Question 211Motor Plants - 1st Asst/Chief
70% to passWhich of the following oil mist to air ratios would most likely lead to the most severe crankcase explosion?
A2-3% by volume.
B5-7% by volume.
C9-10% by volume.
D12-15% by volume.
AI Explanation
The correct answer is B) 5-7% by volume. This is the correct answer because the most severe crankcase explosions typically occur when the oil mist to air ratio is within the flammable range, which is around 5-7% by volume. At this ratio, the mixture of oil mist and air is most easily ignited, leading to the most violent and destructive crankcase explosions. The other options are less likely to result in the most severe crankcase explosions. Ratios below 5% or above 7% are either too lean or too rich to be as easily ignited and explosive.
Related Questions
Q148:While examining a used fuel injection nozzle(s), one finds worn and enlarged ori... Q86:Heavy fuel oils generally have an upper average ash content of 0.1% by weight. W... Q231:The reversing cams of some four-stroke cycle diesel engines are brought into po... Q39:On small diesel engines, a noticeable decrease in the time interval between the ... Q46:Before any auxiliary diesel engine hydraulic starting system is opened for servi...
Ready to test your knowledge?
Take a Motor Plants - 1st Asst/Chief Practice ExamOfficial Resources