Exam (elaborations)
Electric Motor Control Final Exam 2023 Q&A
- Course
- Institution
Electric Motor Control Final Exam 2023 Q&A
[Show more]
Seller
Follow
Studyhall
Reviews received
Content preview
Electric Motor Control Final Exam 2023 Q&Amotor connections factors ✔️ horsepower, service factor,marked
temperature rise, voltage, full load current rating and nema code letter
Synchronous motor advantage ✔️ they can provide power factor
correction for themselves
Squirrel cage induction motors are used ✔️ to power most of the
machines throughout industry
motor starters can be divided into two classes ✔️ IEC and NEMA
NEMA starters range ✔️ 00-8
NEMA size 00 ✔️ is rated to control a 2-horsepower motor connected to a
460 volt, three phase power supply
NEMA size 8 ✔️ Will control a 900 horsepower motor connected to a 460
volt, three phase power supply
semiautomatic controls ✔️ characterized by the use of push buttons, limit
switches, pressure switches and other sensing devices to control
manual controls ✔️ simple devices that are hooked onto the line of a
motor
Automatic controls ✔️ similar to semiautomatic controls but operator
does not have to initiate control
across the line starting ✔️ accomplished by connecting the motors
directly to the power line
ramping ✔️ requires a motor to start at a low speed and accelerates to full
speed over time
Simplest method of stopping ✔️ disconnect power line
, Normally open push button ✔️
Normally closed push button ✔️
When components are shown connected by a dashed line in a schematic
diagram ✔️ it indicates that the components are mechanically connected
together
Normally open liquid flow switch ✔️
float switch ✔️
temperature switch ✔️
disconnect switch ✔️
circuit breaker ✔️
on delay timer ✔️
Current transformer ✔️
air core transformer ✔️
Dual voltage transformer ✔️
Auto transformer ✔️
First step of trouble shooting ✔️ determine whether the motor is
overloaded
Shorted windings in the motor ✔️ can cause the motor to draw excessive
current
Current flow in a 3 phase motor should ✔️ all be the same
manual starters that are installed in a switch box ✔️ more susceptible to
ambient temperature problems
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 Studyhall. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $13.99. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
75632 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now