Q20. (a) Describe how the Morse Test is used co estimate the indicated power of a multi- cylinder engine. (4)
(b) Slate ONE reason why the Morse Test may be less accurate than using engine indicators. (2)
(c) A four cylinder two-stroke CI engine is run under test at a steady speed of 450 rev/min and delivers a brake torque of 12 kNm. The following measurements were then made with the engine running at 450 rev/min:
fuel shut off from cylinder No. 1 brake torque = 8.5 kNm
fuel shut off from cylinder No. 2 brake torque = 8.3 kNm
fuel shut off from cylinder No. 3 brake torque = 8.4 kNm
fuel shut off from cylinder No. 4 brake torque = 8.7 kNm
Determine EACH of the following:
(i) the brake power; (2)
(ii) the indicated power; (3)
(iii) the bore and stroke of each cylinder, given that the stroke/bore ratio is 1.2 and the indicated mean effective pressure in cylinder No. 1 is 7.6 bar. (5)
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