WBUT 2012 ELECTRICAL MACHINES-I [EE-401] Question Paper

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 n^th 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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