Q4. Show by reference to either power, 'out of phase', or light spring diagrams how the following conditions affect engine performance: (a) Turbocharger fouled on gas side, (b) Heavily fouled air filters, (c) Badly worn piston rings and cylinder liners. Give reasons for the deformation to which the normal diagram is subject in each case.
Q5. (a) What is the definition of the following terms: (6) (i) Indicated Power (ii) Specific fuel oil consumption (iii) Brake power (iv) Mechanical efficiency (v) Thermal efficiency
(b) What is an Indicator diagram of diesel engine? Draw a diagram and show different points related to Diesel Engine power measurement. (6)
Q3. i) How power is calculated from indicator diagram. (6)
ii) How does Indicator diagram show early fuel injection? What are bad effects of too early injection? (5)
iii) What are indications of late injection on indicator diagram of the unit? What are bad effects of late injection of fuel on the units? (5)
Q1. Explain the method of obtaining the following diagrams on a 2-Stroke Main propulsion Engine.
a) Power Card, showing vital point of diagram. (4)
b) Out of phase diagram indicating vital points. (4)
c) Light spring diagram, indicating vital points. (4)
d) Compression diagram and its importance. (4)
Q2. a) What is Indicator diagram of a 2-Stroke engine. (4)
b) Draw an indicator diagram, mark each step of the cycle in the diagram. (6)
c) What is mean Effective Pressure and how its value is obtained from indicator diagram. (6)
Q2. (a) In a 4-Stroke engine, describe each of the four strokes of the engine. (6)
(b) Draw timing diagram of a complete cycle.
(c) How each stroke is completed, in the engine with action of crank travel and valves. (10)
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