Exam (elaborations)
Electric Motors Controls BOMA Pre-Quiz Questions with Accurate Answers
- Course
- Institution
Electric Motors Controls BOMA Pre-Quiz
[Show more]
Content preview
Electric Motors Controls BOMA Pre-QuizHow does a U.P.S. (Uninterruptible power supply) work? - answerAC rectified to DC
batteries then Inverted to AC
Batteries energy capacity is measured in? - answerAmp-hours
Batteries have two rated values. - answerVoltage and amp-hours
How do you top off water in a battery cell? - answerDistilled water when the level is
below the plate.
A voltage monitor relay is used for? - answerStarting backup generators.
Fuel for diesel generators is often stored in a? - answerDay tank
_____ converts between electrical and mechanical power. - answerMotor, Generator,
alternator.
The field winding on a generator: - answerProduces the magnetic field.
The stationary members of a generator is called a - answerStator
A motor - answerConverts electrical energy into mechanical energy.
an armature is - answerThe movable portion of a contractor.
In a process control, delay is: - answerThe time it takes for a change in the process to
be felt.
What is the difference between a contactor and a starter? - answerA starter has
overload protection
How is a holding circuit wired? - answerStop push buttons I series,
Start push buttons in parallel,
Using a holding contact.
What protects circuits from short circuits? - answerBreakers
Soft-starts work by? - answerLowering voltage during start up
, When a starter has a built in disconnect, we call it a? - answerCombination starter
Normally closed means? - answerThere is continuity when the component is on the
shelf
What is an example of a P.E. Switch? - answerPressure operated electric switch.
The input and output power of a transformer is rated in? - answerKVA
A soft start is used to? - answerReduce starting current
AC motor speed is determined by? - answerThe number of poles.
DC arcs. - answerAre the most difficult to extinguish.
Arc chutes. - answerHelp confine the arcs.
The lower the NEMA rating on a contactor - answerThe lower the current it can handle
The current rating of a contactor. - answerThe max current for each contact.
A contactor with two sets of contacts is? - answer2 pole contactor
How do overloads protect a motor? - answerPreventing excessive heating effects of
high current
A double-break contacts function is to reduce the current of each arc. - answerTrue
Overloads which have a delay in reacting to high current is? - answerTo prevent tripping
during the starting period
What is used when it is necessary to control a high power or high voltage circuit with a
low power circuit - answerReplays
Time delays on ATS systems can be done by using? - answerOil dashpots
What consists of an electromagnetically inductive coil, wound around a movable steel or
iron slug? - answerSolenoid
A latching circuit consists of? - answerStart and stop push buttons.
The smallest size motor starter is? - answerNEMA rating 00
Providing isolation from hazardous voltages and preventing starting by partial ground
faults can be done by using!? - answerTransformers
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 $15.99. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
79223 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now