BT-MRE *VI-05.17-0698 Reg.No.

I. (a)

(b)

(a)

(b)

(a)

Maximum Marks : 100

(5 x 20:100)

rnachineries on board ( I 0)

and explain how the {10}

to the ship

shore supply

of power on

(8)

(4)

(8)

ilL

fv.

v.

B,Teeh. Degree VI Semester Examination inMarine Engineering May 2017

MRE L6fi2 MARINE ELECTRICAL TECHNOLOGY(2013 Scheme)

Time : 3 Hours

Explain the rules and regulations governing electricalthe ships.

Describe a brushless alternator system with a diagfamvoltage is regulated through AVR.

ORNII. (a) (i) Describe the procedure for giving shore power supply

stating necessary precautions to be taken.(iil Explain the dangers associated with connecting a 60112

to 50 Hz ship system.

(b) Explain the regulations and requirements of emergency source

board the ship.

Explain the safeties to be observed with respect to main switch board (10)

including any interlocking arrangements provided.Sketch an ACB and explain how the arc is controlled. (10)

ORDifferentiate between insulated and earthed neutral system bringing out their (10)

advantages and disadvantages.

(b) ti) What is the purpose of neutal earthing resistor in H.V. system?(ii) Calculate the maximum value of E/F current for 6.6 KV 3l system

with a200 ANER.(ii| How is an H.V equipment tested?

(a) With reference to power operated watertight doors that employelectromechanical means for their operation.(i) Show with the aid of a sketch how the doors are operated normally

from the local position.(ii) State how the doors may be opened when electrical failure occurs.

(iiD State, with reasons the type of motors that may be used for such a

dutY.

(b) (D Explain the working of a salinometer with a diagram.(iD What compensation is provided to temperature changes of water?

ORy1. (a) (ij State the regulations for providing navigation lights on board.

(iD Sketch and explain a typieal navigation light indicator panel inwheel house.

(b) With reference to a three speed alternating current cage motor withstators and three contactors, suitable for a cargo winch'(i) Sketch a line diagram of elecrical circuit and explain:

(ii) Calculate the winch speed that will be obtained with a frequency of60Hzand the following number of pole windings.(l) 24 (2) 8 (3) 4

(3)(3)

{4)

(6)

(2)(2)

(8)(2)

(s)(s)the

two

(6)

(4)

{P,T.0.)

2

VII. (a) Describe how you will locate an earth fault in any part of distribution system. (10)(b) Explain how you will present safety trips in the MSB before a surveyor (10)

during dry dock survey in respect of the following, with necessary settingsprovided.

(i) Over current (ii) under voltage (iii) reverse power.OR

Vm. (a) Describe how you will measure the resistance of a motor winding using (10)multimeter.

(b) Describe a condition monitoring system of maintenance for electrical (10)equipments on board and explain the precautions to be taken to prevent fireand shock hazard.

IX. (a) Explain the rules and regulations of elecfric steering gear. Name the safeties (10)incorporated for steering gear motor.

(b) Draw and explain any one type of electric propulsion system bringing out its (10)advantages. N

ORX. (a) (D Explain the role of zener diode safety barrier in intrinsically safe (6)

circuit with a sketch.

(iD Explain how a flame proof enclosure is used to provide elecfiical (4)safeties in hazardous areas.

(b) Explain how maintenance and testings of hazardous equipmentslarea are (10)carried out.

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