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Book 1 - 5th Power Engineering > chapter 6 > Flashcards

chapter 6 Flashcards

1
Q

One factor that may affect the safety valve set point for an ASME Section IV-constructed hot water heating boiler is:

a. Whether the heating fluid is 50-50 water and gylcol
b. Whether the return is pumped or gravity
c. Whether the boiler is high pressure or low pressure
d. Whether the boiler is located in building’s basement or penthouse

A

d

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2
Q

A diaphragm style expansion tank eliminates:

a. The tank air being absorbed and carried away
b. The need for a safety relief valve
c. The need for an altitude gauge
d. The need for a make up water connection

A

a

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3
Q

The difference between a safety relief valve for use on a hot water heating system and a safety valve for use on a steam system is that the hot water heating system safety relief valve does not require a try lever

True
False
A

false

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4
Q

An altitude gauge

a. show the height of the boiler above datum
b. shows the barometric pressure
c. shows the total height of water in the system above the boiler
d. shows the height of the expansion tank above the boiler

A

c

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5
Q

A hydronic heating system is

a. a low pressure steam heating system
b. a hot water heating system
c. a vacuum pump condensate return system
d. a condensate return system

A

b

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6
Q

An automatic fill valve on a hot water boiler is a/an ____________valve, which keeps the system filled with water and also maintains a set pressure in the system.

a. Pressure reducing
b. Back pressure
c. Pressure control
d. Air vent

A

a

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7
Q

A hot water heating boiler does not require a bottom blowoff connection and valve.

True
False
A

false

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8
Q

n a hydronic heating system, pressure on the boiler will vary with:

a. Method of condensate return
b. Temperature of the heating water
c. Type of burner
d. TDS of the boiler water

A

b

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9
Q

An altitude gauge requires a siphon

True
False
A

false

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10
Q

When doing an actual pop test of the safety relief valve on a hot water heating system:

a. the supply and return lines on the boiler should be closed
b. the pressure in the boiler should be 80% of the relief valve set pressure
c. the expansion tank should be isolated from the boiler
d. the valve to the automatic water feeder should be open

A

a

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11
Q

An altitude gauge indicates

a. Metres above sea level of the boiler installation
b. The heating system pressure
c. The vertical height of water in the heating system
d. The lowest permissible water level in a boiler

A

b

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12
Q

A hydronic heating system is

a. a condensate return system
b. a low pressure steam heating system
c. a vacuum pump condensate return system
d. a hot water heating system

A

d

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13
Q

The scale on the dial of a pressure gauge of a hot water heating boiler shall have a maximum graduation of ________ times the pressure at which the pressure relief valve is set to open.

a. 4.0
b. 1.5
c. 3.5
d. 2.5

A

c

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14
Q

If the automatic fill valve on a hot water heating system is set too high

a.The boiler LWFCO will trip
b. The boiler pressure relief valve will discharge
c. The system flow switch will trip
d. The boiler mercury switch will trip

A

b

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15
Q

A safety relief valve used on a hot water heating boiler opens by popping action

True
False
A

false

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16
Q

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

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

A

c

17
Q

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

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

A

d

18
Q

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

A

e

19
Q

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

A

b

20
Q

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

A

b

21
Q

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

A.NPS 1/2 (DN 15)
b. 25 mm OD
c. NPS 3/4 (DN20)
d. 2 inchesID

A

c

22
Q

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

A

e

23
Q

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

A

b

24
Q

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

A

a

25
Q

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

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

A

c

26
Q

the scale in the dial of a pressure gauge shall have a maximum graduation of __________times the pressure at which the pressure relief valve is set to open

a. 4.0
b. 3.5
c. 2.5
d. 1.5

A

b

27
Q

where should the pressure relief valve be installed in a hot water system

a. the highest point of the system
b. anywhere reasonably close to the tank
c. the lowest point of the system

A

b

28
Q

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
b. 110 c
c. 99 c
d. 134 c

A

c

Book 1 - 5th Power Engineering (20 decks)

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