35.

36.

87.

38.

39.

If the ratio of, slip at maximum torque to slip at full-load torque is 4, then the ratio of
maximum torque to full-load torque is (neglect stator resistance) :

8 17

A oF ®) >
©) +4 17
© न 60) >

In a 4 pole de machine brushes are moved 4° electrical from M.N.A. The mechanical angle
through which brushes have been shifted is :

(A) 2 (B) 4°
(0 8 (D) 0°

-415 ‏5ل‎ J10

The node admittance matrix for a three bus system is givenby| ൧5 -J25 J20 |. Ifline
10 J20 -J30

connected between nodes (2) and (3) with line admittance of -J200 is removed, then the

new node admittance matrix is given by

-बाह ‏قل‎ 410 சத 08 ೪10
(A) | 7६5 ‏قدل-‎ 0 (8) | J5 -J5 J20
410 780-750 210 230 -೬10
-बाह ‏قل‎ 410 -बाह ‏قل‎ ஏம
(© | ‏قدلر- قل‎ 0 0) | 5 -J5 0
410 0 ൧0 ൧൨0 0 -410

If a power system consists of one slack bus, m generator buses, and n load buses, then the

ಲೈ ‏وك‎

formulated in Newton Raphson
J; Jy

size of the J, sub-matrix in the Jacobian matrix |

polar form is given by :
(A) (m+n)xn ൯ (m+n)x(mtn)
( nx(m+n) (D) nxn

The per unit impedance of a 400 MVA, 200 kV/400 kV transformer is 0.1. If the Base
quantities on h.v. side of the transformer are given as 100 MVA and 100 kVA, then the per
unit impedance of the transformer on new base quantities is :

(^) 0.025 p.u (B) 0.04 p.u

(0 0.40p.u (D) 0.10 p.u

9 080/2023
[P.T.0.]