1 Separation of transformer core losses and to determine the hystersis and eddy current
losses at rated voltage and frequency.
2 To plot the O.C.C. & S.C.C. of an alternator and to determine its regulation by
synchronous impedance method.
3 To synchronize an alternator across the infinite bus (RSEB) & summarize the effects of
variation of excitation on load sharing.
4 To plot the V-curve for a synchronous motor for different values of loads.
5 To perform sumpner’s back-to-back test on 3 phase transformers, find its efficiency &
parameters for its equivalent circuits.
6 To perform the heat run test on a delta/delta connected 3-phase transformer and
determine the parameters for its equivalent circuit.
7 To perform no load and blocked rotor test on a 3 phase induction motor and to
determine the parameters of its equivalent circuits. Draw the circle diagram and compute the
following (i) Max. Torque (ii) Current (iii) slip (iv) p.f. (v) Efficiency.
8 To perform the load test on a 3-phase induction motor and determine its performance
characteristics (a) Speed vs load curve (b) p.f. vs load curve (c) Efficiency vs load curve (d)
Speed vs torque curve
9 Determination of losses and efficiency of an alternator.
10 To find Xd and Xq of a salient pole synchronous machine by slip test.
Units: II-SCR:
Construction and characteristics, specification and ratings, pulse
transformer, optical isolators, methods of turn on: R, RC, UJT relaxation oscillator,
Rating extension by series and parallel connections, string efficiency. Protection of
SCRProtection against over voltage, over current, dv/dt, di/dt, Gate protection.
Units: III-Converters-I:
Single Phase half & full wave converters with RL load, Single
phase dual converters, Three phase half wave converters, Three phase full converters with
RL load, Three phase dual converters.
Units: IV-Converters-II:
Single and three-phase semi converters with RL load. Power Factor
Improvement-Extinction angle control, symmetrical angle control, pulse width modulation
control and sinusoidal pulse width modulation control. Inversion operation. Effect of load
and source impedances.
Units: V-DC-DC Converters: Choppers:
Step Up/Down Copper, Chopper
Configurations, analysis of type A Chopper Commutation of Choppers. Switched Mode
Regulators-buck, boost, buckboost and cuk regulator.