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

1
Q

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

A

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

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2
Q

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)

A

E. 38°C (100°F)

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3
Q

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

A

D. Positive circulation can be established to all heating units

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4
Q

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

A

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

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5
Q

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

A

D. 30°C

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6
Q

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

A

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

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7
Q

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

A

A. Hot water boilers are smaller and more compact

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8
Q

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

A

D. Smaller pipes may be used

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9
Q

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)

A

D. 70°C to 94°C (158°F to 201°F)

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10
Q

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

A

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

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11
Q

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)

A

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

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12
Q

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

A

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

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13
Q

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

A

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

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14
Q

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

A

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

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15
Q

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)

A

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

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16
Q

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

A

E. Hydronic

17
Q

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)

A

B. 11°C (20°F)

18
Q

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

A

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

19
Q

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)

A

D. 5 cm (2 in)

20
Q

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

A

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