The scavenging efficiency of a four stroke cycle diesel engine is

A Below 50%
B Between 50 and 85%
C Between 85 and 95%
D Between 95 and 100%

Correct Answer: Between 95 and 100%

A supercharger is an air compressor that increases the pressure or density of air supplied to an internal combustion engine. This gives each intake cycle of the engine more oxygen, letting it burn more fuel and do more work, thus increasing power.The scavenging efficiency of a four stroke cycle diesel engine is Between 95 and 100%
Bissoy MCQ
#Mechanical Engineering #Internal Combustion Engines (I.C. Engines)

Related Questions

Thermal efficiency of a two stroke cycle engine is _________ a four stroke cycle engine.
A Equal to
B Less than
C Greater than
D None of these
A two stroke cycle engine gives ________ the number of power strokes as compared to the four stroke cycle engine, at the same engine speed.
A Half
B Same
C Double
D Four times
Theoretically, a four stroke cycle engine should develop _________ power as that of a two stroke cycle engine.
A Half
B Same
C Double
D Four times
In a four stroke cycle petrol engine, the pressure inside the engine cylinder during the suction stroke is __________ the atmospheric pressure.
A equal to
B below
C above
D middle
Otto cycle efficiency is higher than Diesel cycle efficiency for the same compression ratio and heat input because in Otto cycle
A Heat rejection is lower
B Expansion and compression are isentropic
C Combustion is at constant volume
D Maximum temperature is higher
Scavenging air in diesel engine means
A Air used for combustion sent under pressure
B Forced air for cooling cylinder
C Burnt air containing products of combustion
D Air used for forcing burnt gases out of engine's cylinder during the exhaust period
In a four stroke cycle diesel engine, the compression
A Starts at 40° after bottom dead center and ends at 10° before top dead center
B Starts at 40° before top dead center and ends at 40° after top dead center
C Starts at top dead center and ends at 40° before bottom dead center
D May start and end anywhere
In a four stroke cycle diesel engine, the inlet valve
A Opens at 20° before top dead center and closes at 40° after bottom dead center
B Opens at 20° after top dead center and closes at 20° before bottom dead center
C Opens at top dead center and closes at bottom dead center
D May open and close anywhere
The expansion of fuel in a four stroke cycle diesel engine
A Starts at 15° before top dead center and ends at 30° after top dead center
B Starts at top dead center and ends at 30° after top dead center
C Starts at 15° after top dead center and ends at 30° before bottom dead center
D May start and end anywhere
The fuel valve in a four stroke cycle diesel engine
A Opens at 15° after top dead center and closes at 20° before bottom dead center
B Opens at 15° before top dead center and closes at 20° after top dead center
C Opens at top dead center and closes at bottom dead center
D May open and close anywhere

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