Question:
Which ONE of the following options CORRECTLY matches the efficiencies in Column 1 with the corresponding definitions in Column 2?
Column 1 Column 2 I Gear efficiency P Ratio of delivered power to shaft power II Shaft efficiency Q Ratio of shaft power to brake power III Hull efficiency R Ratio of thrust power to delivered power IV Propeller (behind-hull) efficiency S Ratio of effective power to thrust power
Which ONE of the following options CORRECTLY matches the efficiencies in Column 1 with the corresponding definitions in Column 2?
| Column 1 | Column 2 | ||
|---|---|---|---|
| I | Gear efficiency | P | Ratio of delivered power to shaft power |
| II | Shaft efficiency | Q | Ratio of shaft power to brake power |
| III | Hull efficiency | R | Ratio of thrust power to delivered power |
| IV | Propeller (behind-hull) efficiency | S | Ratio of effective power to thrust power |
Show Hint
Trace the power chain from brake power at the engine down to effective power at the hull, one link at a time.
Updated On: Jul 28, 2026
- I-Q; II-P; III-S; IV-R
- I-P; II-S; III-R; IV-Q
- I-P; II-R; III-Q; IV-S
- I-S; II-R; III-Q; IV-P
Show Solution
Verified By Collegedunia
The Correct Option is A
Solution and Explanation
Power flows from the engine to the propeller through several stages, and each named efficiency covers one stage of that chain.
- Gear efficiency: covers the loss in the reduction gearbox between the engine and the propeller shaft, so it is the ratio of shaft power to brake power, matching Q.
- Shaft efficiency: covers the loss in the line shafting and its bearings between the gearbox and the propeller, so it is the ratio of delivered power, the power reaching the propeller, to shaft power, matching P.
- Hull efficiency: compares the power the ship actually needs to move at speed, the effective power, with the thrust power the propeller has to produce, so it is the ratio of effective power to thrust power, matching S.
- Propeller (behind-hull) efficiency: covers the loss inside the propeller itself, turning delivered power into thrust power, so it is the ratio of thrust power to delivered power, matching R.
So the full match is I-Q, II-P, III-S, IV-R, which is option A.
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