Interview Questions.

Question 1. What Is I.C Engine?

Answer :

The inner combustion engine converts chemical electricity into beneficial mechanical energy by means of burning gas.

Chemical energy is released when the gasoline-air combination is ignited with the aid of the spark within the combustion chamber. The gas produced on this reaction swiftly expands forcing the piston down the cylinder on the electricity stroke.

Question 2. What Is 2-stroke Engine?

Answer :

A Two-stroke engine is an inner combustion engine in which the piston’s two strokes are required to finish unmarried thermodynamic cycle.

2-STROKE engine is designed by using DUGLAD CLERK in 1880, the enlargement and exhaust takes location during 2-Stroke of piston.

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Question three. What Is 4-stroke Engine?

Answer :

A 4-stroke engine is an inner combustion engine in which the piston’s four separate strokes are required to complete single thermodynamic cycle.

A 4-stroke engine is an inner combustion engine in which the piston completes four separate strokes— intake, compression, energy, and exhaust— in the course of two separate revolutions of the engine’s crankshaft, and one single thermodynamic cycle.

Question 4. Definition Of Octane Number And Cetane Number?

Answer :

Octane No. - Octane quantity is described as the percentage, by using quantity, of iso-octane inside the mixture of iso-octane and h-heptane. It is the degree of rating of SI engine.

Cetane No. - Cetane wide variety is described as the proportion, via extent, of n-cetane within the combination of n-cetane and alpha methyl naphthalene. It is the degree of rating of CI engine.

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Question five. Name The Main Steps Involve In 4-stroke I.C Engine?

Answer :

The steps concerned here are:

Intake stroke: The combination of Air and Fuel. Are drawn in.
Compression stroke: Fuel vapor and air are compressed and ignition takes region.
Combustion stroke: Fuel combustion takes location and piston is driven downwards.
Exhaust stroke: Exhaust is pushed out.
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Question 6. Among Two-stroke Engine And Four-stroke Engine Which Is Generally Preferred And Why?

Answer :

Two stroke engine is usually desired. Because it has smaller length for the equal output.

Question 7. During Idling Process, A Petrol Engine Requires Lean Or Rich Mixture?

Answer :

Lean aggregate.

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Question 8. What Are The Advantages Of Lubrication In Ic Engine?

Answer :

It reduces the wear and tear of the shifting elements.
It damps down the vibration of the engine.
It cleans the moving components.
It makes the piston fuel tight.
Question nine. Name The Fuel Used By I.C Engines?

Answer :

Petroleum: Petroleum spirit, Petroleum diesel, liquefied petroleum gas(LPG), Compressed herbal gas, Jet fuel ,Residual fuel.

Coat: Methanol, Gasoline, Diesel fuel.

Biofuels and Veg Oils: Peanut oiL and other veg oils, Biobutano, biodiesel, Dimethyl. Ether, biogas, hydrogen.

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Question 10. What Are The Advantages Of Lubrication In I.C Engine?

Answer :

following are the benefits of Lubrication in IC Engine:

it reduces the damage and tear of the shifting parts.
It damps down the vibration of the engine.
It cleans the transferring parts.
It makes the piston fuel tight.
Question eleven. Why Have Eight Cylinders In An Engine? Why Not Have One Big Cylinder Of The Same Displacement Of The Eight Cylinders Instead?

Answer :

There are a couple of reasons why a huge four.Zero-Liter engine has 8 half of-Liter cylinders rather than one big 4-Liter cylinder. The principal purpose is smoothness. A V-8 engine is lots smoother as it has eight flippantly spaced explosions in preference to one large explosion. Another reason is starting torque. When you begin a V-8 engine, you're most effective using two cylinders (1 Liter) through their compression strokes, however with one large cylinder you would must compress four titers instead.

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Question 12. What Causes White Smoke In Two Stroke Locomotive Engines?

Answer :

That is due to engine running too Lean combination (lack of gas). This circumstance wilt cause overheating and failure of the engine.

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Question 13. Why Efficiency Of Gas Turbines Is Lower Compared To Lc. Engines?

Answer :

In gasoline turbines, 70% of the output of gasoline turbine is fed on by way of compressor. I.C. Engines have tons Lower auxiliary intake. Further combustion temperature of l.C. Engines is an awful lot better as compared to gas turbine.

Question 14. What Do You Understand By Timed Cylinder Lubrication?

Answer :

For effective lubrication, lubrication oil, wishes to be injected between two piston earrings whilst piston is at backside of stroke in order that piston rides in oil during upward movement. This way tot of lubrication oil may be saved and used properly.

Question 15. In Some Engines Glycerin Is Used In Place Of Water For Cooling Of Engine. Why?

Answer :

Glycerin has boiling point of 90°C which increases its heat wearing capability. Thus weight of coolant receives decreased and smaller radiator can be used.

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Question sixteen. Why We Do Not Use Same Technology To Start Both Si/cl Engine ?

Answer :

The S.I. Or spark ignition engine uses petrol. As a gasoline and the Ci. Or compression ignition engine uses diesel as a gasoline. Both the fuels has special compression ratio.

In SI engine the compression ratio is eight-12:1.
In CI engine the compression ratio is 16-22:1.
So in case of SI engine, the compression ratio isn't always sufficient for fuel to burn so a spark plug is used, while in ci engine, the compression ratio is so high that due to its internal heat the fuel is combusted so there's no want for a spark plug. So the era used in SI engine isn't like CI engine.

Question 17. Which Has More Efficiency: Diesel Engine Or Petrol Engines?

Answer :

Diesel. Engine has the higher performance out of .

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Question 18. What Is The Position Of Piston Ring?

Answer :

In 180 degree perspective the Top ring, Second ring and Oil ring are fixed. Position the hoop about 1 inch hole underneath the neck.

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Question 19. What Are The Advantages And Disadvantages Of Using Lpg In Car?

Answer :

Advantages

Complete combustion
FueL saving
Homogenous combustion.
Disadvantages

As entire combustion is occurring, greater warmness Liberated, now not suggested for Long adventure, engine will be over heated
Installation is hard
Reduce engine Life efficiency.
Question 20. What Is Scavenging?

Answer :

Scavenging is manner of flushing out burnt gases from engine cylinder by introducing sparkling air inside the cylinder earlier than exhaust stroke ends.

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Question 21. What Is Meant By Supercharging?

Answer :

Supercharging is a technique of increasing an engine’s strength output, through forcing air into the engine below more than atmospheric pressures. Supercharging usually refers to belt pushed compressor (I.E. Roots/screw or centrifugal), a few early uses superchargers had been driven at once off the crank shaft.

Question 22. Why Diesel Engine Don’t Have Spark Plug?

Answer :

The compression ratio is high enough to combust the diesel with out the resource of sparkplugs Answer Most diesel engines can have a glow plug, this gives of enough heat to help get the engine commenced, the warmth generated from the first few revolutions together with the compression from the piston is enough to ensure the engine maintains running. Some current diesel engines no Longer require a glow plug.

Question 23. Which Are The Reference Fuels For Knock Rating Of five.1. Engines?

Answer :

n-heptane and ISO-octane.

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Question 24. Which Pollutant Is Major Greenhouse Gas And What Is Its Effect?

Answer :

CO is fundamental greenhouse gas and it traps the radiation of heat from the solar within earth’s atmosphere.

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Question 25. What Are The Important Operational Performance Parameters In Design Of Fuel Firing Equipment?

Answer :

Fuel. Flexibility, electric Load following capability, reliability, availability, and preservation ease.

Question 26. How The Analyses And Calorific Values Of Fuels Can Be Reported?

Answer :

It may be reported as

As acquired or fired (wet) foundation
Dry or moisture free basis.
Combustible or ash and moisture unfastened basis.
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Question 27. What Is Atft Technology Used In Honda Hunk?

Answer :

ATFT approach Advance Tumble Flow Induction Technology, Tumble flow means swirling. In this technology fuel air combination from the carburetor into the engine cylinder with a swirl movement. The gain being one gets a greater green burning of gasoline therefore greater energy and higher gas. Financial system with lesser emissions.

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