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Trying to prove a point

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garethw:
D. [emoji3]


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Mechatrommer:

--- Quote from: CoopedUp on June 07, 2019, 03:05:14 am --- :blah: he says the only correct answer is c and refuses to accept that he is wrong, and let me tell you it's not the only question he made that had several correct answers... He's such a stubborn guy... I like him as a person just not as a teacher

--- End quote ---
i'm a teacher by proffesion for already 15 years. my answer is that, thats not a good question, its called ambiguous question. since in order to actuate a switch (relay) you need to apply power, hence not actuated = power not applied, answer either C or D should be correct (from my understanding and experience). the problem with teacher, esp young teachers, albeit they are good at teaching, not necessarily good at making questions. good questions need to be peer reviewed, if we get different answers from different teachers in the same subject, that means its a flag that the question is ambiguous. different students/readers have different experience, we need to rule that out so everybody with good knowledge from various discipline should end up with the same answer. if ambiguous questions already given to students in a test we teachers in the panel usually end up with 2 or more correct answers before marking. tell this to your teacher, or better tell this to the other teachers in the same subject so they can advice their peer. some teachers are usually too ego to get advice from their student. ymmv.

dietert1:
No, a switch can be actuated by other means. For example end position/calibration switch in a machine, alarm system reed switch and power button of a notebook. Each one is a NO or NC switch.

Regards, Dieter

DDunfield:

--- Quote from: CoopedUp on June 07, 2019, 03:05:14 am ---he says the only correct answer is c and refuses to accept that he is wrong, and let me tell you it's not the only question he made that had several correct answers... He's such a stubborn guy... I like him as a person just not as a teacher

--- End quote ---

The only way I could see this being even partially correct is because the original question says "electrical state".

A normally-open button, not pressed has it's contacts open whether or not power is applied.
A normally-closed button not pressed has it's contacts closed whether or not power is applied.

It appears your teacher is looking at it in terms of current flow (electrical state?):

N.O. button is an open circuit when power is applied.
N.C. button is a closed circuit when power is applied.

A "trick" question that has very little to do with actual knowledge.

EDIT: Just re-read the original, C is "power is NOT applied". So I don't see any way for C to make sense. The above would argue (albeit weakly) for A "Power is applied".

Dave

exe:
I don't like such questions. Why can't they put it as "what is default state of a normally open (momentarily) switch"? Looks like they over-complicate things just to pan students. Why doing this? Give knowledge, not frustration.

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