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GATE EE 2018 EXAM:Electrical Machines Quiz 1

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Question 1

Match List-I with List-II and select the correct answer using the code given below the lists:
List-I
A) magnetic flux
B) Magneto motive force
C) Reluctance
D) Permeability
List-II
1) Resistance
2) Electric current
3) Conductivity
4) Electromotive force

Question 2

The stator of an alternator rarely uses …………… slots.

Question 3

Consider the following advantages of a distributed winding in a rotating machine:
1) Better utilization of core as a number of evenly placed small slots are used
2) Improved waveform as harmonic emf’s are reduced
3) Diminished armature reaction and efficient cooling
Which of the above advantages are correct?

Question 4

The breadth factor for 3^rd harmonic emf of a 3-phase, 4-pole, synchronous machine having 36 stator slots is

Question 5

The emf induced in a conductor of machine driven at 600 rpm, the peak value of flux density is 1.0 Wb/m², diameter of machine 2.0 meter and length of machine 0.30 m is

Question 6

A coil of 1000 turns is wound on a core. A current of 1 A flowing through the coil creates a core flux of 1 mWb. What is the energy stored in the magnetic field?

Question 7

A 20-pole alternator is having 180 identical stator slots with 6 conductors in each slot. All the coils of a phase are in series. If the coils are connected to realize single-phase winding, the generated voltage is If the coils are reconnected to realize three-phase star-connected winding, the generated phase voltage is Assuming full pitch, single-layer winding, the ratio is

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ESE & GATE EE Electrical Machines

Mar 14ESE & GATE EE