Derive output equation for 3-Phase Induction motor. Explain factors affecting size of Induction motor.
[7 marks]Discuss the factors for estimating the length of the air-gap of 3-Phase Induction motor.
[7 marks]Define SCR of a synchronous machine. Discuss the importance of SCR in the design of synchronous machine.
[7 marks]Describe about shape and sizes of rotor bars in 3-phase induction motor.
[7 marks]What is dispersion coefficient ? Explain the effect of it on power factor?
[7 marks]Explain design procedure for stator of single phase Induction Motor.
[7 marks]Prove that the output of single phase machine is two third of that of a three phase machine.
[7 marks]Explain design of capacitance for maximum torque in single phase Induction Motor.
[7 marks]Calculate main dimensions and size of conductor of 5 HP, 400 V, 3-phase, 50 Hz, 1500 rpm squirrel cage induction motor. Star-delta starter is used for starting. Average flux density in gap is 0.46 wb/m2, ampere-conductor/meter is 22000, current density is 4, full load efficiency is 83% and full load power factor is 0.84 lagging.
[7 marks]Discuss the factors affecting the choice of specific magnetic loading for synchronous machine.
[7 marks]Discuss factors affecting selection of no. of armature slots in synchronous machine.
[7 marks]What is the role of damper winding in (i) synchronous generator and (ii) synchronous motor?
[7 marks]Write the steps with equations for rotor design of an synchronous machine.
[7 marks]Describe no load current and short circuit current calculation in 3-Phase Induction motor.
[7 marks]How you will estimate MMF required for various parts of magnetic circuit of Synchronous Machines ?
[7 marks]Explain determination of Direct and Quadrature axis reactance of Alternator.
[7 marks]Discuss the factors for choice of specific electric loading for 3-Phase Induction motor.
[7 marks]