locomotive' Draw the lunctional schematic of ac electric traction systems ? 10. What are the various types of motors used in
9.
PART_B (Answer any one full question from each Module)'
Module-1 supplied 200A at
running at l OOO rpm 11. a) A separately excited generator, when. when the-speed drops to 800 rpm if l, is 125V. What wirr o" tnEloio "uirent armature resistance = 0'04 o and brush drop =
unchanged ? Assume b) Describe the open-circuit characteristics of dc
2V'
generators'
10 10
P.T.O.
B-6124 '12.
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a)
Derive an expression lor torque ol a dc motor. Hence draw torque vs current characteristics of dc shunt and dc series motors. b) Describe alltypes of losses in a shunt and compound wound generator. state which comprise constant loss. 10
Module-2 13. a) Explain briefly the operation of transformer and sketch phasor diagram on no-load.
b) Find all-day efficiency of a transformer having maximum efficiency ol gg% at 5 kVA at unity power factor and loaded as follows 12 hours - 2 kW at 0 5 pf tag 1
6 hours
-
6 hours
- at no-load.
:
10
12 kW at 0.8 pf tag
14. a) Discuss wilh circuit diagram any two method of starting a synchronous motor. b) Explain the constructional details of a squirrel cage and a slip-ring rotor induction motor. Compare merits and demerits of each type of motor.
Module-3 15. a) Derive emf equation ol ahernator and explain coil span factor and distribution factor. b) Explain the regulation of an alternator by emf method. 16. a) Explain V curves as applied to synchronous motors. b) Describe about stepper motorand also its advanrages, disadvantages and applications.
10 10
I 12
Module-4 17. a) Mention the various system of power supply in traction. b) Discuss the speed control methods of traction motors.
15
18. a) Explain the various braking methods used in traction motors.
15
b) Describe about any one type of electric welding.
b) Explain the regulation of an alternator by emf method. 16. a) Explain V curves as applied to synchronous motors. b) Describe about stepper motorand also its ...
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tain TI. Whenever two worm flows wi and wj are consid- ered together, a signature containing TI will be generated. Whereas, whenever two fake anomalous ...
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[19] G. C. Necula. Translation validation for an optimizing com- piler. In PLDI, pages 83â94, 2000. [20] V. Paxson. flex - A fast scanner generator., 2.5 edition,.
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May 2, 2002 - achieve the desired DC voltage for application to the load, such as the motor 19. ..... testing the sign of Vq in tests 117â119 of FIG. 8; i.e., d[3=âd[3 if ..... regeneration, such as for driving poWer tools, or in other applicatio
Jun 3, 2010 - ... cycle is DC offset-free. 46 Claims, 9 Drawing Sheets .... mode of operation of a notebook computer, for example. A. PFM converter includes a ...
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