A thermometer requires 1 minute to indicate 98% of its final response to a step input. If it is a first order system the time constant is

Electronics and Communication Engineering (ECE) : Automatic Control Systems - Quiz(MCQ)

1 minute

0.5 minute

0.25 minute

0.1 minute

Correct Answer : Option (C) : 0.25 minute

Explanation :

0.98 = 1 - e^-1/T or T = 0.25 minute.

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is +90Â°

is -90Â°

depends on the damping factor

None of the above

Correct Answer : is -90Â°

The response to sinusoidal excitation can be found by

setting s = jÏ‰ in the network function

setting s = -jÏ‰ in the network function

taking inverse transform of network function

None of the above

Correct Answer : setting s = jÏ‰ in the network function

The resolution of a wire wound potentiometer is about

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0.001%

Correct Answer : 0.1%