This set of Microelectronics Multiple Choice Questions & Answers (MCQs) focuses on “Microelectronics Basics”.
1. Choose from the following where Microelectronics has invaded since its birth.
a) All systems
b) All electronic systems
c) Only military electronic systems
d) All household and military electronic systems
View Answer
Explanation: The presence of microelectronics systems has led to the digital revolution in the world. Ever since the advent of microchip technology, such systems have risen and play a dominant role in the present world. They are present from cameras to toothbrushes, mobile phones to computers, the military, satellite communication and many more areas and these areas have become hugely dependent on microelectronic systems for speed, power consumption and noise immunity.
2. For which purpose, digital systems are more suitable?
a) Amplification
b) High voltage applications
c) Memories
d) Audio and Video processing
View Answer
Explanation: Analog systems prove to be more valuable during amplification and high voltage applications owing to their power handling capacity being more superior than that of digital systems. System representing memories can be realized with digital systems since the loss of memory is highly less in digital systems. Audio and Video processing are typically carried out by analog systems while image processing is better done in digital systems.
3. Which effect is the bottleneck of speed in microelectronic systems?
a) Capacitive
b) Inductive
c) Resistive
d) Power supply
View Answer
Explanation: Capacitive effects get manifested in microelectronic devices which significantly limit the speed of such systems. The resistive effect leads to power dissipation while power supply would limit the effective working time and high-power applications.
4. What kind of devices are used to model an active device?
a) Passive devices
b) Active devices
c) Passive and Active devices
d) Only dependent sources
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Explanation: An active device such as a Transistor is modelled using both passive and active devices. This allows us to have a circuit view of the device and use circuit laws to derive characteristics of the circuit involved with the device.
5. Which systems requires a good bandwidth?
a) Analog
b) Digital
c) Analog and Digital Systems
d) A good bandwidth is always absent
View Answer
Explanation: Digital systems have been seen to require more bandwidth than analog systems. This is seen in analog signal processing.
6. Reducing the size of the MOS leads to ___________
a) Short Channel effects
b) Long Channel effects
c) Less amplification
d) Less speed
View Answer
Explanation: If the device size decreases, speed would increase and amplification doesn’t get hampered heavily. Short channel effects crop up which are likely to pose threats to scaling of the devices.
7. Microprocessor is a ____________
a) Microelectronic system
b) Electrical system
c) Digital system
d) Microelectronic Device
View Answer
Explanation: It is not simply a digital system since it is prone to use microelectronic circuits and not simply logic gates. It would contain oscillators, filters and many other devices apart from the digital system. Microprocessors are kind of CPU which form a part of the Microelectronic System.
8. It is always found that the output voltage is linearly related to the ______________
a) Input voltage
b) Input current
c) Power supply
d) Temperature
View Answer
Explanation: The output voltage can vary non-linearly with the input voltage, current and the surrounding temperature. We find that B.J.T. goes into thermal runaway, the output voltage is related exponentially with the input voltage. But the output voltage is directly related to the power supply and increases linearly from a certain offset.
9. Relays are less effective than Transistors for switching factors.
a) True
b) False
View Answer
Explanation: It has been seen that the birth of the transistor paved the way for efficient switching systems than relays. Switching systems are inherent to communication systems which saw large improvement due to the transistor.
10. What does high loading imply?
a) Low current drawn
b) High current drawn
c) High voltage
d) Low voltage
View Answer
Explanation: High loading implies than the load offers a load impedance and draws more current. This in turn implies that it consumes more power.
11. Which of the following can be used to represent the output of a transconductance amplifier?
a) Thevenin’s equivalent
b) Norton’s equivalent
c) Tellegen’s equivalent
d) Schottky equivalent
View Answer
Explanation: The output of a transconductance amplifier is denoted as a current. Hence, it would be preferable to represent the output by a Norton’s equivalent to denote the output current and the output impedance.
12. Which of the following can be used to represent the input of a transconductance amplifier?
a) Thevenin’s equivalent
b) Tellegen’s equivalent
c) Norton’s equivalent
d) Schottky equivalent
View Answer
Explanation: The trans-resistance amplifier converts current to voltage. The input side should be represented by a Norton’s equivalent to represent the input current and the input impedance.
13. What does a gain of 100dB imply?
a) Multiplied by a factor of 5
b) Divided by a factor of 5
c) Multiplied by a factor of 20
d) Divided by a factor of 4
View Answer
Explanation: 20 log (gain) is used to represent any kind of gain in Decibels or dB. Hence a gain of 100dB translated to multiplication by a factor of 5.
14. If RS is the internal resistance and RL is the load applied across it, which relation is satisfied by a stiff current source?
a) RS > 100 RL
b) RS >= 100 RL
c) RS = 100 RL
d) RS < 100 RL
View Answer
Explanation: A stiff current source suggest that the internal resistance of the source can be neglected in circuit representation. This is satisfied by RS > 100 RL while RS = 100 RL is treated as the worst case. If the load resistance increases to a certain extent, the internal resistance manifests itself by degrading the source.
15. If RS is the internal resistance and RL is the load applied across it, which relation is satisfied by a stiff voltage source?
a) RS < .01RL
b) RS = .01RL
c) RS > .01RL
d) RS <= .01RL
View Answer
Explanation: A stiff voltage source offers 0 input impedance and the entire voltage gets dropped across the load. This is satisfied if RS < .01RL hold good for voltage sources.
Sanfoundry Global Education & Learning Series – Microelectronics.
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