EE8401 Question Paper ELECTRICAL MACHINES 2
EE8401 Question Paper Electrical Machines 2 Regulation 2017 Anna University free download. Electrical Machines 2 Question Paper EE8401 pdf free download.
Sample EE8401 Question Paper Electrical Machines 2:
1. (i) Define armature reaction and explain the effect of
armature r e a c t i o n on different power factor loads
of synchronous generators. (6) BTL 1 Remember
(ii) Derive the E . M . F . Equation of an alternator. EE8401 Question Paper Electrical Machines 2
2. (D7e)scribe a method of determining direct and quadrature
axis reactance of salient pole alternator. (13) BTL 1 Remember
3. (i) Explain with Phasor diagrams, the capability curve of
synchronous generator. (6)
BTL 4 Analyze EE8401 Question Paper Electrical Machines 2
(ii) A 3 Phase, 8 Pole, 750 rpm Star connected alternator as
72 slots on the armature. Each slot as 12 conductors and
winding is short chorded by 2 slots. The flux per pole
0.06Wb. Find induced EMF between Lines. (7) EE8401 Question Paper Electrical Machines 2
4. (i) A 3Phase star connected salient pole synchronous
generator id driven at a speed near synchronous with field
circuit open, the stator is supplied from balanced 3 Phase
supply. Voltmeter connected across the line gave minimum
and maximum readings of 2800 Volts and 2820 Volts. The
Line current fluctuated between 360A and 275A. Find the
direct and quadrature axis reactance per phase. Neglect
armature resistance. (5)
BTL 1 Remember EE8401 Question Paper Electrical Machines 2
(ii) Examine the given 50kVA, Y-connected, 440V, 3-
phase, 50Hz alternator, has the effective armature
resistance is 0.25Ω/phase. The synchronous reactance
is 3.2Ω/phase and leakage reactance is 0.5Ω/phase.
Determine at rated load at unity p owe r factor: a)
Internal E.M.F. Ea b) no load E.M.F. Eo c) percentage
regulation on full load d) value of synchronous reactance
which replaces armature reaction. (8) EE8401 Question Paper Electrical Machines 2
5. Describe the parallel operation of three phase alternators
with help of a neat diagram. (13) BTL 1 Remember
6. (i) Sketch and explain the open-circuit and short-circuit
characteristics of synchronous machines. (5)
BTL 4 Analyze EE8401 Question Paper Electrical Machines 2
(ii) Define the terms synchronous reactance and voltage
regulation of alternator. Explain synchronous impedance
method for determining regulation of an alternator. (8)
| Subject name | Electrical Machines 2 |
| Short Name | EM 2 |
| Semester | 4 |
| Subject Code | EE8401 |
| Regulation | 2017 regulation |
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