B.TECH - Semester 8 electrical machine design Question Paper 2021 (feb)
Practice authentic previous year university questions for better exam preparation.
Sample Questions
- 802 : ELECTRICAL MACHINE DESIGN (E) (2013 Scheme) Time : 3 Hours Max. Marks : 100 PART - A Answer all questions, Each question carries 4 marks.
- Derive the output equation of a single phase transformer.
- What are the factors to be considered while selecting the number of armature slots of a dc machine?
- What are the effects of SCR on the performance of an Alternator?
- What are the factors affecting the choice of specific magnetic loading of a three phase induction machines?
- Explain hybrid techniques for electrical machine design. Answer any one full questions from each module.
- (a) Explain different types of enclosures used in electrical machines.
- (b) Determine the dimensions of the core, the number of turns and the cross sectional area of conductors in the primary and secondary windings of a $100 \mathrm{kVA}, 2200 / 480 \mathrm{~V}$ single phase core type transformer to operate at a frequenc...
- (a) Explain different types of ventilation used in electrical machines.
- (b) A $1000 \mathrm{kVA}, 6600 / 440 \mathrm{~V}, 50 \mathrm{~Hz}$, three phase, delta/star, core type oil immersed natural cooled transformer have the following design data: Distance between centers of adjacent limbs $=0.47 \mathrm{~m}$ Outer diam...
- (a) A $250 \mathrm{~kW}, 500 \mathrm{~V}, 600 \mathrm{rpm}$ de generator is built with an armature diameter of 0.75 m and a core length of 0.3 m . The lap connected armature has 720 conductors. Using the data obtained from this machine, determine the...
- (b) A $5 \mathrm{~kW}, 250 \mathrm{~V}, 4$ pole, 1500 rpm shunt generator is designed to have a square pole face. The specific loadings are $0.42 \mathrm{~Wb} / \mathrm{m}^{2}$ and 15000A. Full load efficiency is 0.87 , ratio of pole arc to pole pitc...
- (a) The full load terminal voltage of a 50 kW .4 pole, 600 rpm , DC shunt generator is 220 V . If the maximum air gap density is $0.83 \mathrm{~Wb} / \mathrm{m}^{2}$ and the armature ampere conductors per metre 30000 , Calculate suitable dimensions o...
- (b) A $350 \mathrm{~kW}, 500 \mathrm{~V}, 450 \mathrm{rpm}, 6$ pole dc generator is built with an armature diameter of 0.87 m and a core length of 0.32 m . The lap wound armature has 660 conductors. Calculate the specific loadings.
- (a) A $1000 \mathrm{kVA}, 3.3 \mathrm{kV} 50 \mathrm{~Hz} 300 \mathrm{rpm}$ three phase alternator has 180 slots with 5 conductors per slot. Single layer winding with full pitch coils is used. The winding is star connected with one circuit per phase....
- (b) What are the factors affecting the choice of specific magnetic loading of an alternator? 11．（a）Determine the main dimensions of a $75 \mathrm{MVA}, 13.8 \mathrm{kV}, 50 \mathrm{~Hz}, 62.5 \mathrm{rpm}$ ， 3 phase star connected alternator．Also fi...