Exam (elaborations)
BOMA. Electrical Motor Controls Questions and Answers 2024
- Course
- Institution
BOMA. Electrical Motor Controls
[Show more]
Content preview
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
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller julianah420. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $14.49. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
77254 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now