Perguntas e respostas da entrevista de engenharia automotiva

Automotive Engineering Interview Questions and Answers

June 24, 2024 Roberto Magalhães

Basic Automobile Engineering Interview Questions and Answers

1. What will be the position of the piston ring?

At an angle of 180 degrees, the top ring, second ring and oil ring are fixed. Position the ring with approximately 1 inch of clearance below the neck.

2. What is the D4D technology used in the Toyota Vigo?

The D-4D is widely recognized as one of the most advanced diesel technologies on the market today. Diesel engines relied on relatively simple technology, with a low-pressure mechanical injector that delivered fuel to a pre-combustion chamber in the cylinder head, where a single ignition occurs – triggered by the intense heat of high compression.

3. What is DTSi technology?

DTSI stands for Digital Twin Spark Plug Ignition. Vehicles with DTSI Technology use 2 spark plugs controlled by a digital circuit. This results in efficient combustion of the air-fuel mixture.
Digital – Since the spark generation will be initiated by a microchip.
Twin – Since two candles will be used.

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5. What is PGM FI technology used in Honda Stunner Bike?

The development of an ECU-integrated throttle body module for electronic fuel injection

system for small motorcycles.

Honda aims to reduce total HC (hydrocarbon) emissions from new vehicles by approximately 1/3 and further improve average fuel economy by approximately 30% (both from 1995) by the year 2005. To achieve the target , from the Asaka R&D Center considered that small motorcycles used in many countries around the world should be further improved to obtain clean exhaust gases and low fuel consumption. Therefore, we began the development of the PGM-FI system for small motorcycles with engines of 125 cc or smaller, including air-cooled engines.

To ensure clean exhaust gases and high fuel economy, combustion control through precise fuel delivery is essential. As the conventional FI system (electronic fuel injection system) applied to motorcycles is bulky and expensive, its application has been mainly in large motorcycles that use multi-cylinder engines.

In the newly developed PGM-FI, for application in small displacement models, obstacles have been eliminated through the full use of Honda techniques to reduce the size of components, as well as taking full advantage of the FI techniques obtained in large motorcycles. The compact PGM-FI offers new benefits, such as reducing environmentally harmful substances released and improving drivability, etc.

6. What is the ATFT technology used in the Honda Hunk?

ATFT stands for Advanced Tumble Flow Induction Technology,

Falling flow means whirlwind. In this technology, the air-fuel mixture from the carburetor to the engine cylinder with a swirling action. The advantage is to get more efficient fuel burning, therefore more power and better fuel economy with fewer emissions.

7. The compression ratio of the gasoline engine is always less than the compression ratio of the diesel engine, why?

Gasoline is not self-igniting, it needs a spark to ignite in the chamber. While diesel is self-igniting in the diesel engine, achieving this state requires high temperature and pressure. This temperature and pressure are higher than those required in gasoline engines due to the properties of this fluid.

8. What are the causes of black smoke from the main engine?

There are many causes of black smoke.

1.It is an improper mixture of fuel supply by the carburetor, such as too rich a mixture, so that the fuel burns incorrectly.

2. This is when the piston or piston ring fails so that the release of cooling oil into the rear of the combustion chamber causes black smoke.

3. Inadequate ignition system, such as insufficient delay time for pressure increase.

4.Detonation

9. Explain the basic difference between BS2 and BS3 engine.

The basic difference between BS2 and BS3 engines is the presence of a catalytic converter. The catalytic converter is present in the BS3 engine which helps in reducing the formation of HC and CO. While in BS2 engine there is no catalytic converter present which forms HC and CO. The full form of BS is the Bharat stage, which is a standard issue in India.

10. What is clutch drag?

When the clutch does not fully disengage and has some difficulty changing gears, this defect is called clutch drag.

11.What are BS3 and BS4 engines?

According to ARAI, the exhaust emissions of BS-III two-wheelers dictate that the petrol engine must have carbon monoxide (CO) restricted to 1.00 g/km and the emission level of hydrocarbons + nitrous oxide (HC + NOx) should also not be more than 1.00 g/km. For a vehicle to be BS-IV compliant, it must have an emission of not more than 0.75 g/km of CO and HC+Nox respectively. This means that engines have to be new to not emit pollutants, helping to reduce overall exhaust gas pollution.

12.What is octane number and cetane number?

The octane number can be defined as the percentage, by volume, of isooctane in the mixture of isooctane and h-heptane. It is the measure of the SI engine rating.

While cetane number can be 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 CI engine rating.