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Engine > Gasoline Engine > Flashcards

Gasoline Engine Flashcards

1
Q

I stationary position the engine speed is

A

800 rpm

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2
Q

Variable valve timing

A

Adjusting the cam shaft in a way that the valve inlet-outlet time can be changed

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3
Q

Lambda sensor

A
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4
Q

Emissions coming out of the exaust

A

CO, hydrocarbon, Knox,particulate matter

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5
Q

Why 3 oxygen sensor in exhaust

A

To monitor the changes in emissions before and after the catalytic convertor

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6
Q

why Secondary air system is used in gasoline engine

A

To increase the temp of the the catalyst in catalytic convertor

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7
Q

what is a Catalytic convertor

A

catalytic converteris anexhaust emission controldevice that converts toxic gases andpollutantsinexhaust gasfrom aninternal combustion engineinto less-toxic pollutants

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8
Q

GDI engine

A

Fuel is mixed inside the cylinder, due to this fuel and air do not mix properly due to which combustion is not proper and hence emission is not upto the mark I.e localised lambda is not 1.

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9
Q

GPF

A

Gasoline particulate filter component for filtering out emissions in GPF.

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10
Q

In GDI high pressure pumps are required, tru or false and why

A

True, coz Due to fuel going against the pressure inside the cylinder and hence it has to be relized with high pressure.

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11
Q

What is lean mixture?

A

Fuel content is less, air is more

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12
Q

What is rich mixture

A

Fuel content is more, air is less

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13
Q

SOHC

A

Single overhead camshaft

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14
Q

DOHC

A

Dual overhead camshaft

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15
Q

TDC in engine

A

Top dead centre

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16
Q

BDC in engine

A

Bottom dead centre

17
Q

Air gas mixture used in

A

Petrol engine

18
Q

What is engine knocking?

A

knock occurs when the peak of the combustion process no longer occurs at the optimum moment for the four-stroke cycle

19
Q

Statiometric air-fuel ratio

A

14.7:1

20
Q

Energy per litre of diesel

A

36.9 MJ

21
Q

Energy per litre of petrol

A

33.7 MJ

22
Q

Which engine does not use spark plug and why?

A

Diesel coz it has higher compression ratio and hence can be ignited using spark plug.

23
Q

Who has more energy down to a molecule, petrol or diesel?

A

Diesel

24
Q

What is Self ignition tempreture

A

temp at which the air-fuel mixture will ignite without the help of spark plug purely due to compression

25
Q

compression ratios

A

ratio of Max to min volume of the cylinder.

26
Q

Low idle RPM for 4 wheeler engine.

A

800 rpm

27
Q

Low idle RPM for 2 wheeler engine.

A

1200 rpm

28
Q

What is low idel rpm ?

A

It is the least minimum rpm required for sustaining the engine on its own without power.

Engine (5 decks)

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