NEMA three-phase motors normally use open-ended lead wires marked with the ____ label system in the conduit box.
a. B
b. D
c. S
d. T
d. T
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Answer the following statement(s) true (T) or false (F)
1. One advantage of low-voltage thermostats is that they are safer to use inside the home. 2. Dirt around an open-contact thermostat is usually a minor issue. 3. Thermostats are not currently designed to be used for both heating or cooling applications. 4. Many thermostats are designed to permit manual control of the blower fan. 5. The cooling anticipator is a resistive heating element that operates in an opposite sense to the heat anticipator.
Which of the following statements about PTC heaters is not true?
A. Some vehicles have a PTC heating element in the heater core.
B. Some vehicles have a PTC element installed in an air duct from the blower housing to increase the air temperature in the ducts.
C. PTC heaters are electronically controlled and work with the cooling system to provide hot coolant.
D. PTC elements are small ceramic stones that react quickly to changes in current.
Avoid exposing a lead-acid battery to _____
a. temperatures below 50°F (10°C)
b. sparks or arcs of any type
c. more than two hours of use each day
d. nitrogen
An open internal motor overload is distinguished by:
A) Infinite resistance between start and common. B) Measurable resistance between run and start. C) Infinite resistance between run and common. D) All of these.