Duel Cycle
1 / 10
If the cut-off ratio r_c increases in a dual cycle, the efficiency:
Higher rc = V4 / V3 increases constant pressure heat addition, reducing efficiency. It doesn’t make it equal to Otto’s efficiency.
2 / 10
The constant pressure heat addition in a dual cycle occurs between:
 Constant pressure heat addition occurs from point 3 to 4 after constant volume heating. Other points involve compression or expansion.
3 / 10
The efficiency of a dual cycle compared to Otto and Diesel cycles is:
 For the same compression ratio, dual cycle efficiency is between Otto (higher) and Diesel (lower) due to hybrid heat addition.
4 / 10
On a T-S diagram, the dual cycle’s heat addition appears as:
Constant volume heat addition (2-3) is vertical, and constant pressure (3-4) is horizontal on the T-S diagram. Other shapes don’t apply.
5 / 10
Which dual cycle process has no work done?
 No work is done during constant volume heat addition (2-3) as volume doesn’t change. Other processes involve volume or pressure changes.
6 / 10
Increasing the pressure ratio rp in a dual cycle:
 Higher rp = P3 / P2 increases constant volume heat addition, boosting efficiency. It doesn’t reduce efficiency or mimic Diesel exactly.
7 / 10
In a dual cycle, heat rejection occurs at:
 Heat rejection (5-1) in a dual cycle is at constant volume, like the Otto cycle. Constant pressure rejection occurs in the Diesel cycle.
8 / 10
The compression ratio r in a dual cycle is defined as:
Compression ratio r = V1 / V2 is the volume ratio before and after compression. V4 / V3 is the cut-off ratio, and others are incorrect.
9 / 10
Which process in a dual cycle is identical to the Otto cycle?
 Constant volume heat addition (2-3) matches the Otto cycle. Constant pressure heat addition is specific to Diesel or dual cycles.
10 / 10
The dual cycle is primarily used to model:
 The dual cycle models high-speed diesel engines with combined constant volume and pressure heat addition. Gasoline engines use the Otto cycle, and others are unrelated.
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