Phase lag of the sinusoidal response of a first order system is

Phase lag of the frequency response of a second order system to a sinusoidal forcing function

A

Is 30°

B

Is 90° at the most

C

Approaches 180° asymptotically

D

Is 120°

According to Bode stability criterian, a system is unstable, if the open loop frequency response exhibits an amplitude ratio exceeding unity at frequency for which phase lag is

A

0°

B

45°

C

90°

D

180°

Response of a system to a sinusoidal input is called __________ response.

A

Impluse

B

Unit step

C

Frequency

D

None of these

What is the ratio of output amplitude to input amplitude for a sinusoidal forcing function in a first order system?

A

1

B

>1

C

None of these

A sinusoidal variation in the input passing through a linear first order system

A

Becomes more oscillatory (frequency increases)

B

Becomes less oscillatory (frequency decreases)

C

Gets amplified (magnitude increases)

D

Gets attenuated (magnitude decreases)

A phase lag lead network introduces in the output

A

Lag at all frequencies

B

Lag at high frequencies and lead at low frequencies

C

Lag at low frequencies and lead at high frequencies

D

None of the above mentioned

In a lag network, the output voltage lags the input voltage in phase.

A

True

B

False

The phase lag produced by transportation relays

A

Is independent of frequency

B

Is inversely proportional to frequency

C

Increases linearly with frequency

D

Decreases linearly with frequency

Polyphase is characterized by two or more sinusoidal voltages, each having a different phase angle.

A

True

B

False

The frequency response of a first order system, has a phase shift with lower and upper bounds given by

A

$$ - \infty ,\,\frac{\pi }{2}$$

B

$$ - \frac{\pi }{2},\,\frac{\pi }{2}$$

C

$$ - \frac{\pi }{2},\,0$$

D

$$0,\,\frac{\pi }{2}$$

Phase lag of the sinusoidal response of a first order system is

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