1. What is difference between relay and main contacts?Ans: Relay is make or break switch which operates when a condition is satisfied. Main contacts is the only make or brake switch, it cannot have its own condition. (Pls confirm...)

2. As 2/e what checks to be done on shore connection box before dry dock?Ans: The shore terminal box should have earthing connection to connect ships earthing to the shore earthing. The phase sequence indicator is fitted to indicate correct supply phase sequence of the connection. It should have ckt breaker and fuses to protect the cable linking the connection box to the main switch board. 3. As 2/e what precaution u will take if shore supply is at 50 hZ and ship system is 60 Hz?Ans: The shore supply has to at 380V, as low freq high voltage supply will burn out the motor. Low freq and low Voltage is less damaging as it will alos heat the motor but slowly. 4. Types of ac motor, used where, differnce in construction of induction and synchronous motor

5. Safeties in Alternator

6. Maintenance of emergency generator

7. PID controller block diagram

8. Esb safeties as per solas

9. MCB safety

10. Motor short circuit and open circuit test

11. IP in electrical what does it signify and vlues for deck and E?R motors

12. Shaft generator.how voltage and frequency is maintined

13. Air gap

14. how freq is matched in shaft generator

15. single phasemotor working

16. what is IP value for alternators , e/r motorsans alt IP22 e/r motors IP44 and deck motors IP56

17. diff betwn intrinsic safe and explosion proof eqpt.

18. how will you achieve stepless speed control in propulsion using motor if alt bearing gets worn out and stator and rotor clearance is irregular what will be d effect?

19. msb safities (deadfront in detail)

20. star delta starter

21. alternator checks

22. open and short ckt test on motors

23. alternator paralleling what to check. draw the phasor diag for two alt in phase.

24. adjustement of freq.what does the effect of adjusting toggle at alt switchboard for adjusting speed at governor. relation bet rpm and frequency.

25. What is resonance in AC circuits

26. Open & Short circuit test in motor with values n procedure

27. what is function of 3 ph induction motor?

28. what is r.m.s. value ?

29. peak factor?

30. average value?

31. brushless alternator?

32. what is thyristor?where it is used

33. what is the use of synchroscope

34. what is the stator and rotor in dc and ac alternators called.

34. NAVIGATION LIGHT GETTING FUSED AGAIN AND AGAIN , REASON , FAULT FINDING ?

35. SYNCHRONOUS MOTOR PRINCIPAL?

36. WINDLASS MOTOR O'HAUL IN DETAIL ?

37. ALTERNATOR NOT PRODUCING VOLTAGE , REASON , ACTION ?

38. SEAWATER SPLASHED ON ENGINE ROOM MOTOR , ACTION , CHECKS ?

39. HOW TO ORDER FUSE ?

40. MSB flow of I in normal operation and then in Black out condition, WHat is Tie?

41. How much voltage dip allowed?

42. Black out test? 43. UV trip, which breaker trip and where located?

44. Decribe any control system u know?

45. S/G electrial control ckt diagram?

46. PID controller?

47 I draw LO pneumatic ckt control syst, asked me to convert into electronic ckt????????????? what a QQQQQ Q was???

48 Ship Power Distribution system?

49. How u will order cable as 2/E? Does any one know Ans.....

50. Earth Neutral Syst?

51. IG- trips in scrubber ? what all other trips?

52. How u will test o2 meter?

53. EXPLAIN ANY CONTROL CIRCUIT ?

54. JACKET WATER CONTROLLER WOKING ? TYPE ?

55. SPEED CONTROL INDUCTION MOTOR ? ENGINE ROOM VARIABLE SPEED MOTOR ?

56 Types of ac motor, used where, differnce in construction of induction and synchronous motor

57. Safeties in Alternator

58. Maintenance of emergency generator

59. electricopen and short ckt test on motors

60. alternator paralleling what to check.what is the use of synchroscope . draw the phasor diag for two alt in phase.

61. what is the stator and rotor in dc and ac alternators called.

62. adjustement of freq.what does the effect of adjusting toggle at alt switchboard for adjusting speed at governor.

63. relation bet rpm and frequency.

64. PID controller block diagram

66. MCB safety

67. Motor short circuit and open circuit test

68. IP in electrical what does it signify and vlues for deck and E?R motors

69. Shaft generator.how voltage and frequency is maintined

70. Air gap

71. Single phase starter

72. OMD alarm sounded.actions

73. msb safities (deadfront in detail)

74. star delta starter

75. alternator checks

76. what is armature reaction. how to take care of it.how is the interpole

different in a generator and motor.

77. what are alternator safeties, main switchboard safeties.

78. how are the generators synchronised, what are conditions required for synchronising.

79. what happens if the load on the generator increases.

80. What is resonance in AC circuits

81. Open & Short circuit test in motor with values n procedure

82. what is function of 3 ph induction motor?

83. what is r.m.s. value ?

84. peak factor?average value?

85. brushless alternator?

86. what is thyristor?where it is used?

87. As 2/e what checks to be done on shore connection box before dry dock? Ans: The shore terminal box should have earthing connection to connect ships earthing to the shore earthing. The phase sequence indicator is fitted to indicate correct supply phase sequence of the connection. It should have ckt breaker and fuses to protect the cable linking the connection box to the main switch board. 88. As 2/e what precaution u will take if shore supply is at 50 hZ and ship system is 60 Hz? Ans: The shore supply has to at 380V, as low freq high voltage supply will burn out the motor. Low freq and low Voltage is less damaging as it will alos heat the motor but slowly.