FREQUENCY RESPONSE ANALYSIS

1.Frequency response mean

• a)Transient response of a system to a sinusoidal input

• b)Steady state response of a system to a sinusoidal input

• c)Oscillatory response of a system to a sinusoidal input

• d)None of these

A Bode plot consists of _____ graphs.

• two

• three

• four

THE GRAPH OF BODE PLOT IS

• MAGNITUDE VS FREQUENCY

• MAGNITUDE VS PHASE

• PHASE VS FREQUENCY

• BOTH 1 & 3

The frequency at which the phase plot is having the phase of -180 ⁰ is known as

• Gain cross over frequency

• gain margin

• phase cross over frequency

• phase margin

THE UNIT OF PHASE CROSS OVER FREQUENCY

• rad/sec

• rad

• sec/rad

The frequency at which the magnitude plot is having the magnitude of zero dB is known as

• gain margin

• gain cross over frequency.

• phase margin

• phase cross over margin

THE UNIT OF GAIN CROSS OVER FREQUENCY IS

• rad

• rad/sec

• rad sec

• none

If the phase cross over frequency ωpc is equal to the gain cross over frequency ωgc, then the control system is

• unstable

• stable

• marginally stable

If the phase cross over frequency ωpc is less than the gain cross over frequency ωgc, then the control system is

• stable

• marginal

• unstable

• none

The _______ is defined as the value of gain, to be added to system in order to bring the system to the verge of instability.

• phase margin

• gain margin,