D

Reg No.:

06000EE311122001 Pages: 3

Name:

APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY

Fifth Semester B.Tech Degree Examination (Regular and Supplementary), December 2020

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Course Code: EE311

Course Name: ELECTRICAL DRIVES & CONTROL FOR AUTOMATION
Max. Marks: 100

PARTA

Answer any three full questions, each carries 10 marks.
A 4 pole lap wound d,c generator has 960 total number of turns. The useful flux
per pole is 0.09 Wb. The armature resistance is 0.05 Q. Calculate the terminal
voltage when running at 1000 r.p.m. if the armature current is 30 A.
What are the different methods of excitation in a d.c generator? Explain.
Explain about the main parts of a d.c. generator.
The Induced e.m.f. in a d.c. shunt generator on open circuit condition is given as
150%. When the machine is on load, the terminal voltage is 1۱42۷. Find the load
current if the field resistance is 20 Q and the armature resistance is 0.04 (2.
Ignore armature reaction.
What is armature reaction in 00 generator and what are its effects and how it can
be reduced.
Briefly explain the Internal and External characteristics of d.c .shunt and series
generators.
A 6-pole lap wound d.c. motor with 774 conductors. takes an armature current
of 100 A at 440V.The armature resistance 15 0.2Q. The flux per pole is 0.08
Wb. Calculate (i) the speed and (ii) Armature torque developed.
Explain the necessity of a starter for d.c.motors.
Explain the electrical and mechanical characteristics of ‏عل‎ shunt motor and d.c.
series motor.
Explain the load test of a d.c. shunt motor.
A 220 V series motor takes an armature current of 40A. The armature resistance

is 0.2Q and series field resistance is 0.06Q. Find the

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Duration: 3 Hours

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