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Define real and apparent flux densities in the tooth of d.c. machine armature and give the difference between them. Also derive the relation between them.
Justify the use of dummy coils and equalizer connections in DC armature windings.
Find the Front pitch, back pitch, winding pitch and commutator pitch for a simplex wave wound 13 slots, 4-pole d.c armature with 13 commutator segments. Draw the winding diagram in developed form. Also draw the sequence diagram to indicate the position of brushes. Assume number of coil sides per slot = 2.
Design a mush winding for 3-phase, 4-pole and 24 slots stator. Also show winding diagram for phase R only.
Describe how to calculate the magnetizing current in a machine with distributed winding.
Write short note on use of field regulator in case of DC motor and DC generator.
Determine the MMF required for the airgap of a machine with open slots from the following particulars: Slot pitch= 4.3 cm, Slot opening= 2.1 cm, Gross length of core= 48 cm, Pole arc= 18 cm, Airgap length= 0.6 cm, Flux per pole= 0.056 wb, No. of ventilating ducts= 8, Width of each ventilating ducts= 1.2 cm. Slot opening/Gap length 1 2 3 3.4 4 Carter’s coefficient 0.15 0.28 0.37 0.41 0.43
Give the definition of the following terms with respect to load assessment:
Compare mush winding and double layer winding for three phase AC machine.
Calculate the steps in a 4-section rotor resistance starter for a 3-phase slip ring induction motor having full load slip 2.5%. Maximum starting current = full load current and rotor resistance/phase=0.02Ω. Neglect rotor reactance.
Explain the working of auto transformer starter with neat sketch for squirrel cage induction motor.
List various methods for calculating mmf required for the tapered teeth and explain any one method in detail.
Questions repeat across sessions. Working through two or three papers shows you which topics GTU asks most.
BE Electrical
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Official Gujarat Technological University (GTU) examination paper for Element of Electrical Design (Summer 2025, B.E. · Electrical Engineering, Sem 6). Features complete 70-mark regular & remedial examination pattern, official marking distribution across all 5 questions, and direct 1-click official PDF download.
Transcribed for student exam preparation from Gujarat Technological University official examination archives. Questions, syllabus guidelines, and curriculum marking schemes remain the intellectual property of Gujarat Technological University.
3160918 Element of Electrical Design
Official GTU PDF · Summer 2025
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