What is reactor starting?
What will be an ideal response?
A reactor starter is the same basic control except that reactors or choke coils are used to limit in-rush current instead of resistors. Reactors limit in-rush current with inductive reactance instead of resistance. Reactors have an advantage in current-limiting circuits because of the rise time of current in an inductive circuit. In a resistive circuit, the current will reach its full Ohm's Law value instantly. In an inductive circuit, the current must rise at an exponential rate. This exponential rise time of current further reduces the in-rush current.
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When you "zoom in" by changing the focal length of the lens, the shot gets:
a. wider on the subject b. tighter on the subject c. brighter d. darker
Identify two of the major advantages fish have over other agricultural animals
What will be an ideal response?
Which of these terms is used to describe is the number of degrees of crankshaft rotation for which the valve is lifted off the seat?
A) Overlap B) Lift C) Duration D) Underlap
During an operational check of an air-conditioning system, you should check the:
A) Oil on the lines or pipe insulation. B) Temperature rise across the evaporator. C) Voltage drop on the power wire to the unit. D) Temperature drop across the condenser.