Test Your EQ
— Issue #152
Each month, Test Your EQ presents
some basic engineering problems for you to test
your Engineering Quotient. What's your EQ?
|
Problem 1—Reflection
that takes place at which of the following terminations
of a transmission line inverts the voltage of an incident
wave?
a. matched
b.
short circuit
c.
open circuit
d.
both b and c
Answer
Problem 2—The
bandwidth of a quarter-wave transformer is limited because
of what?
Answer
Problem 3—If
the SWR of a 250-kW shortwave transmitter at 12,025 kHz
is 1.6, then what is the reflected power?
Answer
Problem 4—How
are elevations reported by a GPS receiver?
•
Distance from the center of the earth
•
Distance above the geoid
•
Distance above a perfect sphere centered on the earth
Answer
Problem 5—With
GPS, is a P(Y)-code receiver (chip rate = 10.23 MHz) 10
times as accurate as a C/A-only code receiver (chip rate
= 1.023 MHz)? Why?
Answer
Problem 6—Is
it possible to transmit on-off (DC) signals between two
pieces of equipment in both directions simultaneously
on the same wire, in much the same way that telephones
do for audio?
Answer
Problem 7—But
doesn't a true hybrid use transformers, or at least some
tricky transformer simulation with op-amps to ensure the
transmitted signal does not appear on the receive port?
Answer
Problem 8—Which
of the following terminations gives a return loss value
of infinity for any transmission line?
a.
reactive
b.short
circuit
c.matched
d.open
circuit
e.both
b & c
Answer
Published March 2003
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