In addition to starting, stopping and controlling the speed of a motor, the controller may be required to respond to a number of conditions. List four examples of these conditions.
What will be an ideal response?
Relays have been designed to respond to one or more of the following conditions: voltage, overvoltage, undervoltage, current, overcurrent, undercurrent, current direction, differential current, power (watts), power direction, volt-amperes, frequency, phase angle, power factor, phase rotation, phase failure, impedance, speed, or temperature.
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La configuración de alimentación debe desenrollar el cable:
a. en forma de S inversa. b. de modo circular. c. con una curvatura poligonal. d. según su curvatura natural.
A mound of soil graded to force runoff away from a structure is called
What will be an ideal response?
A 1Ø compressor (CSIR) has proper voltage, starts and runs for about 5 seconds, then goes out on overload. What is the most likely problem?
a. The start capacitor is bad. b. The compressor is locked up. c. The start relay contacts are stuck open. d. The start relay contacts are welded closed.
The two primary approaches to evacuating systems are known as the _____
a. deep vacuum and staged vacuum methods b. assisted vacuum and triple evacuation methods c. deep vacuum and triple evacuation methods d. assisted vacuum and staged vacuum methods