Question

The specific fuel consumption per BHP hour for diesel engine is approximately
A. $0.15\,kg$
B. $0.2\,kg$
C. $0.25\,kg$
D. $0.30\,kg$

Answer 1

Hint:First let us see what specific fuel consumption means: For each unit of power generation, real fuel consumption is the volume of fuel consumed by an engine. The basic fuel intake of a car is more or less independent of its per-kilometre nitrogen oxide emissions. The amount of fuel consumed to generate a unit of thrust is the real fuel consumption of an engine.

Complete answer:
Thrust-specific fuel consumption (TSFC) is an engine design's fuel efficiency with regard to thrust performance. TSFC can also be interpreted per unit of thrust as fuel consumption (grams per second) (kilonewtons). Thus it is thrust-specific, which means that the fuel intake is broken by the thrust.

TSFC is the mass of fuel burned in one hour by an engine separated by the thrust generated by the engine. Mass per time divided by force are the units of this performance factor (in English units, pounds mass per hour per pound; in metric units, kilograms per hour per Newton).

Through using extremely heated hot air to ignite the petrol rather than using a spark plug (compression ignition rather than spark ignition), the diesel internal combustion engine differs from the gasoline-powered Otto cycle. Compressed air pressure vaporises fuel from the surface of the droplets.

By burning fuel pumped or sprayed into the compressed, hot air charge inside the cylinder, the diesel engine obtains its energy. It is necessary to heat the air to a degree higher than the temperature at which it will combust the injected fuel. The specific fuel consumption per BHP hour for diesel engines is approximately $0.2\,kg$ .

Hence, option B is correct.

Note:We should not get confused between the fuel consumption between petrol engine and diesel engine. The specific intake of fuel per B.P. For a diesel engine, the hour is roughly $0.2\,kg$, while the real fuel consumption per B.P. An hour is about $0.25\,kg$ for a petrol engine.