MCQOPTIONS
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MCQOPTIONS
This section includes 194 Mcqs, each offering curated multiple-choice questions to sharpen your Electronics knowledge and support exam preparation. Choose a topic below to get started.
| 151. |
If the input to a comparator is a sine wave, the output is a: |
| A. | ramp voltage |
| B. | sine wave |
| C. | rectangular wave |
| D. | sawtooth wave |
| Answer» D. sawtooth wave | |
| 152. |
This circuit is a bandpass filter. |
| A. | 1 |
| B. | |
| Answer» B. | |
| 153. |
The input offset current equals the |
| A. | average of two base currents |
| B. | collector current divided by the current gain |
| C. | difference between two base-emitter voltages |
| D. | difference between two base currents |
| Answer» E. | |
| 154. |
A portion of the output that provides circuit stabilization is considered to be: |
| A. | negative feedback |
| B. | distortion |
| C. | open-loop |
| D. | positive feedback |
| Answer» B. distortion | |
| 155. |
The major difference between ground and virtual ground is that virtual ground is only a: |
| A. | voltage reference |
| B. | current reference |
| C. | power reference |
| D. | difference reference |
| Answer» B. current reference | |
| 156. |
With a differential gain of 50,000 and a common-mode gain of 2, what is the common-mode rejection ratio? |
| A. | –87.9 dB |
| B. | –43.9 dB |
| C. | 43.9 dB |
| D. | 87.9 dB |
| Answer» E. | |
| 157. |
The closed-loop voltage gain of an inverting amplifier equals: |
| A. | the ratio of the input resistance to the feedback resistance |
| B. | the open-loop voltage gain |
| C. | the feedback resistance divided by the input resistance |
| D. | the input resistance |
| Answer» D. the input resistance | |
| 158. |
With negative feedback, the returning signal |
| A. | is proportional to the output current |
| B. | is proportional to the differential voltage gain |
| C. | opposes the input signal |
| D. | aids the input signal |
| Answer» D. aids the input signal | |
| 159. |
The feedback resistor adds to the gain of an op-amp. |
| A. | 1 |
| B. | |
| C. | 1 |
| D. | |
| Answer» C. 1 | |
| 160. |
Decreasing the gain in the given circuit could be achieved by |
| A. | reducing the amplitude of the input voltage |
| B. | increasing the value of the feedback resistor |
| C. | increasing the value of the input resistor |
| D. | removing the feedback resistor |
| Answer» D. removing the feedback resistor | |
| 161. |
If the two inputs to a differential amplifier are exactly the same, then the output is the signal multiplied by two. |
| A. | 1 |
| B. | |
| Answer» C. | |
| 162. |
Switching voltage regulators have ______ than linear regulators. |
| A. | longer life |
| B. | simpler circuitry |
| C. | greater efficiency |
| D. | lower cost |
| Answer» D. lower cost | |
| 163. |
If a noninverting amplifier has an RIN of 1000 ohms and an RFB of 2.5 kilohms, what is the RIN voltage when 1.42 mV is applied to the correct input? |
| A. | 3.5 mV |
| B. | ground |
| C. | 1.42 mV |
| D. | 0.56 mV |
| Answer» D. 0.56 mV | |
| 164. |
The input voltage must be ______ in the given circuit to obtain the given output voltage. |
| A. | 343 mV |
| B. | 400 mV |
| C. | 480 mV |
| D. | 600 mV |
| Answer» C. 480 mV | |
| 165. |
What is the cutoff frequency of this low-pass filter? |
| A. | 4.8 kHz |
| B. | 3.8 kHz |
| C. | 2.8 kHz |
| D. | 1.8 kHz |
| Answer» E. | |
| 166. |
In a PLL, to obtain lock, the signal frequency must: |
| A. | come within the lock range |
| B. | be less than the capture frequency |
| C. | come within the capture range |
| D. | be greater than the capture frequency |
| Answer» D. be greater than the capture frequency | |
| 167. |
Op-amps used as high- and low-pass filter circuits employ which configuration? |
| A. | noninverting |
| B. | comparator |
| C. | open-loop |
| D. | inverting |
| Answer» E. | |
| 168. |
A ______ is not a multivibrator. |
| A. | one-shot |
| B. | flip-flop |
| C. | VCO |
| D. | bistable |
| Answer» B. flip-flop | |
| 169. |
A noninverting closed-loop op-amp circuit generally has a gain factor: |
| A. | less than one |
| B. | greater than one |
| C. | of zero |
| D. | equal to one |
| Answer» C. of zero | |
| 170. |
What three subcircuits does a phase locked loop (PLL) consist of? |
| A. | phase comparator, comparator, and VCO |
| B. | phase comparator, bandpass filter, and VCO |
| C. | phase comparator, bandpass filter, and demodulator |
| D. | phase comparator, low-pass filter, and VCO |
| Answer» E. | |
| 171. |
Current actually flows into or out of a virtual ground. |
| A. | 1 |
| B. | |
| C. | 1 |
| D. | |
| Answer» C. 1 | |
| 172. |
What value of input resistance is needed in the given circuit to produce the given output voltage? |
| A. | 50 |
| B. | 4 k |
| C. | 4.08 k |
| D. | 5 k |
| Answer» C. 4.08 k | |
| 173. |
If the gain of a closed-loop inverting amplifier is 3.9, with an input resistor value of 1.6 kilohms, what value of feedback resistor is necessary? |
| A. | 6240 ohms |
| B. | 2.4 kilohms |
| C. | 410 ohms |
| D. | 0.62 kilohms |
| Answer» B. 2.4 kilohms | |
| 174. |
An op-amp circuit in which the output voltage is equal to the difference between the two input voltages is called a(n) _____ |
| A. | integrator |
| B. | differentiator |
| C. | differential amplifier |
| D. | voltage regulator |
| Answer» D. voltage regulator | |
| 175. |
This circuit is a voltage follower. |
| A. | 1 |
| B. | |
| Answer» C. | |
| 176. |
An output that is proportional to the addition of two or more inputs is from which type of amplifier? |
| A. | differentiator |
| B. | difference |
| C. | summing |
| D. | analog subtractor |
| Answer» D. analog subtractor | |
| 177. |
The ratio between differential gain and common-mode gain is called: |
| A. | amplitude |
| B. | differential-mode rejection |
| C. | common-mode rejection |
| D. | phase |
| Answer» D. phase | |
| 178. |
A circuit that uses an amplifier with passive filter elements is called a(n): |
| A. | relaxation oscillator |
| B. | signal generator |
| C. | differential amplifier |
| D. | active filter |
| Answer» E. | |
| 179. |
All of the following are basic op-amp input modes of operation EXCEPT |
| A. | inverting mode |
| B. | common-mode |
| C. | double-ended |
| D. | single-ended |
| Answer» B. common-mode | |
| 180. |
The common-mode voltage gain is |
| A. | smaller than differential voltage gain |
| B. | equal to voltage gain |
| C. | greater than differential voltage gain |
| D. | None of the above |
| Answer» B. equal to voltage gain | |
| 181. |
A PLL can be used as a(n) ___________. |
| A. | series voltage regulator |
| B. | frequency multiplier |
| C. | relaxation oscillator |
| D. | Schmitt trigger |
| Answer» C. relaxation oscillator | |
| 182. |
Another name for a unity gain amplifier is: |
| A. | difference amplifier |
| B. | comparator |
| C. | single ended |
| D. | voltage follower |
| Answer» E. | |
| 183. |
The open-loop voltage gain (Aol) of an op-amp is the |
| A. | external voltage gain the device is capable of |
| B. | internal voltage gain the device is capable of |
| C. | most controlled parameter |
| D. | same as Acl |
| Answer» C. most controlled parameter | |
| 184. |
How many leads does the TO-5 metal can package of an operational amplifier have? |
| A. | 8, 10, or 12 |
| B. | 6, 8, or 10 |
| C. | 8 or 14 |
| D. | 8 or 16 |
| Answer» B. 6, 8, or 10 | |
| 185. |
If an op-amp has one input grounded and the other input has a signal feed to it, then it is operating as what? |
| A. | Common-mode |
| B. | Single-ended |
| C. | Double-ended |
| D. | Noninverting mode |
| Answer» C. Double-ended | |
| 186. |
A differential amplifier has a common-mode gain of 0.2 and a common-mode rejection ratio of 3250. What would the output voltage be if the single-ended input voltage was 7 mV rms? |
| A. | 1.4 mV rms |
| B. | 650 mV rms |
| C. | 4.55 V rms |
| D. | 0.455 V rms |
| Answer» D. 0.455 V rms | |
| 187. |
If ground is applied to the (+) terminal of an inverting op-amp, the (–) terminal will: |
| A. | not need an input resistor |
| B. | be virtual ground |
| C. | have high reverse current |
| D. | not invert the signal |
| Answer» C. have high reverse current | |
| 188. |
Feedback is used in an open-loop operational amplifier circuit. |
| A. | 1 |
| B. | |
| C. | 1 |
| D. | |
| Answer» C. 1 | |
| 189. |
What is the output waveform? |
| A. | sine wave |
| B. | square wave |
| C. | sawtooth wave |
| D. | triangle wave |
| Answer» E. | |
| 190. |
In an open-loop op-amp circuit, whenever the inverting input (–) is negative relative to the noninverting input (+), the output will: |
| A. | swing negative |
| B. | close the loop |
| C. | be balanced |
| D. | swing positive |
| Answer» E. | |
| 191. |
A series dissipative regulator is an example of a: |
| A. | linear regulator |
| B. | switching regulator |
| C. | shunt regulator |
| D. | dc-to-dc converter |
| Answer» B. switching regulator | |
| 192. |
What is this circuit? |
| A. | a low-pass filter |
| B. | a high-pass filter |
| C. | a bandpass filter |
| D. | a band-stop filter |
| Answer» E. | |
| 193. |
The voltage follower has a: |
| A. | closed-loop voltage gain of unity |
| B. | small open-loop voltage gain |
| C. | closed-loop bandwidth of zero |
| D. | large closed-loop output impedance |
| Answer» B. small open-loop voltage gain | |
| 194. |
An ideal operational amplifier has |
| A. | infinite output impedance |
| B. | zero input impedance |
| C. | infinite bandwidth |
| D. | All of the above |
| Answer» D. All of the above | |