Answer to Question #154903 in Engineering for Nigel

Question

a.       In a test, a certain single-cylinder 4-stroke engine develops a mean effective pressure of 5 bar at a speed of 3000 rev/min. The length of the engine stroke is 0.12 m and the cross-sectional area of the cylinder bore is 0.008 m²  Calculate the indicated power of the engine in kW.                                                                                                                          (5)

b.      A 4-cylinder, 4-stroke engine develops an indicated mean effective pressure of 8 bar at 2800 rev/min. The cross-sectional area of the cylinder bore is 0.01 m² and the length of the stroke is 150 mm. Calculate the indicated power of the engine in kW.                                                                                                                                                                                    (5)

 

QUESTION 5

a.       A certain engine develops a brake power of 120 kW at a speed of 3000 rev/min. At this speed, the indicated power is 140 kW. Calculate the mechanical efficiency of the engine at this speed.                                                  (5)

b.      The data in Table 14.8 shows the results of a Morse test conducted on a 4-cylinder engine. Calculate the indicated power and the mechanical efficiency of the engine.  Table 14.8 Results of a Morse test conducted on a 4-cylinder engine

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Cylinder                                 None                     No. 1                     No. 2                       No. 3                  No. 4

cut-out

bp (kW)                                    25                              17                         16                             18                         16

 

Answer 1

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