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General RF Knowledge
RF Cafe Quiz #1

RF Engineering Quizzes - RF CafeAll 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. What is the impedance of free space?

a) 50 Ω

b) 120π  Ω

c) 75 Ω

 

2. What happens to the noise figure of a receiver when a 10 dB attenuator is added at the input?

a) Noise figure increases by 10 dB

b) Noise figure decreases by 10 dB

c) Noise figure doesn't change

 

3. An RF system has a linear throughput gain of +10 dB and an output 3rd-order intercept point (OIP3) of +30 dBm. What is the input 3rd-order intercept point (IIP3)?

a) +20 dBm

b) +40 dBm

c) +30 dBm

 

4. Which filter type has the greatest selectivity for a given order (i.e., N=5)?

a) Bessel

b) Chebyshev (ripple=0.1 dB)

c) Butterworth

 

5. Which mixer spurious product is a 5th-order product?

a) 1*LO + 5*RF

b) 6*LO - 1*RF

c) 3*LO - 2*IF

 

 

6. A 2.8 GHz oscillator is phase-locked to a 10 MHz reference oscillator that has a single-sided phase noise of -100 dBc at 1 kHz offset. What is the single-sided phase noise of the 2.8 GHz oscillator at 1 kHz offset?

a) -48.6 dBc

b) -100 dBc

c) -51.1 dBc

 

7. What is the power of a 2 Vpk-pk sine wave across a 50 ohm load?

a) -20.0 dBm

b) +10.0 dBm

c) +19.0 dBm

 

8. Which 2-port S-parameter is commonly referred to as "reverse isolation" in an amplifier?

a) S21

b) S22

c) S12

 

9. What are the minimum and maximum combined VSWR limits at an interface characterized by a 1.25:1 VSWR and a 2.00:1 VSWR?

a) 1.75:1 (min), 2.25:1 (max)

b) 1.60:1 (min), 2.50:1 (max)

c) 0.75:1 (min), 3.25:1 (max)

 

10. An ideal directional coupler has a directivity of 25 dB and an isolation of 40 dB. What is its coupling value?

a) 65 dB

b) 40 dB

c) 15 dB

 

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

 
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