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General RF Electronics
RF Cafe Quiz #2

RF Engineering Quizzes - RF Cafe WebsiteAll RF Cafe Quizzes make great fodder for employment interviews for technicians or engineers - particularly those who are fresh out of school or are relatively new to the work world. Come to think of it, they would make equally excellent study material for the same persons who are going to be interviewed for a job. Bonne chance, Viel Glück, がんばろう, buena suerte, удачи, in bocca al lupo, 행운을 빕니다, ádh mór, בהצלחה, lykke til, 祝你好運. Well, you know what I mean: Good luck!

Click here for the complete list of RF Cafe Quizzes.

Note: Some material based on books have quoted passages.

1. On a Smith chart, what does a point in the bottom half of the chart represent?

a) An inductive impedance

b) A capacitive impedance

c) Power saturation

2. While we're on the subject of Smith charts, what is the impedance of the point at the far left edge of the center horizontal line?

a) Infinite ohms (open circuit)

b) Zero ohms (short circuit)

c) 50 ohm match

3. A single-conversion downconverter uses a high-side local oscillator (LO) to translate the input radio frequency (RF) to an intermediate frequency (IF). Will spectral inversion occur at IF?

a) Yes, always

b) No, never

c) Sometimes

4. What happens to the noise floor of a spectrum analyzer when the input filter resolution bandwidth is decreased by two decades?

a) 20 dB increase

b) 20 dB decrease

c) 40 dB decrease

5. What is a primary advantage of a quadrature modulator?

a) Low LO power required

b) Four separate outputs

c) Single-sideband output

6. What is meant by dBi as applied to antennas?

a) Isolation in decibels

b) Physical size relative to intrinsic antennas

c) Gain relative to an isotropic radiator

7. What is the power dynamic range of an ideal 12-bit analog-to-digital converter (ADC)?

a) 36.12 dB

b) 120 dB

c) 72.25 dB

8. An ideal 10 dB attenuator is added in front of a load that has a 2.00:1 VSWR. What is the resulting VSWR of the load + attenuator?

a) 1.07:1

b) 2.10:1

c) 12.0:1

9. What is the thermal noise power in a 1 MHz bandwidth when the system temperature is 15 degrees Celsius (assume gain and noise figure are 0 dB)?

a) -114.0 dBm (in a 1 MHz bandwidth)

b) -114.0 dBm

c) -114.0 dBm/Hz

10. Two equal amplitude tones have a power of +10 dBm, and generate a pair of equal amplitude 3rd-order intermodulation products at -20 dBm. What is the 2-tone, 3rd-order intercept point (IP3) of the system?

a) +40 dBm

b) +25 dBm

c) +20 dBm

Need some help? Click here for the answers and explanations.

Quizzes from vintage electronics magazines such as Popular Electronics, Electronics-World, QST, Radio-Electronics, and Radio News were published over the years - some really simple and others not so simple. Robert P. Balin created most of the quizzes for Popular Electronics. This is a listing of all I have posted thus far.

RF Cafe Quizzes

Vintage Electronics Magazine Quizzes

Vintage Electronics Magazine Quizzes
Johanson Technology Prototyping Kit - RF Cafe Website

About the RF Cafe™ Website ©1996-2026

Kirt Blattenberger - RF Cafe WebmasterRF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The World Wide Web (Internet) was largely an unknown entity at the time and bandwidth was a scarce commodity. Dial-up modems blazed along at 14.4 kbps while tying up your telephone line, and a lady's voice announced "You've Got Mail" when a new message arrived...

Webmaster: Kirt Blattenberger  |     BSEE - KB3UON - AMA92498  |  USAF Radar Technician

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