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Book 2 PanGlobal Assessment Test > Chapter 5 Hot Water Heating System Equipment & Operation > Flashcards

Chapter 5 Hot Water Heating System Equipment & Operation Flashcards

1
Q

1.To prevent larger particles from reaching the circulating pump, it is common practice to install a temporary _____ in the suction line.

A. Filter

B. Blank

C. Disc

D. Screen

E. Strainer

A

E. Strainer

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2
Q
  1. The circulator in smaller systems normally produces only a slight pressure differential and, even when it is placed in the return line, a pressure of _____ will ensure that sufficient positive pressure is maintained at the highest points in the system.

A. 25 kPa (4 psi)

B. 83 kPa (12 psi)

C. 55 kPa (8 psi)

D. 10 kPa (1.5 psi)

E. 100 kPa (15 psi)

A

B. 83 kPa (12 psi)

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3
Q
  1. Low pressure hot water heating installations are limited to less than _____ water pressure.

A. 100 kPa (14.5 psi)

B. 1000 kPa (145 psi)

C. 206 kPa (30 psi)

D. 500 kPa (73 psi)

E. 103 kPa (15 psi)

A

C. 206 kPa (30 psi)

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4
Q
  1. Air in hot water heating systems collects in the _____ of piping and heating units.

A. Horizontal mains

B. Vertical risers

C. High spots

D. Down comers

E. Return lines

A

C. High spots

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5
Q
  1. One of the chemicals used for the alkaline boil out solution is:

A. Sodium chloride (salt)

B. Sodium carbonate (soda ash)

C. 4

D. 3

E. 1

A

B. Sodium carbonate (soda ash)

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6
Q
  1. A _____ valve, also called an automatic fill valve, is needed to keep a hot water heating system with a closed expansion tank automatically filled and under proper pressure.

A. Pressure increasing

B. Gate

C. Globe

D. Pressure reducing

E. Ba

A

D. Pressure reducing

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7
Q
  1. The diverter fittings in hot water heating systems make use of a _____ section that reduces the pressure in the return connection and induces a flow of water through the radiator or convector.

A. Reduced size

B. Venturi

C. Over sized

D. Wind

E. Orifice

A

B. Venturi

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8
Q
  1. If the boiler water temperature was too low and the burner found to be out a probable cause would not be:

A. Flame failure device activated

B. Low water cut off activated

C. Fuel valve not open

D. Low air switch activated

E. Operating control set to low

A

E. Operating control set to low

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9
Q
  1. Special diverter fittings were required in _____ hot water heating systems to ensure an adequate flow of water through each convector.

A. One-pipe

B. Two-pipe reverse return

C. Two-pipe direct return

D. Loop

E. Multi-zone

A

A. One-pipe

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10
Q
  1. Air separators used in hot water heating systems trap the air and direct it to the:

A. Boiler

B. Hot water heater

C. Convector

D. Radiator

E. Expansion tank

A

E. Expansion tank

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11
Q
  1. If there is an air lock after repairs have been made on the piping system, the operator should:

A. Increase speed of the pump to force out the air

B. Open the systems vent valves or check operation of the automatic air venting system

C. Add chemicals to absorb the trapped air

D. Increase the temperature of the system to boil the trapped air out

E. Install a more powerful pump

A

B. Open the systems vent valves or check operation of the automatic air venting system

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12
Q
  1. Flow control valves are necessary in each circuit of hot water heating multi-zone pump system to:

A. Prevent continued circulation of hot water after the circulator has been stopped by the zone control

B. Increase the circulation flow

C. Balance the circulation flow in all circuits

D. Increase the efficiency of the zone heating

E. Prevent additional steam flow in the zone

A

A. Prevent continued circulation of hot water after the circulator has been stopped by the zone control

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13
Q
  1. To avoid cavitation in the pump and drawing air into the system, a positive pressure at the highest point of the system should be maintained of at least:

A. 100 kPa (14.5 psi)

B. 76 kPa (11 psi)

C. 52 kPa (7.5 psi)

D. 20 kPa (2.9 psi)

E. 12 kPa (1.7 psi)

A

E. 12 kPa (1.7 psi)

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14
Q
  1. If the boiler water temperature was too low and the burner found to be out a probable cause would not be:

A. Flame failure device activated

B. Low water cut off activated

C. Fuel valve not open

D. Low air switch activated

E. Operating control set to low

A

E. Operating control set to low

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15
Q
  1. One of the chemicals used for the alkaline boil out solution is:

A. Trisodium phosphate (TSP)

B. Sodium chloride (salt)

C. Sodium sulphate (NaSO4)

D. Sodium sulphite (NaSO3)

E. Calcium carbonate (CaCO3)

A

A. Trisodium phosphate (TSP)

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16
Q
  1. Foreign material in a new system may break down chemically during the operation and if present in sufficient quantities, may cause the water to become:

A. Dirty

B. Alkaline

C. Hard

D. Acidic

E. Soft

A

D. Acidic

17
Q
  1. If there is restricted air flow through a heating unit the operator should check all but:

A. The filter is not plugged

B. Curtains are restricting the air flow

C. Damper plates are fully closed

D. A carpet is not restricting the air flow

E. Air passages are not restricted

A

C. Damper plates are fully closed

18
Q
  1. In hydroid systems the expansion tank is a general term used to describe a piece of equipment for _____ in when heated.

A. Water to expand

B. Steam to accumulate

C. Water to heat

D. Air to expand

E. Water to coo

A

A. Water to expand

19
Q
  1. The use of the open expansion tank in hot water heating system is normally limited to a maximum water temperature of:

A. 100°C (212°F)

B. 80°C (176°F)

C. 70°C (158°F)

D. 90°C (194°F)

E. 60°C (140°F)

A

B. 80°C (176°F)

20
Q
  1. A steam to hot water heating converter is usually a _____ heat exchanger.

A. Convector

B. Shell and tube

C. Radiator

D. Water tube

E. Fire tube

A

B. Shell and tube

21
Q
  1. The backflow prevention device is installed on the potable cold water:

A. Feed line to the boiler

B. Supply line to the building

C. Feed line to the domestic hot water heater

D. Supply line to the fire suppression system

E. Feed line to the swimming pool

A

A. Feed line to the boiler

22
Q
  1. A _____ valve should be installed at the beginning of each supply riser and the end of each return riser so that each section can be shut off for servicing without interrupting the operation of the remainder of the heating system.

A. Globe or ball

B. Ball or butterfly

C. Gate or ball

D. Ball or plug

E. Plug or gate

A

C. Gate or ball

23
Q
  1. The pumps used to provide forced circulation in hot water heating systems are electrically driven _____ types, usually of single-stage design.

A. Reciprocating

B. Lobe

C. Vane

D. Screw

E. Centrifugal

A

E. Centrifugal

Book 2 PanGlobal Assessment Test (40 decks)

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