MCQOPTIONS
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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.
| 401. |
Calculate the harmonic distortion component for an output signal having a fundamental amplitude of 3 V and a second harmonic amplitude of 0.25 V. |
| A. | 3.83% |
| B. | 38.3% |
| C. | 83.3% |
| D. | 8.33% |
| Answer» E. | |
| 402. |
Which amplifier is commonly used as a frequency multiplier? |
| A. | class A |
| B. | class B |
| C. | class C |
| D. | all of the above |
| Answer» D. all of the above | |
| 403. |
Determine what maximum dissipation will be allowed for a 70-W silicon transistor (rated at 25 C) if derating is required above 25 C by a derating factor of 0.6 W/ C at a case temperature of 100 . |
| A. | 25 W |
| B. | 30 W |
| C. | 35 W |
| D. | 40 W |
| Answer» B. 30 W | |
| 404. |
What is the maximum temperature rating for silicon power transistors? |
| A. | 50 to 80 |
| B. | 100 to 110 |
| C. | 150 to 200 |
| D. | 250 to 300 |
| Answer» D. 250 to 300 | |
| 405. |
Which type of power amplifier is biased for operation at less than 180 of the cycle? |
| A. | Class A |
| B. | Class B or AB |
| C. | Class C |
| D. | Class D |
| Answer» D. Class D | |
| 406. |
Class AB operation is ________ operation. |
| A. | similar to class A |
| B. | similar to class B |
| C. | similar to class C |
| D. | None of the above |
| Answer» E. | |
| 407. |
Quiescent power is the power dissipation of a transistor |
| A. | with no signal input. |
| B. | with no load. |
| C. | under full load. |
| D. | along the dc load line. |
| Answer» B. with no load. | |
| 408. |
Which of the power amplifiers is not intended primarily for large-signal or power amplification? |
| A. | Class A |
| B. | Class B or AB |
| C. | Class C |
| D. | Class D |
| Answer» D. Class D | |
| 409. |
Refer to this figure. This amplifier is operating as a ________ amplifier. |
| A. | class A |
| B. | class B |
| C. | class AB |
| D. | class C |
| Answer» D. class C | |
| 410. |
By how much does the output signal vary for a class AB power amplifier? |
| A. | 360 |
| B. | 180 |
| C. | Between 180 and 360 |
| D. | Less than 180 |
| Answer» D. Less than 180 | |
| 411. |
How many transistors must be used in a class B power amplifier to obtain the output for the full cycle of the signal? |
| A. | 0 |
| B. | 1 |
| C. | 2 |
| D. | 3 |
| Answer» D. 3 | |
| 412. |
What transformer turns ratio is required to match an 8- speaker load so that the effective load resistance seen at the primary is 12.8 k? |
| A. | 20:1 |
| B. | 40:1 |
| C. | 50:1 |
| D. | 60:1 |
| Answer» C. 50:1 | |
| 413. |
Which of the following is (are) power amplifiers? |
| A. | Class A |
| B. | Class B or AB |
| C. | Class C or D |
| D. | All of the above |
| Answer» E. | |
| 414. |
Refer to the figure. The maximum efficiency of this amplifier is |
| A. | about 25%. |
| B. | about 78%. |
| C. | about 70%. |
| D. | about 100%. |
| Answer» C. about 70%. | |
| 415. |
What is the maximum efficiency of a class A circuit with a direct or series-fed load connection? |
| A. | 90% |
| B. | 78.5% |
| C. | 50% |
| D. | 25% |
| Answer» E. | |
| 416. |
Which class of amplifier operates in the linear region for only a small part of the input cycle? |
| A. | A |
| B. | B |
| C. | C |
| D. | AB |
| Answer» D. AB | |
| 417. |
When is the counter set to zero in the dual-slope method of conversion? |
| A. | Prior to the charging of the capacitor of the integrator |
| B. | While the capacitor is being charged |
| C. | At the end of the charging of the capacitor |
| D. | During the discharging of the capacitor |
| Answer» D. During the discharging of the capacitor | |
| 418. |
The 555 timer IC is made up of a combination of linear comparators and digital flip-flops. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 419. |
A 311 IC is an example of an eight-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 | |
| 420. |
Determine the free-running frequency when R3 is set to 2.5 k. |
| A. | 19.7 kHz |
| B. | 32.5 kHz |
| C. | 116.39 kHz |
| D. | 212.9 kHz |
| Answer» D. 212.9 kHz | |
| 421. |
What is the maximum conversion time of a clock rate of 1 MHz operating a 10-stage counter in an ADC? |
| A. | 1.024 s |
| B. | 102.3 ms |
| C. | 10.24 ms |
| D. | 1.024 ms |
| Answer» E. | |
| 422. |
Which of the following best describes the output of a 566 voltage-controlled oscillator? |
| A. | Square-wave |
| B. | Triangular-wave |
| C. | Both square- and triangular-wave |
| D. | None of the above |
| Answer» D. None of the above | |
| 423. |
The timing components for a PLL are 15 k and 220 pF. Calculate the free-running frequency. |
| A. | 90.91 kHz |
| B. | 136.36 kHz |
| C. | 156.1 kHz |
| D. | 181.8 kHz |
| Answer» B. 136.36 kHz | |
| 424. |
Which of the following frequencies is associated with the 565 frequency-shift keyed decoder? |
| A. | 1070 Hz |
| B. | 1270 Hz |
| C. | Both 1070 Hz and 1270 Hz |
| D. | None of the above |
| Answer» D. None of the above | |
| 425. |
This circuit is an example of a ________. |
| A. | comparator |
| B. | 555 timer |
| C. | D to A converter |
| D. | ladder network |
| Answer» B. 555 timer | |
| 426. |
Which of the following devices is (are) a component of a digital-to-analog converter (DAC)? |
| A. | Integrator |
| B. | Comparator |
| C. | Digital counter |
| D. | All of the above |
| Answer» E. | |
| 427. |
Which of the following circuits is (are) linear/digital ICs? |
| A. | Comparators |
| B. | Timers |
| C. | Voltage-controlled oscillators |
| D. | All of the above |
| Answer» E. | |
| 428. |
How many Vcc connections does the 565 PLL use? |
| A. | 0 |
| B. | 1 |
| C. | 2 |
| D. | 3 |
| Answer» D. 3 | |
| 429. |
What is (are) the input(s) to the comparator in the ladder-network conversion of an ADC? |
| A. | Staircase voltage |
| B. | Analog input voltage |
| C. | Both staircase and analog input voltage |
| D. | None of the above |
| Answer» D. None of the above | |
| 430. |
This circuit is an example of a ________. |
| A. | comparator |
| B. | 555 timer |
| C. | D to A converter |
| D. | ladder network |
| Answer» E. | |
| 431. |
How many comparators does a 339 IC contain? |
| A. | 4 |
| B. | 3 |
| C. | 2 |
| D. | 1 |
| Answer» B. 3 | |
| 432. |
Determine the free-running frequency for this circuit. |
| A. | 32.5 kHz |
| B. | 53.33 kHz |
| C. | 533.3 kHz |
| D. | 5.3 MHz |
| Answer» C. 533.3 kHz | |
| 433. |
Which application best describes this 555 timer circuit? |
| A. | Monostable multivibrator |
| B. | Astable multivibrator |
| C. | Bistable multivibrator |
| D. | One-shot multivibrator |
| Answer» C. Bistable multivibrator | |
| 434. |
At which of the following period(s) is the counter advanced (incremented) in dual-slope conversion? |
| A. | During the charging of the capacitor of the integrator |
| B. | During the discharging of the capacitor of the integrator |
| C. | During both the charging and discharging of the capacitor of the integrator |
| D. | None of the above |
| Answer» C. During both the charging and discharging of the capacitor of the integrator | |
| 435. |
This figure is a block diagram of a(n) ________. |
| A. | ADC |
| B. | DAC |
| C. | comparator |
| D. | 555 timer |
| Answer» B. DAC | |
| 436. |
Which of the slope intervals of the integrator does the counter in the analog-to-digital converter (ADC) operate? |
| A. | Positive |
| B. | Negative |
| C. | Both positive and negative |
| D. | Neither positive nor negative |
| Answer» D. Neither positive nor negative | |
| 437. |
On which of the following does the conversion depend in ladder-network conversion? |
| A. | Comparator |
| B. | Control logic |
| C. | Digital counter |
| D. | Clock |
| Answer» B. Control logic | |
| 438. |
The voltage-controlled oscillator is a subset of the "test bench" function generator. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 439. |
Which application best describes this 555 timer circuit? |
| A. | Monostable multivibrator |
| B. | Astable multivibrator |
| C. | Bistable multivibrator |
| D. | Free-running multivibrator |
| Answer» B. Astable multivibrator | |
| 440. |
Calculate the frequency of this circuit. |
| A. | 635 Hz |
| B. | 450 Hz |
| C. | 228 Hz |
| D. | 128 Hz |
| Answer» E. | |
| 441. |
The Q-point is at cutoff for class ________ operation. |
| A. | A |
| B. | B |
| C. | C |
| D. | AB |
| Answer» C. C | |
| 442. |
The principal advantage(s) of MOSFETs over BJTs is (are) |
| A. | their biasing networks are simpler. |
| B. | their drive requirements are simpler. |
| C. | they can be connected in parallel for added drive capability. |
| D. | all of the above |
| Answer» E. | |
| 443. |
Which of the following instruments allows more precise measurement of the harmonic components of a distorted signal? |
| A. | Digital multimeter |
| B. | Spectrum analyzer |
| C. | Oscilloscope |
| D. | Wave analyzer |
| Answer» E. | |
| 444. |
In class B operation, at what fraction of VCC should the level of VL(p) be to achieve the maximum power dissipated by the output transistor? |
| A. | 0.5 |
| B. | 0.636 |
| C. | 0.707 |
| D. | 1 |
| Answer» C. 0.707 | |
| 445. |
Class ________ amplifiers are normally operated in a push-pull configuration in order to produce an output that is a replica of the input. |
| A. | A |
| B. | B |
| C. | C |
| D. | AB |
| Answer» E. | |
| 446. |
Which type of amplifier uses pulse (digital) signals in its operation? |
| A. | Class A |
| B. | Class B or AB |
| C. | Class C |
| D. | Class D |
| Answer» E. | |
| 447. |
A class A amplifier has a voltage gain of 30 and a current gain of 25. What is the power gain? |
| A. | 30 |
| B. | 25 |
| C. | 1.2 |
| D. | 750 |
| Answer» E. | |
| 448. |
Which of the following transistors has been quite popular as the driver device for class D amplification? |
| A. | BJT |
| B. | FET |
| C. | UJT |
| D. | MOSFET |
| Answer» E. | |
| 449. |
In a class AB amplifier, if the VBE drops are not matched to the diode drops or if the diodes are not in thermal equilibrium with the transistors, this can result in |
| A. | a current mirror. |
| B. | diode separation. |
| C. | crossover distortion. |
| D. | thermal runaway. |
| Answer» E. | |
| 450. |
The least efficient amplifier among all classes is |
| A. | class B. |
| B. | class A. |
| C. | class AB. |
| D. | class C. |
| Answer» C. class AB. | |