The ratio of the brake horsepower to the...

Question 1 / 270705eccefa1bacbc34ba4d47363

Question 1 of 270705eccefa1bacbc34ba4d47363

The ratio of the brake horsepower to the indicated horsepower of a diesel engine is its __________.

Question 1 of 27070

The ratio of the brake horsepower to the indicated horsepower of a diesel engine is its __________.

🔍 Key Concepts

• indicated horsepower (ihp) vs brake horsepower (bhp) — where and how each is measured • what mechanical losses (friction, pumps, auxiliaries) do inside an engine • difference between thermal efficiency and other efficiency terms used with diesel engines

💭 Think About

• Ask yourself: which efficiency term compares the power developed inside the cylinders to the power actually available at the crankshaft? • Think about where indicated horsepower is measured (inside the cylinder from pressure) and where brake horsepower is measured (at the output shaft). What is lost between those two points? • Which of the listed efficiencies is specifically about engine friction and moving parts, not fuel heat input or air intake volume?

✅ Before You Answer

• Be clear on the definition of indicated horsepower (ihp) — power calculated from cylinder pressure diagrams. • Be clear on the definition of brake horsepower (bhp) — power measured at the output shaft on a dynamometer or propeller load. • Match the ratio "bhp / ihp" to the term that describes how well the engine’s moving parts transmit power, not how well it turns fuel heat into work.

Question 1 of 27070

The ratio of the brake horsepower to the indicated horsepower of a diesel engine is its __________.

thermal efficiency

mechanical efficiency

brake thermal efficiency

volumetric efficiency

Question 1 / 270705eccefa1bacbc34ba4d47363

Question 1 of 270705eccefa1bacbc34ba4d47363

The ratio of the brake horsepower to the indicated horsepower of a diesel engine is its __________.

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Question 1 of 27070

The ratio of the brake horsepower to the indicated horsepower of a diesel engine is its __________.