73,

Mark, N8ME

Repeater Quiz 275

de Steve, AE8AT

We spent the last few weeks on the questions that are being retired from use. With a whole new selection of Extra pool questions, let’s find a selection that are all brand new!

E6F02 What happens to photoconductive material when light shines on it?
A. Resistance decreases
B. Resistance increases
C. Reflectivity increases
D. Reflectivity decreases


E7D02 How does a switchmode voltage regulator work?
A. By alternating the output between positive and negative voltages
B. By varying the duty cycle of pulses input to a filter
C. By varying the conductivity of a pass element
D. By switching between two Zener diode reference voltages


E9C05 What is the purpose of feeding an off-center-fed dipole (OCFD) between the center and one end instead of at the midpoint?
A. To create a similar feed point impedance on multiple bands
B. To suppress off-center lobes at higher frequencies
C. To resonate the antenna across a wider range of frequencies
D. To reduce common-mode current coupling on the feed line shield



Answers:
E6F02 = A
E7D02 = B
E9C05 = A