

D. Confirm the pressure shown on the boiler ‘‘pressure gauge’’

Question 26

26. In a pressure gauge the Bourdon tube is connected to the pointer via a/an:

A. Wheel and axle 
B. Differential gear 
C. Geared sector and pinion 
D. Rack and pinion 
E. Pulley and cable

Answer 26

C. Geared sector and pinion

Question 27

27. The lock-out switch will be actuated when the:

A. Operating control closes 
B. Low water fuel cut-off opens 
C. Flame scanner loses the flame 
D. Power fails 
E. Operating control opens

Answer 27

C. Flame scanner loses the flame

Question 28

28. A second source of feedwater may be controlled by the:

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

Answer 28

D. Low water fuel cut-off device

Question 29

29. The procedure for testing a directly connected gauge glass would be.
30. Close the gauge water valve
31. Open the gauge water valve
32. Close the gauge steam valve
33. Open the gauge steam valve
34. Close the gauge drain valve
35. Open the gauge drain valve
36. Proving steam passage is clear
37. Proving water passage is clear

A. 1, 6, 7, 3, 8, 5 
B. 3, 6, 8, 3, 7, 5 
C. 1, 6, 7, 2, 8, 3 
D. 1, 6, 7, 3, 2, 8, 5 
E. 3, 6, 8, 4, 1, 7, 2

Answer 29

D. 1, 6, 7, 3, 2, 8, 5

Question 30

30. Before a steam or hot water boiler can be started by a programming control, all but one of the following conditions must be fulfilled: \

A. The water in the boiler drum must be above the cut-off point of the low-water fuel cut-off

B. All manually operated valves in the fuel lines to the pilot and main burner must be closed

C. If the boiler is gas-fired, the fuel supply pressure to the burner valves must be above the cutout point of the low gas pressure cut-off

D. The steam pressure or water temperature must be at or below the cut-in setting of the operating control
E. The main power switch or breaker must be closed

Answer 30

B. All manually operated valves in the fuel lines to the pilot and main burner must be closed