Exam (elaborations)
BOMA. Electrical Motor Controls Questions and Answers 2024
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BOMA. Electrical Motor Controls
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BOMA. Electrical Motor ControlsA holding contact or maintaining contact in a magnetic motor starter is normally
connected in parallel with the? - answerStop push button, start push button, and starter
coil
The armatures of both AC and DC contactors must move freely or? - answerall the
contacts may weld together
Which of the following devices prevent motors from drawing too much current? -
answeroverloads
The primary difference between a motor starter and a motor contactor is the starter has
an? - answeroverload protection
The purpose of a reduced motor is to? - answerreduce voltage on motor starter
Two speed motors require 2 sets of overloads to monitor the motor heating
characteristics at each speed? - answertrue
Over current protection is provided for an electric motor to prevent damage to the
windings from the heating effect of excessive current? - answertrue
The current interrupting capability of a fuse breaker is to? - answerthe maximum
amperage it should conduct during normal operation
Reduce voltage starting is used as a means of? - answerreducing the starting current
The speed of an AC squirrel cage motor can be changed by? - answerChanging the
number of poles
A short circuit ground fault device may consist of? - answerA fuse and a circuit breaker
A small size motor starter is given the designation of 00? - answerTrue
In a process control, the time it takes for a change in the process to be felt at the
measuring device is called? - answerdelay
A relay is a device that can transfer an action from one circuit to another without an
electrical connection between the two circuits? - answerTrue
, What is meant by EP switch? - answerElectric Pneumatic operated switch
When using a fuse jumper for troubleshooting, be sure never to connect the jumper
between? - answerL1 and L2
The first thing to check when a system is down and won't run at all is? - answerThe AC
power supply
Improper alignment of the pole faces can cause excessive hum in a AC electromagnetic
or solenoid? - answerTrue
To indicate a good diode an ohm meter should? - answerLow resistance in one
direction and high resistance in the other direction
Unbound resistance readings between the windings of a three-phase motor indicates
the motor windings may? - answerBe breaking down
A motor control circuit that allows the motor to automatically start after power is restored
provides low voltage release? - answerIs said to be wired across the line is provided
What determines the speed of an induction motor? - answerNumber of poles
What is made when an electric current flow through the turns of a coil? - answerA
magnetic field
Rheostats are generally used in a motor controls for? - answerSpecially designed
motors
How do you change the rotation of a three phase motor? - answerChange any 2 of the 3
wires
The actual full load amps of a motor are found? - answerNameplate of the motor
The centrifugal switch of a single phase induction motor is connected in series with the
______ windings? - answerstart windings
Synchrononomous motors have? - answerstator and magnetic force
Return overload current in reference to motor circuits refers to? - answerAny load
current that exceeds rated motor current
A generator? - answerChanges mechanical power into electrical power
A machine that converts mechanical power into electrical power is called a? - answerA
generator and alternator
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