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06000EE311122001

(i) output power and the (ii) efficiency if the copper losses are equal to Iron and
friction losses.
List the different losses in a d.c. machine and derive the condition for maximum
efficiency.
PART ‏تا‎

Answer any three full questions, each carries 10 marks.
Define all day efficiency of a transformer.
A 60 kVA transformer has iron loss of 550W and full load copper loss of
800W.Find the efficiency corresponds to full load, if the full load power factor
is 0.7 lagging.
Explain open circuit and short circuit test of a single-phase transformer with
suitable diagrams.
Derive the e.m.f equation of a transformer.
Draw the equivalent circuit of a loaded Transformer referred to primary side
and also give the necessary equations.
Explain the constructional details of three phase Induction motor.
Derive the Torque equation for a three-phase induction motor.
Define the term slip of an induction motor and calculate the percentage slip of a
4 pole Induction motor supplied by a 415 V, 50Hz supply, running at 1440
r.p.m.
Explain the tests to be conducted on a 3-phase induction motor for the
development of circle diagram.
Describe autotransformer starting of a three phase Induction motor with neat
sketches.

PART C

Answer any four full questions, each carries 10 marks.
Explain the working principle of synchronous motor.
With neat diagram explain the working of capacitor start single phase induction
motor.
Describe synchronous impedance related to an alternator.

Explain the e.m.f. method of determining the regulation of an alternator.

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