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MCQOPTIONS
This section includes 1475 Mcqs, each offering curated multiple-choice questions to sharpen your Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 351. |
Refer to this figure. Find the tunnel diode symbol. |
| A. | a |
| B. | b |
| C. | c |
| D. | d |
| E. | e |
| Answer» E. e | |
| 352. |
Refer to this figure. If the load current increases, IR will ________ and IZ will ________. |
| A. | remain the same, increase |
| B. | decrease, remain the same |
| C. | increase, remain the same |
| D. | remain the same, decrease |
| Answer» E. | |
| 353. |
LEDs are made out of |
| A. | silicon. |
| B. | germanium. |
| C. | gallium. |
| D. | silicon and germanium, but not gallium. |
| Answer» D. silicon and germanium, but not gallium. | |
| 354. |
The normal operating region for a zener diode is the |
| A. | forward-bias region. |
| B. | reverse-bias region. |
| C. | zero-crossing region. |
| D. | reverse-breakdown region. |
| Answer» E. | |
| 355. |
Refer to the given figure. If the output of the circuit were to be a short circuit, what power rating would R1 need to have? |
| A. | 2.25 W |
| B. | 5 W |
| C. | 10 W |
| D. | 22.5 W |
| Answer» E. | |
| 356. |
A switching regulator that is configured as a voltage-inverter produces what type of output? |
| A. | an ac output with opposite phase to the input ac |
| B. | a dc output that is the negative of the dc input voltage |
| C. | an output that is a higher voltage than the input voltage |
| D. | an ac output from a dc input voltage |
| Answer» C. an output that is a higher voltage than the input voltage | |
| 357. |
Refer to the given figure. This circuit is called |
| A. | a series-pass voltage regulator. |
| B. | a shunt voltage regulator. |
| C. | a step-up switching regulator. |
| D. | a step-down switching regulator. |
| Answer» E. | |
| 358. |
In Figure 17-1(a)(see question 6), the purpose of R1 is to |
| A. | provide a reference voltage. |
| B. | limit current through the diode. |
| C. | limit voltage to the op-amp. |
| D. | provide output voltage sampling. |
| Answer» C. limit voltage to the op-amp. | |
| 359. |
For a full-wave rectifier with ac ripple at 120 Hz, the impedance of a capacitor can be calculated using XC = ________. |
| A. | 0.707 C |
| B. | 1.414 C |
| C. | 1.3 C |
| D. | 0.785 C |
| Answer» D. 0.785 C | |
| 360. |
What is the purpose of an additional RC filter section in a power supply circuit? |
| A. | Increase the dc voltage component |
| B. | Increase the ac voltage component |
| C. | Decrease the ac voltage component |
| D. | None of the above |
| Answer» D. None of the above | |
| 361. |
What is the ratio of the period of the output voltage to the period of the input voltage in a full-wave rectifier? |
| A. | 0 |
| B. | 0.5 |
| C. | 1 |
| D. | 2 |
| Answer» C. 1 | |
| 362. |
If the value of full-load voltage is the same as the no-load voltage, the voltage regulation calculated is ________ %, which is the best expected. |
| A. | 0 |
| B. | 1 |
| C. | 99 |
| D. | 100 |
| Answer» B. 1 | |
| 363. |
Calculate the ripple of a filter output having a 20-V dc component and a 1.7 Vr(rms) ac component. |
| A. | 6% |
| B. | 8.5% |
| C. | 85% |
| D. | 58% |
| Answer» C. 85% | |
| 364. |
A voltage regulator has a no-load output of 18 V and a full-load output of 17.3 V. The percent load regulation is |
| A. | 0.25%. |
| B. | 96.1%. |
| C. | 4.05%. |
| D. | 1.04%. |
| Answer» D. 1.04%. | |
| 365. |
Refer to the given figure. This circuit is known as |
| A. | a series-pass voltage regulator. |
| B. | a shunt voltage regulator. |
| C. | a step-up switching regulator. |
| D. | a step-down switching regulator. |
| Answer» C. a step-up switching regulator. | |
| 366. |
Calculate the voltage regulation of a power supply having VNL = 50 V and VFL = 48 V. |
| A. | 4.17% |
| B. | 5.2% |
| C. | 6.2% |
| D. | 7.1% |
| Answer» B. 5.2% | |
| 367. |
Clipping is the result of |
| A. | the input signal being too large. |
| B. | the transistor being driven into saturation. |
| C. | the transistor being driven into cutoff. |
| D. | all of the above |
| Answer» E. | |
| 368. |
Which transistor bias circuit arrangement provides good stability using negative feedback from collector to base? |
| A. | base bias |
| B. | collector-feedback bias |
| C. | voltage-divider bias |
| D. | emitter bias |
| Answer» C. voltage-divider bias | |
| 369. |
Schottky diodes are also known as |
| A. | PIN diodes. |
| B. | hot carrier diodes. |
| C. | step-recovery diodes. |
| D. | tunnel diodes. |
| Answer» C. step-recovery diodes. | |
| 370. |
The Schottky diode is used |
| A. | in high-power circuits. |
| B. | in circuits requiring negative resistance. |
| C. | in very fast-switching circuits. |
| D. | in power supply rectifiers. |
| Answer» D. in power supply rectifiers. | |
| 371. |
You have an application for a diode to be used in a tuning circuit. A type of diode to use might be |
| A. | an LED. |
| B. | a Schottky diode. |
| C. | a Gunn diode. |
| D. | a varactor. |
| Answer» E. | |
| 372. |
Which of the following is not a linear/digital IC? |
| A. | Phase-locked loop |
| B. | Voltage-controlled oscillator |
| C. | Passive filter |
| D. | Comparator |
| Answer» D. Comparator | |
| 373. |
A 339 IC is an example of a fourteen-pin DIP that can be made to function as a ________. |
| A. | comparator |
| B. | 555 timer |
| C. | D to A converter |
| D. | ladder network |
| Answer» B. 555 timer | |
| 374. |
What is (are) general-purpose/small-signal transistors case type(s)? |
| A. | TO-18 |
| B. | TO-92 |
| C. | TO-39 |
| D. | TO-52 |
| E. | all of the above |
| Answer» F. | |
| 375. |
What is the order of doping, from heavily to lightly doped, for each region? |
| A. | base, collector, emitter |
| B. | emitter, collector, base |
| C. | emitter, base, collector |
| D. | collector, emitter, base |
| Answer» C. emitter, base, collector | |
| 376. |
Refer to this figure. The value of VBC is: |
| A. | 9.2 V |
| B. | 9.9 V |
| C. | 9.9 V |
| D. | 9.2 V |
| Answer» E. | |
| 377. |
What is (are) common fault(s) in a BJT-based circuit? |
| A. | opens or shorts internal to the transistor |
| B. | open bias resistor(s) |
| C. | external opens and shorts on the circuit board |
| D. | all of the above |
| Answer» E. | |
| 378. |
The dc load line on a family of collector characteristic curves of a transistor shows the |
| A. | saturation region. |
| B. | cutoff region. |
| C. | active region. |
| D. | all of the above |
| Answer» E. | |
| 379. |
Refer to this figure. Determine the minimum value of VIN from the following that will saturate this transistor. |
| A. | 13.21 V |
| B. | 12.51 V |
| C. | 0.7 V |
| D. | 9.4 V |
| Answer» B. 12.51 V | |
| 380. |
The magnitude of dark current in a phototransistor usually falls in what range? |
| A. | mA |
| B. | A |
| C. | nA |
| D. | pA |
| Answer» D. pA | |
| 381. |
A 35 mV signal is applied to the base of a properly biased transistor with an r'e = 8 and RC = 1 k. The output signal voltage at the collector is: |
| A. | 3.5 V |
| B. | 28.57 V |
| C. | 4.375 mV |
| D. | 4.375 V |
| Answer» E. | |
| 382. |
Refer to this figure. The value of VCE is: |
| A. | 9.9 V |
| B. | 9.2 V |
| C. | 0.7 V |
| D. | 19.3 V |
| Answer» B. 9.2 V | |
| 383. |
nMOS and pMOS transistors can be used for class B. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 384. |
Determine VB1. |
| A. | 0 V |
| B. | 0.7 V |
| C. | 9.3 V |
| D. | 10.7 V |
| Answer» E. | |
| 385. |
A class A amplifier with RC = 3.3 k and RE = 1.2 k has a VCC = 20 V. Find IC(sat). |
| A. | 4.4 mA |
| B. | 6.1 mA |
| C. | 16.7 mA |
| D. | 20 mA |
| Answer» B. 6.1 mA | |
| 386. |
In practice, the efficiency of a capacitively coupled class A amplifier is about ________%. |
| A. | 25 |
| B. | 40 |
| C. | 70 |
| D. | 10 |
| Answer» E. | |
| 387. |
Which of the following describe(s) a power amplifier? |
| A. | It can handle large power. |
| B. | It can handle large current. |
| C. | It does not provide much voltage gain. |
| D. | All of the above |
| Answer» E. | |
| 388. |
Categorize the power efficiency of each class of amplifier, from worst to best. |
| A. | A, B, AB, D |
| B. | A, AB, D, B |
| C. | A, AB, B, D |
| Answer» D. | |
| 389. |
Which of the push-pull amplifiers is presently the most popular form of the class B power amplifier? |
| A. | Quasi-complementary |
| B. | Transformer-coupled |
| C. | Complementary-symmetry |
| D. | None of the above |
| Answer» B. Transformer-coupled | |
| 390. |
What is the maximum efficiency of a class B circuit? |
| A. | 90% |
| B. | 78.5% |
| C. | 50% |
| D. | 25% |
| Answer» C. 50% | |
| 391. |
The maximum efficiency of a class B amplifier is ________ percent. |
| A. | 50 |
| B. | 25 |
| C. | 70 |
| D. | 79 |
| Answer» E. | |
| 392. |
The maximum efficiency of a transformer-coupled class A amplifier is ________. |
| A. | 25% |
| B. | 50% |
| C. | 78.5% |
| D. | 63.6% |
| Answer» C. 78.5% | |
| 393. |
A class ________ amplifier is biased slightly above cutoff and operates in the linear region for slightly more than 180 of the input cycle. |
| A. | A |
| B. | B |
| C. | C |
| D. | AB |
| Answer» E. | |
| 394. |
The class ________ amplifier is biased below cutoff. |
| A. | A |
| B. | AB |
| C. | B |
| D. | C |
| Answer» E. | |
| 395. |
Which of the following is (are) the disadvantage(s) of a class B complementary-symmetry circuit? |
| A. | It needs two separate voltage sources. |
| B. | There is crossover distortion in the output signal. |
| C. | It does not provide exact switching of one transistor off and the other on at the zero-voltage condition. |
| D. | All of the above |
| Answer» E. | |
| 396. |
Which of the power amplifiers has the lowest overall efficiency? |
| A. | Class A |
| B. | Class B or AB |
| C. | Class C |
| D. | Class D |
| Answer» B. Class B or AB | |
| 397. |
Calculate the efficiency of a class B amplifier for a supply voltage of VCC = 20 V with peak output voltage of VL(p) = 18 V. Assume RL = 16. |
| A. | 78.54% |
| B. | 75% |
| C. | 70.69% |
| D. | 50% |
| Answer» D. 50% | |
| 398. |
This is an example of the output swing for a class ________ amplifier. |
| A. | A |
| B. | B |
| C. | AB |
| D. | C |
| E. | D |
| Answer» B. B | |
| 399. |
For BJT power transistors, the collector terminal is always connected to the transistor's case |
| A. | for easy circuit connection. |
| B. | to prevent shorts. |
| C. | because the collector terminal is the critical terminal for heat dissipation. |
| D. | because the collector terminal is located nearest the case. |
| Answer» D. because the collector terminal is located nearest the case. | |
| 400. |
Refer to this figure. The approximate voltages on the base, collector, and emitter, respectively, are |
| A. | 0.7 V, 6.8 V, 0 V. |
| B. | 0 V, 0 V, 0 V. |
| C. | 0.7 V, 15 V, 0 V. |
| D. | 0.7 V, 0 V, 15 V. |
| Answer» D. 0.7 V, 0 V, 15 V. | |