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Old April 25th, 2014, 01:29 PM
Default Cochin University IT III Sem Electrical Technology Exam Old Question Papers

Will you please share the previous year question paper of Cochin University of Information Technology - 3rd Semester Electrical Technology Exam??
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Cochin University Of Science & Technology - Kerala, Cochin
Department of Electronics, Cochin University of Science and Technology, Cochin

Old April 25th, 2014, 06:05 PM
Sashwat's Avatar
Super Moderator
Join Date: Jun 2011
Default Re: Cochin University IT III Sem Electrical Technology Exam Old Question Papers

As per your request here I am sharing the previous year question paper of Cochin University of Information Technology - 3rd Semester Electrical Technology Exam

Develop the exact equivalent circuit of a transformer. From this derive the approximate equivalent circuit referred to primary. (10)

A 4001200V single phase transformer is supplying a load of 50A at a power factor of
0.866 lagging. The no load current is 2A at 0.208 pf lagging. Calculate the primary .
current and primary power factor. (10)

Explain the working of a current transformer. What are the precautions to be observed while using CT for current measurement? (6)

What are the advantages of using instrument transformers? (4)

The maximum efficiency occurs at unity power factor and at 1.2 times full load current.

Determine the full load efficiency a 0.8 power factor lagging. Also calculate the
maximum efficiency. (10)

What is armature reaction? Discuss the effects of armature reaction. How can it be
reduced? 00)

In a 220V compound generator the resistances of armature, shunt and series windings
are 0. la, 50R and 0.06C2 respectively. The load consists of 220 lamps each
rated at lOOW and 220V. Find the induced e.m.f. When the machine is connected
as long shunt and short shunt. Allow a total brush drop of 2 volts. (10)

What is the need of s h r in DC motor. With a neat sketch explain the working of a
3 point starter. (10)

A 500V shunt motor takes a total current of 5A when running unloaded. The
resistance of armature is 0.25 and the field resistance is 125 a. Calculate the output
and efficiency when the motor is loaded and taking a current of 100A. Also find the
percentage change in speed f?om no load to full load. (10)

Define voltage regulation of an alternator. (2)

What are the factors that cause a change of the alternator terminal voltage as it is
loaded? Explain. (8)

Find the no load phase and line voltage of a star connected 3 phase, 6 pole alternator
which runs at 1200 rpm, having flux per pole of 0.2wb sinusoidally distributed. Its
stator has 54 slots having double layer winding. Each coil has 6 tums and the wil is
chorded by one slot. (10)

Cochin University of Science And Technology
Thrikkakara, South Kalamassery, Cochin, Kerala 682022 ‎
0484 257 7550 ‎


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