increase

decrease

be independent

may increase or decrease depending on other factors

2-stroke engine can run in any direction

In 4-stroke engine, a power stroke is obtained in 4-strokes

thermal efficiency of 4-stroke engine is more due to positive scavenging

petrol engines occupy more space than diesel engines for same power output.

homogeneous

heterogeneous

both (a) and (b)

laminar

5-10 kg/cm2

20-25 kg/cm2

60-80 kg/cm2

90-130 kg/cm2

0.15 kg

0.2 kg

0.25 kg

0.3 kg