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RF 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 typing up your telephone line, and a nice lady's voice announced "You've Got Mail" when a new message arrived...

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quiz 2 questions - RF Cafe Forums

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The Amplifier
 Post subject: quiz 2 questions
Posted: Fri Jan 05, 2007 11:00 am 
 
Captain
User avatar

Joined: Fri Jul 16, 2004 4:08 pm
Posts: 5
my contribution to the cause... :lol:

What is the energy stored ina 1 pF capacitor at the instantaneous peak voltage of a 1 kVrms source?
A: 1 microjoule
B: 1 picojoule
C: 1.4 picojoules
D: 1.4 microjoules


What is the lowest resonant frequency of a 1.5 meter transmission line that is shorted at both ends?
A: 75 MHz
B: 100 MHz
C: 150 MHz
D: 300 MHz


What is the peak-to-peak Voltage of a 100 Vrms signal sine-wave?
A: 140 V
B: 170 V
C: 200 V
D: 283 V


What is the output power of a linear amplifier with a gain of 20 dB and a sine-wave input of 10 mW?
A: 30 dBm
B: 20 dBm
C: 40 dBm
D: 10 Watts


What is the inductive reactance, expressed in ohms, of a 10 mH coil at 1 MHz?
A: 62.8
B: 628
C: 6.28k
D: 62.8k


What is the capacitive reactance, expressed in ohms, of a 0.01 uF capacitor at 16 MHz?
A: 0.1
B: 0.5
C: 1
D: 2


If the input VSWR of a system is 2:1, what is the approximate return loss in dB?
A: 20
B: 10
C: 5
D: 2


If a wave transformer could match a load of 20 ohms to 5 ohms, what is the characteristic impedance transformer line?
A: 18 ohms
B: 14 ohms
C: 7 ohms
D: 10 ohms


Which S-parameter is used in the calculation of Input Return Loss?
A: S11
B: S12
C: S21
D: S22


What is the peak voltage of a 1kVrms sine-wave?
A: 200 V
B: 1400 V
C: 2800 V
D: 1700 V





Posted  11/12/2012
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