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Q10. A. Write shorts notes on various types of DC Motors.

B. A 440V shunt motor takes an armature current of 30A at 700 rev/min. The armature resistance is 0.7ohm. If the flux is suddenly reduced by 20 per cent, to what value will the armature current rise momentarily? Assuming unchanged resisting torque to motion, what will be the new steady values of speed and armature current? Sketch graphs showing armature current and speed as functions of time during the transition from initial to final, steady-state conditions.

Q1. As Second Engineer of a new ship,

A. Prepare standing orders for all future bunkering operations onboard;

B. State why it is very important to obtain a representative sample of heavy fuel bunkers taken.

C. State how a representative sample is obtained;

Q2. A. Describe the double bottom and framing arrangement used in the machinery space to cope up with the concentrated loads and vibration, together with shaft and thrust block support.

B. Give reasons for the choice of thrust block position.

Q6. A. Explain the principles underlying the STCW Convention;

B. Explain how as a senior engineer you would implement the regulation for controlling and monitoring of minimum hours of rest for watch keepers;

C. What type of specific shipboard familiarization is required to be given to a seafarer new to a particular type of vessel?

Q2. Sketch and describe an arrangement for automatic connection of emergency batteries upon loss of main power. Include in your answer:

A. Means of obtaining D.C. charging supply from a.c. mains;

B. A method of maintaining charge on lead acid batteries;

C. The arrangement to check that a battery operates a loss of main power

D. The length of time for which emergency batteries of passenger and cargo ships must provide power.

Q4. Discuss the advantages and disadvantages of adopting the following policies for maintenance of main and auxiliary diesel engines. A. Planned maintenance; B. Condition monitoring; C. Periodic replacement of components. D. Break down maintenance

Q6. With regard to keeping the gas side of boilers in good condition discusses EACH of the following:

A. the mechanism of combustion, stating the factors which are important to good combustion;

B. Oil fuel treatments;

C. Soot removal equipment;

Q1. A fire in the exhaust gas boiler on a motor ship may develop in two or three stages. With reference to such situations, discuss: A. The factors which could be a cause for initiation and development of: (i) Ignition of soot; (ii) Small soot fires; (iii) High temperature fires. B. State the standing instructions you, as a Second Engineer Officer, would issue with respect to the action to be taken in the event of a boiler uptake fire.

Q3. A. Sketch and describe TWO methods that employ manometric means for measuring tank contents. (6)

B. State what corrections are made to the readings obtained by the methods described in (A) in order to gauge the mass contents? (5)

C. Explain how bunkering requirements may be estimated when no records of main engine fuel consumption are available on board. (5)

Q2. With reference to the carriage and pumping of liquefied gas cargo:

A. Sketch a suitable pumping system labelling the component parts;

B. State;

i) Why submerged hydraulically driven pumps are not used;

ii) How overheating of pump drive shaft bearings is avoided;

C. State, how the risk of fire and explosion in cargo tanks is obviated both in the loaded and discharged condition.