Question 21Motor Plants - Assistant Engineer70% to pass
In the pressure-volume diagram, shown in the illustration, what is indicated to have occurred by the line connecting points 'd' and 'e'? Illustration MO-0035
AI Explanation
The correct answer is A) The combustion gases have expanded.
The line connecting points 'd' and 'e' on the pressure-volume diagram represents the expansion stroke of the engine cycle. During this stroke, the combustion gases produced from the fuel/air charge ignition expand, pushing the piston down and creating the power to rotate the crankshaft.
The other options are incorrect because: B) The crankshaft has rotated 90° is not directly indicated by the line between 'd' and 'e'; C) Pressure and volume have increased is the opposite of what happens during the expansion stroke; and D) The fuel/air charge is compressed occurs earlier in the engine cycle, not during the expansion stroke.
Related Questions
#19 In the pressure-volume diagram, shown in the illustration, the volume line is divided into 16 units indicating _______________. Illustration MO-0035 #20 In the pressure-volume diagram shown in the illustration, curve 'A-d' indicates_______________. Illustration MO-0035 #22 On the cylinder indicator diagram illustrated, the dotted line indicated as 'L' is describing the _______________. Illustration MO-0033 #23 Which of the indicator diagrams illustrated depicts the condition that should be corrected by retarding only the timing? Illustration MO-0029 #24 On the indicator card shown in the illustration, lines 'A' and 'B' indicate_______________. Illustration MO-0108