# MCQ in Electronic Circuits Part 11 | ECE Board Exam

(Last Updated On: July 26, 2022) This is the Multiples Choice Questions Part 11 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 11 of the Series

Choose the letter of the best answer in each questions.

501. A transistor has how many PN junctions?

A. 1

B. 2

C. 3

D. 4

Solution:

502. In an NPN transistor, the majority carriers in the emitter are

A. free electrons

B. holes

C. neither

D. both

Solution:

503. The barrier potential across each silicon depletion layer is

A. 0 v

B. 0.3 v

C. 0.7 v

D. 1 v

Solution:

504. The base of an NPN transistor is thin and

A. heavily doped

B. lightly doped

C. metallic

D. doped by a pentavalent material

Solution:

505. The emitter of a transistor is generally doped the heaviest because it

A. has to dissipate maximum power

B. has to supply the charge carriers

C. is the first region of the transistor

D. must possess low resistance

Solution:

506. When a transistor is fully switched ON, it is said to be

A. shorted

B. saturated

C. open

D. cut-off

Solution:

507. A FET consists of a

A. source

B. drain

C. gate

D. all the above

Solution:

508. The extremely high input impedance of a MOSFET is primarily due to the

A. absence of its channel

B. negative gate- source voltage

C. depletion of current carriers

D. extremely small leakage current of its gate capacitor

Solution:

509. When a transistor is used as a switch, it is stable in which two distinct regions?

A. saturation and active

B. active and cutoff

C. saturation and cutoff

D. none of the above

Solution:

510. The term BJT is short for

A. base junction transistor

B. binary junction transistor

C. both junction transistor

D. bipolar junction transistor

Solution:

511. What are the two types of bipolar junction transistors?

A. NPN and PNP

B. PNN and NNP

C. PPN and NNP

D. PTS and STP

Solution:

512. The magnitude of dark current in a phototransistor usually falls in what range?

A. ma

B. ma

C. na

D. pa

Solution:

513. Junction Field Effect Transistors (JFET) contain how many diodes?

A. 4

B. 3

C. 2

D. 1

Solution:

514. When not in use, MOSFET pins are kept at the same potential through the use of:

A. shipping foil

B. nonconductive foam

C. conductive foam

D. a wrist strap

Solution:

515. A MOSFET has how many terminals?

A. 2 or 3

B. 3

C. 4

D. 3 or 4

Solution:

516. A very simple bias for a D-MOSFET is called:

A. self biasing

B. gate biasing

C. zero biasing

D. voltage- divider biasing

Solution:

517. Hybrid means

A. mixed

B. single

C. biunique

D. none of the above

Solution:

518. There are h- parameters of a transistor.

A. two

B. four

C. three

D. none of the above

Solution:

519. The h- parameter approach gives correct results for

A. large signals only

B. small signals only

C. both small and large signals

D. none of the above

Solution:

520. If the operating point changes, the h-parameters of transistor

A. also change

B. do not change

C. may or may not change

D. none of above

Solution:

521. The dc load line on a family of collector characteristic curves of a transistor shows the

A. saturation region.

B. cutoff region.

C. active region.

D. all of the above

Solution:

522. When a transistor is used as a switch, it is stable in which two distinct regions?

A. saturation and active

B. active and cutoff

C. saturation and cutoff

D. none of the above

Solution:

523. The value of βDC

A. is fixed for any particular transistor.

B. varies with temperature.

C. varies with ic.

D. varies with temperature and ic.

Solution:

524. A BJT has an IB of 50 µA and a βDC of 75; IC is:

A. 375 ma

B. 37.5 ma

C. 3.75 ma

D. 0.375 ma

Solution:

525. A certain transistor has IC = 15 mA and IB = 167 µA; βDC is:

A. 15

B. 167

C. 0.011

D. 90

Solution:

526. For normal operation of a PNP BJT, the base must be with respect to the emitter and with respect to the collector.

A. positive, negative

B. positive, positive

C. negative, positive

D. negative, negative

Solution:

527. A transistor amplifier has a voltage gain of 100. If the input voltage is 75 mV, the output voltage is:

A. 1.33 v

B. 7.5 v

C. 13.3 v

D. 15 v

Solution:

528. A 35 mV signal is applied to the base of a properly biased transistor with an r’e = 8 Ω and RC = 1 kΩ. The output signal voltage at the collector is:

A. 3.5 v

B. 28.57 v

C. 4.375 v

D. 4.375 mv

Solution:

529. What is the order of doping, from heavily to lightly doped, for each region?

A. base, collector, emitter

B. emitter, collector, base

C. emitter, base, collector

D. collector, emitter, base

Solution:

530. Which of the following is true for an NPN or PNP transistor?

A. ie = ib + ic

B. ib = ic+ ie

C. ic = ib + ie

D. none of the above

Solution:

531. In what range of voltages is the transistor in the linear region of its operation?

A. 0 < vce

B. 0.7 < vce < vce(max)

C. vce(max) > vce

D. none of the above

Solution:

532. What does DC vary with?

A. ic

B. °c

C. both ic and °c

D. ic’, but not °c

Solution:

533. What is (are) common fault(s) in a BJT-based circuit?

A. pens or shorts internal to the transistor

B. open bias resistor(s)

C. external opens and shorts on the circuit board

D. all of the above

Solution:

534. What is (are) general-purpose/small-signal transistors case type(s)?

A. to-18

B. to-92

C. to-39

D. all of the above

Solution:

535. The magnitude of dark current in a phototransistor usually falls in what range?

A. ma

B. μa

C. na

D. pa

Solution:

536. Which of the following devices has the highest input resistance?

A. diode

B. jfet

C. mosfet

D. bipolar junction transistor

Solution:

537. A self-biased n-channel JFET has a VD = 6 V. VGS = –3 V. Find the value of VDS.

A. –3 v

B. –6 v

C. 3 v

D. 6 v

Solution:

538. A JFET data sheet specifies VGS(off) = –6 V and IDSS = 8 mA. Find the value of ID when VGS = –3 V.

A. 2 ma

B. 4 ma

C. 8 ma

D. none of the above

Solution:

539. A JFET data sheet specifies VGS(off) = –10 V and IDSS = 8 mA. Find the value of ID when VGS = –3 V.

A. 2 ma

B. 1.4 ma

C. 4.8 ma

D. 3.92 ma

Solution:

540. The JFET is always operated with the gate-source PN junction-biased.

A. forward

B. reverse

C. all of the above

D. none of the above

Solution:

541. What type(s) of gate-to-source voltage(s) can a depletion MOSFET (D-MOSFET) operate with?

A. zero

B. positive

C. negative

D. any of the above

Solution:

542. The has a physical channel between the drain and source.

A. d-mosfet

B. e-mosfet

C. v-mosfet

D. none of the above

Solution:

543. All MOSFETs are subject to damage from electrostatic discharge (ESD).

A. true

B. false

Solution:

544. Midpoint bias for a D-MOSFET is ID = , obtained by setting VGS = 0.

A. idss /2

B. idss /3.4

C. idss

D. None of these

Solution:

545. If VD is less than expected (normal) for a self-biased JFET circuit, then it could be caused by a(n)

A. open rg.

C. fet internally open at gate.

D. all of the above

Solution:

546. A coupling capacitor is

A. a dc short

B. an ac open

C. a dc open and an ac short

D. a dc short and an ac open

Solution:

547. In a bypass circuit, the top of a capacitor is

A. an open

B. a short

C. an ac ground

D. a mechanical ground

Solution:

548. The capacitor that produces an ac ground is called a

A. bypass capacitor

B. coupling capacitor

C. dc open

D. ac open

Solution:

549. The output voltage of a CE amplifier is

A. amplified

B. inverted

C. 180° out of phase with the input

D. all of the above

Solution:

550. A common-gate amplifier is similar in configuration to which BJT amplifier?

A. common-emitter

B. common- collector

C. common-base

D. emitter- follower

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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