Which of the following statements is correct?

Question

Question

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UGC NET Paper 2: Electronic Science 3rd Dec 2021 Shift 2

Compensation of a second‐order instrument is done to decrease its damping ratio.
If the time constant of a temperature measuring system is increased, it would improve the frequency response of the system.
The mean square value of a random signal cannot be found from a plot of its mean square spectral density against ω.
Compensation of an instrument improves its dynamic characteristics.

Answer 1

The correct answer is option 4

Need for compensation of instrument

Compensation is a technique used to compensate for errors produced during measurement.
Compensation of the instrument improves the dynamic characteristics such as (i) Speed of response and Response time (ii) Lag (iii) Fidelity (iv) Dynamic error
Out of the above four characteristics the Speed of Response and the Fidelity is desirable in a dynamic system, while Lag and Dynamic error are undesirable.
The compensation of a second‐order instrument increases the damping ratio. By increasing the damping ratio oscillations are reduced in the system.
If the time constant of a temperature measuring system is increased, the settling time decreases and it would deteriorate the frequency response of the system.
The mean square value of a random signal can be found from a plot of its mean square spectral density against ω.