Design of Electrical Machines

	Question
0	What are the desired properties of Transformer Oil? This question has 0 answers so far.
0	Explain the CMR and short time rating of machines. This question has 0 answers so far.
0	Make a detailed design that of a transformer having the following specifications giving the complete details of the magnetic frame, low voltage and high voltage winding, performance characteristic and the tank. 2000 KVA, 1100/440 V, 50 Hz, 3-phase, delta/star, core type, power class, oil immersed, self-cooled, temperature rise not to exceed 50°C. Total losses not be exceed 1.5% of the rated output. No-load current to be within 1% of the rated current percentage impedance to be within 6 to 7%. This question has 0 answers so far.
0	Explain the effect of design parameters on the performance of a transformer. This question has 0 answers so far.
0	What are the advantages and disadvantages of using comparatively higher flux density in the core? This question has 0 answers so far.
0	What are the modes of heat dissipation in Electrical Machines? This question has 0 answers so far.
0	What are the factors on which iron losses occurring in d.c. machine depends. This question has 0 answers so far.
0	Discuss the factors that influence the length of air gap in a D.C.machine. This question has 0 answers so far.
0	When the performance was calculated at the design stage of a poly-phase induction motor, it was found to give a poor power factor, explain why? Also discuss various modifications, which can be made in the design for improving its p.f. This question has 0 answers so far.
0	Design the stator of a 3 phase, 20000 kVA, 11 kV, 3000 rpm, 50 Hz,turbo-alternator, power factor 0.8 lagging, This question has 0 answers so far.
0	Describe the Potier triangle method for calculating the synchronous reactance. This question has 0 answers so far.
0	Discuss a method of estimating the reluctance of the air gap in the case of slotted armature. This question has 0 answers so far.
0	Explain the methods of cooling of turbo alternators. This question has 0 answers so far.