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

Correct Answer: Air used for forcing burnt gases out of engine's cylinder during the exhaust period

In automotive usage, scavenging is the process of pushing exhausted gas-charge out of the cylinder and drawing in a fresh draught of air or fuel/air mixture for the next cycle. This process is essential in having a smooth-running internal combustion engine.
Bissoy MCQ
#Mechanical Engineering #Internal Combustion Engines (I.C. Engines)

Related Questions

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%
If 'blue' means 'green', green' means 'yellow' 'yellow' means 'orange', 'orange' means 'black', 'black' means 'white', 'white' means 'red', 'red' means 'pink', 'pink' means 'brown', 'brown' means 'grey', than what is the color of human blood?
A black
B red
C white
D orange
In diesel engine the diesel fuel injected into cylinder would burn instantly at about compressed air temperature of
A 250°C
B 500°C
C 1000°C
D 2000°C
Does the supply of scavenging air at a density greater than that of atmosphere mean engine is supercharged?
A Yes
B No
C To some extent
D Unpredictable
Equal volumes of aniline and diesel oil when mixed at room temperature (during summer) was found to be completely mis-cible. It means that the aniline point of the diesel is __________ the room temperature.
A More than
B Less than
C Same as
D Either more or less; depends on the room temperature
In the crankcase method of scavenging, the air pressure is produced by
A Supercharger
B Centrifugal pump
C Natural aspirator
D Movement of engine piston
The output of a diesel engine can be increased without increasing the engine revolution or size in following way
A Feeding more fuel
B Heating incoming air
C Scavenging
D Supercharging
The specific fuel consumption of a petrol engine compared to diesel engine of same H.P. is
A Same
B More
C Less
D Less or more depending on operating conditions
The compression ratio in petrol engine is kept less than in Diesel engine because
A It makes petrol engines lighter
B Higher or equivalent compression ratio in petrol engines is not possible due to pre-ignition
C Less compression ratio gives better performance
D It is just customary to have less compression ratio in petrol engines
In a petrol engine, if diesel is used, then the engine will
A Not run
B Run more efficiently
C Run at high speed
D Explode

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