Electronics and Experimental Methods (CSIR (Council of Scientific & Industrial Research) Physical Sciences): Questions 31 - 32 of 50

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Question number: 31

» Electronics and Experimental Methods » Filtering and Noise Reduction

Appeared in Year: 2013

MCQ▾

Question

The input to a lock – in amplifier has the from where are the amplitude, frequency and phase of the input signal respectively. This signal is multiplied by a reference signal of the same frequency , amplitude and phase . If the multiplied signal is fed to a low pass filter of cut – off frequency , then the final output signal is –

(June)

Choices

Choice (4) Response

a.

b.

c.

d.

Question number: 32

» Electronics and Experimental Methods » Digital Techniques and Applications » Registers

Appeared in Year: 2014

MCQ▾

Question

For the logic circuit shown in the figure below, a simplified equivalent circuit is –

A logic circuit of three inputs

A Logic Circuit of Three Inputs

In figure a logic circuit of three inputs of A, B and C is shown in figure.

A simplified equivalent circuit is – (June – 2014)

Choices

Choice (4) Response

a.

A simplified circuit -Choice A

A Simplified Circuit -Choice A

In figure a simplified circuit is shown.

b.

A simplified circuit -Choice B

A Simplified Circuit -Choice B

In figure a simplified circuit is shown.

c.

A simplified circuit -Choice C

A Simplified Circuit -Choice C

In figure a simplified circuit is shown.

d.

A simplified circuit -Choice D

A Simplified Circuit -Choice D

In figure a simplified circuit is shown.

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