# VLSI Questions and Answers – Switch Logic

This set of VLSI Multiple Choice Questions & Answers (MCQs) focuses on “Switch Logic”.

1. The subsystem of the circuits should have ______ interdependence.
a) minimum
b) maximum
c) no
d) more

Explanation: The subsystem of the circuit or system to be designed should have minimum interdependence and complexity.

2. Switch logic is based on
a) pass transistors
b) transmission gates
c) pass transistors and transmission gates
d) design rules

Explanation: Switch logic is based on pass transistors or transmission gates. Pass transistor describes several logic families used in the design of integrated circuits. This logic reduces the count of transistors used to make different logic gates, by eliminating redundant transistors.

3. The switch logic approach takes _____ static current.
a) low
b) more
c) no
d) very less

Explanation: The switch logic approach takes no static current from the supply rails and is faster for small arrays.

4. Power dissipation in switch logic is
a) less
b) more
c) high
d) very less

Explanation: Power dissipation is small in switch logic approach since current only flows on switching.

5. Features of switch logic approach
a) occupies more area
b) no undesirable threshold voltage
c) low power dissipation
d) all of the mentioned

Explanation: Some of the features of switch logic approach are that it occupies more area, eliminates undesirable threshold voltage and has low power dissipation.
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6. Pass transistor can be driven through _____ pass transistors.
a) one
b) no
c) more
d) two

Explanation: Pass transistor input should not be driven through any other pass transistors because there occurs loss in logic levels.

7. Basic AND and OR gate combinations are used in switch logic.
a) true
b) false

Explanation: Basic AND and OR combination of switches are possible and are used in switch logic. It is simple to design and easier.

8. When one pass transistor is driven using another, threshold voltage
a) affects
b) does not affect
c) all of the mentioned
d) none of the mentioned

Explanation: When logic levels are propogated through pass transistors are degraded by threshold voltage.

9. Switch logic approach is fast for
a) large arrays
b) small arrays
c) very large arrays
d) not at all fast for any type

Explanation: Switch logic approach is fast for smaller arrays and as the arrays becomes larger more switches and gates are requires which makes it a bit slower and complex.

10. Switch logic is designed using
a) complementary switches
b) silicon plates
c) conductors
d) resistors

Explanation: Switch logic is designed using n or p pass transistors or from complementary switches.

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