Q. In which logic family would you expect to find the lowest propagation delay?
-
A.
TTL
-
B.
CMOS
-
C.
ECL
-
D.
BiCMOS
Solution
ECL has the lowest propagation delay among common logic families due to its design that allows for faster switching.
Correct Answer:
C
— ECL
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Q. In which logic family would you find the term 'fast' commonly associated?
-
A.
TTL
-
B.
CMOS
-
C.
ECL
-
D.
BiCMOS
Solution
The term 'fast' is often associated with ECL, which is designed for high-speed applications.
Correct Answer:
C
— ECL
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Q. In which logic family would you typically find a Schmitt trigger?
-
A.
TTL
-
B.
CMOS
-
C.
ECL
-
D.
BiCMOS
Solution
Schmitt triggers are commonly found in CMOS logic families due to their ability to provide clean transitions.
Correct Answer:
B
— CMOS
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Q. What does the 'LS' in '74LS00' stand for?
-
A.
Low Speed
-
B.
Low Power Schottky
-
C.
Low Signal
-
D.
Logic Standard
Solution
'LS' stands for Low Power Schottky, indicating a specific type of TTL logic family that uses Schottky diodes to improve speed.
Correct Answer:
B
— Low Power Schottky
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Q. What does the term 'fan-out' refer to in digital logic circuits?
-
A.
The number of inputs a gate can drive
-
B.
The number of outputs a gate can have
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C.
The maximum load a gate can handle
-
D.
The distance between gates
Solution
Fan-out refers to the number of inputs that a single output can drive without degrading the signal.
Correct Answer:
A
— The number of inputs a gate can drive
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Q. What is the main disadvantage of using CMOS logic?
-
A.
High power consumption
-
B.
Complex design
-
C.
Susceptibility to noise
-
D.
Slower than TTL
Solution
CMOS logic can be more complex to design due to the need for complementary pairs of transistors.
Correct Answer:
C
— Susceptibility to noise
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Q. What is the main purpose of using pull-up resistors in TTL circuits?
-
A.
To increase speed
-
B.
To ensure a defined logic level
-
C.
To reduce power consumption
-
D.
To improve noise immunity
Solution
Pull-up resistors are used to ensure that inputs are at a defined logic level when not actively driven.
Correct Answer:
B
— To ensure a defined logic level
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Q. What is the primary advantage of CMOS logic over TTL logic?
-
A.
Higher speed
-
B.
Lower power consumption
-
C.
Greater noise immunity
-
D.
Simpler design
Solution
CMOS logic consumes significantly less power than TTL logic, especially when in a static state.
Correct Answer:
B
— Lower power consumption
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Q. What is the primary advantage of CMOS logic over TTL?
-
A.
Higher speed
-
B.
Lower power consumption
-
C.
Greater noise immunity
-
D.
Simpler design
Solution
CMOS logic consumes significantly less power than TTL logic, especially when in a static state.
Correct Answer:
B
— Lower power consumption
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Q. What is the primary function of a buffer in digital circuits?
-
A.
To increase signal strength
-
B.
To decrease signal strength
-
C.
To perform logic operations
-
D.
To store data
Solution
A buffer is used to increase the strength of a signal, allowing it to drive larger loads.
Correct Answer:
A
— To increase signal strength
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Q. What is the primary reason for using BiCMOS technology?
-
A.
Low cost
-
B.
High speed and low power
-
C.
Simplicity
-
D.
High power consumption
Solution
BiCMOS combines the advantages of both bipolar and CMOS technologies, offering high speed and low power consumption.
Correct Answer:
B
— High speed and low power
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Q. What is the typical input impedance of CMOS logic gates?
-
A.
Low
-
B.
Medium
-
C.
High
-
D.
Variable
Solution
CMOS logic gates have a high input impedance, which allows them to draw very little current.
Correct Answer:
C
— High
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Q. What is the typical supply voltage for standard TTL logic circuits?
-
A.
3.3V
-
B.
5V
-
C.
12V
-
D.
15V
Solution
Standard TTL logic circuits typically operate at a supply voltage of 5V.
Correct Answer:
B
— 5V
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Q. What is the typical voltage level for a logic high in TTL logic?
-
A.
0V
-
B.
2.5V
-
C.
5V
-
D.
12V
Solution
In TTL logic, a logic high is typically represented by a voltage level of around 5V.
Correct Answer:
C
— 5V
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Q. Which logic family is best suited for battery-operated devices?
-
A.
TTL
-
B.
CMOS
-
C.
ECL
-
D.
BiCMOS
Solution
CMOS is best suited for battery-operated devices due to its low power consumption.
Correct Answer:
B
— CMOS
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Q. Which logic family is known for its high noise immunity?
-
A.
TTL
-
B.
CMOS
-
C.
ECL
-
D.
BiCMOS
Solution
CMOS logic families are known for their high noise immunity due to their high input impedance.
Correct Answer:
B
— CMOS
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Q. Which logic family is known for its high-speed operation?
-
A.
CMOS
-
B.
TTL
-
C.
ECL
-
D.
BiCMOS
Solution
ECL (Emitter Coupled Logic) is known for its high-speed operation, making it suitable for fast applications.
Correct Answer:
C
— ECL
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Q. Which of the following is a characteristic of TTL logic families?
-
A.
High input impedance
-
B.
Low power consumption
-
C.
Faster switching speeds
-
D.
Higher power consumption
Solution
TTL logic families typically have higher power consumption compared to CMOS due to their design.
Correct Answer:
D
— Higher power consumption
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Q. Which of the following is a disadvantage of CMOS technology?
-
A.
Higher power consumption
-
B.
Slower speed
-
C.
More complex fabrication
-
D.
Susceptibility to noise
Solution
CMOS technology can be more complex to fabricate due to the need for multiple doping processes.
Correct Answer:
C
— More complex fabrication
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Q. Which of the following is a feature of ECL (Emitter Coupled Logic)?
-
A.
Low power consumption
-
B.
High speed
-
C.
High noise margin
-
D.
Low cost
Solution
ECL is known for its high speed, making it suitable for high-frequency applications.
Correct Answer:
B
— High speed
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