46. Advantage of using bundled conductors in transmission lines is to :
(ക) reduce sag
(8) மட mechanical strength of the line
(9) reduce corona
(1)) all of these

47. The major factor in the insulation strength of an EHV transmission line 1s :
(A} corona (B) swilching over - voltages
(C) harmonics (D) load power factor

48. An open loop system represented by the transfer function Gs) = ಗ 15:
(A) Stable and of the non - minimum phase type

(ए) Unstable and of non - minimum phase type

(೮) Stable and of the minimum phase type

(D} Unstable and of the minimum phase type

4१. The number of roots in the left half of s - plane for the equation, s>~ 4s? + s+ 6 =0 will be :
(ಗಿ) Zero (೫) ‏وت‎ (0 സം (D) Three

_[__]5
K1+ =
50. Transfer function of a lead compensator used for a closed loop controller is 21 For

5
1+3
(1)
such a lead compensator :
(ಸಿ) > < (8) a>Kb (€) a
51, As compared to a closed loop system an open loop system is ;
(A) more stable മട well as more accurate
(B) less stable as well as less accurate
)© less stable but more accurate
(D) more stable but less accurate

52, In the G(sjH(s) plane the Nyquist plot of loop transfer function G(s)H(s) of a closed loop
control system passes through the point (1, ) 0). The phase margin of the system is :

കു 45" ® 0 (©) 180“ (೧) 90“

213/2014 8 A