[Systems Engineering Teachers' Mailing List] Practice Exam errors

[Alex Roujnikov]

Hi fellow SE teachers,
 
1. It was easy to pick up mistakes in trial Exam paper. My year 12 students found them and we discussed questions in class. It may sound weird but errors stimulated our work and increased interest to the Exam preparation. Paper is fresh and not dull. SE teachers were also alert and interested in the discussion.
 
2. The trial Exam paper, published for the first time in this subject as far as I know, is an excellent attempt to set a good standard, improve the rating of the subject and stimulate discussion before the Exam. We need to encourage those people who wrote it to publish more, may be with some editorial work from SE teachers before final publication.
 
Thank you for the paper, good standard and very relevant to the subject at last.
 
Regards, Alexandre Roujnikov,
 
Physics and SE teacher,
Penola Catholic College.
 
 

________________________________

From: syseng-bounces at edulists.com.au on behalf of Robert Minato
Sent: Mon 10/29/2007 10:43 AM
To: syseng at edulists.comand ..au
Subject: [Systems Engineering Teachers' Mailing List] Practice Exam errors



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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