BARC 2018 ECE: Analog Electronics Nuclear Quiz 4

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Question 1

Consider the circuit shown below
Assume
(1)

(2)
(3)

(4)
Which of the following circuits represents an all pass filter.

• A(1) and (4)
• B(2) and (3)
• C(2) only
• DAll of the above

Question 2

The value of C required for sinusoidal oscillation of frequency 1 kHz in the circuit of fig is

• A
• B
• C
• D

Question 3

The block diagram of a frequency synthesizer consisting of a Phase Locked Loop (PLL) and a divide-by-N counter (comprising ÷2, ÷4, ÷8, ÷16 outputs) is sketched below. The synthesizer is excited with a 5 kHz signal (Input 1). The free-running frequency of the PLL is set to20 kHz. Assume that the commutator switch makes contacts repeatedly in the order 1-2-3-4.
 
The corresponding frequencies synthesized are:

• A10 kHz, 20 kHz, 40 kHz, 80 kHz
• B20 kHz, 40 kHz, 80 kHz, 160 kHz
• C80 kHz, 40 kHz, 20 kHz, 10 kHz
• D160 kHz, 80 kHz, 40 kHz, 20 kHz

Question 4

For the circuit in fig. and . The value of is:-

• A0.9 V
• B1.19 V
• C2.14 V
• D1.84 V

Question 5

For the op-amp circuit shown below

What is the frequency of oscillations?

• ACR
• BR/C
• C(CR)^-1
• D(R/C)^-1

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