License Exam Quiz #361

de Steve, AE8AT 

March has a well loved holiday celebrated in many countries. Of course, I’m referring to Pi Day! While some among us may prefer to celebrate Tau Day, I think we are united on the idea that any excuse for pie is an excuse for pie!  Anyone planning to celebrate Pi Day at the most Pi-ous(?) moment at 3/14 15:55:35.4? For those wondering, that was 3.14159265 using the 3.1415 directly, then taking 92.65% of the 3600 seconds to arrive at 55 minutes, 35.4 seconds.  Those who have memorized Pi to 100 digits, please correct the glaring inaccuracy and provide a Thursday Night talk on how you will slice pie to the more exacting precision.

T9A12 What is an advantage of a 5/8 wavelength whip antenna for VHF or UHF mobile service?

A. It has more gain than a 1/4-wavelength antenna

B. It radiates at a very high angle

C. It eliminates distortion caused by reflected signals

D. It has 10 times the power gain of a 1/4 wavelength whip

G5A09 What unit is used to measure reactance?

A. Farad

B. Ohm

C. Ampere

D. Siemens

E9G02 What type of coordinate system is used in a Smith chart?

A. Voltage circles and current arcs

B. Resistance circles and reactance arcs

C. Voltage chords and current chords

D. Resistance lines and reactance chords

Answers:

T9A12 = A. (The equation for gain includes pi)

G5A09 = B. (Inductive reactance = X = 2 pi * f * L)

E9G02 = B. (Reactance again! And because everyone loves a Smith chart)