75, Which loss will increase rapidly as compared to ‏کے‎ when the number of magnetic reversals
is increased ?

(A} friction loss (8) copper loss (C) hysteresisloss (D) eddy current loss

76.

ಈ

Leakage fluxes in a transformer may be minimized by :

(A) sectionalizing and interleaving the primary and secondary windings
(8) constantly cooling the core

(C) under rating the transformer

(D) reducing the reluctance of the iron core to the minimum

77. A transformer working under maximum efficiency has total losses of 1600 W, while operating
at half load, the copper loss will be :

(ക) ۷ (B) 400 W (© 200w (D) 100 W

78. Salient poles are generally used on :
(ക) high speed prime movers only (8) medium speed prime movers only

)© low speed prime movers only (ப) low and medium speed prime movers only

79, If the slip of the rotor of an induction motor is halved, the value of rotor reactance :
(A) doubled (8) unchanged
(ಲ) halved (D) reduced to one fourth

80. A d-pole, 50 Hz, 3 phase mduction motor has a rotor resistance ല്‌ 0.21 ochm per phase and
standstill reactance of 0.7 ohm per phase. The speed at which maximum torque is
developed :

(A) 1500 rpm (8) 3000 rpm (ಲ) 1455 rpm (D) 1460 rpm

83, Indian Constitution consisis of :

(A) 365 articles (8) 375 articles (C) 385 articles (D) 395 articles

82. The first annual conference of S.N.D.P. Yogam was held at :

{A) Kollam (8) Varkala
)© Chempazhanthy (D) Aruvipuram
195/2015 12 A

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