EE8401 Important 16 Mark Questions ELECTRICAL MACHINES 2
EE8401 Important 16 Mark Questions Electrical Machines 2 Regulation 2017 Anna University free download. Electrical Machines 2 Important 16 Mark Questions EE8401 pdf free download.
Sample EE8401 Important 16 Mark Questions Electrical Machines 2
1. Describe construction and working of an alternator. (16)
2. i) Derive the emf equation of an alternator.(10)
ii) Explain pitch factor and distribution factor.(6) (EE8401 Important 16 Mark Questions Electrical Machines 2)
3. Explain the determination of direct(d) and quadrature(q) axis synchronous reactance using
slip test.(16) (EE8401 Important 16 Mark Questions Electrical Machines 2)
4. A 3 phase, 6 pole, star-connected alternator revolves at 1000 r.p.m. The stator has 90 slots
and 8 conductors per slot. The flux per pole is 0.05 wb (sinusoidally distributed).
Calculate the voltage generated by the machine if the winding factor is 0.96.
5. Elaborate the discussion on capability curve with its boundaries of synchronous machine. (EE8401 Important 16 Mark Questions Electrical Machines 2)
6. Discuss the parallel operation of two alternators with identical speed/load
Characteristics
7. A 3300V, 3phase star connected alternator has a full load current of 100A. On short circuit a
field current of 5A was necessary to produce full load current. The emf on open circuit for
the same excitation was 900V. The armature resistance was 0.8Ω/phase. Determine the full
load voltage regulation for (1)0.8pf lagging (2)0.8pf leading. (EE8401 Important 16 Mark Questions Electrical Machines 2)
8. A 3 phase, 50Hz star connected 2000kA for a certain field excitation. With the same
excitation, the open circuit voltage was 900V. The resistance between a pair of terminals was
0.12 Ω. Find the full load regulation at UPF and 0.8pf lagging. Draw the phasor diagrams. (EE8401 Important 16 Mark Questions Electrical Machines 2)
9. What are the methods of determining regulation of alternator? Discuss each briefly. (EE8401 Important 16 Mark Questions Electrical Machines 2)
10. Two alternators working in parallel supply the following loads (i) lighting load of 500kW,
(ii) 1000kW at 0.9pf, (iii) 500kW at 0.9pf lead, (iv) 800kW at 0.8 lag. One alternator is
supplying 1500kW at 0.95pf lagging. Calculate the load on the other machines. (EE8401 Important 16 Mark Questions Electrical Machines 2)
| Subject name | Electrical Machines 2 |
| Short Name | EM 2 |
| Semester | 4 |
| Subject Code | EE8401 |
| Regulation | 2017 regulation |
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