DieselShip's Online Content Library

Q1. In engine rooms that are operated under UMS conditions describe with the aid of sketches how the following are monitored:

(a) The perforation of a high-pressure fuel pipe (7)

(b) The imminence or possibility of a scavenge fire (7)

(c) Engine room bilges (6)

Q1. The main requirements which a fuel injection system must fulfil are (16)

(a) Accurate metering of small amount of fuel oil

(b) Control of quality of fuel injection

(c) Proper timing of the fuel injection

(d) Selective distribution of the fuel in the combustion space

State whether each one of the points made above are true or false with reasons.

Q1. Explain with a simple line sketch, a main engine jacket cooling automatic control system capable of maintaining the jacket water temperature within close limits during wide changes in engine load. (16)

Q1. (a) What is a right-handed and a left-handed propeller? (4)

(b) With the aid of simple sketches explain Rake, Skew and Pitch of the propeller. (6)

(c) What are the advantages and disadvantages of CPP? (6)

Q1. Draw cooling water system of main engine and naming each component and describe flow of cooling water through the system. (16)

Q1.a) What are the different types of coupling bolts used in practice? Name at least 3. (3)

b) Explain with the help of sketch, as to how a ‘pilgrim’ hydraulic bolt is fitted and removed? (8)

c) How are fitted boards installed on the coupling? (5)

Q2. The reciprocating bilge pump on board your ship, has gradually stopped taking suction from the engine room bilge wells. Write a letter to the owner / manager stating the parts of the pump you suspect are either worn out or broken. (16)

Q2. The cylinder liner of one of the unit is cracked inspite of the engine having logged only 300 hours since last overhaul. Make a report of what you feel could be the cause of this mishap (16)

Q2. With reference to the ISPS Code state the following.

(a) Duties of ship's security officer (8)

(b) Shipping company's responsibilities (6)

(c) Certificate issued as per the code and its validity (6)

Q2. a) What is the function of insulation in an electric conductor? (3)

b) What are the various classes of insulation? (8)

c) What are the desired properties of insulating materials? (5)

Q2. (a) Explain the working principle of a fuel oil purifier. (8)

(b) Explain briefly the significance of the friction clutch mechanism. (4)

(c) List the alarms and trips associated with a purifier. (4)

Q2. Define the main purpose of the following with respect to tank and pumping system.
(a) Weighted cocks on tank sounding pipes (4)

(b) Remote operated gear for bilge valves (4)

(c) Ventilation pipes for double bottom tanks (4)

(d) Explain why gauze is sometimes fitted to tank ventilation pipes and explain the effect of mesh size. (4)

Q3. (a) Briefly explain the construction and functions of a bedplate in a slow speed marine diesel engine? (8)

(b) How is the bedplate fastened to the hull structure? (4)

(c) What is the function of the tie-rod in a slow speed 2-stroke engine? (4)

Q3. (a) Sketch and describe a non-portable 136-liter foam fire extinguisher (8)

(b) Briefly explain how to operate the foam extinguisher (3)

(c) State the two constituents used, which enable stable foam to be produced (3)

(d) State for what approximate length of time, the engine should generate foam (3)

(e) Where on board ship would you expect such an extinguisher to be located (3)

Q3. Which of the materials listed is used as the dynamic seal material on mechanical seals installed on most centrifugal pumps used in water service? (16)

(a) Copper.

(b) Copper and carbon.

(c) Carbon.

(d) Bronze.

Briefly justify your answer.

Q3.a) How protection is provided for electrical short circuit. (4)

b) Describe the construction and operation of HRC fuses? (8)

c) What are the advantages of HRC fuses. (4)

Q3. Briefly explain the following ship terms used:

(a) LOA (2)

(b) LBP (2)

(c) Breadth Extreme (2)

(d) Breadth Moulded (2)

(e) Depth Extreme (2)

(f) Depth Moulded (2)

(g) Draught Extreme (2)

(h) Draught Moulded (2)

Q3. Describe following procedures for rudder maintenance in a dry dock.

a) What is Jumping Clearance and why is it considered a valve of importance? (8)

b) What is Rudder Drop and describe the procedure for measuring the rudder drop? (8)

Q4. With reference to an emergency source of electrical power in cargo ships:

(a) Describe a typical power source (10)

(b) Give a typical list of essential services, which must be supplied simultaneously (5)

(c) Explain how the emergency installation can be periodically tested (5)

Q4. (a) Sketch and describe a central cooling freshwater system for a motor ship. (8)

(b) State the possible causes of corrosion in the closed system described in (a). (4)

(c) Explain how protections against corrosion is provided? (4)

Q1. An auxiliary engine under load continuously fluctuates even with a steady load. The fault you diagnose could be owing to: (16)

(a) The quality of fuel

(b) The quality of servicing of the governor in the last port

(c) The supply of charge air

(d) The overhaul of fuel injectors done in the last decarbonization Give a brief explanation as to why each of the above mentioned points either could be true or cannot at all be the reasons for such a fluctuation.

Q9. (a) Shunt generators having drooping characteristics are best suited for parallel operation. Discuss (6)

(b) Two 220 V D.C. generators each having linear external characteristics, operated in parallel. One machine has a terminal voltage of 270 V, on no-load and 220 V at a load current of 35 A, while the other has a voltage of 280 V at no-load and 220 V at 50 A. Calculate the output current of each machine and the bus bar voltage when the total load is 60 A. What is the kW output of each machine under this condition. (10)

Q4. Define centre of buoyancy and show with the aid of sketches how a vessel which is stable will return to the upright after being heeled by an external force. (16)

Q4. Describe the following non-destructive test methods:

a) Dye penetration test principle, and method in details. (8)

b) Magnetic particle testing principle and method in detail. (8)

Q5. (a) Why exhaust outlet of marine diesel engine turbocharger is lower than inlet temperature? (6)

(b) Why do we need an air cooler and why is the scavenge air temperature maintained at 40°C? (10)

Q5. (a) State why the presence of oil in boiler water is considered serious. (4)

(b) Suggest likely sources of oil contamination. (4)

(c) Describe how the source is traced. (4)

(d) Describe how the whole steam plant is restored to oil free conditions. (4)

Q5.a) Briefly explain static induction and dynamic induction. (6)

b) A coil of 250 turns is wound uniformly over a wooden ring of mean circumference 500mm and uniform cross-sectional area of 400mm2. If the current passed through the coil is 4A find (a) the magnetizing force (b) the total flux. (10)

Q5. (a) State why cargo ships must have a collision bulkhead. (6)
(b) A bilge holding tank of 5m length. 3m width and 1.8m depth has water of density 1.020 t/m3 upto a sounding of 1.3m and oil of density 0.86 t/m³ is floating on top of water up to an ullage of 0.3m. Calculate the mass of water and oil in the tank. (10)

Q1. a) Describe the routine testing required for self-contained breathing apparatus sets. (10)

b) Describe the procedure to be adopted to find missing personnel in a smoke-filled accommodation area. (10)

Q5. a) Describe types of arc welding processes. (8)

b) Describe what level of temperatures are reached during arc welding. (4)

c) Describe precautions taken to avoid health and shock hazards during welding. (4)

Q6. (a) Describe, with the aid of a sketch, the braking arrangement for the controlled lowering of lifeboats (10)

(b) State the periodic survey requirements relating to the wire rope fall of lifeboats (10)

Q6. Describe the following metallurgical tests and explain why EACH is carried out:

(a) Impact test (4)

(b) Hardness test (4)

(c) Endurance test (4)

(d) Tensile test (4)

Q8. (a) (i) Describe with the aid of a sketch, a main engine exhaust valve which is hydraulically operated (8)

(ii) Explain the operation of this valve (4)

(b) State the materials used for the seat and valve described in (a) (4)

Q6. a) Explain how excitation of the rotor is produced and supplied. (6)

b) A shunt motor has an armature resistance of 0.2 ohms and with an armature current of 120 amperes runs at 750 r.p.m. off a 400-volts supply. Calculate the speed and armature current of the motor if the flux per pole is reduced to 75 per cent of its initial value, the total torque remaining unaltered. (10)

Q6. (a) Define TPC. Explain why TPC for a given draught will vary with the density of the water in which the ship floats (6)
(b) The pitch angle, measured at a distance of 2m from the centre of the boss, was found to be 21.5  Calculate the pitch of the propeller (10)

Q6. A Centrifugal pump has been opened up due to abnormal noise:

a) List the checks you will carry out on various parts (4)

b) Name the parts which may require replacement. (4)

c) Checks to be carried out after assembly. (4)

d) Operational parameters, which may be required to be compared with manufacturers test records. (4)

Q7. (a) Why do you need an 'over-speed' trip despite a governor being fitted to a marine diesel engine? (8)

(b) With respect to an auxiliary engine governor, what is the significance of: (8)

(i) The Load limit knob

(ii) The compensation

Q7. (a) Sketch a simple line diagram showing a shipboard oily water separator in series with a coalescing second stage (8)

(b) Briefly describe the above arrangement and its operations also state the allowable oil content in p.p.m. of the discharge effluent from such an arrangement (8)

(c) Explain how oil density and temperature relate to separation (4)

Q7. If a radial piston hydraulic pump fails to deliver rated fluid volume, the cause can be (16) (a) Contaminated fluid

(b) Pitted thrust rings

(c) Worn pintle bearings

(d) Obstructed suctions passage

Briefly justify your answer.

Q7. a) State the conditions, which must be satisfied before an A.C generator can be paralleled with live bus-bars. (4)

b) Sketch a lamp-bright configuration for synchronizing lamps. (8)

c) State the advantages and disadvantages of the lamps-bright system over lamps-darks system. (4)

Q7. (a) Explain clearly the meaning of the term ‘reserve buoyancy' (6)
(b) When a mass of 6 t is moved transversely through a certain distance on a ship of 4300 t displacement, the deflection of an 11 m pendulum is found to be 120 mm. The transverse meta-centre is 7.25 m above the keel and KG 5.46 m. Find the distance through which 6 t was moved (10)

Q7.a) Describe how A. E, crankshaft deflections are measured. (6)

b) State how the measurements can be checked for accuracy. (5)

c) Specify with reasons other checks that should be made on the crankshaft. (5)

Q8. (a) List the SOLAS requirements for steering gear system of an ocean going ship. (10)

(b) Describe the drills and exercises mandated by the SOLAS convention with regards to the steering gear system with reference to the convention. (10)

Q8. (a) Explain briefly how the different moving parts of a main engine are subjected to various stresses. (8)

(b) Name the stresses and justify by stating how they originate. (8)

Q8. Write short notes on the following:

(a) Incinerators (5)

(b) Airline relief valve (5)

(c) Mixing column (6)

Q8. With reference to a three-phase shipboard electrical distribution system.

a) Enumerate the advantages of an insulated neutral system (4)

b) Enumerate the disadvantages of an insulated neutral system (4)

c) Compare the use of an insulated neutral system as opposed to use of an earthed neutral system with regards to the risk of electric shock from either system. (8)

Q8. (a) Explain various powers and efficiencies in the Propulsion plant of a ship (6)
(b) A vessel with a displacement of 12250 t burns 290 t of fuel while travelling at a speed of 15 knots on a voyage of 2850 nautical miles. On a voyage of 1800 nautical miles at a speed of 13 knots and a displacement of 14200 t, estimate the quantity of fuel that will be burnt. (10)

Q8. a) Describe the working of a Mechanical Shaft seal with a diagram. How working fluid leak is prevented? (8)

b) What are causes of Mechanical shaft seal failure? (4)

c) Describe for Mechanical shaft seal usage

i) Advantages (2)

ii) Disadvantages (2)

Q9. With reference to Port State Control:

(a) List the certificates which a Port State Control officer may like to see during inspection (10) (b) What do you understand by the following:

(i) Clear Grounds (2)

(ii) Detailed inspection of the ship (2)

(iii) Detainable deficiencies in SOLAS (4)

(iv) Suspension of inspection (2)

Q9. (a) Make a detailed sketch of a direct expansion two room refrigeration system. (10)

(b) Give a full description of such a Refrigeration System, explaining the purpose of the relevant control and safety devices. (6)

Q9. a) Differentiate between resistance, induction and impedance in an a.c. circuit. (6)

b) A circuit is made up from resistors of value 2Ω, 4Ω, 5Ω and 10Ω connected in parallel. If the current is 8.6A, find the voltage drop across the arrangement and the current in each resistor. (10)

Q9. (a) What are the effects of adding mass to draught and trim of a ship?
(b) A ship of 7000 t displacement has a water plane area of 1500 m2. In passing from sea water into river water of 1005 kg/m3 there is an increase in draught of 10 cm. Find the density of the sea water (10)

Q9. With reference to lifeboats and davits describe (a & b) with the aid of sketches:

a) The purpose and types of “limits switches”. (6)

b) The centrifugal brake and state the method of testing. (5)

c) Enumerate routine maintenance of lifeboat engine & life boat winch. (5)

Q1. (a) Describe the procedure for taking crankshaft deflection of Auxiliary Engine, explaining all precautions that must be observed (8)

(b) Explain what deflection readings actually mean and suggest the action which must be taken should readings be outside values recommended by the engine manufacturer. (8)