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# MCQ in Electronic Circuits Part 6 | ECE Board Exam

This is the Multiple Choice Questions in Electronic Circuits (Electronic Devices and Circuits, Electronic Circuit Analysis and Design) Part 6 of the Series as one of the Electronics Engineering Examination topic. In Preparation for the ECE Board Exam make sure to expose yourself and familiarize in each and every questions compiled here taken from various sources including but not limited to past Board Exam Questions in Electronics Engineering field, Electronics Books, Journals and other Electronics References.

#### MCQ Topic Outline included in ECE Board Exam Syllabi

4. Electronic Devices and Circuits

• MCQ in Diode Wave Shaping Circuits and Special Diode Applications
• MCQ in BJT and FET Small Signal Analysis
• MCQ in Diode Equivalent Circuits
• MCQ in Voltage Multipliers, Power Supply, and Voltage Regulation
• MCQ in Bipolar Junction Transistor and FET

5. Electronic Circuit Analysis and Design

• MCQ in BJT and FET Frequency Response
• MCQ in Cascade and Cascode Connections
• MCQ in Current Mirrors and Current Source
• MCQ in Differential and Operational Amplifier
• MCQ in Feedback Systems, Oscillators, and Filters

#### Continue Practice Exam Test Questions Part 6 of the Series

Choose the letter of the best answer in each questions.

251. What do you call an amplifier which has an output current flowing during the whole input current cycle?

A. class AB amplifier

B. class B amplifier

C. class A amplifier

D. class C amplifier

Solution:

252. Class A amplifier can be built from what transistor configuration?

A. common base

B. common emitter

C. common collector

D. all of the above

Solution:

253. If a transistor amplifier provides a 360ยฐ output signal, it is classified as

A. class A

B. class B

C. class C

D. class D

Solution:

254. An amplifier that delivers an output signal of 180ยฐ only.

A. class A

B. class B

C. class AB

D. class D

Solution:

255. A class of amplifiers wherein the output signal swings more than 180ยฐ but less than 360ยฐ.

A. class A

B. class B

C. class C

D. class AB

Solution:

256. What is the distinguishing feature of a class C amplifier?

A. Output is present for less than 180 degrees of the input signal cycle

B. Output is present for the entire signal cycle

C. Output is present for exactly 180 degrees of the input signal cycle

D. Output is present for more than 180 degrees but less than 60 degrees of the input signal cycle

Solution:

257. A full 360ยฐ sine-wave signal is applied as an input to an unknown class of amplifier, if the output delivers only a pulse of less than 180ยฐ, of what class does this amplifier belongs?

A. class AB

B. class B

C. class C

D. class D

Solution:

258. Which class of amplifiers that is intended for pulse operation?

A. class B

B. class C

C. class D

D. class S

Solution:

259. How do you classify an amplifier used to amplify either amplitude modulated (AM) or frequency modulated (FM) signals?

A. class C

B. class BC

C. class D

D. class S

Solution:

260. Which class of amplifiers that has the highest efficiency?

A. class A

B. class B

C. class C

D. class D

Solution:

261. What is the efficiency of a series-fed class A amplifier?

A. 25%

B. 50%

C. 78.5%

D. above 90%

Solution:

262. A class A amplifier has an efficiency of only 25%, but this can be increased if the output is coupled with a transformer. Up to how much is its efficiency will reach due to coupling?

A. 36.5%

B. 50%

C. 68.5%

D. 78.5%

Solution:

263. Class B amplifiers deliver an output signal of 180ยฐ and have a maximum efficiency of

A. 50%

B. 68.5%

C. 78.55

D. above 90%

Solution:

264. Transistorized class C power amplifiers will usually have an efficiency of

A. 25%

B. 33%

C. 50%

D. 78.5%

Solution:

265. For pulse-amplification, class D amplifier is mostly used. How efficient is a class D amplifier?

B. less efficient than class B

C. more efficient than class A but less efficient than class B

D. its efficiency reaches over 90%

Solution:

266. An amplifier of class AB means its output signal is between the output of class B and A, such that it varies from 180ยฐ (class B) to 360ยฐ (class A). How about its efficiency?

A. Efficiency of class AB is in between the efficiency of class A and B, that is from 25% – 78.5%.

B. It is always as efficient as class A (25%).

C. It is always as efficient as class B (78.5%)

D. The efficiency of class AB is the average of the efficiencies of both class A and class B (25% + 78.5%)/2 = 51.75%

Solution:

267. Among the given amplifiers below, which is the most efficient?

A. class A (series-fed)

B. class A (transformer-coupled)

C. class A (directly-coupled)

D. class A (capacitor-coupled)

Solution:

268. In order to have the best efficiency and stability, where at the loadline should a solid state power amplifier be operated?

A. Just below the saturation point

B. At 1.414 times the saturation point

C. Just above the saturation point

D. At the saturation point

Solution:

269. In most transistor class A amplifiers, the quiescent point is set at

A. near saturation

B. near cutoff

C. below cutoff

D. at the center

Solution:

270. For a class B amplifier, the operating point or Q-point is set at

A. the top of the load line

B. saturation

C. the center

D. cutoff

Solution:

271. The Q-point for class A amplifier is at the active region, while for class B it is at cutoff region, how about for class AB?

A. it is slightly below saturation

B. it is slightly above cutoff

C. it is slightly above saturation

D. it is at the saturation region

Solution:

272. Where does the Q-point of a class C amplifier positioned?

A. at saturation region

B. at active region

C. at cutoff region

D. below cutoff region

Solution:

273. The Q-point of a class D amplifier can be set or positioned at what region in the load line?

A. below saturation

B. above cutoff

C. at cutoff

D. any of the above

Solution:

274. Which of the amplifiers given below that is considered as non-linear?

A. class A

B. class B

C. class AB

D. class C

Solution:

275. Which amplifiers can be used for linear amplification?

A. class A

B. class B

C. class C

D. class A or B

Solution:

276. What do you call an amplifier that is biased to class C but modulates over the same portion of the curve as if it were biased to class B?

A. class S

B. class D

C. class AB

D. class BC

Solution:

277. Two class B amplifiers connected such that one amplifies the positive cycle and the other amplifies the remaining negative cycle. Both output signals are then coupled by a transformer to the load.

A. transformer-coupled push โpull amplifier

B. complementary-symmetry amplifier

C. quasi-complementary push-pull amplifier

D. transformer-coupled class A amplifier

Solution:

278. A push-pull amplifier that uses npn and pnp transistors to amplify the positive and negative cycles respectively.

A. transformer-coupled push โpull amplifier

B. complementary-symmetry amplifier

C. quasi-complementary push-pull amplifier

D. transformer-coupled class A amplifier

Solution:

279. A push-pull amplifier that uses either npn or pnp as its final stage. The circuit configuration looks like the complementary-symmetry.

A. transformer-coupled push โpull amplifier

B. complementary-symmetry amplifier

C. quasi-complementary push-pull amplifier

D. feed-back pair amplifier

Solution:

280. Amplifiers conversion efficiency are calculated using what formula?

A. ac-power/dc-power

B. ac-power/dissipated power

C. dc-power/ac-power

D. A or B are correct

Solution:

281. Basically, which class of amplifiers has the least distortion?

A. class A

B. class B

C. class C

D. class D

Solution:

282. A type of distortion wherein the output signal does not have the desired linear relation to the input.

A. linear distortion

B. nonlinear distortion

C. cross-over distortion

D. all of the above

Solution:

283. Distortion that is due to the inability of an amplifier to amplify equally well all the frequencies present at the input signal.

A. nonlinear distortion

B. amplitude distortion

C. harmonic distortion

D. cross-over distortion

Solution:

284. A nonlinear distortion in which the output consists of undesired harmonic frequencies of the input signal.

A. amplitude distortion

B. frequency distortion

C. cross-over distortion

D. harmonic distortion

Solution:

285. Calculate the 2nd harmonic distortion for an output signal having a fundamental amplitude of 3 V and a 2nd harmonic amplitude of 0.3 V.

A. 1.0%

B. 10%

C. 23.33%

D. 43.33%

286. An amplifier has the following percent harmonic distortions; D2 = 10%, D3 = 5% and D4 = 1%. What is the amplifier % THD?

A. 5.33%

B. 11.22%

C. 16.0%

D. 22.11%

Solution:

Solution: What is the amplifier % THD?

287. Which of the following refers to the gain of a circuit?

A. Input quantity of an amplifier divided by the output quantity.

B. The difference between the input voltage and the output voltage of a circuit.

C. The ratio of the output quantity to input quantity of an amplifier.

D. The total increase in output quality over the input quantity of an amplifier.

Solution:

288. The overall gain of an amplifier in cascade is

A. the sum

B. the average of each

C. the product

D. 100% the sum

Solution:

289. If three amplifiers with a gain of 8 each are in cascade, how much is the overall gain?

A. 72

B. 24

C. 512

D. 8

Solution:

Solution: How much is the overall gain?

290. A multistage transistor amplifier arranged in a conventional series manner, the output of one stage is forward-coupled to the next stage.

B. cascoded amplifier

C. darlington configuration

D. feed-back pair configuration

Solution:

291. A direct-coupled two-stage transistor configuration wherein the output of the first transistor is directly coupled and amplified by the second transistor. This configuration gives a very high current gain.

B. cascode configuration

C. darlington configuration

D. feed-back pair

Solution:

292. A two-stage transistor amplifier in which the output collector of the first stage provides input to the emitter of the second stage. The final output is then taken from the collector

of the second stage.

B. cascode configuration

C. quasi-complementary

D. complementary amplifier

Solution:

293. Famous transistor amplifier configuration designed to eliminate the so called Miller effect.

A. cascode amplifier

B. darlington amplifier

C. differential amplifier

D. complementary-symmetry

Solution:

294. What are the transistor configurations used in a cascade amplifier?

A. common-base and common-emitter

B. common-base and common-collector

C. common-collector and common-emitter

D. common-emitter and common-base

Solution:

295. Transistor configuration known to have a super-beta (ฮฒ2).

B. cascode

C. darlington

D. differential

Solution:

296. What is the approximate threshold voltage between the base-emitter junction of a silicon darlington transistor?

A. 0.3 V

B. 0.6 V

C. 1.6 V

D. 3.0 V

Solution:

297. Transistor arrangement that operates like a darlington but uses a combination of pnp and npn transistors instead of both npn.

A. differential

B. common

C. cascode

D. feedback pair

Solution:

298. An amplifier basically constructed from two transistors and whose output is proportional to the difference between the voltages applied to its two inputs.

A. differential amplifier

B. cascode amplifier

C. complementary amplifier

D. quasi-complementary amplifier

Solution:

299. An amplifier having high direct-current stability and high immunity to oscillation, this is initially used to perform analog-computer functions such as summing and integrating.

A. operational amplifier (op-amp)

B. parametric amplifier (par-amp)

C. instrumentation amplifier

D. DC-amplifier

Solution:

300. One of the most versatile and widely used electronic device in linear applications.

A. SCR

B. FET

C. UJT

D. op-amp

Solution:

#### Questions and Answers in Electronic Circuits

Following is the list of practice exam test questions in this brand new series:

MCQ in Electronic Circuits
PART 1: MCQ from Number 1 โ 50                        Answer key: PART 1
PART 2: MCQ from Number 51 โ 100                   Answer key: PART 2
PART 3: MCQ from Number 101 โ 150                 Answer key: PART 3
PART 4: MCQ from Number 151 โ 200                 Answer key: PART 4
PART 5: MCQ from Number 201 โ 250                 Answer key: PART 5
PART 6: MCQ from Number 251 โ 300                 Answer key: included
PART 7: MCQ from Number 301 โ 350                 Answer key: included
PART 8: MCQ from Number 351 โ 400                 Answer key: included
PART 9: MCQ from Number 401 โ 450                 Answer key: included
PART 10: MCQ from Number 451 โ 500                 Answer key: included

### Complete List of MCQ in Electronics Engineering per topic

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