40. The inductance per loop meter of a single-phase transmission line with horizontal layout as
shown in figure below is:

D

७) ௨௮07-2 Im ௫ ஊட 1 tm
7 406065) ‏»ا‎ 0.6065 xr, xr,

(© 41071०0 प ‏2ے ور مہہ رو‎ पाक
‏:لہ‎ 0.6065 ××

41. A transmission line with line impedance Z has all its line charging admittance Y placed at
receiving end. The ratio of sending end voltage to receiving end voltage under no-load
condition is :

(A) 1 (B) ZY
(൫ 1+ZY ‏كين بم‎

2

42. A string of 4 disc insulators has a string efficiency of 75%. If C is the capacitance between the
metal parts of the insulator and the tower structure, then the leakage current from bottom
insulator pin to ground is (Take Vas rated line voltage) :

(+ ५५८ ew “
¢ 2VwC VwC
‏م م‎

43. Identify the correct and incorrect statements, which refer to protective relays :

]. The ratio of reset to pickup value in case of electromagnetic attraction type relays is
higher than that of electromagnetic induction type relays.

Il. Induction cup type relay is more sensitive than induction disk type relay, and can be
used for high speed application.

111. The actuating torque in induction type relays is proportional to cosine of the angle
between the two fluxes.

IV. The rotation of the disk in an induction disk relay, is from unshaded pole to shaded
pole.

(^) Only Tis incorrect

൯ I, I are correct, but II, IV are incorrect
(C) I, IVare correct, but I, II are incorrect
(D) Only IV is incorrect

080/2023 10 A