Electronics and Experimental Methods-Filtering and Noise Reduction (CSIR Physical Sciences): Questions 1 - 2 of 3

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Question number: 1

» Electronics and Experimental Methods » Filtering and Noise Reduction

Appeared in Year: 2014

MCQ▾

Question

Consider a Low Pass (LP) and High Pass (HP) filter with cut – off frequency fLP and fHP respectively, connected in series or in parallel configuration as shown in figure A and B below:

Series and Parallel Configuration of HP and LP filter

Series and Parallel Configuration of HP and LP Filter

In figure Low Pass (LP) and High Pass (HP) filter, connected in series and parallel configuration as shown in figure A and B, respectively.

Which of the following statement is correct? (December)

Choices

Choice (4) Response

a.

For fHP<fLP , A acts as a Band Pass filter and B acts as a Band Reject filter.

b.

For fHP>fLP , A passes the signal without filtering and B acts as a Band Reject filter.

c.

For fHP<fLP , A acts as a Band Pass filter and B passes the signal without filtering.

d.

For fHP>fLP , A stops the signal from passing through and B passes the signal without filtering.

Question number: 2

» Electronics and Experimental Methods » Filtering and Noise Reduction

Appeared in Year: 2013

MCQ▾

Question

The input to a lock – in amplifier has the from Vi(t)=Visin(ωt+θi) where Vi,ω,θi are the amplitude, frequency and phase of the input signal respectively. This signal is multiplied by a reference signal of the same frequency ω , amplitude Vr and phase θr . If the multiplied signal is fed to a low pass filter of cut – off frequency ω , then the final output signal is –

(June)

Choices

Choice (4) Response

a.

ViVr[cos(θiθr)cos(12ωt+θ1+θr)]

b.

ViVr[cos(θiθr)+cos(12ωt+θi+θr)]

c.

ViVrsin(θiθr)

d.

12ViVrcos(θiθr)

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