# Electronics and Communication Engineering - Digital Electronics

1.

The inputs to logic gate are 0. The output is 1. The gate is

 A. NAND or XOR B. OR or XOR C. AND or XOR D. NOR or Ex-NOR

Explanation:

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2.

In a JK master slave flip flop race condition does not occur.

 A. True B. False

Explanation:

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3.

State transition table and state transition diagram form part of design steps for

 A. combinational circuits B. sequential circuits C. delay circuits D. all of the above

Explanation:

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4.

Which binary subtraction is incorrect?

 A. 100101 - 100011 = 000000 B. 10000000 - 01000000 = 1000000 C. 10111110.1 - 101011.11 = 110010.11 D. 11111111 - 1111111 = 10000000

Explanation:

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5.

Consider the following statements:

1. Race around condition can occur in JK flip flop when both inputs are 1
2. A flip flop is used to store one bit of information
3. A transparent latch is a D type flip flop
4. Master slave flip flop is used to store two bits of information
Which of the above are correct?

 A. 1, 2, 3 B. 1, 3, 4 C. 1, 2, 4 D. 2, 3, 4