17.

18.

19.

20.

21.

23.

24,

26.

The impulse response of a system is h{n)=a" u (n). The condition for the system fo be BIBO
stable is :

(4) ais real and posibive B |२|<1

(9) ais real and negative (0) |al=1

The continuous time system described by (1) = (१२) {5 :
(^) causal, non - linear (8) നല causal, linear
{C) non causal, non - linear (ப) causal, linear

The region of convergence of the z-transform of the signai 2" u(n} — ‏:اكات )راق‎
(வ) ௩21௨1 () ७2 < |2 | <3
© ॐ | 2 | <1 (0) does not exist

The Fourier Transform of a rectangular pulse is |
(A) Another rectangular pulse (8) Triangular pulse
(C) Sinc function (0) Impulse

The open circuil lest of a transformer gives information about :
(வ Core losses of the transformer (18) Cu losses of the transformer
(C) Both (A) and (B) _ (D) None of these

For a transformer which of the following connection is best suited for 3 phase, 4 wire
service ?
(A) Star - delta (B) Delta- delta (09) Delta - star (D) Star - star

The typical value of turns ratio of a transformer used only for electrical isolation between
two circuils can be :

(है) <1 றி: =1 )© 1 10.4 (D) Fqual to unity

A transformer 4,000 KVA, 250 Hz is operated at 50 Hz Its KVA rating should be revised to :
(A) 800 kVA (ए) 10,000 ۸۸

(C) 4000 kVA (10) Cannot be revised

Among the following the transformer having largest size is :
(ಯ) 250 kVA, 25 112 (8) 250 kVA, 100 Hz
(€) 250 kVA, 50 Hz (D} 250 kVA, 60 Hz

Incorrect polarity of transformers during parallel operation of transformers will result in :
(ക) ഓണ ബഡ്‌!

(8) Dead short circuit

(C) Regeneration of power

(72) Power factor of transformer will be different from that of the connected load

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