Book 2: 1-04 - "Hot Water Heating Systems"

Question 1

The gravity hot water heating system had a disadvantage of:
Select one:

A. The maximum water temperature is limited to 77°C (171°F)

B. Small pipe sizes to keep flow resistance to a minimum

C. Positive circulation to radiators on the same level as the boiler

D. Simple operation and low maintenance

E. There is a quick response to changes in heat demand

Answer 1

A. The maximum water temperature is limited to 77°C (171°F)

Question 2

Temperatures used in radiant panel heating in walls should not exceed:
Select one:

A. 25°C (77°F)

B. 30°C (86°F)

C. 30°C (86°F)

D. 52°C (126°F)

E. 38°C (100°F)

Answer 2

E. 38°C (100°F)

Question 3

An advantage of the forced circulation hot water heating system is:
Select one:

A. Increased power and maintenance costs

B. Noisier operation

C. The response to changes in heating load is slower

D. Positive circulation can be established to all heating units

E. Larger pipes must be used

Answer 3

D. Positive circulation can be established to all heating units

Question 4

The gravity hot water heating system had a disadvantage of:
Select one:

A. Small pipe sizes to keep flow resistance to a minimum

B. Simple operation and low maintenance

C. There is a quick response to changes in heat demand

D. The minimum water temperature is limited to 77°C (171°F)

E. Circulation is difficult to maintain to radiators on the same level as the boiler

Answer 4

E. Circulation is difficult to maintain to radiators on the same level as the boiler

Question 5

The temperature for radiant panel heating in floors should be kept below:
Select one:

A. 15°C

B. 10°C

C. 25°C

D. 30°C

E. 20°C

Answer 5

D. 30°C

Question 6

The gravity hot water heating system had a disadvantage of:
Select one:

A. The minimum water temperature is limited to 77°C (171°F)

B. Positive circulation to radiators on the same level as the boiler

C. Large pipe sizes to keep flow resistance to a minimum

D. Simple operation and low maintenance

E. There is a quick response to changes in heat demand

Answer 6

C. Large pipe sizes to keep flow resistance to a minimum

Question 7

Compared to a steam heating system, which of the following is a advantage of a hot water heating system?
Select one:

A. Hot water boilers are smaller and more compact

B. In a multi-story building the boiler must be designed to withstand high pressure due to the high head of water in the system

C. In a large hot water system, considerable power is required to circulate the water

D. If a leak does occur, more damage will result with a hot water system than with a steam system

E. There is a greater danger of damage due to freezing in a hot water system

Answer 7

A. Hot water boilers are smaller and more compact

Question 8

An advantage of the forced circulation hot water heating system is:
Select one:

A. Positive circulation can not be established to all heating units

B. The response to changes in heating load is slower

C. Increased power and maintenance costs

D. Smaller pipes may be used

E. Noisier operation

Answer 8

D. Smaller pipes may be used

Question 9

The water temperature in a hot water heating system may vary from:
Select one:

A. 50°C to 100°C (122°F to 212°F)

B. 100°C to 150°C (212°F to 302°F)

C. 75°C to 110°C (167°F to 230°F)

D. 70°C to 94°C (158°F to 201°F)

E. 250°C to 300°C (482°F to 572°F)

Answer 9

D. 70°C to 94°C (158°F to 201°F)

Question 10

In the multi-zone hot water heating system, the heating units are:
Select one:

A. Connected in series so the water circulates from the hot water supply main directly through all the convectors to the return main

B. Supplied from the main and the return from each convector is connected back to the main again downstream from the supply connection

C. Zoned with each zone equipped with its own circulating pump

D. All supplied with water at the same temperature and the return from each convector flows by the shortest and most direct route back to the boiler

E. All supplied with water at the same temperature and the return from each convector flows the long way around to return to the boiler

Answer 10

C. Zoned with each zone equipped with its own circulating pump

Question 11

The water pressure in most a hot water heating system is in between:
Select one:

A. 85 kPa to 140 kPa (12.3 psi to 20.3 psi)

B. 250 kPa to 300 kPa (36.3 psi to 43.5 psi)

C. 100 kPa to 150 kPa (14.5 psi to 21.8 psi)

D. 70 kPa to 94 kPa (10.2 psi to 13.6 psi)

E. 75 kPa to 110 kPa (10.9 psi to 16 psi)

Answer 11

A. 85 kPa to 140 kPa (12.3 psi to 20.3 psi)

Question 12

In the two-pipe direct return hot water heating system, the heating units are:
Select one:

A. Equipped with its own circulating pump

B. All supplied with water at the same temperature and the return from each convector flows by the shortest and most direct route back to the boiler

C. All supplied with water at the same temperature and the return from each convector flows the long way around to return to the boiler

D. Supplied from the main and the return from each convector is connected back to the main again downstream from the supply connection

E. Connected in series so the water circulates from the hot water supply main directly through all the convectors to the return main

Answer 12

B. All supplied with water at the same temperature and the return from each convector flows by the shortest and most direct route back to the boiler

Question 13

In the two-pipe reverse return hot water heating system, the heating units are:
Select one:

A. Supplied from the main and the return from each convector is connected back to the main again downstream from the supply connection

B. Equipped with its own circulating pump

C. All supplied with water at the same temperature and the return from each convector flows by the shortest and most direct route back to the boiler

D. Connected in series so the water circulates from the hot water supply main directly through all the convectors to the return main

E. All supplied with water at the same temperature and the return from each convector flows the long way around to return to the boiler

Answer 13

E. All supplied with water at the same temperature and the return from each convector flows the long way around to return to the boiler

Question 14

An advantage of the forced circulation hot water heating system is:
Select one:

A. Increased power and maintenance costs

B. Positive circulation can not be established to all heating units

C. Larger pipes must be used

D. Noisier operation

E. The response to changes in heating load is more rapid

Answer 14

E. The response to changes in heating load is more rapid

Question 15

The gravity hot water heating system had a disadvantage of:
Select one:

A. Small pipe sizes to keep flow resistance to a minimum

B. Simple operation and low maintenance

C. Positive circulation to radiators on the same level as the boiler

D. There is a slow response to changes in heat demand

E. The minimum water temperature is limited to 77°C (171°F)

Answer 15

D. There is a slow response to changes in heat demand

Question 16

A hot water heating system also known as a _____ heating system is similar in many respects to a steam heating system.
Select one:

A. Liquid

B. Wet

C. Hydraulic

D. Latent

E. Hydronic

Answer 16

E. Hydronic

Question 17

In the hot water heating system, the temperature difference from the boiler outlet through the system piping and back to the boiler return connection is usually:
Select one:

A. 25°C (77°F)

B. 11°C (20°F)

C. 5°C (41°F)

D. 21°C (70°F)

E. 15°C (59°F)

Answer 17

B. 11°C (20°F)

Question 18

In the one-pipe hot water heating system, the heating units are:
Select one:

A. All supplied with water at the same temperature and the return from each convector flows the long way around to return to the boiler

B. Connected in series so the water circulates from the hot water supply main directly through all the convectors to the return main

C. All supplied with water at the same temperature and the return from each convector flows by the shortest and most direct route back to the boiler

D. Supplied from the main and the return from each convector is connected back to the main again downstream from the supply connection

E. Equipped with its own circulating pump

Answer 18

D. Supplied from the main and the return from each convector is connected back to the main again downstream from the supply connection

Question 19

The heating coils in a snow melting system should be embedded at least _____ below the concrete surface.
Select one:

A. 7.5 cm (3 in)

B. 10 cm (4 in)

C. 1 cm (0.4 in)

D. 5 cm (2 in)

E. 2 cm (0.8 in)

Answer 19

D. 5 cm (2 in)

Question 20

In the series loop hot water heating system, the heating units are:
Select one:

A. All supplied with water at the same temperature and the return from each convector flows the long way around to return to the boiler

B. Supplied from the main and the return from each convector is connected back to the main again downstream from the supply connection

C. Connected in series so the water circulates from the hot water supply main directly through all the convectors to the return main

D. Equipped with its own circulating pump

E. All supplied with water at the same temperature and the return from each convector flows by the shortest and most direct route back to the boiler

Answer 20

C. Connected in series so the water circulates from the hot water supply main directly through all the convectors to the return main