Deemed University 2009 A.M.I.E.T.E Electronics & Communication Engineering Electrical engineering – et (old scheme) - Question Paper

AMIETE – ET (OLD SCHEME)

Code: AE10 Subject: ELECTRICAL ENGINEERING
Time: three Hours Max. Marks: 100

NOTE: There are nine ques. in all.
· ques. one is compulsory and carries 20 marks. ans to Q. 1. must be written in the space given for it in the ans book supplied and nowhere else.
· Out of the remaining 8 ques. ans any 5 ques.. every ques. carries 16 marks.
· Any needed data not explicitly given, may be suitably presumed and said.



Q.1 select the accurate or the best option in the following: (210)

a. Transformer-core laminations are made of

(A) Cast iron. (B) Wrought iron.
(C) Silicon Steel. (D) Cast steel.

b. For successful parallel operation of 2 single-phase transformers, the
essential condition is that their

(A) Percentage impedances should be equal.
(B) Turn ratios should be exactly equal.
(C) Polarities must be properly connected.
(D) KVA ratings should be equal.

c. If the field of a synchronous motor is under excited, the power factor
will be

(A) Lagging. (B) Leading.
(C) Unity. (D) More than unity.

d. In DC machine, the armature reaction mmf is

(A) Stationary with respect to armature.
(B) Rotating with respect to stator.
(C) Stationary with respect to stator.
(D) Rotating with respect to brushes.

e. If a 3-phase, four pole, 50 Hz induction motor runs at a speed of 1440 r.p.m,
then the slip is

(A) 0.03. (B) 0.10.
(C) 0.04. (D) 0.05.

f. The voltage applied to the rotor of synchro is always

(A) DC negative. (B) DC positive.
(C) AC. (D) may be AC or DC.

Earning:   Approval pending.