July
2005, Issue 180
Test Your EQ
Each
month, Test Your EQ presents some basic engineering
problems for you to test your Engineering Quotient.
What's your EQ?
|
Problem
1—What
is a Josephson junction?
Answer
Problem
2—How can Josephson junctions be used as a voltage
standard?
Answer
Problem 3—The following power supply produces two
different voltages. If the transformer secondary is rated
at 10 V, what are the voltages found at +VA and
+VB?
Answer
Problem
4—If
D1 is replaced with a full wave bridge rectifier, as shown
below, what happens to the voltage at +VB? Does
it remain the same, become greater, or become smaller? Why?
Answer
Problem
5—What does the term “bias” refer to in the context
of magnetic recording? When is it used?
Answer
Problem
6—What is the difference
between DC bias and AC bias for magnetic recording?
Answer
Problem
7—Why does magnetic audio recording inherently
require equalization?
Answer
Problem
8—We have all been taught to have great respect
for the high voltages associated with CRTs (cathode-ray
tubes) and the fact that they can store energy for long
periods after being turned off. But how much energy are
we really talking about? Would, say, a 9-inch B&W
CRT like those used in classic Macintosh computers really
be considered lethal? What about a large modern color
TV set?
Answer
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