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# MCQ in Electronic Circuits Part 10 | ECE Board Exam

This is the Multiple Choice Questions in Electronic Circuits (Electronic Devices and Circuits, Electronic Circuit Analysis and Design) Part 10 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 10 of the Series

Choose the letter of the best answer in each questions.

451. 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:

452. It is a very high-gain differential amplifier with very high input impedance and very low output impedance.

A. par-amp

B. op-amp

C. differential amp

D. complementary amp

Solution:

453. Ideally, op-amps have infinite input resistance and ________ output resistance.

A. infinite

B. zero

C. variable

D. a highly stabilized

Solution:

454. When the same signal is applied to both inverting and non-inverting input terminals of an ideal op-amp, the output voltage would be

A. zero (0) V

B. +VSAT

C. โVSAT

D. offset voltage

Solution:

455. The operating mode of an op-amp, when both inputs are tied together or when the input signal is common to both inputs.

A. differential mode

B. rejection mode

C. double-ended mode

D. common mode

Solution:

456. What do you call of the gain of an op-amp if operated in common mode input?

A. differential gain

B. common gain

C. double-ended gain

D. rejection gain

Solution:

457. When one input of the op-amp is connected to ground and the other is to the signal source, its operation is called

A. single-ended output

B. double-ended output

C. single-ended input

D. double-ended input

Solution:

458. If op-amps are operated in differential mode, its gain is technically termed as

A. common-mode differential gain

B. differential gain

C. open-loop gain

D. closed-loop gain

Solution:

459. The ratio of the differential gain and common gain of an op-amp

A. differential-common mode ratio

B. common-mode ratio

C. differential-mode rejection ratio

D. common-mode rejection ratio

Solution:

460. An operational amplifier has a common-mode voltage gain of 10 and a differential-mode voltage gain of 20,000, calculate its common-mode rejection ratio (CMRR).

A. 200

B. 2,000

C. 20,000

D. 200,000

Solution:

461. Calculate the CMRR of an op-amp having a common-mode gain of 10 and a differential-mode gain of 100,000.

A. 1000 dB

B. 100 dB

C. 80 dB

D. 40 dB

Solution:

462. What is the maximum output voltage swing of an op-amp?

A. +V to -V (supply voltage)

B. +VSAT to -VSAT

C. +ยฝV to -ยฝV

D. depends on the input signal

Solution:

463. The ยตA741 op-amp has a CMRR of 90dB and a differential-mode voltage amplification of 200,000.What is the op-ampโs common-mode voltage gain?

A. 31,622.778

B. 632.40

C. 6.324

D. 0.158

Solution:

464. The current needed at the input of an op-amp to operate it normally

A. input bias current

B. input offset current

C. input threshold current

D. input holding current

Solution:

465. Ideal op-amp requires no input current, but real op-amp needs a very small input current called input bias current. At both inputs, the bias currents have a slight difference. What do you call this difference?

A. differential input current

B. differential bias

C. input offset difference

D. input offset current

Solution:

466. The change in input offset current due to temperature change

A. delta input offset current

B. slew rate

C. input offset current drift

D. PSRR

Solution:

467. It is known through experiment that the input bias currents at the non-inverting (IB+) and inverting (IB-) inputs of a certain op-amp is 100 nA and 80 nA, respectively. Determine the op-ampโs input offset current.

A. -20 nA

B. 20 nA

C. 90 nA

D. 180 nA

Solution:

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

A. Cutoff

B. roll-off

C. diminishing factor

D. reduction step

Solution:

469. A reduction of op-ampโs voltage gain by a factor of two each time the frequency doubles.

A. 2 dB/octave

C. 6 dB/octave

Solution:

470. 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:

471. 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:

472. 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:

473. 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:

474. 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:

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

A. Resistor

B. capacitor

C. inductor

D. RC network

Solution:

476. 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:

477. Calculate the closed-loop voltage gain of an inverting amplifier having a feedback and an input resistance of 100 kโฆ and 10 kโฆ, respectively.

A. 10

B. 11

C. 100

D. 110

Solution:

478. 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:

479. 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:

480. Circuits that produces alternating or pulsating current or voltage.

A. Damper

B. Generator

C. oscillator

D. mixer

Solution:

481. What do you call the oscillator circuit that uses a tapped coli in the tuned circuit?

A. Pierce

B. Colpitts

C. Hartley

D. Ultraudion

Solution:

482. What determines the resonant frequency of a crystal?

A. external components

B. the temperature of the crystal

C. the size and thickness of the crystal material

D. the hermitic seal

Solution:

483. A self-excited oscillator in which the tank is divided into input and feedback portions by a capacitive voltage divider.

A. Hartley capacitor

B. Colpitts oscillator

C. Relaxation oscillator

D. Klystron oscillator

Solution:

484. A self-excited oscillator in which the tank is divided into input and feedback portions by an inductive voltage divider or a tapped coil.

A. Hartley oscillator

B. Copitts oscillator

C. Relaxation oscillator

D. Klystron oscillator

Solution:

485. A circuit usually containing two transistors or tubes in an RC-coupled amplifier, the two active devices switch each other alternately on and off.

A. Multivibrator

B. Signal generator

C. Oscillator

D. Thyristor

Solution:

486. A multivibrator that generates one output pulse for each input trigger pulse.

A. monostable

B. astable

C. bistable

D. tristate

Solution:

487. Monostable multivibrator is also known as

A. one shot

B. single shot

C. direct shot

D. one shot or single shot

Solution:

488. What determines the pulse time in a monostable multivibrator?

A. resistor combinations

B. capacitor combinations

C. inductor combinations

D. resistor and capacitor combinations

Solution:

489. A multivibrator having two stable state

A. monostable

B. bistable

C. astable

D. unstable

Solution:

490. Is also known as Eccles/Jordan circuit

A. Monostable multivibrator

B. bistable multivibrator

C. astable multivibrator

D. unstable multivibrator

Solution:

491. Flip-flop is actually a _______ multivibrator.

A. Monostable

B. bistable

C. astable

D. unstable

Solution:

492. Considered as a free-running multivibrator

A. monostable

B. bistable

C. astable

D. unstable

Solution:

493. Filter that is characterized by a relatively flat passband and slow roll-off rate

a. Butterworth

b. Elliptic

c. Chebyshev

d. Notch

Solution:

494. Filter that is characterized by ripple at the passband and fast roll-off rate

a. Butterworth

b. Elliptic

c. Chebyshev

d. Notch

Solution:

495. An LC circuit resonates at 2000 kHz and has a Q of 100. Find the lower and upper cut-off frequencies.

a. 1980 kHz, 2020 kHz

b. 1950 kHz, 2050 kHz

c. 1990 kHz, 2010 kHz

d. 1900 kHz, 2100 kHz

Solution:

496. What is the resonant frequency of a circuit when L is 1 microhenry and C is 10 picofarads are in series?

a. 50.3 MHz

b. 15.9 MHz

c. 15.9 kHz

d. 50.3 kHz

Solution:

497. What happens to the input resistance of an amplifier employing voltage-series feedback?

a. It is increased

b. It remains the same

c. It is decreased

d. Equals infinity

Solution:

498. What happens to the output resistance of an amplifier employing voltage-shunt feedback?

a. It is increased

b. It remains the same

c. It is decreased

d. Equals infinity

Solution:

499. If the gain of an amplifier without feedback is 10 and with negative feedback is 8, then the feedback fraction is

a. 0.025

b. 0.9

c. 0.8

d. 0.225

Solution:

500. _____ is the progressive decay with time in the amplitude of the free oscillation in a circuit.

a. Decrement

b. Pulse decay time

c. Damping

d. Dancing

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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