QUESTIONS ON MARINE ELECTRICAL PART....(with answers)-PART I

1. What is the only indication of a fully charged alkaline cell?              Ans :1.6-1.8v
2. How is salt contamination of motor removed?                                Ans : wash fresh water & dry
3. Electrical insulation will break down more quickly due to?                Ans : high temperature & vibration
4. What can excessive application of petroleum jelly cause?               Ans: burning & pitting of constriction 
5. What is used to adjust power factor?                                                 Ans:  The excitation of alternator used to adjust
6. Which of the listed section of an emergency switch bus is used to supply power to alarm signal under emergency situation?              Ans: 24v dc busbar
7. Equal power factor on parallel AC generator are maintain by an automotive?                                                                                Ans : voltage regulator
8. Can you normally the shore supply with the ship alternator?            Ans: its not possible.
9. What is minimum allowable temperature of electronic during the charging of lead acid battery?                                                             Ans:  45⁰c
10. If transformer is connected to dc source the transformer     will overload at the ……………….                                                                              Ans: primary coil
11. What should be used to dress the copper contacts?                       Ans: a fine file or glass paper.
12.  What         is    the    main        function             in the                use of a capacitor is starting a single phase motor?                                                                                  Ans: split the phase to establish a rotating magnetic field.
13. What is usual short circuit time delay for the alternator over current production?                                                                                 Ans: 0.1 to 3 seconds
14. What a star- delta star when is the change over operated?            Ans: at fully rater speed
15. A purpose of suppressor?                                                              Ans: to reduce electrical inter France.
16. The force that causes free electronics to flow in conductor as an electric current flow is called?                                                          Ans: electromotive force.
17. What mist is    guarded      against where clearing     alternator winding with low pressure air?                                                                        Ans: 1.dirt is not pushed. 2. deeper into winding.
18. A circuit with a blown fuse can be described as?                            Ans: open circuit.
19. What is the starting torque? When the motor winding are in star as percentage of fully load torque?                                                     Ans: 80%
20. What is air pressure to be used when blowing out motors?              Ans: 1.75 bar                                                    Keep reading the blog for the futher questions on different parts of marine engineering.....happy reading..(the answers are given may be approx. please refer someother sources also.)