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9 Cards in this Set
- Front
- Back
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A fired heater which is installed on location where the heat is needed and heats the air directly without the use of any ducting is called a/an: 1) Space heater 2) Fin-coil heat exchanger 3) Unit ventilator 4) Convector 5) Unit heater |
Space heater |
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A type of directly fired space heater is: 1) A floor furnace 2) A unit heater 3) All of the above 4) None of the above 5) A wall furnace |
All of the above |
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One of the disadvantages of the forced warm air heating systems is the: 1) Air contains too much moisture 2) Installation and maintenance costs are higher than the steam heating systems 3) Poor air circulation 4) High cost for the system due to specialty equipment required 5) System can be quite noisy as compared to the gravity warm air heating systems |
System can be quite noisy as compared to the gravity warm air heating systems |
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In a high efficiency furnace or heater the temperature of the flue gases are _____ in the secondary heat exchanger. 1) Below the dew point 2) On the dew point 3) Above the dew point 4) Very low 5) Very high |
Below the dew point |
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When the primary source of heat is steam or hydronic a fin-coil heat exchanger supplied with hot water or steam from the boiler is used to: 1) Increase the air temperature in an electric resistance coil heating system 2) Reheat the hot water in the primary heating system 3) Heat air in the secondary warm air heating system 4) Heat air in the primary warm air heating system 5) Reheat the steam in the secondary heating system |
Heat air in the secondary warm air heating system |
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Lowboy furnaces are just over _____ in height. 1) 1.4 m 2) 1.6 m 3) 0.8 m 4) 1.2 m 5) 1.0 m |
1.2 m |
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Forced warm air heating systems, as compared to steam or hot water heating systems, are used more extensively to heat residences, small commercial buildings, shops, and stores since: 1) It does not require duct work 2) There is no maintenance required 3) It is very quiet in operation 4) It is very portable 5) Installation and maintenance costs are lower |
Installation and maintenance costs are lower |
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Various types of heat sources are used in warm air heating systems. They can be divided into the following classes: 1. Indirectly-fired 2. Directly fired 3. Electric resistance coil 4. High voltage coil 5. Fin-coil heat exchanger 1) 2, 3, 5 2) 1, 2, 3 3) 3, 4, 5 4) 2, 3, 4 5) 1, 3, 4 |
1) 2, 3, 5 |
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The advantage of having duct furnaces instead of a large central furnace is: 1) Better control of heat in each zone of the building 2) Less initial cost 3) Requires less space 4) Lower maintenance costs 5) Easier installation |
Better control of heat in each zone of the building |
