Basic Electronics and Electrical Engineering: Chapter 4: Synchronous Machines
Synchronous Machines: Exercise Problems
Basic Electronics and Electrical Engineering: Chapter 4: Synchronous Machines : Exercise Problems
Basic Electronics and Electrical Engineering
Chapter 4: Synchronous Machines
EXERCISE
PROBLEMS
1. The effective
resistance of a 2200 V, 50 Hz, 440 kVA, 1 phase alternator is 0.5 Ω. On short
circuit a field current of 40 A, gives the full load current of 200 A. The
electromotive force on open circuit with same field excitation is 1160 V. Calculate
the synchronous impedance and reactance. [Ans:
XS = 5.77Ω]
2. A 3 phase, 12 pole
alternator is coupled to an engine running at 500 rpm. The alternator supplies
an induction motor which has a full load speed of 1455 rpm. Find the slip the
number of poles of the induction motor. [Ans:
P=4]
3. Calculate the pitch
factor if winding has 36 slots, 4 poles and coil span of 1 to 8. [Ans: Kc=0.9848]
4. A 1500 KVA, 6600 V,
3 phase, star connected alternator has a resistance of 0.6 Ω per phase and
synchronous reactance of 5 Ω per phase. Calculate the full load regulation at
0.8 p.f lag and lead. [Ans: % Regulation
= 12.67%, Regulation = ‒ 7.45%]
5. Calculate the
distribution factor for a 36 ‒ slots, 4 ‒ pole, single‒layer three phase
winding. [Ans: Kd=0.96]
6. A 3 phase 12 pole
synchronous machine has a star connected full pitch winding with 108 slots and
12 conductors per slot. The flux per pole is 50 mWb and sine distributed. The
speed of rotation is 500 rpm. Find the frequency, phase emf and the line emf. [Ans: Eph=2301.7 V, EL
= 3986.65 V]
Basic Electronics and Electrical Engineering: Chapter 4: Synchronous Machines : Tag: Basic Engineering : - Synchronous Machines: Exercise Problems
Basic Electronics and Electrical Engineering: Chapter 4: Synchronous Machines
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