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October 30, 2025, 12:59:06 pm

Poll

2010 Easy or hard?

Hard
8 (7.3%)
Medium-hard
30 (27.3%)
Medium
31 (28.2%)
Medium-easy
23 (20.9%)
Easy
18 (16.4%)

Total Members Voted: 101

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Author Topic: Was it easy or hard?  (Read 6246 times)  Share 

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m@tty

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Re: Was it easy or hard?
« Reply #30 on: November 10, 2010, 04:23:19 pm »
0
Ah I don't know.. I just thought that it was asking to outline all uses relevant to the course.

Makes sense though that they would accept only generators though. It was a 3 mark question, not 4 or 5.
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Blakhitman

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Re: Was it easy or hard?
« Reply #31 on: November 10, 2010, 04:25:51 pm »
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8th question of 09?

If yes then that's cause they said in the question that it was a DC motor.

This supports taiga's claim that there are two separate things to say, one for generator and one for motor. In today's exam it didn't say what so you would probably have had to mention for both.
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cipherpol

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Re: Was it easy or hard?
« Reply #32 on: November 10, 2010, 04:27:45 pm »
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in this year, the question was talking about generators and alternators though >< didn't mention motors
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kyzoo

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Re: Was it easy or hard?
« Reply #33 on: November 10, 2010, 04:30:24 pm »
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Quote
VCAA 2009 Question 8
Explain the purpose of the split-ring commutator.

Doesn't seem to specify there either =X
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2009
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m@tty

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Re: Was it easy or hard?
« Reply #34 on: November 10, 2010, 04:31:50 pm »
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Quote from: Blakhitman on November 10, 2010, 04:25:51 pm
8th question of 09?

If yes then that's cause they said in the question that it was a DC motor.

This supports taiga's claim that there are two separate things to say, one for generator and one for motor. In today's exam it didn't say what so you would probably have had to mention for both.

Wait yeah. Probably 1 mark for AC generator and slip rings explanation. Then 1 for DC generator and 1 for DC motor and if you failed to explain the commutator properly you lose a mark. I think.

EDIT: In 2009 the stem said "The following information relates to questions 5-8".

And I'm guessing it said something similar in this year's paper... So I don't know.
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taiga

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Re: Was it easy or hard?
« Reply #35 on: November 10, 2010, 04:36:13 pm »
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I would have thought 1 mark for slip ring use (with reference to image, mind you it said to use it for that question at the start), 1 mark for split ring use, and 1 mark for the difference between them, which should be implied in the "uses" bit.
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SixWinged

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Re: Was it easy or hard?
« Reply #36 on: November 10, 2010, 04:51:51 pm »
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AC motors would be limited to working at 50Hz (or the frequency of the input) and, from what I can work out, would be useless unless they started spinning at the exact point such that they hit 90 degrees at the same time the emf supply hits 0.
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Re: Was it easy or hard?
« Reply #37 on: November 10, 2010, 05:08:13 pm »
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the begining of this years paper this question also said this information refers to blah blah i checked, i just wrote commutators are used in dc generators and motors (but this questiond refers to generators)... hopefully good enough
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