Electronics & Communication Gate Yearwise 

Electronics and Communication Gate 2014 Set-4 Questions with Answer

Ques 53 GATE 2014 SET-4

An 8085 microprocessor executes "STA 1234H" with starting address location 1FFEH (STA copies the contents of the Accumulator to the 16-bit address location). While the instruction is fetched and executed, the sequence of values written at the address pins A15 − A8 is

A

1FH, 1FH, 20H, 12H

B

1FH, FEH, 1FH, FFH, 12H

C

1FH, 1FH, 12H, 12H

D

1FH, 1FH, 12H, 20H, 12H


(a) is the correct answer.

Ques 54 GATE 2014 SET-4

The circuit shown in the figure represents a

A

voltage controlled voltage source

B

voltage controlled current source

C

current controlled current source

D

current controlled voltage source


(c) is the correct answer.

Ques 55 GATE 2014 SET-4

The magnitude of current (in mA) through the resistor R2 in the figure shown is_______.


(2.8) is the correct answer.

Ques 56 GATE 2014 SET-4

The steady state output of the circuit shown in the figure is given by
y(t) = A(ω)sin(ωt + φ(ω)). If the amplitude |A(ω)| = 0.25, then the frequency ω is

A

1/(√3RC)

B

2/(√3RC)

C

1/(RC)

D

2/(RC)


(b) is the correct answer.

Ques 57 GATE 2014 SET-4

In the circuit shown in the figure, the value of vo(t) (in Volts) for t → ∞ is ______.


(31.25) is the correct answer.

Ques 58 GATE 2014 SET-4

The equivalent resistance in the infinite ladder network shown in the figure, is Re.

The value of Re/R is ________


(2.62) is the correct answer.

Ques 59 GATE 2014 SET-4

For the two-port network shown in the figure, the impedance (Z) matrix (in Ω) is

A

[6 24; 42 9]

B

[9 8; 8 24]

C

[9 6; 6 24]

D

[42 6; 6 60]


(c) is the correct answer.

Ques 60 GATE 2014 SET-4

A Fourier transform pair is given by<

where u[n] denotes the unit step sequence. The values of A is _________.


(3.37) is the correct answer.

Ques 61 GATE 2014 SET-4

A real-valued signal x(t) limited to the frequency band |f| ≤ W/2 is passed through a linear time invariant system whose frequency response is

The output of the system is

A

x(t + 4)

B

x(t − 4)

C

x(t + 2)

D

x(t − 2)


(x(t − 2)) is the correct answer.

Ques 62 GATE 2014 SET-4

The sequence x[n] = 0.5nu[n], where u[n] is the unit step sequence, is convolved with itself to obtain y[n]. Then ∑n=−∞+∞ y[n] is _______.


(4) is the correct answer.

Ques 63 GATE 2014 SET-4

A stable linear time invariant (LTI) system has a transfer function H(s) = 1/(s2+s−6). To make this system causal it needs to be cascaded with another LTI system having a transfer function H1(s). A correct choice for H1(s) among the following options is

A

s + 3

B

s − 2

C

s − 6

D

s + 1


(b) is the correct answer.

Ques 64 GATE 2014 SET-4

A causal LTI system has zero initial conditions and impulse response h(t). Its input x(t) and output y(t) are related through the linear constant-coefficient differential equation
d2y(t)/dt2 + α(dy(t)/dt) + α2y(t) = x(t).
Let another signal g(t) be defined as

If G(s) is the Laplace transform of g(t), then the number of poles of G(s) is _____.


(1) is the correct answer.

Ques 65 GATE 2014 SET-4

The N-point DFT X of a sequence x[n], 0 ≤ n ≤ N − 1 is given by

Denote this relation as X = DFT(x). For N = 4, which one of the following sequences satisfies DFT(DFT(x)) = x?

A

x = [1 2 3 4]

B

x = [1 2 3 2]

C

x = [1 3 2 2]

D

x = [1 2 2 3]


(b) is the correct answer.

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