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571.

For the circuit shown in the figure, D has a transition from 0 to 1 after CLK changes from 1 to 0. Assume gate delays to be negligible.

Which of the following statements is true? [2 marks]
(A) Q goes to 1 at the CLK transition and stays at 1
(B) Q goes to 0 at the CLK transition and stays at 0
(C) Q goes to 1 at the CLK transition and goes to 0 when D goes to 1
(D) Q goes to 0 at the CLK transition and goes to 1 when D goes to 1

asked in Electronics and Communication Engineering, 2008

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572.

For each of the positive edge-triggered J-K flip flop used in the following figure, the propagation delay is ΔT.

Which of the following waveforms correctly represents the output at Q₁?
[2 marks]

asked in Electronics and Communication Engineering, 2008

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573.

For the circuit shown in the following figure I₀-I₃ are inputs to the 4:1 multiplexer R(MSB) and S are control bits.

The output Z can be represented by [2 marks]
(A) PQ + PQS + Q R S
(B) PQ + PQR + P Q S
(C) PQ R + P QS + PQRS + Q R S
(D) PQR + PQRS + PQ R S + Q R S

asked in Electronics and Communication Engineering, 2008

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574.

Which of the following Boolean Expression correctly represents the relation between P, Q, R and M₁? [2 marks]

(A) M₁ = (P OR Q) XOR R
(B) M₁ = (P AND Q) XOR R
(C) M₁ = (P NOR Q) XOR R
(D) M₁ = (P XOR Q) XOR R

asked in Electronics and Communication Engineering, 2008

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575.

The two numbers represented in signed 2’s complement form are
P = 11101101 and Q = 11100110. If Q is subtracted from P, the value obtained in signed 2’s complement form is [2 marks]
(A) 100000111
(B) 00000111
(C) 11111001
(D) 111111001

asked in Electronics and Communication Engineering, 2008

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576.

Consider the following assertions
S1: For Zener effect to occur, a very abrupt junction is required
S2: For quantum tunneling to occur, a very narrow energy barrier is required
Which of the following is correct? [2 marks]
(A) Only S2 is true
(B) S1 and S2 are both true but S2 is not a reason for S1
(C) S1 and S2 are both true and S2 is a reason for S1
(D) Both S1 and S2 are false

asked in Electronics and Communication Engineering, 2008

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