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Module 1. Mathematics
Choose the correct statement
•  sec^2 * x + tan^2 * x = 1
•  cosec^2 * x - cot^2 * x = 1
•  cos^2 * x - sin^2 * x = 1

gav_18s asking:
•  Can anyone explain this?

Community comments: 0
Module 1. Mathematics
A blueprint shows a hole of 0.3751 to be drilled. What fraction size drill bit is most nearly equal?
•  3/16
•  5/16
•  3/8

dly5245 asking:
•  how to solve

Community comments: 5
Module 3. Electrical fundamentals
If the frequency to a capacitor increases, the current through it
•  decreases.
•  increases.
•  is zero.

obrien99 asking:
•  if the formula for capacitive reactance is 1/2piFC
then as frequency increases capacitive reactance would decrease
this would in turn allow more current to flow?


Community comments: 2
Module 3. Electrical fundamentals
An example of a paramagnetic material is
•  silver.
•  iron.
•  glass.

obrien99 asking:
•  Surely this is incorrect too.
iron would fall into the ferromagnet group
silver would fall into the diamagnetic group
glass would fall into the paramagnetic group


Community comments: 2
Module 3. Electrical fundamentals
The average value of 100 volts peak AC is
•  70.7 volts.
•  141. 4 volts.
•  63.7 volts.

obrien99 asking:
•  I think this might be incorrect.
i assume the question is looking for the rms value?
the formula for rms is -
peak voltage x 0.707
or
peak voltage / 1.414

both formulas give 70.7 as the answer

am i missing something?


Community comments: 2
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