02000EE216052001
Pages: 2

Reg No.: Name:

Max. Marks: 100

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APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY

Fourth semester B.Tech examinations (S), September 2020

Course Code: EE216
Course Name: ELECTRICAL ENGINEERING (AE)

PARTA

Answer any two full questions. Each question carries 15 marks
Explain, with diagrams the procedure to find the equivalent circuit parameters of a
given single phase transformer with respect to the h v side.
A 200 kVA, 6600/400 V, 50 Hz, single phase transformer has 80 turns on the
secondary. Calculate (1) The approximate number of primary turns and (ii) the
maximum value of flux in the core
Derive the EMF equation of a DC generator.
Explain armature reaction and its effects on the performance of a DC generator.
Compare autotransformers with ordinary transformers.
Draw & explain the no load phasor diagram of a single phase transformer.
Explain inter poles in dc machines with diagram? Why they are needed in a DC
machine?

PART ‏تا‎

Answer any two full questions. Each question carries 15 marks
What is the significance of back EMF in the working of a DC motor?
Explain the working of a three point starter with necessary diagram.
Explain any two starting methods of a three phase squirrel cage induction motor.
Derive the EMF equation of an alternator with derivations of pitch factor and
distribution factor
Explain Swinburne’s test on DC shunt motor. Write expression to find constant loss
and list the advantages of the test.
A three phase star connected induction motor has 2 poles and is connected to 400V,

50Hz supply. Calculate i) synchronous speed ii) the actual rotor speed iii) rotor

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Duration: 3 Hours