# Latest Mechanical Interview Questions Answers | Ultimate Guide To Thermal Interview Q & A | Latest Automobile Interview Q & A

## Latest Mechanical Interview Questions Answers

You might have heard of the term ‘Mechanical interview’, where the Latest Mechanical Interview Questions Answers were asked to test the candidate for recruitment. This is where companies ask their candidates questions with real purpose. Usually, they want to see if the candidate has the skills needed for the job. They also want to test whether or not the candidate has prepared well enough. In this article, we’ll tell you how to conduct a successful mechanical interview.

### What happens if gasoline is used in a diesel engine? The diesel engine will work?

No, it will not work, as the compression ratio of the petrol engine is 6 to 10 and that of the diesel engine is 15 to 22. Thus, at such high compression, gasoline gets highly compressed and it may blast.

### Which Mechanism is used in the Automobile gearing system

Differential mechanism

### Why different types of sound are produced in different bikes though they say run on SI engine

Engine specifications are different for different manufacturers, such as bore diameter (CC), and ignition timing. Also, the exhaust passage is more responsible for the sound.

### Why does entropy decrease with the increase in temperature?

ds=dQ/T

Entropy is inversely proportional to the temperature so as temperature increases, entropy decreases.

746.2 Watt

### How to calculate the bearing number given the diameter of the inner and outer

Divide the shaft diameter size by 5, it will give the last two digits of the bearing number, and according to the type of load, we have to choose the type of bearing and that will give the prior no. of the bearing.

### Explain Bicycle rear wheel Sprocket working? | Latest Mechanical Interview Questions Answers

The rear-wheel sprocket works under the principle of ratchet and pawl.

### In a domestic refrigerator, a capillary tube controls the flow of refrigerant from the

1. Expansion valve to the evaporator
2. Evaporator to the thermostat
3. Condenser to the expansion valve
4. Condenser to the evaporator

Expansion valve to the evaporator

Reason:

A capillary tube is the replacement of the thermostatic valve and connects the expansion valve to the evaporator.

### Definition of Octane number & Cetane number

Octane Number: Octane number is defined as the percentage, by volume, of iso-octane in the mixture of iso-octane and h-heptane. It is the measure of the rating of the SI engine.

Cetane Number: Cetane number is defined as the percentage, by volume, of n-cetane in the mixture of n-cetane and alpha-methyl naphthalene. It is the measure of the rating of the CI engine.

### Poisson’s ratio is higher in (rubber/steel/wood) | Latest Mechanical Interview Questions Answers

When a material is compressed in one direction, it usually tends to expand in the other two directions perpendicular to the direction of compression. This phenomenon is called the Poisson effect. Poisson’s ratio is a measure of the Poisson effect.

For rubber = 0.5

For steel = 0.288

For wood < 0.2

Thus, Poisson’s ratio is higher in rubber.

### The fatigue life of a part can be improved by?

Improving the surface finish by polishing and providing residual stress by shot peening.

1. Bakelite
2. Asbestos
3. Alumina
4. Copper

1. Alumina

### When crude oil is heated, which hydrocarbon comes first? | Latest Mechanical Interview Questions Answers

At 20 Celsius, natural gas (gasoline)

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