Electrical Machines

	Question
0	What are the pull-in torque and pull-out torque of synchronous motors? This question has 0 answers so far.
0	Write short notes on AC Servo Motor. This question has 0 answers so far.
0	Write short notes on Stepper Motor. This question has 0 answers so far.
0	What is double-revolving-field theory? On its basis draw torque-slip characteristics, explain the working of single-phase induction motor and state why single-phase induction motors are not self-starting. This question has 0 answers so far.
0	Explain and draw the neat phasor diagram of a synchronous motor at lagging power factor. Also derive the expressions for the power developed by synchronous motor. This question has 0 answers so far.
0	State the principle of working of synchronous motor and explain why it is not self-starting. Describe any two methods of its starting. This question has 0 answers so far.
0	What is synchronous reactance? How is it determined from OCC and SCC of an alternator? Calculate the saturated synchronous reactance of a 85 kVA synchronous machine which achieves its rated open-circuit voltage of 460 V at a field current 8.7A and which achieves the rated short-circuit current at field current of 11.2 A. This question has 0 answers so far.
0	Describe two-reactance theory for synchronous machines. Explain why it is not applicable for cylindrical rotor machines. Also explain and draw neat phasor diagram of an alternator based on it. This question has 0 answers so far.
0	Name the different methods of speed control of 3-phase inductions motors and describe the Kramer system of speed control with neat diagram. Also state its merits and demerits. This question has 0 answers so far.
0	Wa ttswer of the following: (10x2.5-25) Why does an induction motor not develop torque at synchronous speed? This question has 0 answers so far.
0	State the principle of working of a reluctance motor. This question has 0 answers so far.
0	What improvements should be made to run single-phase ac series motor satisfactorily? This question has 0 answers so far.
0	Why speed of single-phase induction motor is not reversed if connection of supply terminal are interchanged, but is reversed, if terminals of either main winding or auxiliary winding or auxiliary winding are interchanged? This question has 0 answers so far.
0	What is short circuit ratio SCR) of synchronous generator and what advantages are of high value of SCR? This question has 0 answers so far.
0	Define pitch factor and distribution factor of a synchronous machine. This question has 0 answers so far.
0	What are the advantages of rotating field and stationary armature of synchronous generator? This question has 0 answers so far.
0	What are cogging and crawling in squirrel cage induction motors.How can their effect be minimized? This question has 0 answers so far.
0	What is the frequency of the rotor current of a 415 V, 50 Hz, 4-pole induction motor running at 1440 rpm? This question has 0 answers so far.