Book 2: 1-05 - "Hot Water Heating System Equipment & Operation"

Question 1

Flow control valves are necessary in each circuit of hot water heating multi-zone pump system to:
Select one:

A. Prevent additional steam flow in the zone

B. Increase the circulation flow

C. Balance the circulation flow in all circuits

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

E. Increase the efficiency of the zone heating

Answer 1

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

Question 2

Zone circuits in multi-zone hot water heating system require a/an _____ to provide the same flow resistance in each circuit.
Select one:

A. Air separator

B. Air vent

C. Zone pump

D. Balancing valve

E. Zone valve

Answer 2

D. Balancing valve

Question 3

If vapour bubbles form in the inlet of a centrifugal pump this could cause _____ in the pump.
Select one:

A. Over pressure

B. Over heating

C. Cavitation

D. Under pressure

E. Lower temperature

Answer 3

C. Cavitation

Question 4

The backflow prevention device is installed on the potable cold water:
Select one:

A. Supply line to the building

B. Feed line to the swimming pool

C. Feed line to the domestic hot water heater

D. Supply line to the fire suppression system

E. Feed line to the boiler

Answer 4

E. Feed line to the boiler

Question 5

The air pressure in the diaphragm tank of a hot water heating system with the system pressure removed should typically be:
Select one:

A. 25 kPa (4 psi)

B. 100 kPa (15 psi)

C. 43 kPa (6 psi)

D. 83 kPa (12 psi)

E. 58 kPa (8 psi)

Answer 5

D. 83 kPa (12 psi)

Question 6

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.
Select one:

A. Pressure increasing

B. Gate

C. Globe

D. Ball

E. Pressure reducing

Answer 6

E. Pressure reducing

Question 7

Special diverter fittings were required in _____ hot water heating systems to ensure an adequate flow of water through each convector.
Select one:

A. Two-pipe direct return

B. One-pipe

C. Two-pipe reverse return

D. Loop

E. Multi-zone

Answer 7

B. One-pipe

Question 8

A steam to hot water heating converter is usually a _____ heat exchanger.
Select one:

A. Shell and tube

B. Radiator

C. Fire tube

D. Water tube

E. Convector

Answer 8

A. Shell and tube

Question 9

Air in hot water heating systems collects in the _____ of piping and heating units.
Select one:

A. High spots

B. Horizontal mains

C. Vertical risers

D. Down comers

E. Return lines

Answer 9

A. High spots

Question 10

If there is insufficient flow in the hot water system a probable cause would be the:
Select one:

A. Screen in pump section plugged

B. Thermostat working properly

C. Stop valves in return headers fully open

D. Stop valves in supply headers fully open

E. Aquastat working properly

Answer 10

A. Screen in pump section plugged

Question 11

One of the chemicals used for the alkaline boil out solution is:
Select one:

A. Sodium chloride (salt)

B. Sodium sulphate (NaSO4)

C. Sodium sulphite (NaSO3)

D. Sodium carbonate (soda ash)

E. Calcium carbonate (CaCO3)

Answer 11

D. Sodium carbonate (soda ash)

Question 12

In hydroid systems the expansion tank is a general term used to describe a piece of equipment for _____ in when heated.
Select one:

A. Air to expand

B. Water to expand

C. Water to heat

D. Steam to accumulate

E. Water to cool

Answer 12

B. Water to expand

Question 13

Air separators used in hot water heating systems trap the air and direct it to the:
Select one:

A. Hot water heater

B. Expansion tank

C. Boiler

D. Convector

E. Radiator

Answer 13

B. Expansion tank

Question 14

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

A. 80°C (176°F)

B. 70°C (158°F)

C. 60°C (140°F)

D. 100°C (212°F)

E. 90°C (194°F)

Answer 14

A. 80°C (176°F)

Question 15

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

A. Screw

B. Vane

C. Reciprocating

D. Lobe

E. Centrifugal

Answer 15

E. Centrifugal

Question 16

If there is an air lock after repairs have been made on the piping system, the operator should:
Select one:

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

B. Install a more powerful pump

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

D. Add chemicals to absorb the trapped air

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

Answer 16

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

Question 17

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:
Select one:

A. Alkaline

B. Dirty

C. Acidic

D. Hard

E. Soft

Answer 17

C. Acidic

Question 18

If there is restricted air flow through a heating unit the operator should check all but:
Select one:

A. Air passages are not restricted

B. The filter is not plugged

C. Damper plates are fully closed

D. Curtains are restricting the air flow

E. A carpet is not restricting the air flow

Answer 18

C. Damper plates are fully closed

Question 19

To avoid cavitation in the pump the pressure at the highest point of the system should be at least equivalent to a head of water of:
Select one:

A. 2 m (6.6 ft.)

B. 0.9 m (3 ft.)

C. 1.5 m (4.9 ft.)

D. 2.2 m (7.2 ft.)

E. 1.2 m (4 ft.)

Answer 19

E. 1.2 m (4 ft.)

Question 20

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

A. Screen

B. Strainer

C. Blank

D. Disc

E. Filter

Answer 20

B. Strainer