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Electronics and Communication Engineering - Exam Questions Papers

Exercise : Exam Questions Papers - Exam Paper 6
26.
The following circuit represents :
A(B + CD) BC
AB + BC + ACD
none of these
Answer: Option
Explanation:

27.
In the circuit shown below current through the resistor is shown. Voltage across 4 Ω resistor is:
8 volt
≈ 5.87 V
≈ 6.87 V
None of these
Answer: Option
Explanation:

Voltage across 5 Ω = 10 V

Thus voltage across 7 Ω = 10 V (5 Ω || 7 Ω)

28.
If the function A, B are A = R + PQ + RS B = PQRS + PQRS + PQRS
Which of the following is true?
A = B
A = B
no direct relation between A and B
insufficient data
Answer: Option
Explanation:

A = R + PQ + RS

B = PQ R S + P Q R S + PQ R S

29.
In 8085 microprocessor system, what will be the total delay provided by the following loop.
MVI A, 11H
LXI B, 12FFH
Delay: DCX B
XTHL
NOP
XRA B
JNZ Delay
where system clock is operating at 3 MHz.
3.154 msec
3.514 msec
2.644 msec
3.166 msec
Answer: Option
Explanation:

8085 T-States

MVI A, 11H 7

LX1 B, 12FFH 10

Delay: DCX B 6

XTHL 16

NOP 4

XRA B 4

JNZ Delay 10/7

Total T states = 7 + 10 + 255(6 + 16 + 4 + 4 + 7) + 10 = 9462

Therefore total delay introduced = = 3.154 m sec.

30.
A speech signal, band limited to 4kHz and peak voltage varying between + 5V and - 5V is sampled at the Nyquist rate. Each sample is quantized and represented by 8 bits. The number of quantization levels required to reduce the quantization noise by a factor of 4 would be
1024
512
256
64
Answer: Option
Explanation:

To reduce quantization noise by 4

No. of levels should increase by 2

Thus 512 levels are required.

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