111

1.

1 point

Which of the following statements about Non-Circulating hot
water systems is true?

The systems eliminate hot water stagnation

The systems have a return line.

The systems cause large amounts of water to be wasted before hot water is available in each fixture.

The systems contain a differential fire recoil element.

The systems are used in large residential buildings.

2.

1 point

Which of the following is not an element found in a
circulating hot water system?

Heaters

Back flow valves

Return Piping

A fire recoil element

Air vents

3.

1 point

Which of the following statements about a pressure relief valve in a building hot water system is false?

the valve may be installed anywhere in the hot water system close to the heater or tank

the valve discharge must not be directly connected to a drain or vent pipe

the valve is opened by pressure in the line surpassing a present pressure set on the spring in the valve

the valve is automatically closed when the water line pressure drops below the spring pressure setting

the relief valve may be isolated from the vessel it serves by means of a gate valve, for the purpose of maintenance.

4.

1 point

Fusible plugs are made of materials that melt at a temperature of

225C

125C

99C

150C

5.

1 point

In a domestic circulating hot water system, automatic air vents serve to

prevent air from being dissolved in water, thus inhibiting corrosion

remove air that is released when the water is heated

supply air to cooling water in the storage tank

aerate the water

relieve pressure from the hydro-pneumatic tanks

6.

1 point

An air gap is a ______ between the free flowing discharge end of a potable water pipe and an open or non-pressure receiving vessel such as a sink or bathtub

low point

vent

physical separation

siphon

7.

1 point

Building codes generally limit the highest pressure permissible in a plumbing systems to:

350 kPa

600 kPa

560 kPa

490 kPa

500 kPa

8.

1 point

Building codes recommend that nowhere in a building plumbing system should the water pressure fall below:

100 kPa

490 kPa

175 kPa

560 kPa

350 kPa

9.

1 point

Which of the following statements about pressure relief
valves is false?

The valve is opened by pressure in the line surpassing a preset pressure set on the spring in the valve.

The valve may be installed anywhere in the hot water system close to the heater or tank.

The valve is automatically closed when the water line pressure drops below the spring pressure setting.

None of the above.

The valve must be directly connected to a drain or vent pipe.

10.

1 point

The building water system that has a storage tank above the highest fixture in the system is called:

a constant pressure system with suction tank

a direct pressure system

a tank-less constant pressure system

a down feed system

an up feed system

11.

1 point

Temperature relief devices limit the temperature in domestic hot water systems to no more than

50C

121C

79C

90C

99C

12.

1 point

Most building regulations prohibit single pipe systems over ____ in length from a hot water heater or hot water recirculating line.

10.5m

12. 2m

15.2m

20.5m

25.5m

13.

1 point

The system which has a storage tank above the highest fixture
in the system is called

an upfeed system

a tankless constant pressure system

a downfeed system

a constant pressure system with suction tank

a direct pressure system

14.

1 point

The backflow prevention method which consists of two
independently acting check valves with an automatic operating
pressure differential relief valve located between the two
check valves is called

air gap backflow prevention

reduced pressure principal device

atmosphere vacuum breaker

PVB

double check valve

15.

1 point

Most municipal water distribution systems operate at pressures between:

350 and 490 kPa

250 and 490 kPa

150 and 500 kPa

0 and 100 kPa

20 and 90 kPa

16.

1 point

Temperature relief devices are effective in eliminating the
following problem:

water stagnation

venting off air released from water during heating

flashing of water into steam when faucets are opened

scale build-up in the system

inadequate heating of the water

17.

1 point

In a circulating hot water system the municipal distribution
systems and/or local storage tanks are used for which of the
following reasons.

Water meter rationing

Both cold water and heater water supply

Water supply to heaters only

Cold water supply only

Hot water supply from municipal heating stations

18.

1 point

When the maximum building demand for water is always less
than the maximum flow available from a municipal or local
distribution system which of the following systems can be
used?

Tankless constant pressure system

A constant pressure system with pneumatic tank

A constant pressure system with suction tank

A gravity system

A downfeed system

19.

1 point

Which of the following statements about a constant pressure
system with Pneumatic Tank is false?

Water entering directly into the pump suction is discharged into pressurized tank.

A system controller automatically starts a standby pump in the event of pump failure.

This system is primarily used in larger buildings.

Air must continuously be introduced into the tank.

The system has a pressure regulator to maintain a relatively constant pressure above the water level inside the tank.