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DCAC Chap 2 Flashcards _ QUESTIONS WITH 100- CORRECT ANSWERS!!.pdf
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DCAC Chap 2 Flashcards _ QUESTIONS WITH 100- CORRECT ANSWERS!!.pdf
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DCAC Chap 2Jeremiah
Terms in this set (19)
constant horsepower Speed and torque are inversely proportional in ___ loads.
green The color ___ always indicates a conductor used for grounding.
farads the unit of capacitance is ?
Common causes of ___ include a blown fuse, a mechanical failure within the switching
single phasing
equipment, or a lightning strike
___ is the property of a circuit that causes it to oppose a change in current due to energy
inductance
stored in a magnetic field of a coil.
120/208 V, 3Φ, 4 wire A ___ service is used to provide large amounts of low-voltage (120 V, 1Φ) power
B Class ___ motors are the most widely used motor type.
Pull-up ___ torque is the torque required to bring a load up to its rated speed.
work ___ is a force (measured in lb) applied at a distance (measured in ft).
Adding ___ cleans and reduces the amount of current that causes damage when
impedance
transient voltages occur.
torque _ ___ may exist even when no movement occurs.
starting _ ___ torque is also referred to as acceleration torque
the _____ of a motor determines what size load a motor can operate and how fast the
horsepower
load rotates
All coils (motor windings, transformers, solenoids) create _____ in an electrical circuit
inductance
and oppose change in current
_ __ unbalance is the unbalance that occurs when the three phase powerlines are more
voltage
or less than 120 degrees out of phase
Single Phasing ____ is the operation of a 3 phase load on 2 phases because one phase is lost
does not A grounding conductor is a conductor that______ normally carry out current
3 phase power supply Connecting an electric motor drive to a ______ is always recommended
improper phase sequence _ ___ reverses rotation in a 3 phase motor
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