Digital Electronics Basics Quiz

1. The following gate output is zero when all the input levels applied is high

A. NAND
B. XOR
C. XNOR
D. NOR

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A. NAND

2. VLSI stands for
A. Very Large Speed IC
B. Very Large Speed Integration
C. Very Large Scale Integration
D. Very Large Space IC

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C. Very Large Scale Integration

3. Which of the following logics has excellent noise margin ?

A. CMOS
B. ECL
C. TTL
D. All of these

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A. CMOS

4. In boolean algebra A.B = B.A represents _________ law.

A. commutative
B. associative
C. distributive
D. none of the above

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A. commutative

5. Boolean algebra is essentially based on

A. logic
B. symbols
C. ON
D. high

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A. logic

6. The output of a logic gate is '1' when all its inputs are at logic '0' . Then the gate is either

A. A NAND or a EX-OR gate
B. A NOR or a EX-NOR gate
C. An OR or a EX-NOR gate
D. An AND or a EX-OR gate

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B. A NOR or a EX-NOR gate

7. The Mutliplexer device is also called as
A. Data latching device
B. Data encoder device
C. Data decoder device
D. Data selector device

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D. Data selector device

8. Minimum number of J-K flip-flops needed to construct a BCD counter is

A. 2
B. 3
C. 4
D. 5

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C. 4

9. The output of a Moore sequential machine is a function of

A. All present states of the machine
B. All the inputs
C. A few combination of inputs and the present state
D. All the combinations of inputs and the present state

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D. All the combinations of inputs and the present state

10. The number of unused states in a 4-bit Johnson counter is

A. 2
B. 4
C. 8
D. 12

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C. 8