Code No. 2129 /O FACULTY OF ENGINEERING B.E. 3/4 (E&EE) II Semester (Old) Examination, April / May 2013 Subject: Electrical Machinery – III Time: 3 Hours
Max.Marks: 75
Note : Answer all questions from Part A. Answer any Five questions from Part B. PART – A (10x2.5 = 25 Marks) 1. What is the effect of armature reaction in synchronous generator for leading and lagging p.f. loads?
(2)
2. List various parts with materials used for a synchronous M/C.
(2)
3. Why synchronous impedance method of finding voltage regulation is called pessimistic method?
(3)
4. What are the conditions to be satisfied for parallel operation of alternators?
(2)
5. What is the use of damper winding in synchronous motor and synchronous generator?
(3)
6. What are inverted v-curves?
(2)
7. What are transient and sub-transient periods?
(3)
8. What is drag cup rotor?
(2)
9. What is pole shading and its effect?
(3)
10. What are the advantages of compensation of AC series motor?
(3)
PART – B (50 Marks) 11. A 3-phase star connected alternator is rated at 1600 kVA, 13.5 kV. The effective armature resistance and synchronous reactance are 1.5Ω and 30 Ω per phase, respectively. Find regulation for a load of 1280 kW, rated voltage and p.f. of (a) 0.78 leading (b) 0.8 lagging.
(10)
12. A 50 Hz, 30-phase, 480 V, delta connected salient pole synchronous generator has xd = 0.1 Ω and xq = 0.075 Ω. The generator is supplying 1200 A at 0.8 p.f. lagging. Find the excitation emf. Neglect armature resistance.
(10)
13. A 3300 V, delta connected synchronous motor has xs = 18 Ω/phase. It operates at a leading p.f. of 0.707 when drawing 800 kW from mains. Find excitation emf.
(10)
14. Draw and explain the characteristics of two alternators working in parallel. What is the effect of change of excitation and change in mechanical power input on load sharing?
(10)
15. Draw the phasor diagram of a salient pole synchronous motor. Derive the power-angle characteristics.
(10)
16. Explain in detail switched reluctance motor operation and its control and characteristics.
(10)
17. Write short notes on: (a) Permanent magnet DC motor. (b) Linear induction motor.
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