LESS0N 2: 3-
PHASE TRANSFORMERS
TOTAL WEIGHTAGE: 16M
SHORTS QUESTIONS: 2
ESSAY QUESTIONS: 1
SHORT QUESTIONS
1. STATE THE FUCTIONS OF FOLLOWING PARTS OF 3-Ø POWER TRANSFORMER
A) BUCHHOLZ RELAY
B) SILICA GEL
2. STATE THE APPLIATIONS OF i) DELTA-DELTA ii) DELTA –STAR CONNECTED 3-Ø TRANSORMER.
3. STATE THE ADVANTAGES OF AUTO TRANSFORMERS.
4. STATE THE CONDITIONS OF PARALLEL OPERATION OF 3 -Ø POWER TRANSFORMER.
EXTRA QUESTIONS
5. STATE THE APPLICATIONS OF AUTO TRANSFORMERS.
6. STATE THE ADVANTAGES AND DISADVANTAGES AND USES OF AUTO TRANSFORMERS.
7. STATE ANY THREE ADVANTAGES OF 3-Ø TRANSFORMER OVER BANK OF SINGLE PHASE
TRANSFORMER.
ESSAYS QUESTIONS
8. WHAT IS THE NECESSITY OF COOLING TRANSFORMER?
(Or)
EXPLAIN ANY TWO METHODS OF COOLING OF POWER TRANSFORMER IN BRIEF.
9. STATE THE LOCATION AND FUNCTION OF BREATHER,CONSERVATOR,OIL LEVEL INDICATOR AND
EXPLOSION VENT IN A TRANSFORMER,
EXTRA QUESTIONS
10. WHAT IS THE NECESSITY OF TAP CHANGING IN TRANSFORMER
(or)
EXPLAIN ON LOAD AND OF LOAD OF TAP CHANGING TRANSFORMERS.
11. DERIVE THE CONDITION FOR MAXIMUM EFFICIENCY OF THE TRANSFORMER.
LESSION 3: ALTERNATORS
12.
13.
14.
15.
16.
17.
TOTAL MARKS: 26M
SHORTS QUESTIONS: 3
ESSAYS QUESTIONS: 2
SHORT QUESTIONS
DRAW A NEAT VECTOR DIAGRAM OF AN ALTERNATOR ON LOAD AT LAGGING POWER FACTOR’
DEFINE VOLTAGE REGULATION OF AN ALTERNATOR.
DEFINE SYNCHRONUS IMPEDENCE OF AN ALTERNATOR. (or) SYNCHRONUS REACTANCE.
STATE OR WRITE THE ADVANTAGES OF STATIONARY ARMATURE OVER ROTA ING TYPE
ARMATURE OF AN ALTERNATOR.
COMPARE THE SALIENT TYPE ANND NON SALIENT POLE TYPE ALTERNATOR IN ANY FIVE ASPECTS
STATE THE CAUSES OF TERMINAL VOLTAGE VARIATIONS ON LOADED ALTERNATOR.
EXTRA QUESTIONS
18. EXPLAIN WORKING PRINCIPLE OF ALTERNATOR.
19. DEFINE SHORT PITCH WINDING AND ADVANTAGES.
20. DEFINE i) PITCH FACTOR
ii) BREADTH FACTOR.
ESSAY QUESTIONS
21. a) DEFINE VOLTAGE REGULATION OF AN ALTERNATOR.
b) EXPLAIN THE PROCEDURE FOR DETERMINING THE VOLTAGE REGULATION OF AN
ALTERNATOR BY USING SYNCHRONUS IMPEDENCE METHOD WITH NEAT DIAGRAM.
22. a) DEFINE PITCH FACTOR IN AN ALTERNATOR.DERIVE EXPRESSION FOR PITCH FACTOR WITH
VECTOR DIAGRAM.
b) EXPRESS VARIOUS TYPES OF EXCITERS USED IN ALTERNATORS.
23. DERIVE THE EMF EQUATION OF AN ALTERNATOR.
ALL METHODS OF PROBLEMS
LESSON 4: PARALLEL
OPERATION OF ALTERNATORS
TOTAL MARKS: 13M
SHORT QUESTIONS: 1
ESSAY QUESTIONS: 1
SHORT QUESTIONS
24. WHAT IS THE NECESSITY FOR PARALLEL OPERATION OF ALTERNATORS?
25. EXPLAIN THE NEED OF THE PARALLEL OPERATION OF ALTERNATORS.
26. STATE THE CONDITIONS FOR SYNCHRONIZATION OF 3-Ø ALTERNATORS.
EXTRA QUESTIONS
27. WRITE THE CONDITIONS FOR OPERATING THE ALTERNATOR IN PARALLEL.
28. DEFINE SYNCHRONIZATION.
ESSAY QUESTIONS
29. EXPPLAIN THE PROCEDURE OF SYNCHRONIZATION OF ALTERNATOR BY USING DARK AND BRIGHT
LAMP METHOD WITH A NEAT SKETCH.
30. ALL METHODS OF PROBLEMS.