MCQOPTIONS
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MCQOPTIONS
This section includes 7 Mcqs, each offering curated multiple-choice questions to sharpen your Electronic Devices and Circuits Questions and Answers knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
In designing with op amps one has to check the limitations on the voltage and frequency ranges of operation of the closed-loop amplifier, imposed by the op-amp finite bandwidth (ft), slew rate (SR), and output saturation (Vo max). Consider the use of an op amp with ftt = 2 MHz, SR = 1 V/µs, and V0 max = 10 V in the design of a non-inverting amplifier with a nominal gain of 10. Assume a sine-wave input with peak amplitude Vi. If f = 20 kHz, what is the maximum value of Vi before the output distorts? |
| A. | 0.397 V |
| B. | 0.795 V |
| C. | 1.192 V |
| D. | 1.590 V |
| Answer» C. 1.192 V | |
| 2. |
In designing with op amps one has to check the limitations on the voltage and frequency ranges of operation of the closed-loop amplifier, imposed by the op-amp finite bandwidth (ft), slew rate (SR), and output saturation (Vo max). Consider the use of an op amp with ftt = 2 MHz, SR = 1 V/µs, and V0 max = 10 V in the design of a non-inverting amplifier with a nominal gain of 10. Assume a sine-wave input with peak amplitude Vi. If Vi = 0.5 V, what is the maximum frequency before the output distorts? |
| A. | 31.8 kHz |
| B. | 318 kHz |
| C. | 3.18 kHz |
| D. | 3.18 MHz |
| Answer» B. 318 kHz | |
| 3. |
An op amp having a slew rate of 20 V/µs is to be used in the unity-gain follower configuration, with input pulses that rise from 0 to 3 V. What is the shortest pulse that can be used while ensuring full-amplitude output? |
| A. | 0.10 µs |
| B. | 0.15 µs |
| C. | 0.20 µs |
| D. | 0.30 µs |
| Answer» C. 0.20 µs | |
| 4. |
For operation with 10-V output pulses with the requirement that the sum of the rise and fall times represent only 20% of the pulse width (at half amplitude), what is the slew-rate requirement for an op amp to handle pulses 2 µs wide? (Note: The rise and fall times of a pulse signal are usually measured between the 10%- and 90%-height points.) |
| A. | 10 V/µs |
| B. | 20 V/µs |
| C. | 40 V/µs |
| D. | 80 V/µs |
| Answer» D. 80 V/µs | |
| 5. |
A particular op amp using ±15-V supplies operates linearly for outputs in the range −12 V to +12 V. If used in an inverting amplifier configuration of gain –100, what is the rms value of the largest possible sine wave that can be applied at the input without output clipping? |
| A. | 120 mV |
| B. | 60 mV |
| C. | 84.85 mV |
| D. | 42.42 mV |
| Answer» D. 42.42 mV | |
| 6. |
The full-power bandwidth, fM, is the maximum frequency at which |
| A. | an output sinusoid with an amplitude equal to the op-amp rated output voltage (Vo max) can be produced without distortion |
| B. | it is the range of the frequencies in which the amplitude of output signal is equal to or greater than half of the op-amp rated output voltage |
| C. | it is the range of the frequencies in which the amplitude of output signal is equal to or less than half of the op-amp rated output voltage |
| D. | It is the range of the frequencies in which the power gain is half or more than half of the maximum rated power gain of the op-amp |
| Answer» B. it is the range of the frequencies in which the amplitude of output signal is equal to or greater than half of the op-amp rated output voltage | |
| 7. |
Determine the slew rate of the amplifier having full power bandwidth f0 and the rated output voltage as V0. Given that the input signal is of sinusoidal nature. |
| A. | 2πf0 V0 |
| B. | V0 / 2πf0 |
| C. | V0 / f0 |
| D. | f0 V0 |
| Answer» B. V0 / 2πf0 | |