VLSI Design MCQ Multiple Choice Questions Answers for Practice

Q: 1. A common means for comparing the propagation delays and the power dissipation of various logic gates is the

Correct Answer is: speed-power product.

Q: 3. An invalid input voltage for a TTL logic gate would be

Correct Answer is: between 0.8 V and 2.0 V.

Q: 4. An open-collector TTL gate

Correct Answer is: must have an external pull-up resistor to produce a HIGH.

Q: 5. An open-collector TTL gate

Correct Answer is: can sink current but cannot source current.

Q: 8. In order to interface an FPGA with an external device, you must set the value of the

Correct Answer is: all of the above

Q: 9. One advantage that MOSFET transistors have over bipolar transistors is

Correct Answer is: high input impedance.

Q: 10. The 54XX TTL IC series is the military version and has

Correct Answer is: a wider temperature range.

Q: 19. The abbreviation TTL means

Correct Answer is: transistor-transistor logic.

Q: 20. The CMOS series that is pin compatible with the TTL family is the

Correct Answer is: 74C00 series.

1. A common means for comparing the propagation delays and the power dissipation of various logic gates is the

fan-out.
power requirements.
speed-power product.
noise margin.

2. A family of logic devices designed for extremely high speed applications is called

NMOS
ECL
PMOS
TTL

3. An invalid input voltage for a TTL logic gate would be

less than 0.8 V.
greater than 2.0 V but less than 5.0 V.
greater than 2.0 V.
between 0.8 V and 2.0 V.

4. An open-collector TTL gate

must have an external pull-up resistor to produce a LOW.
must have an external pull-up resistor to produce a HIGH.
must have an external ground connected to the output to produce a LOW.
must have a transistor added to the output to produce a HIGH.

5. An open-collector TTL gate

can sink current but cannot source current.
can source current but cannot sink current.
cannot source or sink current.
can sink more current than a standard TTL gate.

6. Each input on a TTL gate is connected to the transistors

base.
collector.
gate.
emitter.

7. Fan-out for a typical TTL gate is

8. In order to interface an FPGA with an external device, you must set the value of the

sink current.
external power supply.
source current.
all of the above

9. One advantage that MOSFET transistors have over bipolar transistors is

reduced propagation delay.
higher switching speed.
high input impedance.
low input impedance.

10. The 54XX TTL IC series is the military version and has

a wider temperature range.
more stringent power supply requirements.
higher current output capability.
all of the above.

11. The abbreviated designation for input current with a HIGH input is

VIH.
IIH.
IIL.
IOL.

12. The abbreviated designation for input current with a LOW input is

VIH.
IIH.
IIL.
IOL.

13. The abbreviated designation for output current with a HIGH output is

IOH.
IIL.
IIH.
IOL.

14. The abbreviated designation for output current with a LOW output is

OOL.
IOL.
IOH.
IIH.

15. The abbreviated designator for a HIGH input voltage is

VOH.
VIH.
VIL.
VOL.

16. The abbreviated designator for a HIGH output voltage is

VIL.
VOH.
VIH.
VOL.

17. The abbreviated designator for a LOW input voltage is

VIL.
VOH.
VOL.
VIH.

18. The abbreviated designator for a LOW output voltage is

VOH.
VIL.
VOL.
VIH.

19. The abbreviation TTL means

transistor-transceiver latch.
three-transistor logic.
two-transistor logic.
transistor-transistor logic.

20. The CMOS series that is pin compatible with the TTL family is the

74C00 series.
4000 series.
5400 series.
7400 series.

21. The difference between VOH and VIH voltages is known as

input margin.
noise margin.
output differential.
input level.

22. The input transistor (Q 1) of a TTL gate acts like

a NAND gate.
a NOR gate.
an AND gate.
an OR gate.

23. The input transistor on a TTL circuit is unusual in that it has

multiple bases.
no collector
no base
multiple emitters.

24. The lower transistor of a totem-pole output is OFF when the gate output is

HIGH.
malfunctioning.
LOW.
over driven.

25. The lower transistor of a totem-pole output is saturated when the gate output is

HIGH.
LOW.
malfunctioning.
over driven.

26. The major advantage of CMOS logic circuits over TTL is

very low power consumption.
the ability to produce several output voltage levels.
lower propagation delay.
much higher propagation delay.

27. The major advantage of TTL logic circuits over CMOS is

lower propagation delay.
the ability to output higher voltages.
more modern design.
very low power consumption.

28. The maximum current for a HIGH output on a standard TTL gate is

-10 ÂµA.
-400 ÂµA.
-1 ÂµA.
-10 mA.

29. The maximum current for a LOW output on a standard TTL gate is

16 ÂµA.
40 mA.
100 ÂµA.
16 mA.

30. The maximum input voltage recognized as a LOW by a TTL gate is

2.4 V.
0.8 V.
0.0 V.
0.4 V.

Practice VLSI Design Multiple Choice Questions (MCQs) to enhance your understanding and prepare for exams, interviews, and more. These questions are essential for anyone looking to master Very Large Scale Integration (VLSI) concepts.

About VLSI Design MCQ Questions

VLSI Design MCQs cover a wide range of topics, including digital design, semiconductor physics, and integrated circuit fabrication. These questions help you grasp the fundamental principles and advanced techniques used in designing complex electronic systems.

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Practicing VLSI Design MCQs is crucial for several reasons. It helps you prepare for academic exams, competitive tests, and job interviews. Regular practice reinforces your knowledge, improves problem-solving skills, and builds confidence. These questions are designed to test your understanding and ensure you can apply VLSI concepts effectively.

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