BOMA: Electrical Motor Controls CORRECT QUESTIONS & ANSWERS(GRADED A)
0 view 0 purchase
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
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 shantelleG. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $10.99. You're not tied to anything after your purchase.