Gibilisco - Integrated Circuits

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• 1.

Because of the small size of ICs compared with equivalent circuits made from discretecomponents,

• A.

More heat is generated.

• B.

Higher power output is possible.

• C.

Higher switching speeds are attainable.

• D.

Fewer calculations need to be done per unit time.

C. Higher switching speeds are attainable.
Explanation
The correct answer is "higher switching speeds are attainable." This is because ICs (integrated circuits) are made up of multiple components and circuits that are integrated onto a single chip. Due to their compact size and close proximity, the electrical signals can travel shorter distances, resulting in faster switching speeds. Additionally, the reduced parasitic capacitance and inductance in ICs also contribute to the higher attainable switching speeds.

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• 2.

Which of the following is not an advantage of ICs over discrete components?

• A.

Higher component density

• B.

Ease of maintenance

• C.

Lower gain

• D.

Lower current consumption

C. Lower gain
Explanation
The correct answer is "Lower gain". This means that one disadvantage of ICs compared to discrete components is that they generally have lower gain. In other words, ICs may not amplify signals as effectively as discrete components. This can be a limitation in certain applications where high gain is required. However, ICs still offer advantages such as higher component density, ease of maintenance, and lower current consumption, making them popular in many electronic devices.

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• 3.

In which of the following devices would you never find an IC as the main component?

• A.

• B.

The microprocessor in a personal computer

• C.

A battery-powered calculator

• D.

A low-power audio amplifier

Explanation
In a large radio broadcast transmitter, the final amplifier is responsible for amplifying the signal before it is transmitted. This amplifier needs to handle high power levels, which is not suitable for an integrated circuit (IC) as it would not be able to handle the power requirements. Therefore, an IC would never be found as the main component in the final amplifier of a large radio broadcast transmitter.

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• 4.

Which, if any, of the following component types is not practical for direct fabrication on achip?

• A.

Resistors

• B.

Capacitors

• C.

Diodes

• D.

All three of the above component types are practical for direct fabrication on a chip.

D. All three of the above component types are practical for direct fabrication on a chip.
Explanation
All three component types (resistors, capacitors, and diodes) are practical for direct fabrication on a chip. This means that all three can be manufactured directly on the chip during the fabrication process, without the need for separate assembly or integration. This is possible due to advancements in microfabrication techniques and materials, allowing for the miniaturization and integration of various electronic components onto a single chip. Therefore, all three component types can be conveniently and efficiently incorporated into chip designs.

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• 5.

An op amp circuit usually employs negative feedback to

• A.

Maximize the gain.

• B.

Control the gain.

• C.

Allow oscillation over a wide band of frequencies.

• D.

Forget it! Op amp circuits never have negative feedback.

B. Control the gain.
Explanation
An op amp circuit usually employs negative feedback to control the gain. Negative feedback is a technique used to stabilize and regulate the output of an amplifier by feeding a portion of the output signal back to the input in a phase-inverted manner. By adjusting the amount of feedback, the gain of the op amp circuit can be controlled and maintained at a desired level. This helps in achieving stability, reducing distortion, and improving the overall performance of the circuit.

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• 6.

Suppose a communications channel carries several signals at once. Which type of IC might be used to single one of the signals out for reception?

• A.

An op amp

• B.

A timer

• C.

A comparator

• D.

A multiplexer/demultiplexer

D. A multiplexer/demultiplexer
Explanation
A multiplexer/demultiplexer is used to combine multiple signals into one channel for transmission or separate a single signal from multiple channels for reception. In this scenario, where several signals are being carried on a communications channel, a multiplexer/demultiplexer would be the appropriate choice to single out one specific signal for reception. It allows for the efficient and organized transfer of signals, ensuring that the desired signal is isolated and received accurately.

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• 7.

Which type of IC is commonly used to determine whether two dc voltages are the same ordifferent?

• A.

An op amp

• B.

A timer

• C.

A comparator

• D.

A multiplexer/demultiplexer

C. A comparator
Explanation
A comparator is commonly used to determine whether two DC voltages are the same or different. A comparator is an electronic circuit that compares two voltage inputs and outputs a digital signal indicating which input is larger. It can be used to compare the voltages and determine if they are equal or not. Comparators are widely used in various applications such as in voltage level detection, signal conditioning, and control systems.

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• 8.

Which type of digital IC is least susceptible to noise?

• A.

Transistor-transistor logic

• B.

Base-coupled logic

• C.

Emitter-coupled logic

• D.

N-channel-coupled logic

A. Transistor-transistor logic
Explanation
Transistor-transistor logic (TTL) is the correct answer because it is designed to have a high noise immunity. TTL uses a current-mode logic, where the output current is directly controlled by the input voltage levels. This design allows for better noise rejection compared to other types of digital ICs. Base-coupled logic, emitter-coupled logic, and N-channel-coupled logic are not specifically designed to minimize noise, making them more susceptible to noise interference.

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• 9.

Which of the following is not a characteristic of CMOS chips?

• A.

Sensitivity to damage by electrostatic discharge

• B.

Low current demand

• C.

Ability to work at high speed

• D.

Ability to handle extremely high power

D. Ability to handle extremely high power
Explanation
CMOS chips are known for their low power consumption, making them suitable for portable devices and battery-powered applications. They are also sensitive to damage by electrostatic discharge, which means they can be easily damaged by static electricity. Additionally, CMOS chips are able to work at high speeds, allowing for fast data processing. However, they are not designed to handle extremely high power levels, as this can cause overheating and damage to the chip. Therefore, the ability to handle extremely high power is not a characteristic of CMOS chips.

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• 10.

An absolute limit to the component density that can be achieved in IC technology isdetermined by

• A.

The maximum current levels needed.

• B.

The maximum attainable impedance.

• C.

The size of the semiconductor atoms.

• D.

Forget it! There is no limit to the component density that can be achieved in IC technology.

C. The size of the semiconductor atoms.
Explanation
The correct answer is "the size of the semiconductor atoms." The size of the semiconductor atoms determines the minimum feature size that can be achieved in integrated circuit (IC) technology. As the size of the atoms decreases, the components can be packed more densely onto the IC, allowing for higher component density. This is because smaller atoms allow for smaller transistors and other components to be fabricated, leading to increased functionality and performance in ICs.

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• 11.

With a ROM chip,

• A.

It is easier to read data from the device than to write data into it.

• B.

It is more difficult to read data from the device than to write data into it.

• C.

It is easy to read data from the device, and just as easy to write data into it.

• D.

It is difficult to read data from the device, and equally difficult to write data into it.

A. It is easier to read data from the device than to write data into it.
Explanation
ROM stands for Read-Only Memory, which means that it is designed to store data that can only be read and not modified or written into. The data in a ROM chip is permanently programmed during manufacturing and cannot be changed or erased by the user. Therefore, it is easier to read data from a ROM chip because it is already stored and readily available, while writing data into it would require special programming equipment and processes.

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• 12.

With a RAM chip,

• A.

It is easier to read data from the device than to write data into it.

• B.

It is more difficult to read data from the device than to write data into it.

• C.

It is easy to read data from the device, and just as easy to write data into it.

• D.

It is difficult to read data from the device, and equally difficult to write data into it.

C. It is easy to read data from the device, and just as easy to write data into it.
Explanation
RAM (Random Access Memory) is a type of computer memory that allows for quick and easy access to data. It is designed to be both easy to read data from and easy to write data into. This is because RAM uses electronic circuits to store and retrieve data, which allows for fast and efficient data access. Therefore, it is easy to read data from a RAM chip and just as easy to write data into it.

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• 13.

Which type of IC must be physically removed from the circuit to have its memory contentschanged?

• A.

An EEPROM chip

• B.

An EPROM chip

• C.

An SRAM chip

• D.

A DRAM chip

B. An EPROM chip
Explanation
An EPROM chip must be physically removed from the circuit to have its memory contents changed because it uses a special type of memory that can be erased and reprogrammed only through exposure to ultraviolet light. Once the EPROM chip is removed from the circuit, it can be placed under a UV light source to erase its memory contents, and then reprogrammed with new data. Unlike other types of memory chips, such as EEPROM, SRAM, and DRAM, which can be electronically erased and reprogrammed while remaining in the circuit, an EPROM chip requires physical removal for memory changes.

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• 14.

With respect to memory, which of the following terms means that the data contents vanish ifpower is removed from a chip?

• A.

Volatility

• B.

Component density

• C.

Multiplexing

• D.

Corruptibility

A. Volatility
Explanation
Volatility refers to the property of memory where the data contents are lost or erased when power is removed from a chip. This means that the information stored in the memory will not be retained once the power source is disconnected. Therefore, the correct answer is volatility.

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• 15.

In terms of the maximum number of transistors on a single chip, how many orders ofmagnitude larger is VLSI than MSI?

• A.

Two

• B.

Three

• C.

Four

• D.

Forget it! The maximum number of transistors on a VLSI chip is not larger, but smaller than the maximum number of transistors on an MSI chip.

C. Four
Explanation
VLSI stands for Very Large Scale Integration, which refers to the technology of creating integrated circuits with a large number of transistors on a single chip. MSI stands for Medium Scale Integration, which refers to the technology of creating integrated circuits with a moderate number of transistors on a single chip. The question asks for the number of orders of magnitude larger VLSI is compared to MSI. An order of magnitude is a factor of 10. Since VLSI has a significantly larger number of transistors than MSI, the correct answer is Four.

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• 16.

Flip-flops are used to store data in

• A.

Timers.

• B.

Op amps.

• C.

Multiplexers.

• D.

None of the above.

D. None of the above.
Explanation
Flip-flops are not specifically used to store data in timers, op amps, or multiplexers. Flip-flops are sequential logic circuits that can be used to store a single bit of information, typically in digital systems, and are commonly used in applications such as registers, counters, and memory units. Therefore, the correct answer is "none of the above" as none of the options provided accurately describe the purpose of flip-flops.

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• 17.

Capacitors are used to store data in

• A.

Timers.

• B.

Op amps.

• C.

Multiplexers.

• D.

None of the above.

D. None of the above.
Explanation
Capacitors are not used to store data in timers, op amps, or multiplexers. Capacitors are passive electronic components that store and release electrical energy in the form of an electric field. They are commonly used in electronic circuits for various purposes such as filtering, smoothing, coupling, and energy storage. However, they are not specifically used for data storage in any of the mentioned devices. Therefore, the correct answer is "none of the above."

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• 18.

The phase of a sine wave signal can be shifted 180° by

• A.

Applying the signal to the input of a timer.

• B.

Applying the signal to the inverting input of an op amp.

• C.

Applying the signal to the input of a flip-flop.

• D.

Applying the signal to the input of an SRAM chip.

B. Applying the signal to the inverting input of an op amp.
Explanation
By applying the signal to the inverting input of an op amp, the phase of the sine wave signal can be shifted 180°. This is because the inverting input of an op amp produces an output that is the opposite polarity of the input signal. Thus, when the input signal is positive, the output will be negative, and vice versa. This results in a 180° phase shift in the signal.

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• Current Version
• Aug 25, 2023
Quiz Edited by
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• Dec 07, 2010
Quiz Created by
BATANGMAGALING

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