logo
  • Home
  • Test & Rank
  • About
  • Training
  • Programming
  • CS
  • IT
  • IS
  • ECE
  • EEE
  • EE
  • Civil
  • Mechanical
  • Chemical
  • Metallurgy
  • Instrumentation
  • Aeronautical
  • Aerospace
  • Biotechnology
  • Mining
  • Marine
  • Agriculture
  • MCA
  • BCA
  • Internship
  • Jobs
  • Contact

Electronic Devices Multiple Choice Questions | MCQs | Quiz

Electronic Devices and Circuits Interview Questions and Answers
Practice Electronic Devices and Circuits questions and answers for interviews, campus placements, online tests, aptitude tests, quizzes and competitive exams.

Get Started

•   Basic Concepts
•   Analysis Method
•   Frequency Response - 1
•   Frequency Response - 2
•   Two Port Network
•   Continous Time Signals
•   Random Process
•   Noise
•   Amplitde Modulation
•   Digital Transmission
•   Semicondunctor Physics
•   Network Theroms
•   S Domain Circuit Analysis
•   Magneticaly Coupled Circuit
•   Semiconductor Electrons
•   Semiconductor Conductivity
•   Donor & Acceptor Impurities
•   Semiconductor Impurities
•   Fermi Level Impurities
•   Diffusion
•   Carrier Life Time
•   Continuity Equation
•   Hall Effect
•   P-N Qualitative Theory
•   P-N Junction Diode
•   P-N Band Structure
•   P-N Junction Components
•   P-N Diode Currents
•   Volt Ampere Characteristics
•   P-N Characteristics
•   Diode Resistance
•   Diode Capacitances
•   PN Diode Switching Times
•   Breakdown Diodes
•   Tunnel Diodes
•   PIN Diode & Characteristics
•   Point Contact Diode
•   Ideal Diode
•   Diode Characteristics
•   Zener Diode
•   Rectifiers
•   Clamping Circuits
•   Diode Circuits
•   Half-Wave Rectifier
•   Full-wave Rectifier
•   Bridge Rectifier
•   Rectifier Voltmeter
•   Inductor Filters
•   Capacitor Filters
•   L-Section Filter
•   CLC Filter
•   Voltage Regulation
•   Junction Transistor
•   Transistor - Amplifier
•   Transistor Construction
•   ↓ Configurations ↓
•   Common Base
•   Common Emitter
•   Common Collector
•   CE Characteristics
•   CB Characteristics
•   DC Load Lines
•   Transistor - Switch
•   Transistor Switching Times
•   Operating Point
•   Bias Stability
•   Collector - Base Bias
•   Emitter Feedback Bias
•   Self-Bias
•   Bias Compensation
•   Thermistor Compensation
•   Thermal Runaway
•   Thermal Stability
•   Signals
•   Amplifiers
•   Amplifier Circuit Models
•   Amplifier Frequency
•   Sinusoidal Steady State
•   Ideal Operational Amplifiers
•   Inverting Configuration
•   Non Inverting Configuration
•   Difference Amplifiers
•   Integrators & Differentiators
•   Operational Amplifiers
•   Circuit Perfomance
•   Signal Operations
•   MOSFET Strucutures
•   MOSFET Characterisitcs
•   MOSFET DC Circuits
•   MOSFET Amplfier Design
•   MOSFET Signal Operation
•   MOSFET Configurations
•   MOS Amplifier Circuit
•   Discrete Circuit Amplifiers
•   Body Effect
•   BJT Device Strucutres
•   BJT Characteristics
•   BJT DC Circuits
•   BJT Amplifier Design
•   Signal Operations & Model
•   BJT Configuration
•   BJT Amplifier Circuits
•   Spread Spectrum
•   Transistor AC Analysis
•   Biasing Parameters
•   AC & DC Analysis Problem
•   Transistor Hybrid Model
•   Transistor Amplifier
•   JFET - 1
•   JFET - 2
•   Pinch off Voltage Vp
•   JFET Volt Characteristics
•   FET Small Signal Model
•   Insulated Gate FET - 1
•   Insulated Gate FET - 2
•   Common-Source Amplifier
•   Common-Drain Amplifier
•   FET Biasing
•   Generalized FET Amplifier
•   Class A Signal Amplifiers
•   CE Amplifier - Resistance
•   Frequency Compensation
•   Input Bias-Bipolar Amplifier
•   Multistage Amplifier
•   Negative Feedback Property
•   Voltage Amplifiers
•   Tranconductance Amplifiers
•   Output Stage Classification
•   Class A output Stage
•   Class B Output Stage
•   Power BJTs
•   Transistor case
•   Class B Amplifiers
•   Class D Amplifiers
•   Oscillators - 1
•   Oscillators - 2

Best Reference Books

Electronic Devices and Circuits Books

« Prev Page
Next Page »

Electronic Devices and Circuits Questions and Answers – Transistor as a Switch

Posted on February 23, 2018 by staff10

This set of Electronic Devices and Circuits Multiple Choice Questions & Answers (MCQs) focuses on “Transistor as a Switch”.

1. In which region a transistor acts as an open switch?
a) cut off region
b) inverted region
c) active region
d) saturated region
View Answer

Answer: a
Explanation: In this mode, both the junctions are reverse biased. The transistor has practically zero current because the emitter does not emit charge carriers to the base. There is negligibility current due to minority carriers. In this mode the transistor acts as an open switch.
advertisement

2. In which region a transistor acts as a closed switch?
a) cut off region
b) inverted region
c) active region
d) saturated region
View Answer

Answer: d
Explanation: In this mode, both the junctions are forward biased. The negative terminal of the battery is connected to the emitter. The collector current becomes independent of base current. In this mode the transistor acts as a closed switch.

3. Which of the following circuits act as a switch?
a)electronic-devices-circuits-questions-answers-transistor-switch-q3
b)electronic-devices-circuits-questions-answers-transistor-switch-q3a
c)electronic-devices-circuits-questions-answers-transistor-switch-q3b
d)electronic-devices-circuits-questions-answers-transistor-switch-q3c
View Answer

Answer: b
Explanation: This is an inverter, in which the transistor in the circuit is switched between cut off and saturation. The load, for example, can be a motor or a light emitting diode or any other electrical device.

4. The current which is helpful for LED to turn on is_________
a) emitter current
b) base current
c) collector current
d) depends on bias
View Answer

Answer: c
Explanation: Depending on the type of load, a collector current is induced that would turn on the motor or LED. The transistor in the circuit is switched between cut off and saturation. The load, for example, can be a motor or a light emitting diode or any other electrical device.

5. Which of the following statements is true?
a) Solid state switches are applications for an AC output
b) LED’s can be driven by transistor logics
c) Only NPN transistor can be used as a switch
d) Transistor operates as a switch only in active region
View Answer

Answer: b
Explanation: Output devices like LED’s only require a few milliamps at logic level DC voltages and can therefore be driven directly by the output of a logic gate. However, high power devices such as motors or lamps require more power than that supplied by an ordinary logic gate so transistor switches are used.
advertisement

6. The base emitter voltage in a cut off region is_________
a) greater than 0.7V
b) equal to 0.7V
c) less than 0.7V
d) cannot be predicted
View Answer

Answer: c
Explanation: From the cut off characteristics, the base emitter voltage (VBE) in a cut off region is less than 0.7V. The cut off region can be considered as ‘off mode’. Here, VBE > 0.7 and IC=0. For a PNP transistor, the emitter potential must be negative with respect to the base.

7. In saturation region, the depletion layer_________
a) increases linearly with carrier concentration
b) decreases linearly with carrier concentration
c) increases by increasing the emitter current
d) decreases by decreasing the emitter voltage drop
View Answer

Answer: d
Explanation: Here, the transistor will be biased so that maximum amount of base current is applied, resulting in maximum collector current resulting in minimum emitter voltage drop which results in depletion layer as small as possible and maximum current flows through the transistor.

8. The base emitter voltage in a saturation region is_________
a) greater than 0.7V
b) equal to 0.7V
c) less than 0.7V
d) cannot be predicted
View Answer

Answer: d
Explanation: From the saturation mode characteristics, the transistor acts as a single pole single throw solid state switch. A zero collector current flows. With a positive signal applied to the base of transistor it turns on like a closed switch.

9. The switching of power with a PNP transistor is called_________
a) sourcing current
b) sinking current
c) forward sourcing
d) reverse sinking
View Answer

Answer: a
Explanation: Sometimes DC current gain of a bipolar transistor is too low to directly switch the load current or voltage, so multiple switching transistors is used. The load is connected to ground and the transistor switches the power to it.

10. The switching of power with a NPN transistor is called_________
a) sourcing current
b) sinking current
c) forward sourcing
d) reverse sinking
View Answer

Answer: b
Explanation: Sometimes DC current gain of a bipolar transistor is too low to directly switch the load current or voltage, so multiple switching transistors is used. The load is connected to supply and the transistor switches the power to it.
advertisement

Sanfoundry Global Education & Learning Series – Electronic Devices and Circuits.

To practice all areas of Electronic Devices and Circuits, here is complete set of 1000+ Multiple Choice Questions and Answers.

« Prev Page - Electronic Devices and Circuits Questions and Answers – DC Load Lines
» Next Page - Electronic Devices and Circuits Questions and Answers – Transistor Switching Times

« Electronic Devices and Circuits Questions and Answers – DC Load Lines
Electronic Devices and Circuits Questions and Answers – Transistor Switching Times »
advertisement

Deep Dive @ Sanfoundry:

  1. Transformers Questions and Answers
  2. Microwave Engineering Questions and Answers
  3. VLSI Questions and Answers
  4. Electrical Measurements Questions and Answers
  5. Power Electronics Questions and Answers
  6. Electric Circuits Questions and Answers
  7. Linear Integrated Circuits Questions and Answers
  8. Digital Circuits Questions and Answers
  9. Analog Circuits Questions and Answers
  10. Electronic Devices and Circuits Questions and Answers
Manish Bhojasia
Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He is Linux Kernel Developer & SAN Architect and is passionate about competency developments in these areas. He lives in Bangalore and delivers focused training sessions to IT professionals in Linux Kernel, Linux Debugging, Linux Device Drivers, Linux Networking, Linux Storage, Advanced C Programming, SAN Storage Technologies, SCSI Internals & Storage Protocols such as iSCSI & Fiber Channel. Stay connected with him @ LinkedIn | Facebook | Twitter

Best Careers

Developer Tracks
SAN Developer
Linux Kernel Developer
Linux Driver Developer
Linux Network Developer

Live Training Photos
Mentoring
Software Productivity
GDB Assignment
Sanfoundry is No. 1 choice for Deep Hands-ON Trainings in SAN, Linux & C, Kernel Programming. Our Founder has trained employees of almost all Top Companies in India such as VMware, Citrix, Oracle, Motorola, Ericsson, Aricent, HP, Intuit, Microsoft, Cisco, SAP Labs, Siemens, Symantec, Redhat, Chelsio, Cavium, ST-Micro, Samsung, LG-Soft, Wipro, TCS, HCL, IBM, Accenture, HSBC, Mphasis, Tata-Elxsi, Tata VSNL, Mindtree, Cognizant and Startups.

Best Trainings

SAN I - Technology
SAN II - Admin
Linux Fundamentals
Advanced C Training
Linux-C Debugging
System Programming
Network Programming
Linux Threads
Kernel Programming
Kernel Debugging
Linux Device Drivers

Best Reference Books

Computer Science Books
Algorithm & Programming Books
Electronics Engineering Books
Electrical Engineering Books
Chemical Engineering Books
Civil Engineering Books
Mechanical Engineering Books
Industrial Engineering Books
Instrumentation Engg Books
Metallurgical Engineering Books
All Stream Best Books

Questions and Answers

1000 C Questions & Answers
1000 C++ Questions & Answers
1000 C# Questions & Answers
1000 Java Questions & Answers
1000 Linux Questions & Answers
1000 Python Questions
1000 PHP Questions & Answers
1000 Hadoop Questions
Cloud Computing Questions
Computer Science Questions
All Stream Questions & Answers

India Internships

Computer Science Internships
Instrumentation Internships
Electronics Internships
Electrical Internships
Mechanical Internships
Industrial Internships
Systems Internships
Chemical Internships
Civil Internships
IT Internships
All Stream Internships

About Sanfoundry

About Us
Copyright
Terms
Privacy Policy
Jobs
Bangalore Training
Online Training
Developers Track
Mentoring Sessions
Contact Us
Sitemap
© 2011 Sanfoundry. All Rights Reserved.