MCQ in Electronic Circuits Part 16 | ECE Board Exam

This is the Multiple Choice Questions in Electronic Circuits (Electronic Devices and Circuits, Electronic Circuit Analysis and Design) Part 16 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 16 of the Series

⇐ MCQ in Electronic Circuits Part 15 | ECE Board Exam

Choose the letter of the best answer in each questions.

751. In a class A transformer-coupled amplifier, the the value of V_CEmax and the the value of V_CEmin, the efficiency to (from) the theoretical limit of 50%.

A. larger, smaller, farther

B. larger, smaller, closer

C. smaller, larger, closer

D. none of the above

752. In class B operation, the current drawn from a single power supply has the form of rectified signal.

A. a full-wave

B. a half-wave

C. both a full-wave and a half-wave

D. none of the above

753. The highest efficiency is obtained in class B operation when the level of VL(p) is equal to .

A. 0.25vcc

B. 0.50vcc

C. vcc

D. 2vcc

754. transistors can be used to build a class B amplifier.

A. NPN and PNP

B. NMOS and PMOS

C. both NPN and PNP or NMOS and PMOS

D. none of the above

755. The complementary Darlington-connected transistor for a class B amplifier provides output current and output resistance.

A. higher, higher

B. higher, lower

C. lower, lower

D. lower, higher

756. The fundamental component is typically any harmonic component.

A. larger than

B. the same as

C. smaller than

D. none of the above

757. In Fourier technique, any periodic distorted waveform can be represented by the fundamental and all harmonic components.

A. multiplying

B. subtracting

C. dividing

D. adding

758. Improvement in production techniques of power transistors have ______.

A. produced higher power ratings in small-sized packaging cases

B. increased the maximum transistor breakdown voltage

C. provided faster- switching power transistors

D. all of the above

759. The greater the power handled by the power transistor, the

A. the higher

B. the lower

C. there is no

D. none of the above

760. The has the hottest temperature in a power transistor.

A. heat sink

B. case

C. junction

D. none of the above

761. A heat sink provides thermal resistance between case and air.

A. a high

B. a low

C. the same

D. none of the above

762. A power amplifier is limited to use at one fixed frequency.

A. class a

B. class b or ab

C. class c

D. class d

763. By how much does the output signal vary for a class AB power amplifier?

A. 360°

B. 180°

C. between 180° and 360°

D. less than 180°

764. Which type of amplifier uses pulse (digital) signals in its operation?

A. class a

B. class b or ab

C. class c

D. class d

765. Which of the power amplifiers has the lowest overall efficiency?

A. class a

B. class b or ab

C. class c

D. class d

766. Which of the following describe(s) a power amplifier?

A. it can handle large power.

B. it can handle large current.

C. it does not provide much voltage gain.

D. all of the above

767. amplifiers primarily provide sufficient power to an output load to drive a speaker from a few watts to tens of watts.

A. small-signal

B. power

C. none of the above

D. all of the above

768. The main features of a large-signal amplifier is the circuit’s ______ .

A. power efficiency

B. maximum power limitations

C. impedance matching to the output device

D. all of the above

769. Categorize the power efficiency of each class of amplifier, from worst to best.

A. a, b, ab, d

B. a, ab, d, b

C. a, ab, b, d

770. What is the ratio of the secondary voltage to the primary voltage with the turn ratio in the winding

A. n2/n1

B. (n1/n2)²

C. (n1/n2)1/3

D. n1 × n2

771. Calculate the effective resistance seen looking into the primary of a 20:1 transformer connected to an 8- Ω load.

A. 3.2 kΩ

B. 3.0 kΩ

C. 2.8 kΩ

D. 1.8 kΩ

772. What transformer turns ratio is required to match an 8-speaker load so that the effective load resistance seen at the primary is 12.8 k?

A. 20:01

B. 40:01:00

C. 50:01:00

D. 60:01:00

773. Calculate the efficiency of a transformer-coupled class A amplifier for a supply of 15 V and an output of V(p) = 10 V.

A. 25%

B. 33.30%

C. 50%

D. 78.50%

774. The maximum efficiency of a transformer-coupled class A amplifier is _____.

A. 25%

B. 50%

C. 78.5%

D. 63.6%

775. How many transistors must be used in a class B power amplifier to obtain the output for the full cycle of the signal?

A. 0

B. 1

C. 2

D. 3

776. Class B operation is provided when the dc bias leaves the transistor biased just off, the transistor turning on when the ac signal is applied.

A. true

B. false

777. Calculate the efficiency of a class B amplifier for a supply voltage of V_CC = 20 V with peak output voltage of V_L(p) = 18 V. Assume R_L = 16 Ω.

A. 78.54%

B. 75%

C. 70.69%

D. 50%

778. Which of the following is (are) the disadvantage(s) of a class B complementary-symmetry circuit?

A. it needs two separate voltage sources.

B. there is crossover distortion in the output signal.

C. it does not provide exact switching of one transistor off and the other on at the zero- voltage condition.

D. all of the above

779. nMOS and pMOS transistors can be used for class B.

A. true

B. false

780. Calculate the harmonic distortion component for an output signal having fundamental amplitude of 3 V and a second harmonic amplitude of 0.25 V.

A. 3.83%

B. 38.3%

C. 83.3%

D. 8.33%

781. Which of the following instruments displays the harmonics of a distorted signal?

A. digital multimeter

B. spectrum analyzer

C. oscilloscope

D. wave analyzer

782. Which of the following instruments allows more precise measurement of the harmonic components of a distorted signal?

A. digital multimeter

B. spectrum analyzer

C. oscilloscope

D. wave analyzer

783. What is the maximum temperature rating for silicon power transistors?

A. 50° to 80°

B. 100° to 110°

C. 150° to 200°

D. 250° to 300°

784. Which of the power amplifiers is not intended primarily for large- signal or power amplification?

A. class a

B. class b or ab

C. class c

D. class d

785. Determine what maximum dissipation will be allowed for a 70-W silicon transistor (rated at 25°C) if derating is required above 25°C by a derating factor of 0.6 W/°C at a case temperature of 100°C.

A. 25 w

B. 30 w

C. 35 w

D. 40 w

786. A silicon power transistor is operated with a heat sink (θ_SA = 1.5°C/W). The transistor, rated at 150 W (25°C), has θ_JC = 0.5°C/W, and the mounting insulation has θ_CS = 0.6 °C/W. What is the maximum power that can be dissipated if the ambient temperature is 50°C and T_Jmax = 200 °C?

A. 61.5 w

B. 60.0 w

C. 57.7 w

D. 55.5 w

787. Which of the following transistors has been quite popular as the driver device for class D amplification?

A. bjt

B. fet

C. ujt

D. mosfet

788. Kirchhoff’s Voltage Law states that the total voltage around a closed loop must be

A. 0

B. ½

C. 1

D. 2

789. The algebraic sum of in a network of conductors meeting at a point is zero.

A. voltages

B. currents

C. resistances

D. inductances

790. The theorem is a way to determine the currents and voltages present in a circuit that has multiple sources.

A. norton

B. super position

C. thevenin

D. maximum power transfer

791. The concept on which Superposition theorem is based is

A. reciprocity

B. duality

C. non-linearity

D. linearity

792. Kirchhoff’s current law is applicable to only

A. junction in a network

B. closed loops in a network

C. electric circuits

D. electronic circuits

793. Kirchhoff’s voltage law is related to

A. junction currents

B. battery emfs

C. ir drops

D. both b & c

794. Superposition theorem can be applied only to circuits having

A. resistive elements

B. passive elements

C. non-linear elements

D. linear bilateral elements

795. The concept on which superposition theorem is based on

A. reciprocity

B. duality

C. non-linearity

D. linearity

796. Node analysis can be applied for

A. planar networks

B. non-planar networks

C. both a & b

D. electric networks

797. Mesh analysis is applicable for

A. planar networks

B. non-planar networks

C. both a & b

D. electric networks

798. The superposition theorem is applicable to

A. voltage only

B. current only

C. current and voltage

D. current, voltage and power

799. Kirchhoff’s current law is applicable only to

A. junction in a network

B. closed loops in a network

C. electric circuits

D. electronic circuits

800. 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

Questions and Answers in Electronic Circuits

Following is the list of practice exam test questions in this brand new series:

Complete List of MCQ in Electronics Engineering per topic