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GATE 2022 : Electrical Machine Quiz 1

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Question 1

Which of the following angle does the stator windings are geometrically divided?

Question 2

Which of the following materials are used for induction motor shaft?

Question 3

In the magnetic circuit shown in figure, the areas of cross-section of limbs B and C are respectively 0.01 m2 and 0.02 m2. Air gaps of lengths 1.0 mm and 2.0 mm respectively cut in the limbs B and C . If the magnetic medium can be assumed to have infinite permeability and flux in limb B is 1.0 Wb, the flux in limb A is

Question 4

A cast electromagnet has an air gap of length 2 mm and an iron path of length 30 cm. Find the number of ampere-turns necessary to produce a flux density of 0.8 Wb/m2 in the gap. Neglect leakage and fringing. (For 0.8 Wb/m2 cast steel requires 750 AT/m).

Question 5

An iron ring of mean length 50 cm has an air gap of 1 mm and a winding of 200 turns. If the permeability of the iron is 300 when a current of 1 A follows through coil, find the flux density in m Wb/m2

Question 6

A circular iron core has an air gap cut in it and is excited by-passing direct current through a coil wound on it. The magnetic energy stored in the air gap and the iron core is
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