# MCQ in Electronic Circuits Part 13 | ECE Board Exam

(Last Updated On: July 26, 2022) This is the Multiples Choice Questions Part 13 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 13 of the Series

Choose the letter of the best answer in each questions.

601. What is the maximum collector efficiency of a transformer coupled class A power amplifier?

A. 30%

B. 80%

C. 45%

D. 50%

Solution:

602. Class C amplifiers are used as

A. af amplifiers

B. small signal amplifiers

C. rf amplifiers

D. if amplifiers

Solution:

603. Find the voltage drop developed across a D’ Arsonval meter movement having an internal resistance of 1 kΩ and a full deflection current of 150 µA.

A. 150 µv

B. 150 mv

C. 150 v

D. 200 mv

Solution:

604. If the capacitor from emitter to ground in a common emitter amplifier is removed, the voltage gain

A. increases

B. decreases

C. becomes erratic

D. remains the same

Solution:

605. Comparatively, power amplifier has β.

A. large

B. very large

C. small

D. very small

Solution:

606. The driver stage usually employs amplifier.

A. class a power

B. class c

C. push-pull

D. class ab

Solution:

607. The push-pull circuit must use operation.

A. class a

B. class b

C. class c

D. class ab

Solution:

608. A complementary-symmetry amplifier has

A. one PNP and one NPN transistor

B. two PNP transistors

C. two NPN transistors

D. two PNP and two NPN transistors

Solution:

609. Power amplifiers generally use transformer coupling because transformer coupling provides

A. cooling of the circuit

B. distortionless output

C. impedance matching

D. good frequency response

Solution:

610. The output transformer used in a power amplifier is a/an ______ transformer

A. 1:1 ratio

B. step-down

C. step-up

D. isolation

Solution:

611. An emitter follower has a voltage gain that is

A. much less than one

B. approximately equal to one

C. greater than one

D. zero

Solution:

612. The input impedance of the base of an emitter follower is usually

A. low

B. high

C. shorted to ground

D. open

Solution:

613. The ac base voltage of an emitter follower is across the

A. emitter diode

B. dc emitter resistor

D. emitter diode and external ac emitter resistance

Solution:

614. The output voltage of an emitter follower is across the

A. emitter diode

B. dc collector resistor

D. emitter diode and external ac emitter resistance

Solution:

615. The differential amplifier has

A. one input and one output

B. two inputs and two outputs

C. two inputs and one output

D. one input and two outputs

Solution:

616. The differential amplifier produces outputs that are

A. common mode

B. in-phase with the input voltages

C. the sum of the two input voltages

D. the difference of the two input voltages

Solution:

A. charging time associated with the output resistance of the driving gate

B. discharging time associated with the output resistance of the driving gate

C. output capacitance of the load gates

D. input capacitance of the load gates

Solution:

618. Which transistor element is used in CMOS logic?

A. fet

B. mosfet

C. bipolar

D. unijunction

Solution:

619. A Darlington pair is used for

A. low distortion

B. high frequency range

C. high power gain

D. high current gain

Solution:

620. What is the effect of cascading amplifier stages?

A. increase in the voltage gain and increase in the bandwidth

B. increase in the voltage gain and reduction in the bandwidth

C. decrease in the voltage gain and increase in the bandwidth

D. increase in the voltage gain and reduction in the bandwidth

Solution:

621. An open-drain gate is the CMOS counterpart of

A. an open-collector TTL gate

B. a tristate TTL gate

C. a bipolar junction transistor

D. an emitter- coupled logic gate

Solution:

622. The decibel gain of a cascaded amplifier equals to

A. product of individual gains

B. sum of individual gains

C. ration of stage gains

D. product of voltage and current gains

Solution:

623. The most desirable feature of transformer coupling is its

A. higher voltage gain

B. wide frequency range

C. ability to provide impedance matching between stages

D. ability to eliminate hum from the output

Solution:

624. A transformer coupled amplifier would give

A. maximum voltage gain

B. impedance matching

C. maximum current gain

D. larger bandwidth

Solution:

625. One of the advantages of a Darlington pair is that it has enormous ______ transformation capacity.

A. voltage

B. current

C. impedance

D. power

Solution:

626. Bootstrapping is used in emitter follower configurations to

A. stabilize the voltage gain against process variations

B. increase current gain

C. reduce the output resistance

D. increase the input resistance

Solution:

627. To determine the polarity of the voltage drop across a resistor, it is necessary to know

A. value of current through the resistor

B. direction of current through the resistor

C. value of resistor

D. e.m.fs. in the circuit

Solution:

628. “Maximum power output is obtained from a network when the load resistance is equal to the output resistance of the network as seen from the terminals of the load”. The above statement is associated with

A. mill man’s theorem

B. thevenin\s theorem

C. superposition theorem

D. maximum power transfer theorem

Solution:

629. “In any linear bilateral network, if a source of e.m.f. E in any branch produces a current I in any other branch, then same e.m.f. acting in the second branch would produce the same current / in the first branch”. The above statement is associated with

A. compensation theorem

B. superposition theorem

C. reciprocity theorem

D. none of the above

Solution:

630. Which of the following is non-linear circuit parameter?

A. inductance

B. condenser

C. wire wound resistor

D. transistor

Solution:

631. A capacitor is generally a

A. bilateral and active

B. active, passive,

C. linear and bilateral

D. non-linear and

Solution:

632. “In any network containing more than one sources of e.m.f. the current in any branch is the algebraic sum of a number of individual fictitious currents (the number being equal to the number of sources of e.m.f.), each of which is due to separate action of each source of e.m.f., taken in order, when the remaining sources of e.m.f. are replaced by conductors, the resistances of which are equal to the internal resistances of the respective sources”. The above statement is associated with

A. thevenin\s theorem

B. norton\s theorem

C. superposition theorem

D. none of the above

Solution:

633. Kirchhoff s law is applicable to

A. passive networks only

B. a.c. circuits only

C. d.c. circuits only

D. both a.c. as well d.c. circuits

Solution:

634. Kirchhoff s law is not applicable to circuits with

A. lumped parameters

B. passive elements

C. distributed parameters

D. non-linear resistances

Solution:

635. The resistance LM will be

A. 6.66 q

B. 12 q

C. 18 q

D. 20 q

Solution:

636. For high efficiency of transfer of power, internal resistance of the source should be

A. equal to the load resistance

B. less than the load resistance

C. more than the load resistance

D. none of the above

Solution:

637. Efficiency of power transfer when maximum transfer of power c

A. 100%

B. 80%

C. 75%

D. 50%

Solution:

638. An ideal voltage source should have

A. large value of e.m.f.

B. small value of e.m.f.

C. zero source resistance

D. infinite source resistance

Solution:

639. For maximum transfer of power, internal resistance of the source should be

B. less than the load resistance

C. greater than the load resistance

D. none of the above

Solution:

640. If the energy is supplied from a source, whose resistance is 1 ohm, to a load of 100 ohms the source will be

A. a voltage source

B. a current source

C. both of above

D. none of the above

Solution:

641. The circuit whose properties are same in either direction is known as

A. unilateral circuit

B. bilateral circuit

C. irreversible circuit

D. reversible circuit

Solution:

642. In a series parallel circuit, any two resistances in the same current path must be in

A. series with each other

B. parallel with each other

C. series with the voltage source.

D. parallel with the voltage source

Solution:

643. The circuit has resistors, capacitors and semi-conductor diodes. The circuit will be known as

A. non-linear circuit

B. linear circuit

C. bilateral circuit

D. none of the above

Solution:

644. A non-linear network does not satisfy

A. superposition condition

B. homogeneity condition

C. both homogeneity as well as superposition condition

D. homogeneity, superposition and associative condition

Solution:

645. An ideal voltage source has

A. zero internal resistance

B. open circuit voltage equal to the voltage on full load

C. terminal voltage in proportion to current

D. terminal voltage in proportion to load

Solution:

646. A network which contains one or more than one source of e.m.f. is known as

A. linear network

B. non-linear network

C. passive network

D. active network

Solution:

647. The superposition theorem is applicable to

A. linear, non-linear and time variant responses

B. linear and non- linear resistors only

C. linear responses only

D. none of the above

Solution:

648. Application of Norton’s theorem to a circuit yields

A. equivalent current source and impedance in series

B. equivalent current source and impedance in parallel

C. equivalent impedance

D. equivalent current source

Solution:

649. Mill man’s theorem yields

A. equivalent resistance

B. equivalent impedance

C. equivalent voltage source

D. equivalent voltage or current source

Solution:

650. The superposition theorem is applicable to

A. voltage only

B. current “only

C. both current and voltage

D. current voltage and power

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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