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Reg No.:_ Name:
APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY
FIFTH SEMESTER B.TECH DEGREE EXAMINATION(S), MAY 2019
Course Code: EE311
Course Name: ELECTRICAL DRIVES & CONTROL FOR AUTOMATION
Max. Marks: 100 Duration: 3 Hours

PARTA
Answer any three full questions, each carries 10 marks. Marks
1 a) A 6 pole DC shunt generator has 780 wave connected armature conductors 320 (4)
running at 600 r.p.m supplies a load of 13Q resistance at a terminal voltage of
240V.The armature resistance is 0.3Q and field resistance is 260Q.Calculate the

i)induced EMF ii)Flux per pole

b) Derive the e.m.f equation of a 60 generator (4)

௦) Explain the working principle of a ‏عل‎ generator ( 2)
2 a) What is armature reaction in a ‏ع0‎ generator what are its effects (6)

b) Explain the different characteristics of self-excited dc shunt generator (4)
3 a) What are the applications of shunt ,series and compound motors (3)

b) A 6 pole 600V wave connected shunt motor has 1200 armature conductors and _ (7)
useful flux per pole of 22mWb. The armature and field resistances are 0.75 Q
and 250Q respectively. Calculate the speed and armature torque developed by
the motor when it draws 25A from the supply mains. If the magnetic and
mechanical losses amount to 920watt.find the i)shaft torque ii)output power in
KW and iii) efficiency at this load
4 9) What is the purpose of using starter in a dc motor (2)
b) Explain the different characteristics of de shunt motor, series motor and (8)
compound motor.
PART B
Answer any three full questions, each carries 10 marks.
5 9) Explain with diagram the principle of operation of a single phase transformer (4)
b) Explain with diagram the working of potential transformer and current (6)

transformer

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