Consider the following statements for pneumatic and hydraulic control systems:
1. The normal operating pressure of pneumatic control is very much higher than that of hydraulic control.
2. In pneumatic control, external leakage is permissible to a certain extent, but there should be no leakage in a hydraulic control.
Which of the statements given above is/are correct?

In root locus analysis the breakaway and break in points

A. lie on the real axis

B. Either lie on the real axis or occur in complex conjugate pairs

C. Always occur in complex conjugate pairs

D. None of the above

Lag compensation permits a high gain at low frequencies.

A. True

B. False

The complicated shapes in the polar plots are only due to time constants in the numerator of transfer functions.

A. True

B. False

Which of the following features is not associated with Nichols chart?

A. (0 dB, -180°) point on Nichols chart represent critical Point (-1, 0)

B. It is symmetric about -180°

C. M loci are centred about (0 dB, -180°) point

D. The frequency at intersection of G (j$$\omega $$) locus and M = +3 dB locus gives bandwidth of closed loop system