CS/B.TECH (EE/EEE-New)/SEM-4/EE-401/2012
2012
ELECTRICAL MACHINES-I
Time Allotted : 3 Hours Full Marks : 70
The figures in the margin indicate full marks.
Candidates are required to give their answers in their own words
as far as practicable.
GROUP – A
(Multiple Choice Type Question)
1. Choose the correct alternatives for any ten of the following:
10 x 1 = 10
i) For a P-pole machine, the relation between electrical and mechanical degrees is given by
a) θelec=2Pθmech b) θelec=4Pθmech
c) θmech=P2θelec d) θelec=P2θmech
ii) For eliminating nth harmonic from the emf generated in the phase of a 3-phase alternator, the chording angle should be
a) n× full-pitch b) 1n× full-pitch
c) 2n× full-pitch d) 3n× full-pitch
iii) The waveform of armature mmf in a dc machine is
a) square b) rectangular
c) triangular d) sinusoidal.
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