INDIAN MARITIME UNIVERSITY

TERM END EXAMINATION - JUNE / JULY, 2014

Sub. Code : T2102 Time : 0300 hrs.Sub. Name : Marine Electro Technology Max Marks : 100Semester : I Pass Marks : 50

Note : 1. Section “A” Compulsory carry 20 marks. 2. Section “B” answer any FIVE questions out of eight questions. All question carry equal marks (16 X 5 = 80 marks.)

SECTION “A” (Compulsory)

01. (a) How do you check the conditions of ships emergency battery explain.

04

(b) List various services where power is failed from emergency power source on board a vessel.

04

(c) How excitation of a brushless alternator is carried out ? Explain with the help of simple diagram.

04

(d) Describe the principal of operation of Bio-metal strips as overload protection device of an induction motor.

04

(e) What is semiconductor materials, explains with electronic configurations.

04

SECTION “B”

02. (a) Explain the electronic configuration of : (i) Carbon (ii) Silicone (iii) Germanium

04

(b) What do you mean by thermistors, discuss its various application on board a ship

04

(c) What is P-N Junction Diode ? 04(d) What is synchro-scope ? 04

03. (a) Draw the power and control circuit diagram of a direct on line starter (DOL) showing the local and remote “Start” & “Stop” push button. Explain the functioning of control circuit.

12

(b) What is the function of “hold on” contract ? 04

04. (a) Draw a line diagram for navigational light panel. Showing different component e.g. main and emergency supply, relay, hooter, indicating light (panel) and navigations lamps.

12

(b) In case of failure of any navigation light, how it is brought to the attention of ship board personally.

04

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05. (a) Explain with the help of a neat circuit diagram the functioning of charging and discharging process of emergency batteries on board ship.

12

(b) Why ship board LV system are provided with insulated neutral ? Explain

04

06. (a) State the conditions which must be satisfied before an AC generator can be parallel with line bus bar of Main Switch Board.

04

(b) State the three lamp method of synchronizing 04(c) Draw and explain synchro-scope. 04(d) Is a synchro-scope is continuous duty equipment or short time

duty equipment04

07. (a) What is the purpose of a main switch board on ship. 04(b) What are the various safety features provided with main switch

board.04

(c) Draw a single line diagram of a typical marine electrical power management systems.

08

08. (a) Show how the power that is transferred across the air gap of the three phase induction motor is represented. Explain the term what proportion of this is useful power

06

(b) A three phase transformer has 420 turns on the primary and 36 turns on the secondary winding. The supply voltage is 3300V. Find the secondary line voltage on no load when the winding are connected (a) Star / Delta (b) Delta / Star.

10

09. Diesel electric propulsion is now being chosen as the power plant by wide variety of vessels. Sketch a simple layout of such an installation. Explain the advantages of selecting such a plant.

16

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