motor load
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ramsy
NoFixNoPay Electric
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- LA basin, CA
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- Service Electrician 2020 NEC
Charlie B., used to handle these questions quite nicely.
You may get better answeres in the Exam.Prep. forum, because most people here know motor theory also involves power factor, reactance, henrys, etc.. Answering this can lead to a lot more questions, creating unpaid-teaching duty of students who need proper study material, and text books.
A great book to start with is Delmar's Standard Textbook of Electricity (Herman). ISBN 0-8273-8646-X (NJATC Edition). Got mine used for half retail cost, either at eBay.com, BN.com, or Amazon.com.
Many of us here still use our orignial text books, and reference them all the time. My point is you can't properly start without yours..
You may get better answeres in the Exam.Prep. forum, because most people here know motor theory also involves power factor, reactance, henrys, etc.. Answering this can lead to a lot more questions, creating unpaid-teaching duty of students who need proper study material, and text books.
A great book to start with is Delmar's Standard Textbook of Electricity (Herman). ISBN 0-8273-8646-X (NJATC Edition). Got mine used for half retail cost, either at eBay.com, BN.com, or Amazon.com.
Many of us here still use our orignial text books, and reference them all the time. My point is you can't properly start without yours..
got-
Roger is right. Your question looks like you're looking for an answer to memorize. If you want to understand, you're going to have to open the books.
However, to answer your question: If those are your only three choices, it's, "impudense or something like that".
carl
Roger is right. Your question looks like you're looking for an answer to memorize. If you want to understand, you're going to have to open the books.
However, to answer your question: If those are your only three choices, it's, "impudense or something like that".
carl
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I'm thinking it is not pure inductive. Here's why:bob said:
Windage, friction, and the mechanical power out the end of the shaft shows up as resistive.
So, there is the inductive part and the resistive part. Pf is nominally .85 to .90.
That is why I would say the load is combination - an impedance.
Of course, this may not have anything to do with getting a test question correct.
carl
LarryFine
Master Electrician Electric Contractor Richmond VA
- Location
- Henrico County, VA
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- Electrical Contractor
Carl, I don't believe that Bob's intent was that it is a 100%-reactive load, only that the impedance was (partly) reactive in the inductive direction. There are very few loads indeed with no resistive component.
Larry - Absolutely true - and I knew Bob knew that. Okay, I don't know, but I'm pretty sure.
If someone were to ask me, "What sort of a load is a motor?" - cold, no context. I'd likely say inductive - meaning, as you said, it's a lagging pf.
However, in the context of the three choices we were given, then the answer changes.
Love them test questions worded such that the answer is only in the author's book.
carl
If someone were to ask me, "What sort of a load is a motor?" - cold, no context. I'd likely say inductive - meaning, as you said, it's a lagging pf.
However, in the context of the three choices we were given, then the answer changes.
Love them test questions worded such that the answer is only in the author's book.
carl
ramsy
NoFixNoPay Electric
- Location
- LA basin, CA
- Occupation
- Service Electrician 2020 NEC
I like this one best; besides multi-choice testing strategies advise going with your first choice, since statistics show the fudge marks left by erasures were usually the right choice anyway.coulter said:
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