# MCQ in Electronic Circuits Part 12 | ECE Board Exam

(Last Updated On: July 26, 2022) This is the Multiples Choice Questions Part 12 of the Series in Electronic Circuit (Audio/RF), 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 12 of the Series

Choose the letter of the best answer in each questions.

551. A common-source amplifier is similar in configuration to which BJT amplifier?

A. common-base

B. common- collector

C. common-emitter

D. emitter- follower

Solution:

552. When transistors are used in digital circuits they usually operate in the

A. active region

B. breakdown region

C. saturation and cutoff regions

D. linear region

Solution:

553. Which of the following elements are important in determining the gain of the system in the high-frequency region?

A. interelectrode capacitances

B. wiring capacitances

C. miller effect capacitance

D. all of the above

Solution:

554. For audio systems, the reference level is generally accepted as                .

A. 1 mw

B. 1 w

C. 10 mw

D. 100 mw

Solution:

555. What is the normalized gain expressed in dB for the cutoff frequencies?

A. –3 db

B. +3 db

C. –6 db

D. –20 db

Solution:

556. Which of the following configurations does not involve the Miller effect capacitance?

A. common-emitter

B. common-base

C. common- collector

D. all of the above

Solution:

557. When transistors are used in digital circuits they usually operate in the

A. active region

B. saturation and cutoff regions

C. breakdown region

D. linear region

Solution:

558. A current ratio of IC/IE is usually less than one and is called

A. omega

B. beta

C. theta

D. alpha

Solution:

559. A transistor may be used as a switching device or as a:

A. tuning device

B. rectifier

C. fixed resistor

D. variable resistor

Solution:

560. Most of the electrons in the base of an NPN transistor flow:

A. into the collector

B. into the emitter

C. out of the base lead

D. into the base supply

Solution:

561. The BJT is a device. The FET is a device.

A. bipolar, bipolar

B. bipolar, unipolar

C. unipolar, bipolar

D. unipolar, unipolar

Solution:

562. The Bode plot is applicable to

A. all phase network

B. minimum phase network

C. maximum phase network

Solution:

563. For any inverting amplifier, the impedance capacitance will be ______ by a Miller effect capacitance sensitive to the gain of the amplifier and the interelectrode capacitance.

A. unaffected

B. increased

C. decreased

D. none of the above

Solution:

564. The dc emitter current of a transistor is 8 mA. What is the value of re?

A. 320 Ω

B. 13.3 kΩ

C. 3.125 Ω

D. 5.75 Ω

Solution:

565. An emitter-follower amplifier has an input impedance of 107 kΩ. The input signal is 12 mV. The approximate output voltage is (common-collector)

A. 8.92 v

B. 112 mv

C. 12 mv

D. 8.9 mv

Solution:

566. You have a need to apply an amplifier with a very high power gain. Which of the following would you choose?

A. common-collector

B. common-base

C. common-emitter

D. emitter- follower

Solution:

567. What is the most important r parameter for amplifier analysis?

A. rb′

B. rc′

C. re′

D. none of the above

Solution:

568. A common-emitter amplifier has voltage gain, current gain, power gain, and input impedance.

A. high, low, high, low

B. high, high, high, low

C. high, high, high, high

D. low, low, low, high

Solution:

569. To analyze the common-emitter amplifier, what must be done to determine the dc equivalent circuit?

A. leave circuit unchanged

B. replace coupling and bypass capacitors with opens

C. replace coupling and bypass capacitors with shorts

D. replace vcc with ground

Solution:

570. What is re equal to in terms of h parameters?

A. hre / hoe

B. (hre + 1) / hoe

C. hie – (hre / hoe)(1+ hfe)

D. hfe

Solution:

571. The advantage that a Sziklai pair has over a Darlington pair is

A. higher current gain.

B. less input voltage is needed to turn it on.

C. higher input impedance.

D. higher voltage gain.

Solution:

572. What is the device in a transistor oscillator?

A. LC tank circuit

B. biasing circuit

C. transistor

D. feedback circuit

Solution:

573. When the collector supply is 5 V, then collector cut off voltage under dc condition is

A. 20 v

B. 10 v

C. 2.5 v

D. 5 v

Solution:

574. The common base (CB) amplifier has a compared to CE and CC amplifier.

A. lower input resistance

B. larger current gain

C. larger voltage gain

D. higher input resistance

Solution:

575. When a FET with a lower transconductance is substituted into a FET amplifier circuit, what happens?

A. the current gain does not change

B. the voltage gain decreases

C. the circuit disamplifies

D. the input resistance decreases

Solution:

576. At zero signal condition, a transistor sees load.

A. dc

B. ac

C. both dc and ac

D. resistive

Solution:

577. What is the gain of an amplifier with negative feedback if the feedback factor is 0.01?

A. 10

B. 1000

C. 100

D. 500

Solution:

578. The current gain of an emitter follower is

A. equal to 1

B. greater than 1

C. less than 1

D. zero

Solution:

579. The current in any branch of a transistor amplifier that is operating is

A. ac only

B. the sum of ac and dc

C. the difference of ac and dc

D. dc only

Solution:

580. An ideal differential amplifiers common mode rejection ratio is

A. infinite

B. zero

C. unity

D. undetermined

Solution:

581. An open fuse circuit has a resistance equal to

A. zero

B. unity

C. at least 100 Ω atstandard

D. infinity

Solution:

582. What is the purpose of dc conditions in a transistor?

A. to reverse bias the emitter

B. to forward bias the emitter

C. to set up operating point

D. to turn on the transistor

Solution:

583. The ac variations at the output side of power supply circuits are called .

A. ripples

B. pulses

C. waves

D. filters

Solution:

584. What is the purpose of the emitter capacitor?

A. to forward bias the emitter

B. to reduce noise in the amplifier

C. to avoid drop in gain

D. to stabilize emitter voltage

Solution:

585. A common emitter circuit is also called circuit.

A. grounded emitter

B. grounded collector

C. grounded base

D. emitter follower

Solution:

586. The output signal of a common-collector amplifier is always

A. larger than the input signal

B. in phase with the input signal

C. out of phase with the input signal

D. exactly equal to the input signal

Solution:

587. Calculate the ripples of the filter output if a dc and ac voltmeter is used and measures the output signal from a filter circuit of 25 VDC and 1.5 Vrms

A. 5%

B. 10%

C. 50%

D. 6%

Solution:

588. What is the ideal maximum voltage gain of a common collector amplifier?

A. unity

B. infinite

C. indeterminate

D. zero

Solution:

589. The output power of a transistor amplifier is more than the input power due to additional power supplied by

A. transistor

B. collector supply

C. emitter supply

D. base supply

Solution:

590. When a transistor amplifier feeds a load of low resistance, its voltage gain will be

A. low

B. very high

C. high

D. moderate

Solution:

591. The capacitors are considered in the ac equivalent circuit of a transistor amplifier.

A. open

B. partially open

C. short

D. partially short

Solution:

592. For highest power gain, what configuration is used?

A. cc

B. cb

C. ce

D. cs

Solution:

593. What is the most important characteristic of a common collector amplifier?

A. high input voltage

B. high input resistance

C. high output resistance

D. its being an amplifier circuit

Solution:

594. Which of the item below does not describe a common emitter amplifier?

A. high voltage gain

B. high current gain

C. very high power gain

D. high input resistance

Solution:

595. CC configuration is used for impedance matching because its

A. input impedance is very high

B. input impedance is very low

C. output impedance is very low

D. output impedance is zero

Solution:

596. Which of the following is the other name of the output stage in an amplifier?

B. audio stage

C. power stage

D. rf stage

Solution:

A. the gain of each amplifier is increased

B. a lower supply voltage is required

C. the overall gain is increased

D. each amplifier has to work less

Solution:

598. Ina common emitter amplifier, the capacitor from emitter to ground is called the

A. coupling capacitor

B. bypass capacitor

C. decoupling capacitor

D. tuning capacitor

Solution:

599. A class A power amplifier uses transistor(s).

A. two

B. one

C. three

D. four

Solution:

600. What is the maximum collector efficiency of a resistance loaded class A power amplifier?

A. 50%

B. 78.50%

C. 25%

D. 30%

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 – 450                 Answer key: included
PART 10: MCQs from Number 451 – 500                 Answer key: included

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

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