Q10. The daily fuel consumption of a ship at 17 knots is 42 tonne. Calculate the speed of the ship if the consumption is reduced to 28 tonne per day, and the specific consumption at the reduced speed is 18% more than at 17 knots.
Q10. A. Explain the use of KN curves. B. A ship of 6000 tonnes displacement has drafts 7m. f and 8m. A. MCT 1cm. 100 tonnes-m. TPC 20 tonnes, centre of flotation is amidships. 500 tonne of cargo is discharged from each of the following four holds.
No.1 hold, center of gravity 40m forward of amidships
No.2 hold, center of gravity 25m forward of amidships
No.3 hold, center of gravity 20m forward of amidships
No.4 hold, center of gravity 50m forward of amidships
The following bunkers are also loaded: 150 tonnes at 12m forward of amidships 50 tonnes at 15m aft of amidships Find the new drafts forward and aft.
Q4. (a) List the components of residuary resistance. (b) A ship model 6m long has a total resistance of 40N when towed at 3.6 knots in fresh water. the ship itself is 180m long and displaces 20400 tonne. the wetted surface area may be calculated from the formula S= 2.57, Calculate ePn for the ship at its corresponding speed in sea water. f (model)fw =0.492; f (ship)sw =0.421; n=1.825.
Q6. (a) Describe the movement of a ship with negative metacentric height. (b) A ship of 8000 tonne displacement has its centre of gravity 4.5m above the keel and transverse metacenter 5m above the keel when a rectangular tank 7.5m long and 15m wide contains seawater. A mass of 10 tonne is moved 12m across the deck. Calculate the angle of heel:(10) (i) If there is no free surface of water. (ii) if the water does not completely fill the tank.
Q9. A. Describe briefly the inclining experiment and explain how the results are used. B. A ship of 8500 tonne displacement has a double bottom tank 11m wide extending for the full breadth of the ship, having a free surface of seawater. If the apparent loss in metacentric height due to slack water is 14cm, find the length of the tank.
Q6. a) Derive the expression for current and voltage relations between line and phase values in the star and delta cases. Draw vector diagram.
b) Three impedances Z=5+j4 are connected in the form of a delta to the three loads of a balanced 3-phase circuit. The line voltage is 120 Volts.
Find (a) The phase current, (b) Power factor, (c) The volt-ampere in the circuit.
10.A box-shaped barge of uniform construction is 80 m long, 12 m beam and has a light displacement of 888 tonne. The barge is loaded to a draught of 7 m in sea water of density 1025 kg/ m? with cargo evenly distributed. over two end compartment of equal length. The empty midship compartment extending to the full width and depth of the barge is bilged and the draught increases to 10m.
Determine:
(a) the length of the midship compartment.
(b) the longitudinal still water bending moment at midships:
(i) in the loaded intact condition
(ii) in the new bilged condition
Q10. A. Describe the relationship between frictional resistance and: (i)Ship speed; (ii) the wetted area; (iii) surface roughness; (iv) The length of the vessel. B.A ship travels at 15 knots and has a QPC of 0.865 with a delivered power of 2600 KW. The apparent slip is 5% and the real ship is 28%Calculate the total resistance and the wake friction.
Q6.a) Explain the applications of PN junction diode. (6)
b) A full-wave, 1 -phase rectifier employs a double diode valve, the internal resistance of each element of which may be assumed constant at 500 W. The transformer r.m.s. secondary voltage from the centre-tap to each anode is 300 V and the load has a resistance of 2000 W. Evaluate:- (10)
(i) mean load current.
(ii) r.m.s. value of load current
(iii) the d.c. output power
(iv) the input power to the anode circuit
(v) the rectification efficiency
Q10. (A) Compare the effectiveness of a current limiting circuit breaker with that of a HRC fuse. (6)
(B) Evaluate for a frequency of 15 kHz, the amplification and the phase difference between input and output signals of a voltage amplifier using a triode having an amplification factor of 48 and a mutual conductance of 1.2 mA/V with an anode-load resistant of 160 k𝛀. The output p.d. is fed by a coupling capacitor of negligible reactance to a subsequent circuit of resistance 480 k𝛀 and the total shunt capacitance is 90 µF. (10)
Q8. a) What is Prismatic Co-efficient (CP). Derive the formula CP =
, where
= Co-efficient of fineness and
= midship section area co-efficient. (6) b) A watertight door is 1.2m high and 0.75m wide, with a 0.6m sill. The bulkhead is flooded with seawater to a depth of 3m on one side and 1.5m on the other side. Draw the load diagram and from it determine the resultant load and position of the centre of pressure on the door. (10)
Q7. (a) What are the various resistances acting against the motion of the ship? (6)
(b) A vessel of 10000 t displacement burns 25 t of fuel per day when her speed is 12 Knots. Calculate the probable consumption of fuel over a voyage of 3000 nautical miles at a speed of 11 knots with a displacement of 11000 t. (10)
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