Question:-
In a Morse test a 2-cylinder, 2-stroke, spark ignition engine, the brake power was 9 kW whereas the brake powers of individual cylinders with spark cut of ware 4.25 kW and 3.75 kW respectively. The mechanical efficiency of the engine is
Option (A)
90%
Option (B)
80%
Option(C)
45.5%
Option(D)
52.5%
Correct Option:
(A)
Question Solution:
(IP)n = (BP)n + FP
(IP)n-1 = (BP)n-1 + FP
(IP)1st = (BP)n cylinder - (BP)n-1
= 9 - 4.25 = 4.75 kW
(IP)2nd = 9 – 3.75 = 5.25 kW
Total IP = 4.75 + 5.25 = 10 kW
\ hm = (BP/IP) = (9/10) x 100 = 90%
question-answer-faq-9149