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Electrical Machines
Synchronous Machines
Contruction and Physical Phenomenon

Questions mapped to Contruction and Physical Phenomenon under Synchronous Machines.

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Q#1 Synchronous Machines GATE EE 2014 (Set 3) MCQ +1 mark -0.33 marks

In a synchronous machine, hunting is predominantly damped by

mechanical losses in the rotor

iron losses in the rotor

copper losses in the stator

copper losses in the rotor

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Q#2 Synchronous Machines GATE EE 2004 (Set 1) MCQ +2 marks -0.66 marks

The synchronous speed for the seventh space harmonic mmf wave of a 3-phase, 8 pole, 50 Hz induction machine is

107.14 rpm in forward direction

107.14 rpm in reverse direction

5250 rpm in forward direction

5250 rpm in reverse direction

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Q#3 Synchronous Machines GATE EE 2004 (Set 1) MCQ +2 marks -0.66 marks

A hydraulic turbine having rated speed of 250 rpm is connected to a synchronous generator. In order to produce power at 50 Hz, the number of poles required in the generator are

6

12

16

24

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Q#4 Synchronous Machines GATE EE 2003 (Set 1) MCQ +2 marks -0.66 marks

A 4-pole, 3-phase, double layer winding is housed in a 36-slot stator for an ac machine with 60° phase spread. Coil span is 7 slot pitches. Number of slots in which top and bottom layers belong to different phases is

24        

18

12

0

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Q#5 Synchronous Machines GATE EE 2000 (Set 1) MCQ +1 mark -0.33 marks

The phase sequence of a three-phase alternator will reverse if

The field current is reversed keeping the direction of rotation same

The field current remains the same but the direction of rotation is reversed

The field current is reversed and the number of poles is doubled

The number of poles is doubled without reversing the field current

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