Mg university B.tech syllabus S5 Electrical & Electronics
D.C. Machines
1. Study of 3-point and 4-point starters for D.C machines – mode of connection
– protective arrangements
2. OCC of self and separately excited D.C machines – critical resistances of
various speeds. Voltage built-up with a given field circuit resistance. Critical
speed for a given field circuit resistance
3. Load test on shunt and compound generator – deduce external, internal and
armature reaction characteristics. Find load critical resistance.
4. Characteristics of D.C series machine as motor and generator.
5. Swineburne’s and retardation test on D.C machines.
6. Brake test on D.C shunt, compound motors and determination o
characteristics.
7. Hopkinson’s test on a pair of D.C machines.
8. Separation of losses in a D.C machine.
9. Field’s test on D.C machine.
Transformers
10. Polarity, transformation ratio, tests of single phase units and star-delta
combination for 3-phase operation.
11. O.C and S.C tests on single phase transformers – calculation of
performance using equivalent circuit – efficiency, regulation at unity, lagging
and leading power factors. Verification by direct loading.
12. Sumpner’s test on single phase transformers.
13. O.C and S.C tests on three-phase transformers.
14. Scott connection – check for 2 phase – predetermination of primary
current for balanced and unbalanced secondary currents – verification by
actual loading.
15. Parallel operation and load sharing of two single phase dissimilar
transformers.
16. Separation of losses of single phase transformer into Hysterisis and eddy
current losses.
17. Paralleling of Three-phase transformers and load sharing.
18. Auto transformer – equivalent circuit.
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