Q. In which logic family is the output state determined by the input states without any delay?
-
A.
TTL
-
B.
CMOS
-
C.
Static Logic
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D.
Dynamic Logic
Solution
Static Logic families provide output states that are determined by input states without any delay.
Correct Answer:
C
— Static Logic
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Q. What does ECL stand for in logic families?
-
A.
Emitter-Coupled Logic
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B.
Emitter-Common Logic
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C.
Enhanced-Coupled Logic
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D.
Electro-Coupled Logic
Solution
ECL stands for Emitter-Coupled Logic, which is known for its high speed but also has higher power consumption.
Correct Answer:
A
— Emitter-Coupled Logic
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Q. What does the term 'fan-out' refer to in digital logic?
-
A.
The number of inputs a gate can drive
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B.
The number of outputs a gate can have
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C.
The maximum load a gate can handle
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D.
The number of gates in a circuit
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 a disadvantage of TTL logic families?
-
A.
High power consumption
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B.
Low noise immunity
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C.
High cost
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D.
Low speed
Solution
TTL logic families generally have higher power consumption compared to CMOS, making them less suitable for low-power applications.
Correct Answer:
A
— High power consumption
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Q. What is a disadvantage of using CMOS logic?
-
A.
High power consumption
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B.
Slow switching speed
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C.
Susceptibility to noise
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D.
Complex fabrication process
Solution
CMOS technology can be complex to fabricate due to the need for both n-type and p-type transistors.
Correct Answer:
D
— Complex fabrication process
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Q. What is the main advantage of BiCMOS logic?
-
A.
High speed and low power
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B.
Low cost
-
C.
Simplicity
-
D.
High noise margin
Solution
BiCMOS combines the advantages of both bipolar and CMOS technologies, offering high speed and low power consumption.
Correct Answer:
A
— High speed and low power
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Q. What is the main advantage of BiCMOS over standard CMOS?
-
A.
Higher speed
-
B.
Lower cost
-
C.
Lower power consumption
-
D.
Simpler design
Solution
BiCMOS combines the high speed of bipolar transistors with the low power consumption of CMOS, providing a significant speed advantage.
Correct Answer:
A
— Higher speed
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Q. What is the main advantage of ECL over TTL?
-
A.
Lower power consumption
-
B.
Higher speed
-
C.
Higher noise margin
-
D.
Lower cost
Solution
ECL (Emitter-Coupled Logic) is faster than TTL due to its unique design that allows for quicker signal transitions.
Correct Answer:
B
— Higher speed
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Q. What is the primary characteristic of TTL logic families?
-
A.
High speed and low power consumption
-
B.
Low speed and high power consumption
-
C.
High speed and moderate power consumption
-
D.
Low speed and low power consumption
Solution
TTL (Transistor-Transistor Logic) is known for its high speed and moderate power consumption compared to other logic families.
Correct Answer:
C
— High speed and moderate power consumption
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Q. What is the typical input impedance of a CMOS gate?
-
A.
Low
-
B.
Medium
-
C.
High
-
D.
Variable
Solution
CMOS gates have a high input impedance, which allows them to draw very little current from the input signal.
Correct Answer:
C
— High
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Q. What is the typical output voltage level for a logic high in TTL?
-
A.
0V
-
B.
2.5V
-
C.
5V
-
D.
12V
Solution
In TTL logic families, the typical output voltage level for a logic high is around 5V.
Correct Answer:
C
— 5V
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Q. Which logic family has the fastest propagation delay?
-
A.
TTL
-
B.
CMOS
-
C.
ECL
-
D.
BiCMOS
Solution
ECL (Emitter-Coupled Logic) has the fastest propagation delay among common logic families.
Correct Answer:
C
— ECL
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Q. Which logic family has the highest noise margin?
-
A.
TTL
-
B.
CMOS
-
C.
ECL
-
D.
BiCMOS
Solution
CMOS logic families typically have the highest noise margin, making them more robust against noise.
Correct Answer:
B
— CMOS
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Q. Which logic family is best suited for high-speed applications?
-
A.
TTL
-
B.
CMOS
-
C.
ECL
-
D.
DIP
Solution
ECL (Emitter-Coupled Logic) is best suited for high-speed applications due to its fast switching capabilities.
Correct Answer:
C
— ECL
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Q. Which logic family is known for its low power consumption?
-
A.
CMOS
-
B.
TTL
-
C.
ECL
-
D.
BiCMOS
Solution
CMOS (Complementary Metal-Oxide-Semiconductor) logic families are recognized for their low power consumption, especially in static conditions.
Correct Answer:
A
— CMOS
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Q. Which logic family is most susceptible to noise?
-
A.
TTL
-
B.
CMOS
-
C.
ECL
-
D.
DIP
Solution
CMOS logic families are more susceptible to noise compared to TTL due to their high input impedance.
Correct Answer:
B
— CMOS
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Q. Which logic family is typically used in high-speed applications?
-
A.
TTL
-
B.
CMOS
-
C.
ECL
-
D.
DIP
Solution
ECL (Emitter-Coupled Logic) is favored in high-speed applications due to its fast switching capabilities.
Correct Answer:
C
— ECL
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Q. Which logic family typically has the highest noise margin?
-
A.
TTL
-
B.
CMOS
-
C.
ECL
-
D.
BiCMOS
Solution
CMOS logic families generally have a higher noise margin compared to TTL and ECL, making them more robust in noisy environments.
Correct Answer:
B
— CMOS
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Q. Which of the following is a characteristic of CMOS technology?
-
A.
It is faster than TTL
-
B.
It can operate at lower voltages
-
C.
It consumes more power than TTL
-
D.
It is less noise tolerant than TTL
Solution
CMOS technology can operate at lower voltages, making it suitable for battery-powered devices.
Correct Answer:
B
— It can operate at lower voltages
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