Which of the following is not a typical engine modification for reducing emission
A. Lower compression
B. Leaner air- fuel ratio
C. increased valve overlap
D. wider spark plug gaps

Select any two (2) areas of applications of chain-drive. (clo4) a)-permanent lubrication necessary b)-hydraulic forklift truck operation c)-rigging and heavy moving materials d)-relatively high maintenance costs e)-costlier than belt drives