Question

what is the quantity of cylinders incorporated within an opposed engine arrangement incorporating four pistons?
3
2
1
4
2 multiple choice 1 point
peak torque output is usually obtained ______ rpm above idle.
400 - 500
200 - 300
300 - 400
500 - 600
3 multiple choice 1 point
todays modern diesel engines have a thermal efficiency of ______
10 - 20%
45 - 52%
55 - 61%
32 - 40%

Explanation:

1. In an opposed - engine arrangement, each cylinder usually has two pistons (one on each end). With four pistons, the number of cylinders is 2.
2. Peak torque output is typically obtained 200 - 300 rpm above idle in many engines.
3. Modern diesel engines have a relatively high thermal efficiency, usually in the range of 45 - 52%.

Answer:

1. B. 2
2. B. 200 - 300
3. B. 45 - 52%