Chapter 6 Basic Fittings for Hot Water Boilers

Question 1

1.The temperature of the water in a hot water heating system with an open expansion tank is normally limited to:
A.	150°C (302°F)
B.	121°C (250°F)
C.	99°C (210°F)
D.	80°C (175°F)
E.	60°C (140°F)

Answer 1

D. 80°C (175°F)

Question 2

2. 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 2

C. 19 mm (¾ in.)

Question 3

3.The relief valve on hot water boilers with a working pressure of up to 414 kPa (60 psi) should open with in a variation of \_\_\_\_\_ below or above the setpoint.
A.	10 kPa (1.5 psi)
B.	5%
C.	30 kPa (4.5 psi)
D.	14%
E.	20 kPa (3 psi)

Answer 3

E. 20 kPa (3 psi)

Question 4

4.The automatic fill valve is a \_\_\_\_\_ valve which keeps the system filled with water and maintains a set pressure in the system. 
A. Pressure reducing valve 
B. Air vent valve 
C. Back pressure valve 
D. Pressure control valve 
E. Temperature control valve

Answer 4

A. Pressure reducing valve

Question 5

5. When hot water boiler stop valves are over 51 mm (2 in.) it is recommended that \_\_\_\_\_ be used. 
A. OS & Y valves with rising spindles 
B. Gate valves 
C. Globe valves 
D. Diaphragm operated valves 
E. Solenoid operated valves

Answer 5

A. OS & Y valves with rising spindles

Question 6

6. The discharge piping from the relief valve should be piped to a safe point for disposal and can be: 
A. Connected to any drain 
B. Connected to any vent 
C. Connected to the deaerator 
D. Terminated above a floor drain 
E. Connected to the condensate tank

Answer 6

D. Terminated above a floor drain

Question 7

7.The highest pressure to which the scale on the pressure gauge of a hot water boiler may be graduated is \_\_\_\_\_ times the pressure at which the pressure relief valve is set. 
A. 1.5 
B. 2 
C. 2.5 
D. 3 
E. 3.5

Answer 7

E. 3.5

Question 8

8. The purpose of the “expansion tank in a hot water” heating system is to:
   A. Provide storage space for excess steam
   B. Separate the water and steam produced
   C. Provide space to store the returning condensate
   D. Add make-up water to the system
   E. Provide storage space for excess water

Answer 8

E. Provide storage space for “excess water”

Question 9

9. 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 9

B. Tee or lever handle design

Question 10

10.The pressure relief valve is typically installed on the boiler or reasonably close to the boiler outlet with: 
A. A globe valve for isolation 
B. A gate valve for isolation 
C. No valve between 
D. A ball valve for isolation 
E. A plug valve for isolation

Answer 10

C. No valve between

Question 11

11.On a hot water boiler, the highest value on the graduated scale of the pressure gauge shall not be less than \_\_\_\_\_ times the pressure at which the pressure relief valve is set. 
A. 1.5 
B. 2 C. 2.5 
D. 3
E. 3.5

Answer 11

A. 1.5

Question 12

12.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 12

C. 99°C (210°F)

Question 13

Answer Chapter 6 Basic Fittings for Hot Water Boilers

1. D
2. C
3. E
4. A
5. A
6. D
7. E
8. E
9. B
10. C
11. A
12. C