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775.

An 8085 assembly language program is given below. Assume that the carry flag is initially unset. The content of the accumulator after the execution of the program is

MVI A, 07H
RLC
MOV B, A
RLC
RLC
ADD B
RRC

[2 marks]
(A) 8H
(B) 64H
(C) 23H
(D) 15H

asked in Electronics and Communication Engineering, 2011

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776.

The first six points of the 8-point DFT of a real values sequence are 5, 1-j3, 0, 3-j4, 0 and 3+j4. The last two points of the DFT are respectively [2 marks]
(A) 0, 1-j3
(B) 1+j3, 5
(C) 0, 1+j3
(D) 1-j3, 5

asked in Electronics and Communication Engineering, 2011

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777.

For the BJT Q₁ in the circuit shown below, β = ∞, V_BEon= 0.7V, V_CEsat =0.7V. The switch is initially closed. At time t=0, the switch is opened. The time t at which Q₁ leaves the active region is

[2 marks]
(A) 10 ms
(B) 25 ms
(C) 50 ms
(D) 100 ms

asked in Electronics and Communication Engineering, 2011

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778.

In the circuit shown below, the network N is described by the following Y matrix:

The voltage gain V₂/V₁ is [2 marks]

(A) 1/90
(B) -1/90
(C) -1/99
(D) -1/11

asked in Electronics and Communication Engineering, 2011

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779.

In the circuit shown below, the initial charge on the capacitor is 2.5 mC, with the voltage polarity as indicated. The switch is closed at time t=0. The current i(t) at a time t after the switch is

[2 marks]
(A) i(t) = 15 exp(-2x10^-3t) A
(B) i(t) = 5 exp(-2x10^-3t) A
(C) i(t) = 10 exp(-2x10^-3t) A
(D) i(t) = -5 exp(-2x10^-3t) A

asked in Electronics and Communication Engineering, 2011

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780.

A fair dice is tossed two times. The probability that the second toss results in a value that is higher than the first toss is [2 marks]
(A) 2/36
(B) 2/6
(C) 5/12
(D) 1/2

asked in Electronics and Communication Engineering, 2011

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