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Electronics and Communication Engineering (ECE) Exam  >  Electronics and Communication Engineering (ECE) Tests  >  Test: Signals And Systems & Microprocessors - 2 - Electronics and Communication Engineering (ECE) MCQ

Test: Signals And Systems & Microprocessors - 2 - Electronics and Communication Engineering (ECE) MCQ


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20 Questions MCQ Test - Test: Signals And Systems & Microprocessors - 2

Test: Signals And Systems & Microprocessors - 2 for Electronics and Communication Engineering (ECE) 2024 is part of Electronics and Communication Engineering (ECE) preparation. The Test: Signals And Systems & Microprocessors - 2 questions and answers have been prepared according to the Electronics and Communication Engineering (ECE) exam syllabus.The Test: Signals And Systems & Microprocessors - 2 MCQs are made for Electronics and Communication Engineering (ECE) 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Signals And Systems & Microprocessors - 2 below.
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Test: Signals And Systems & Microprocessors - 2 - Question 1
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 A sequence x(n) with the z-transform X(z) = z3 + 2z2 - 3z + z-1 - 4z-3 is applied as an input to a linear, time-invariant system with the impulse response h(n) = 28(n - 2) where

The output at n = 2 is__________________________________


Detailed Solution for Test: Signals And Systems & Microprocessors - 2 - Question 1

The output y(n) can be drived as,
y(z) = I-1(z) X(z)

1.--1(z) = 2z-2

Y(z) = 2z-2 (z3 + 2z2 - 3z + z-1 - 4z-3) Y(z) 2(z + 2 - 3z-1 +

Taking inverse z-transform of Y(z) y(n) 2[6(n + 1) + 28(n) - 36(n - 1) +

(n - 3) -46(p - 511

At n = 2, y(2) = 0

Test: Signals And Systems & Microprocessors - 2 - Question 2
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then causal sequence f(n) is

Detailed Solution for Test: Signals And Systems & Microprocessors - 2 - Question 2




On equating both sides we get. A 4- C = 3.

4A- 2B + C D = 5,

48 + D = 0




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Test: Signals And Systems & Microprocessors - 2 - Question 3
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Q. The value of X(eiπ) = ?

Detailed Solution for Test: Signals And Systems & Microprocessors - 2 - Question 3

Since 

∵ 

= -1, when n = odd = +1, when rt = even

So,
 X(eiπ) = (2 +0+  2 + 0 +

[1 - 1 - 1 - 1 - 1 + 1]

4- 2 = 2

 

Test: Signals And Systems & Microprocessors - 2 - Question 4
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Detailed Solution for Test: Signals And Systems & Microprocessors - 2 - Question 4

∵

at n 0, we have

= 2π X 2 = 4 π

Test: Signals And Systems & Microprocessors - 2 - Question 5
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The Laplace transform of the waveform shown in the figure below is

Then what is the value of 'C'?
Detailed Solution for Test: Signals And Systems & Microprocessors - 2 - Question 5

From the waveform shown we have, f(t) t u(t) - (t - 1) u(t - 1) -

(t - 4) u(t - 4) + 1 .5(t - 6) u(t - 6)

- 1,5(t - 8) LAO - 8)

∴ F(s) = LT of f(t)

Comparing this with the given Laplace transform and we get,

C = +1.5

Test: Signals And Systems & Microprocessors - 2 - Question 6
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Fourier transform of the signal shown in figure below is,
Detailed Solution for Test: Signals And Systems & Microprocessors - 2 - Question 6

Also, from the given plot we have

x(t) = u(t 2) + u(t + 1) - u(t - 1) - u(t - 2)

••• (I)



 

Test: Signals And Systems & Microprocessors - 2 - Question 7
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Answer Questions (22 and 23):

A DTS described by H(z) =  when

 

excited by x[n] = cos(0.2 n + 10°) with discrete frequency Ω = 0.2.

Q. Find H(ejΩ) at Ω = 0.2 and is equals to
Detailed Solution for Test: Signals And Systems & Microprocessors - 2 - Question 7

For the given input x[n] cos 2n

response, y[n] 

Now

Test: Signals And Systems & Microprocessors - 2 - Question 8
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Answer Questions (22 and 23):

A DTS described by H(z) =  when

 

excited by x[n] = cos(0.2 n + 10°) with discrete frequency Ω = 0.2.

Q. The steady state response y[n] is given by
Detailed Solution for Test: Signals And Systems & Microprocessors - 2 - Question 8

Now the steady state response

y[n] = 0.25 cos[0.2 n 10° + 14,1°) [n] = 0.25 cos[0.2 n +24.1°1

Test: Signals And Systems & Microprocessors - 2 - Question 9
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 Fourier analysis of waveform shown in figure

Q. The waveform is
Detailed Solution for Test: Signals And Systems & Microprocessors - 2 - Question 9

wave form is neither odd nor even.

Test: Signals And Systems & Microprocessors - 2 - Question 10
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 Fourier analysis of waveform shown in figure

Q.  In the waveform shown

1.

2.
3.
4.
5.
Test: Signals And Systems & Microprocessors - 2 - Question 11
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Causal sequence f(n) if F(z) =

, is given by
Detailed Solution for Test: Signals And Systems & Microprocessors - 2 - Question 11



........................(i)

........................(ii)

From 0) and 0) we get

A 1, B = 1, C = -1

Also we know, f(n) = Inverse z-transform of F(z)

f(n) = [(-1)n (-3)n - (2)n ] u (n)

Test: Signals And Systems & Microprocessors - 2 - Question 12
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A signal x1(t) is having Fourier transform

Xi(co). Another signal x2(t) having Fourier transform X2(w) is related to Xi(co) by X2(w) = [1 +sg n(w)]Xi (co)

Value of x2(t) in terms of x1(t) will be
Detailed Solution for Test: Signals And Systems & Microprocessors - 2 - Question 12

Test: Signals And Systems & Microprocessors - 2 - Question 13
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After some arithmetic operation flag register of 8085 microprocessor becomes BBH. The contents of the accumulator after the operation may be
Detailed Solution for Test: Signals And Systems & Microprocessors - 2 - Question 13

Flag registers in 808511P is as,

Since, sign bit of 138.1-1. is 1 so, number is negative from the given choice only (c) or (d) gives the sign bit T.

Here, parity bit = 0 means total number of 1 's present is odd

So, only options (d) contains odd nu -r. her of 1's

 Here five l's are present.

Test: Signals And Systems & Microprocessors - 2 - Question 14
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The contents of register HL pair is 24FF H. Then the contents of register pair if, 1NR H and INR L operations are performed is
Detailed Solution for Test: Signals And Systems & Microprocessors - 2 - Question 14

∴  [H] <— 24
and [L] <— FF

INH H means increment the content of 'H' by 01.

  ∴          [H] <—  25

and       [L] <— FE

⇒ Content of H-L pair = 25FF H

L means increment the content of 'L'by 01.

∴    [H] <—  24

and    [L]   <— [FF] + [01]

i.e.  [L] <— 00

⇒ Content of IH-L pair = 2400 H

Test: Signals And Systems & Microprocessors - 2 - Question 15
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If the HLT instruction of a 8085 microprocessor is executed then,
Detailed Solution for Test: Signals And Systems & Microprocessors - 2 - Question 15

HLT  →  is a 1-byte instruction.

→ processor stops executing and enters wait state

→ no register contents are affected.

 → the address bus and data bus are placed in high impedance state

Test: Signals And Systems & Microprocessors - 2 - Question 16
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Line :                     MVI A,               B5H

MVI B,              OEH

XRI                   69H

ADD

ANI                    9BH

CPI                    9FH

STA                   3010 H

HLT

After execution of STA 3010H the status of Cy and Z flag will be
Detailed Solution for Test: Signals And Systems & Microprocessors - 2 - Question 16

 

Line    Cy        Z

1

2           0         0

3           0         0

4           0         0

0          0

6           1         0

7         1

Test: Signals And Systems & Microprocessors - 2 - Question 17
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Three memory chips are of size 1 kB, 2 kB and 4 kB. Their address bus is 10 bits. The data bus sizes of chips are respectively
Detailed Solution for Test: Signals And Systems & Microprocessors - 2 - Question 17

∴ Memory size

= Add, bus size x Data bus size.

=(2)add bus line x.(Data bus size)

So, for 1 kB Chip.

Data bus size = 

For 2 kB chip,

Data bus size =

= 16 bits

For 4 kB chip, Elata bus size

= 32 bits

Test: Signals And Systems & Microprocessors - 2 - Question 18
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An 8085 assembly language program is given below:

MV1C,           03H

LXI H,             2000 H

MOV             A, M

DCR

LOOP 1 : INX H

MOV B, M CMP B

JNC LOOP 2 MOV A, B

LOOP 2 : DCR C

JNZ LOOP 1 STA 2100 H HLT

Contents of memory location 2000: 18 H

2001 : 10H

2002 : 2BH

Q At the end of the program what will be the condition of carry and zero flags?
Test: Signals And Systems & Microprocessors - 2 - Question 19
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An 8085 assembly language program is given below:

MV1C,           03H

LXI H,             2000 H

MOV             A, M

DCR

LOOP 1 : INX H

MOV B, M CMP B

JNC LOOP 2 MOV A, B

LOOP 2 : DCR C

JNZ LOOP 1 STA 2100 H HLT

Contents of memory location 2000: 18 H

2001 : 10H

2002 : 2BH

Q  What does the program do?
Detailed Solution for Test: Signals And Systems & Microprocessors - 2 - Question 19

Program is searching the value higher than the content of accumulator.

Test: Signals And Systems & Microprocessors - 2 - Question 20
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Consider the given instructions of program for the delay register.

MVI           C, FFH

LOOP: DCR              C

JNZ           LOOP

Assume clock frequency of the system is 2 MHz.

Q.  The total T-states for this above programme is given by
Detailed Solution for Test: Signals And Systems & Microprocessors - 2 - Question 20

MVI C, FFH  →  7 T-states

LOOP: DCR C  → 5 T-states

JNZ LOOP → 10 T-states

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