Why are split-system installation valves typically not used following installation?
A) They limit flow to the service ports. B) They are usually stuck in the open position.
C) They do not control flow to service ports. D) They are usually stuck in the closed position.
C
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Figure 14-1
The accompanying figure shows a(n) ____________________ operated float switch.
Fill in the blank(s) with the appropriate word(s).
Systems installed to protect loads such as communications, ventilation, or lighting systems that, when stopped, could create hazards or hamper rescue or fire-fighting operations are known as _____.
a. emergency systems b. legally required standby systems c. life safety systems d. essential systems
A ____ is a semiconductor device that allows electricity to flow in only one direction.
A. Resistor B. Diode C. Fuse D. Capacitor
Why are standard low-efficiency furnaces no longer manufactured?
A) The standing pilot flame safety devices were deemed too hazardous after several technicians were electrocuted while changing a thermocouple. B) Thermocouples proved to be an unreliable technology. C) They cannot provide the minimum 80 percent AFUE required by DOT. D) The thermocouple flame safety devices they use have not been thoroughly field tested.