Book1 chapter 6

Question 1

The automatic fill valve is a _____ valve which keeps the system filled with water and maintains a set pressure in the system.
Select one:

A. Temperature control valve
B. Pressure control valve
C. Back pressure valve
D. Pressure reducing valve
E. Air vent valve

Answer 1

D. Pressure reducing valve

Question 2

The temperature of the water in a hot water heating system with an open expansion tank is normally limited to:
Select one:

A. 99°C (210°F)
B. 60°C (140°F)
C. 150°C (302°F)
D. 80°C (175°F)
E. 121°C (250°F)

Answer 2

D. 80°C (175°F)

Question 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.
Select one:

A. 20 kPa (3 psi)
B. 30 kPa (4.5 psi)
C. 10 kPa (1.5 psi)
D. 14%
E. 5%

Answer 3

A. 20 kPa (3 psi)

Question 4

The discharge piping from the relief valve should be piped to a safe point for disposal and can be:
Select one:

A. Terminated above a floor drain
B. Connected to the deaerator
C. Connected to the condensate tank
D. Connected to any drain
E. Connected to any vent

Answer 4

A. Terminated above a floor drain

Question 5

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:
Select one:

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

Answer 5

A. 99°C (210°F)

Question 6

The purpose of the expansion tank in a hot water heating system is to:
Select one:

A. Provide space to store the returning condensate
B. Add make-up water to the system
C. Provide storage space for excess water
D. Separate the water and steam produced
E. Provide storage space for excess steam

Answer 6

C. Provide storage space for excess water

Question 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.
Select one:

A. 2
B. 1.5
C. 2.5
D. 3
E. 3.5

Answer 7

E. 3.5

Question 8

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

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

Answer 8

D. Tee or lever handle design

Question 9

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..
Select one:

A. 3.5
B. 3
C. 2.5
D. 1.5
E. 2

Answer 9

D. 1.5

Question 10

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

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

Answer 10

D. 19 mm (¾ in.)

Question 11

The pressure relief valve is typically installed on the boiler or reasonably close to the boiler outlet with:
Select one:

A. A plug valve for isolation
B. A globe valve for isolation
C. A ball valve for isolation
D. No valve between
E. A gate valve for isolation

Answer 11

D. No valve between