Explain the advantages & disadvantages of Lap & Wave winding.
[7 marks]Explain the Direct-On-Line starter of induction motor with necessary wiring diagram.
[7 marks]Derive the necessary equation to calculate the resistance steps for D.C.Shunt Motor.
[7 marks]Explain the different types of Iron losses.
[7 marks]Determine the MMF required for the air gap of a machine having the following data. Core length=300 mm including 3 ducts of 10 mm width, pole arc=22 cm, slot pitch=6.0 cm, slot opening= 6 mm, flux per pole= 0.043 wb, length of air gap=0.5 cm, assume Carter’s co-efficient of 0.18 and 0.28 for opening/gap 1 & respectively.
[2 marks]What is the basic function of electromagnet? List out the different types of Electromagnet.
[7 marks]The starter of a 400 v dc series motor has 4 resistance section and the current limits during the starting are 100 Aand 150 A. The resistance of the machine is 0.2Ω and between these current limits the flux changes by 9%. Determine the resistance of each section of starter.
[7 marks]Explain the importance of dummy coil and equalizer connections in case of d.c. winding.
[7 marks]Define Real & Apparent Flux Density.
[7 marks]What are the important factors while selecting the suitable size of conductor for industrial wiring?
[7 marks]List out the different types of material used in Residential wiring.
[7 marks]Explain the important basic equation in case of Electromagnet.
[7 marks]Explain the design procedure of 1-phase Small Transformer.
[7 marks]Define following with refer to D.C.Armature Winding (1) Front Pitch (2) Back-Pitch (3) Commutator Pitch (4) Pole-Pitch
[7 marks]Explain the design steps of welding transformer.
[7 marks]Differentiate between integral and fractional slot winding & state advantages of fractional slot winding.
[7 marks]Draw the Electrical wiring diagram of 7-hp induction motor considering the star- delta starter.
[7 marks]