BOMA: Electrical Motor Controls CORRECT QUESTIONS & ANSWERS(GRADED A)
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Course
BOMA - Instrumentation & Controls
Institution
BOMA - Instrumentation & Controls
A holding contact or maintaining contact in a magnetic motor starter is normally connected in parallel with the? - ANSWER Stop push button, start push button, and starter coil
The armatures of both AC and DC contactors must move freely or? - ANSWER all the contacts may weld together
Which of ...
BOMA: Electrical Motor Controls CORRECT
QUESTIONS & ANSWERS(GRADED A)
A holding contact or maintaining contact in a magnetic motor starter is normally connected in parallel
with the? - ANSWER Stop push button, start push button, and starter coil
The armatures of both AC and DC contactors must move freely or? - ANSWER all the contacts may weld
together
Which of the following devices prevent motors from drawing too much current? - ANSWER overloads
The primary difference between a motor starter and a motor contactor is the starter has an? - ANSWER
overload protection
The purpose of a reduced motor is to? - ANSWER reduce voltage on motor starter
Two speed motors require 2 sets of overloads to monitor the motor heating characteristics at each
speed? - ANSWER true
Over current protection is provided for an electric motor to prevent damage to the windings from the
heating effect of excessive current? - ANSWER true
The current interrupting capability of a fuse breaker is to? - ANSWER the maximum amperage it should
conduct during normal operation
Reduce voltage starting is used as a means of? - ANSWER reducing the starting current
The speed of an AC squirrel cage motor can be changed by? - ANSWER Changing the number of poles
A short circuit ground fault device may consist of? - ANSWER A fuse and a circuit breaker
, A small size motor starter is given the designation of 00? - ANSWER True
How do you change the rotation of a three phase motor? - ANSWER Change any 2 of the 3 wires
The actual full load amps of a motor are found? - ANSWER Nameplate of the motor
The centrifugal switch of a single phase induction motor is connected in series with the ______
windings? - ANSWER start windings
Synchrononomous motors have? - ANSWER stator and magnetic force
Return overload current in reference to motor circuits refers to? - ANSWER Any load current that exceeds
rated motor current
A generator? - ANSWER Changes mechanical power into electrical power
A machine that converts mechanical power into electrical power is called a? - ANSWER A generator and
alternator
Distilled water should be added to a battery when? - ANSWER when level is below the plates
The electrical energy that a battery can deliver is measured in? - ANSWER amphours
When manually switching from normal to auxiliary power can be accomplished by? - ANSWER using an
automatic transfer switch
What are the three main components of an uninterruptible power supply? - ANSWER Rectifier, batteries,
inverter
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