 # MCQ in Electronic Circuits Part 8 | ECE Board Exam

(Last Updated On: May 4, 2019) This is the Multiples Choice Questions Part 8 of the Series in Electronic (Audio/RF) Circuit, Analysis and Design as one of the Electronics Engineering 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

• MCQ in Amplifiers
• MCQ in Oscillators
• MCQ in Rectifier
• MCQ in Filters
• MCQ in Voltage Regulation

### Continue Practice Exam Test Questions Part 8 of the Series

Choose the letter of the best answer in each questions.

351. Op-amp parameter(s) that is important in large signal dc-amplification.

A. input offset voltage

B. input offset current

C. slew rate

D. all of the above

Solution:

352. In large signal dc-amplifiers using op-amp, which parameter has the least effect on its performance?

A. drift

B. slew rate

C. input offset voltage

D. input offset current

Solution:

353. For ac-amplifiers using op-amps what parameters can affect its performance.

A. input offset current and voltage

B. input bias current and voltage

C. drift and slew rate

D. slew rate and frequency response

Solution:

354. If an op-amp is used to amplify small ac-signals, what parameter you should greatly consider to ensure better performance?

A. input bias current

B. drift

C. frequency response

D. slew rate

Solution:

355. What do we mean by internally compensated op-amps?

A. Op-amps with internal frequency compensation capacitor to prevent oscillation.

B. Op-amps with an internal compensating resistor to make the output offset voltage zero.

C. Op-amps with internal coupling capacitor to block dc-voltages and allows ac voltages to pass.

D. Op-amps with internal active components to make its gain constant at the entire operating frequency.

Solution:

356. The frequency at which the open-loop gain of an op-amp is 0.707 times its value at very low frequency

A. threshold frequency

B. break frequency

C. minimum frequency

D. operating frequency

Solution:

357. What will happen to the voltage gain of op-amp when its operating frequency is increased?

A. also increases

B. increases exponentially

C. will decrease

D. decreases exponentially

Solution:

358. The reduction of op-amps gain due to increasing operating frequency.

A. Cutoff

B. roll-off

C. diminishing factor

D. reduction step

Solution:

359. What do we mean by a 20 dB/decade roll-off?

A. a gain reduction by a factor of 10 per decade

B. a gain reduction by a factor of 20 per decade

C. a gain reduction by a factor of 10 per 10 Hz increased in frequency

D. a gain reduction by a factor of 20 per 10 Hz increased in frequency

Solution:

360. A reduction of op-amp’s voltage gain by a factor of two each time the frequency doubles.

A. 2 dB/octave

C. 6 dB/octave

Solution:

361. Frequency at which the voltage gain of op-amp reduces to unity.

A. unity-gain frequency

B. cutoff frequency

C. bandwidth point

D. unity-gain bandwidth product

Solution:

362. The low and high cutoff frequencies of an amplifier is also called

A. corner frequencies

B. 0.707 frequencies

C. 3-dB frequencies

D. all of these are correct

Solution:

363. Calculate the cutoff frequency (fc) of an op-amp having a unity-gain bandwidth product B1 = 1 MHz and a open-loop voltage gain AOL = 100,000.

A. 10 Hz

B. 20 Hz

C. 100 Hz

D. 200 Hz

Solution:

364. An op-amp has a specified transient response rise time of 0.3 µs, calculate its unity-gain bandwidth.

A. 0.857 MHz

B. 1.0 MHz

C. 1.167 MHz

D. 2.334 MHz

Solution:

365. Rise time is defined as the time required for the output voltage to rise from _______ to ________ of its final value.

A. 0% – 100%

B. 1% – 99%

C. 5% – 95%

D. 10% – 90%

Solution:

366. The maximum output voltage rate of change of an op-amp.

A. rise time

B. maximum voltage swing

C. differential rate

D. slew rate

Solution:

367. Factor(s) or parameter(s) that determine(s) the op-amps maximum operating temperature

A. PSRR

B. slew rate

C. unity-gain bandwidth product

D. B and C above

Solution:

368. What is the maximum signal frequency that can be used in an op-amp having a specified slew rate of 0.5 V/µsec? The maximum output voltage desired is 5 V.

A. 16 kHz

B. 32 kHz

C. 100 kHz

D. 1 MHz

Solution:

369. What must be the slew rate of an op-amp to be used in order to provide an undistorted output voltage of .10 V ac a frequency of 100,000 rad/sec?

A. 0.1 V/µsec

B. 0.5 V/µsec

C. 1.0 V/µsec

D. 6.28 V/µsec

Solution:

370. When an op-amp is used as a comparator, the output voltage would be +VSAT if

A. V+ > V-

B. V- > V+

C. V- = V+

D. V- and V+ are both zero

Solution:

371. Two comparators using op-amps, configured such that it can detect voltage levels within a certain range of values rather than simply comparing whether a voltage is above or below a certain reference.

A. analog comparator

B. regenerative comparator

C. parallel comparator

D. window comparator

Solution:

372. What gain is significant when an op-amp is used as a voltage comparator?

A. open-loop gain

B. common gain

C. differential closed loop gain

D. closed loop gain

Solution:

373. An op-amp zero-crossing detector without hysteresis,

A. uses a resistor as its feedback element

B. uses a capacitor as its feedback element

C. uses an inductor as its feedback element

D. has no feedback

Solution:

374. The feedback element of a differentiator constructed from op-amp is

A. a resistor

B. an inductor

C. a capacitor

D. an RC network

Solution:

375. An active integrator uses an op-amp, what is its feedback element?

A. Resistor

B. capacitor

C. inductor

D. RC network

Solution:

376. The voltage gain of an op-amp voltage follower.

A. unity

B. Rf/Ri

C. 1 + Rf/Ri

D. depends on the type of op-amp

Solution:

377. Calculate the closed-loop voltage gain of an inverting amplifier having a feedback and an input resistance of 100 kΩ and 10 kΩ, respectively.

A. 10

B. 11

C. 100

D. 110

Solution:

378. The gain of an inverting amplifier is determined by the ratio of the feedback and input resistors (Rf/Ri), meaning we can select any value of resistors as long as its ratio is the same. What op-amp parameter that helps us determine the appropriate values of these resistors?

A. CMRR

B. PSRR

C. SR

D. input bias current

Solution:

379. What is the noise gain of op-amps?

A. equal to the open loop gain

B. Rf/Ri

C. 1 + Rf/Ri

D. equal to the common gain

Solution:

380. A unity-gain summing amplifier has three inputs, V1 = 1.0 mV, V2 = 1.5 mV, and V3 = 2.5 mV, calculate the total output voltage.

A. 2.5 mV

B. 3.5 mV

C. 4.0 mV

D. 5.0 mV

Solution:

381. The random voltage at the output of an op-amp which could occupy the entire bandwidth.

A. noise

B. hash

C. interference

D. all of the above

Solution:

382. Which of the following of the resistor combinations that provides lesser noise in op-amp circuits?

A. Make both the feedback and input resistances as large as possible

B. Make the feedback as large as possible, while the input as low as possible.

C. Make the feedback as low as possible, while the input as large as possible.

D. Make the feedback and input resistances as small as possible.

Solution:

383. In most ac-amplifiers using op-amps, the feedback resistor is shunted with a very small capacitance, what is its purpose?

A. to prevent oscillation

B. to improve stability

C. to minimize high frequency noise

D. to compensate for high frequency loss

Solution:

384. Approximate the noise gain of an inverting adder using op-amps if it has five inputs.

A. unity (1)

B. two (2)

C. four (4)

D. six (6)

Solution:

385. Op-amps with internal frequency compensation are very stable with respect to signal frequencies. However, the trade-off for frequency stability is (are)

A. limited small-signal bandwidth

B. slow slew rate

C. limited open-loop frequency response

D. all of these

Solution:

386. What do we mean by externally compensated op-amps?

A. op-amps with frequency-compensation terminals

B. op-amps with provision to externally compensate for frequency stability

C. op-amps whose gain is externally compensated

D. A and B above

Solution:

387. What is true about the external frequency-compensation capacitor?

A. the higher its value, the wider is its bandwidth

B. the lower its value, the wider is its bandwidth

C. the higher its value, the faster its slew rate

D. A and C above

Solution:

388. Typical value of the external frequency-compensating capacitor of op-amps.

A. 3 – 30 nF

B. 30 – 300 nF

C. 0.3 – 3.0 µF

D. 3.0 – 30 µF

Solution:

389. What do we mean by a general-purpose op-amps?

A. op-amps with limited unity-gain bandwidth up to approximately 1 MHz

B. op-amps with slew rate about 0.5 V/µsec

C. op-amps that has unlimited application

D. A and B above

Solution:

390. Op-amps designed to operate at high slew rate, about 2000 V/µsec and at high frequencies, more than 50 MHz.

A. general purpose op-amps

B. high power op-amps

C. high-stability op-amps

D. high-frequency, high-slew rate op-amps

Solution:

391. Generally, where does hybrid op-amps found its application?

A. for high-output voltage

B. for high-output current

C. for high-frequency

D. A and B above

Solution:

392. The magnitude of the op-amps input offset voltage before it can be classified as a low-input offset voltage op-amp

A. 0.2 mV

B. 2.0 mV

C. 2.5 mV

D. 5.0 mV

Solution:

393. Op-amps whose internal transistor biasing can be controlled externally are categorize as

A. general purpose op-amps

B. programmable op-amps

C. variable op-amps

D. externally compensated op-amps

Solution:

394. What op-amp parameter(s) that can be governed by the bias control in a programmable op-amp?

A. open-loop gain and slew rate

B. unity-gain bandwidth

C. input bias current

D. all of the above

Solution:

395. The most popular op-amp packages are the metal can, 8-pin DIP, and the SMT. Which of these corresponds to TO-99?

A. metal can

B. 8-pin DIP

C. SMT

D. all of the above

Solution:

396. Dual-in-line or DIL package is designated as

A. TO-99

B. TO-91

C. TO-116

D. TO-220

Solution:

397. For high density ICs involving many op-amps, what packaging is suitable?

A. metal can

B. 14-pin DIL

C. SMT

D. flat-pack

Solution:

398. Example(s) of surface-mounted technology (SMT) devices.

A. PLCCs

B. SOICs

C. LCCCs

D. all of the above

Solution:

399. Which condition must exist for a circuit to oscillate?

A. It must have a negative feedback sufficient to cancel the input

B. It must have a gain of less than 1

C. It must have a positive feedback sufficient to overcome losses

D. It must be neutralized

Solution:

400. Which of the following is not an essential part of an oscillator?

A. Source of energy that supply the losses in tank circuit.

B. A resistor IC combination circuit.

C. Resonant circuit consist of inductance and capacitance.

D. Regenerative feedback circuit.

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: MCQs from Number 1 – 50                        Answer key: PART 1
PART 2: MCQs from Number 51 – 100                   Answer key: PART 2
PART 3: MCQs from Number 101 – 150                 Answer key: PART 3
PART 4: MCQs from Number 151 – 200                 Answer key: PART 4
PART 5: MCQs from Number 201 – 250                 Answer key: PART 5
PART 6: MCQs from Number 251 – 300                 Answer key: included
PART 7: MCQs from Number 301 – 350                 Answer key: included
PART 8: MCQs from Number 351 – 400                 Answer key: included
PART 9: MCQs from Number 401 – 415                 Answer key: included

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

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