6. For the transfer function

the phase cross-over frequency is :

(a) 0.5 rad/sec

(b) 1.732 rad/sec

(c) 0.707 rad/sec

(d) 2 rad/sec

7. A constant N-circle having centre at (- 1/2 + j0) in the G-plane, represents the phase angle equal to :

(a) 180°

(b) 90°

(c) 45°

(d) 0°

8. Octave frequency range is given by :

(a) ω1/ω2 = 2

(b) ω1/ω2 = 4

(c) ω1/ω2 = 8

(d) ω1/ω2 = 10

9. The phase angle for the transfer function

at corner frequency is :

(a) – 45°

(b) – 90°

(c) – 135°

(d) – 270°

10. Frequency response test is not recommended for system with :

(a) very low time constants

(b) with small time constant

(c) with large time constant

(d) any time constant

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