What energy conversion does an electronic oscillator perform __________?
Show answer Hide answer
Answer: B. power into a.c. power
Explanation
Electronic oscillators draw direct current electrical power from an external battery or power supply. Internal circuit action converts this steady DC input into periodic alternating current output waveforms. Active devices act as switches or amplifiers to route energy into the resonant feedback circuit. Direct current flows in one constant direction while alternating current periodically reverses polarity. Conservation of energy requires that AC output power cannot exceed the supplied DC input power. Resonant circuits determine the specific frequency of the resulting alternating current output.
Power conversion efficiency is a key consideration in battery operated portable radio transmitters. Function generators convert DC bench power into various alternating current waveforms for testing. Inverters use similar power conversion principles to supply AC household power from DC batteries. Option A incorrectly suggests converting power into direct current instead of alternating current. Option C mentions mechanical power which is converted by generators rather than electronic oscillators. Option D is incorrect because the correct energy conversion process is stated in option B.
- Subject
- Engineering
- Category
- Electrical Engineering
- Topic
- —
- Difficulty
- medium
Related questions
Q1. What kind of signal output does an oscillator generate___________?
Show answer Hide answer
Answer: B. Undamped
An electronic oscillator is designed to produce continuous alternating current output signals without external input triggers. Undamped signals maintain a constant peak amplitude indefinitely over continuous operating ti...
Q2. With both inputs grounded, what is the ideal output voltage of an operational amplifier _______________?
Show answer Hide answer
Answer: C. equal to zero
An operational amplifier amplifies the voltage difference between its inverting and noninverting input terminals. When both inputs are connected to ground, the input voltage difference is zero volts. Multiplying a zero i...
Q3. What must the initial loop gain be around the feedback path for an oscillator to successfully start_________?
Show answer Hide answer
Answer: B. Greater than 1
Oscillators require an initial loop gain greater than one to ensure spontaneous signal startup from noise. Starting from microscopic thermal noise demands a gain boost to build up usable oscillation amplitudes. Once stea...
Q4. What components dictate the operating frequency of a phase-shift oscillator _______________?
Show answer Hide answer
Answer: C. R and C
Phase shift oscillators rely exclusively on resistors and capacitors within their feedback networks. The specific values of these resistors and capacitors determine the exact operating frequency of the circuit. Inductors...
Q5. How is common-mode gain characterized ________________?
Show answer Hide answer
Answer: B. very low
Differential amplifiers are engineered to suppress unwanted signals that appear simultaneously on both inputs. Keeping common mode gain very low ensures that noise picked up on both input lines is effectively ignored. A...
Q6. What operational improvements result from negative feedback_______________?
Show answer Hide answer
Answer: B. increases the input impedance and bandwidth
Applying negative feedback in series input configurations increases the overall input impedance significantly. Negative feedback also extends the usable frequency bandwidth by lowering closed loop gain peaks. This combin...