[Systems Engineering Teachers' Mailing List] RE: syseng Digest, Vol 28, Issue 12 Practice exam errors

[Barton, Paul S]

I have asked Lorraine Tran and Kristen Allen for an answer sheet to the practice exam questions over 4 months ago, as I also found problems with the practice exam. I agree with your findings on questions 6,7,11, question 9 I'll defer to your Knowledge. I also asked about question 5 (subjective), Question 3 (formula should be Force= pressure X area), section B q1,I found I needed 3 pads and q12 the speed would be the minimum as the drum diameter increases so would the speed. I have also stated the correct vr ratio should be driven over driver if we are to comply with industry standards.
 
Paul Barton
Technology teacher
Dromana Secondary College

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Sent: Mon 10/29/2007 12:00 PM
To: syseng at edulists.com.au
Subject: syseng Digest, Vol 28, Issue 12



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Today's Topics:

   1. Practice Exam errors (Robert Minato)


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Message: 1
Date: Mon, 29 Oct 2007 09:43:06 +1000
From: Robert Minato <rminato at ccw.vic.edu.au>
Subject: [Systems Engineering Teachers' Mailing List] Practice Exam
        errors
To: "syseng at edulists.com.au" <syseng at edulists.com.au>
Message-ID: <7878124.6681193611395403.JavaMail.root at localhost>
Content-Type: text/plain; charset=US-ASCII

Had a look at the new practice exam on the vcaa website. There are a few
problems with it:

Section A
Q6. Symbol for a voltage reg is not on the vcaa symbols list. Responses A, B
and D all represent another component, so by default, Response C is left
which must be the correct answer.
Q7. 120 and 600 Ohm in parallel gives 100 Ohms. 12V/100Ohms = 120 mA. No
correct response.
Q11. Brown Green Yellow resistor is 150 kOhms. No correct response.

Section B
Q9. The motor will only ever rotate in one direction. The back emf diode
will be forward biased in one switch position effectively shorting across
the motor. [Depending on the current supply and diode rating, the diode may
burn-out, in which case the motor will then work in the second direction.
Back emf diodes normally used when other components (eg transistor) are in
circuit to prevent damage.]

Formula sheet
The resistor colour code needs a multiplier column. Unless a great deal of
time has been spent with the code, most students would nave some trouble
with the multiplier. Probably explains the confusion with Section A Q11.

Rob


--
Robert Minato
Technology Leader
Catholic College Wodonga
1 Bowman Crt
Wodonga 3690
02 6043 5546




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