Unit ventilators :
a. do not filter the air
b. do not provide fresh air
c. do not use fans to circulate air
d. mix outside and inside air.
e. do not contain heating coils
Answer: D
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Power Engineering Chapter 96
- The vacuum pump performs the following function:
- Air can be removed from steam heating systems by
- Convectors use ________ to increase heat transfer.
- The difference between a convector and a radiator is:
- One of the main considerations in the construction of radiators suitable for steam heating systems is:
- Modern radiators are usually made of:
- A radiator valve is used to control the amount of:
- Radiators can be classified as:
- In newer steam heating systems, the condensate discharged by the steam traps, convectors, or other heating equipment, drains by gravity through the return piping to:
- Another name for a unit ventilator is:
- The radiator trap is a device that allows:
- The level in the condensate receiver may be automatically controlled by a:
- Older radiators were usually made of:
- Unit heaters differ from convectors in that they use _____ to increase heat transfer.
- _____ are often used to aid the return of condensate through the return piping of large complexes.
- When air is forced through a heating unit that contains both the fan and coil, the unit is called:
- Older radiators were usually made of:
- In fin coil type heaters, individual room temperature is controlled by
- The packless radiator valve has a bronze diaphragm that completely seals off the valve body, to prevent:
- An air vent is partially filled with volatile liquid so that:
- Unit ventilators are:
- Hand operated pet cocks for expelling air from heating systems have been superseded by:
- Large areas, such as warehouses, are usually heated by: