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Top 100+ Ic Engine Interview Questions And Answers

Question 1. What Are The Advantages Of Lubrication In Ic Engine?

Answer :

Following are the blessings of lubrication in IC Engine:

it reduces the wear and tear of the transferring parts.
It damps down the vibration of the engine.
It cleans the transferring parts.
It makes the piston fuel tight.
Question 2. 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 eight half-liter cylinders rather than one large four-liter cylinder. The principal cause is smoothness. A V-8 engine is much smoother as it has 8 lightly spaced explosions in place of one huge explosion. Another motive is beginning torque. When you begin a V-8 engine, you are best driving cylinders (1 liter) thru their compression strokes, but with one massive cylinder you'll must compress four liters rather.

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Question 3. What Causes White Smoke In Two Stroke Locomotive Engines?

Answer :

That is due to engine going for walks too lean mixture (lack of gasoline). This condition will lead to overheating and failure of the engine.

Question 4. Why Efficiency Of Gas Turbines Is Lower Compared To I.C. Engines?

Answer :

In gasoline generators, 70% of the output of gasoline turbine is ate up with the aid of compressor. I.C. Engines have a lot lower auxiliary intake. Further combustion temperature of I.C. Engines is much better as compared to gas turbine.

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

Answer :

For powerful lubrication, lubrication oil needs to be injected among piston jewelry when piston is at backside of stroke in order that piston rides in oil all through upward movement. This way lot of lubrication oil can be stored and used properly.

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Question 6. In Some Engines Glycerin Is Used In Place Of Water For Cooling Of Engine. Why?

Answer :

Glycerin has boiling point of ninety°C which increases its heat carrying capability. Thus weight of coolant gets reduced and smaller radiator can be used.

Question 7. Why We Do Not Use Same Technology To Start Both Si /ci Engine?

Answer :

The S.I. Or spark ignition engine makes use of petrol as a gas and the C.I. Or compression ignition engine uses diesel as a fuel. Both the fuels has different compression ratio.

In SI engine the compression ratio is 8-12:1.

In CI engine the compression ratio is 16-22:1.

So in case of SI engine, the compression ratio isn't sufficient for gasoline to burn so a spark plug is used, while in ci engine, the compression ratio is so high that because of its inner warmness the gasoline is combusted so there may be no need for a spark plug. So the era used in SI engine is different from CI engine.

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

Answer :

Diesel engine has the better efficiency out of two.

Question 9. What Is The Position Of Piston Ring?

Answer :

In a hundred and eighty diploma angle the Top ring, Second ring and Oil ring are constant. Position the hoop about 1 inch hole below the neck.

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Question 10. What Is Ic Engine?

Answer :

The internal combustion engine converts chemical power into beneficial mechanical strength by way of burning gas.

Chemical strength is launched while the gasoline-air aggregate is ignited through the spark inside the combustion chamber. The gasoline produced on this response swiftly expands forcing the piston down the cylinder on the electricity stroke.

Question 11. What Is 2-stroke Engine?

Answer :

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

2-STROKE engine is designed by means of DUGLAD CLERK in 1880, the suction, compression, growth and exhaust takes place during 2-stroke of piston.

Thermodynamics Interview Questions
Question 12. What Is four-stroke Engine?

Answer :

A four-stroke engine is an internal combustion engine wherein the piston's four separate strokes are required to finish unmarried thermodynamic cycle.

A four-stroke engine is an internal combustion engine wherein the piston completes 4 separate strokes— consumption, compression, electricity, and exhaust— all through separate revolutions of the engine’s crankshaft, and one single thermodynamic cycle.

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Question 13. Definition Of Octane Number And Cetane Number?

Answer :

Octane No. - Octane quantity is described as the percentage, via quantity, of iso-octane within the mixture of iso-octane and h-heptane. It is the measure of score of SI engine.

Cetane No. - Cetane range is described as the share, by means of extent, of n-cetane within the aggregate of n-cetane and alpha methyl naphthalene. It is the measure of rating of CI engine.

Question 14. Name The Main Steps Involve In 4-stroke Ic Engine?

Answer :

The steps worried here are:

Intake stroke: The combination of Air and Fuel are drawn in.

Compression stroke: Fuel vapor and air are compressed and ignition takes location.

Combustion stroke: Fuel combustion takes location and piston is driven downwards.

Exhaust stroke: Exhaust is pushed out.

Question 15. 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 size for the identical output.

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

Answer :