Segment 4 Quiz 2
thyristors
SCRs and GTOs are ___ and have the ability to handle more current
synchronous
___ motors are often made to have a leading power factor by over excitation of the rotor current
12.2
a one horsepower motor will have a full load current of ___ amperes when connected to DC
1200
a three phase motor contains six poles per phase. the synchronous speed of this motor is ___ RPM when connected to 60 Hz
brush
direct current compound motors contain a rotating armature and a ___ field
increased by 10%
if a synchronous type motor is operated at 90 percent power factor, the rated full load current in the table is to be ___
horsepower rating
in a machine that has a 3 phase motor rated at 460 volts, the current required on that machine is based on the motor ___
nine
most deal voltage motors bring out ___ "f" leads at the terminal box
split phase
most dual voltage single phase motors will be of the ___ type, which contains both run and starting windings
degrees
state the unit to measure coil span?
diode
the ___ operates like an electric check valve, it permits the current to flow through it in one direction
on the nameplate
the motor overload size is to be determined by using the current listed ___
synchronous
the speed of the rotating magnetic field of a polyphase oc motor is called ___ speed
resistance
the speed of the wound rotor induction motor can be controlled by the amount of ___ connected in the rotor circuit
in UL product directories
the temperature ratings of devices such as circuit breakers, fuses and terminals are found ___
in phase
the torque reaches maximum when the rotor and stator currents are ___ with each other
90
the voltages of the two phase system are ___ degrees out of phase of each other
delta
three phase motors can be constructed to operate in either way or ___
low speed high torque
two phase motors that are especially designed for ___ applications use the same rules for determining full load currents as single phase motors
high speed low torque
what is the general application for most motors?
156
what percentage of the full load current of a thermally protected continuous duty motor of more than one Hp can the trip current be, if the full load ampere is 15?
the square root of two
when a two phase, three wire system is used, the size of the neutral conductor must be increased by
430.248
which NEC table lists the running currents for single phase AC motors