The rotor of a wound-rotor motor is constructed by winding coils on the rotor ____ degrees apart
a. 60
b. 90
c. 120
d. 180
c. 120
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Electronic voltage regulators use a temperature-sensitive resistor in the regulator circuit. This resistor, called a thermistor, provides lower resistance as the temperature __________
A) Decreases B) Doubles C) Increases D) Stays the same
With the compressor off, a technician compares the pressure of an air-cooled condenser with the pressure given on the PT chart for that refrigerant and temperature. The system pressure is considerably higher than the pressure indicated on the PT chart for that refrigerant and temperature. This indicates that:
A) The system has been undercharged. B) The system has been slightly overcharged. C) The system has been properly evacuated and charged. D) The system has noncondensable gases in it.
Thermal fastening is restricted to ____ and plastic materials.
A. metal B. wood C. cloth D. ceramic
Without a special ballast, fluorescent lamps installed in a garage usually will not start when exposed to temperatures below __________ degrees F.
a. 60 b. 50 c. 70 d. 80