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Ques:- Why the compression ratio of the diesel should be high?
Right Answer:
The compression ratio of a diesel engine should be high to increase the temperature of the air in the cylinder, which helps ignite the fuel more efficiently and improves overall engine efficiency and power output.
Ques:- What does a retarder actually when applied in an automobile??
Right Answer:
A retarder in an automobile is a device that slows down the vehicle by using resistance or friction, typically without relying on the brakes. It helps in controlling speed, especially during downhill driving, and reduces wear on the braking system.
Ques:- What is mean dual combustion turbocharged?
Right Answer:
Dual combustion turbocharged refers to an engine system that uses two different combustion processes (such as gasoline and diesel) to improve efficiency and power output, combined with a turbocharger to enhance air intake and performance.
Ques:- When a bicycle is in motion, the force of friction exerted by the ground on the two wheels is such that it act as) In the backward direction on the front wheel and in the forward direction on the rear wheel.(b) In the forward direction on the front wheel and in the backward direction on the rear wheel.(c) In the backward direction on both the front and rear wheels.(d) In the backward direction on both the front and rear wheels.
Right Answer:
(d) In the backward direction on both the front and rear wheels.
Ques:- Why different types of sound are produced in different bykes though they say run on SI engine
Right Answer:
Different types of sounds in bikes running on SI (Spark Ignition) engines are produced due to variations in engine design, exhaust systems, tuning, and the materials used in construction. Factors like engine displacement, compression ratio, and the presence of aftermarket modifications also contribute to the unique sound characteristics of each bike.
Ques:- Define material grades 15b25,10b21,scm-415,16mncr5 in detailwith their compositions
Right Answer:
- **15B25**: A low-carbon steel with approximately 0.15% carbon and 0.25% manganese. It is often used for structural applications and has good weldability.

- **10B21**: A low-carbon boron steel with about 0.10% carbon and 0.20% manganese. It is known for its good hardenability and is used in applications requiring high strength.

- **SCM-415**: A chromium-molybdenum alloy steel with approximately 0.40% carbon, 0.80% chromium, and 0.25% molybdenum. It offers good toughness and strength, commonly used in automotive and machinery components.

- **16MnCr5**: A low-alloy steel with about 0.16% carbon, 1.0% manganese, and 0.5% chromium. It is used for case-hardening applications, providing good wear resistance and toughness.
Ques:- Why vertical type mufflers are used in highway trucks?(other them space constrain)
Right Answer:
Vertical type mufflers are used in highway trucks primarily to improve exhaust flow and reduce back pressure, which enhances engine performance and efficiency.
Ques:- What are the procedures of starting of diesel engine?
Right Answer:
1. Ensure the fuel system is primed and there is adequate fuel supply.
2. Check the oil level and other fluid levels.
3. Turn on the ignition switch to activate the electrical systems.
4. Engage the starter motor to crank the engine.
5. Allow the engine to reach a stable idle speed.
6. Monitor for any abnormal sounds or warning lights.
Ques:- How much fuel use for perfect average in motorbike ….
Right Answer:
The perfect average fuel consumption for a motorbike typically ranges from 40 to 60 miles per gallon (mpg), depending on the model and riding conditions.
Ques:- By mixing oil in fule of fourstroke bike will it damage engine, performance? if not than what happen?
Right Answer:
Mixing oil in the fuel of a four-stroke bike can damage the engine and negatively affect performance. Four-stroke engines are designed to use oil separately in the crankcase, and adding oil to the fuel can lead to improper combustion, increased smoke, and potential engine deposits or damage.
Ques:- WHAT IS THE MEANING OF BACK COMPRESSURE IN ENGINE?
Right Answer:
Back pressure in an engine refers to the resistance or pressure that exhaust gases encounter as they exit the engine and pass through the exhaust system. It can affect engine performance and efficiency.
Ques:- What is the principal of hydraulic braking??
Right Answer:
The principle of hydraulic braking is based on Pascal's Law, which states that when pressure is applied to a confined fluid, it is transmitted equally in all directions. In a hydraulic braking system, when the brake pedal is pressed, it creates pressure in the brake fluid, which is then transmitted to the brake calipers or drums, causing the brake pads or shoes to clamp onto the brake discs or drums, slowing down or stopping the vehicle.
Ques:- Overview of working of commen rail injection system in cars?
Right Answer:
A common rail injection system in cars uses a single high-pressure rail to supply fuel to multiple injectors. The fuel is pressurized by a pump and stored in the rail. Each injector can then spray fuel into the combustion chamber at precise timings and quantities, controlled by the engine's electronic control unit (ECU). This allows for better fuel atomization, improved combustion efficiency, reduced emissions, and enhanced performance.
Ques:- Why we did't use petrol engine for haevy purpose…?
Right Answer:
Petrol engines are generally less efficient and produce less torque compared to diesel engines, making them less suitable for heavy-duty applications that require high power and durability.
Ques:- How to design the blower for motor? how to two blowers connected in motor?
Right Answer:
To design a blower for a motor, consider the following steps:

1. **Determine Requirements**: Identify the airflow rate (CFM) and pressure (static pressure) needed for the application.
2. **Select Blower Type**: Choose between centrifugal or positive displacement blowers based on the required airflow and pressure characteristics.
3. **Motor Selection**: Select a motor with appropriate horsepower and speed to match the blower's requirements.
4. **Sizing**: Calculate the blower size based on the airflow and pressure requirements, using manufacturer performance curves.
5. **Design Parameters**: Define dimensions, blade design, and materials based on the application and environment.

For connecting two blowers to a motor:

1. **Parallel Connection**: Connect both blowers in parallel to increase airflow while maintaining the same pressure.
2. **Series Connection**: Connect blowers in series to increase pressure while maintaining the same airflow.

Ensure the motor can handle the combined load of the blowers in either configuration.


The automotive industry is a global powerhouse, one of the world’s largest economic sectors by revenue. It comprises a wide range of companies and organizations involved in every stage of a motor vehicle’s life cycle. This includes not only the well-known vehicle manufacturers (OEMs) but also a massive network of component suppliers, dealerships, repair and maintenance shops, and financial service providers. The term “automotive” itself, derived from the Greek “autos” (self) and Latin “motivus” (of motion), perfectly captures the essence of a self-powered vehicle.

For decades, the industry’s business model was centered on the production and sale of internal combustion engine (ICE) vehicles. However, a revolutionary transformation is underway, driven by a confluence of technological advancements and shifting consumer demands. Today, the automotive landscape is defined by four key trends: electrification, autonomous driving, connectivity, and shared mobility.

Electrification, particularly the rise of Battery Electric Vehicles (BEVs), is a major disruptor. Fueled by growing environmental concerns, stricter emissions regulations, and improving battery technology, the shift to electric vehicles is reshaping everything from manufacturing processes to the global energy grid. Autonomous driving technology, while still in its developmental stages, promises a future where vehicles can operate with minimal or no human intervention. This is driven by advances in artificial intelligence, machine learning, and sensor technology, with the potential to dramatically improve road safety and efficiency.

Connectivity is transforming the vehicle from a simple mode of transportation into a “software-defined vehicle”—an extension of our digital lives. Cars are now equipped with advanced infotainment systems, telematics, and over-the-air update capabilities, which enable new services and business models, like subscription-based features. Finally, shared mobility services, such as ride-hailing and car-sharing, are challenging the traditional model of individual vehicle ownership, particularly in dense urban environments.

The automotive industry’s future is a convergence of these trends, moving beyond just manufacturing cars to providing comprehensive “mobility services.” This shift presents both immense challenges, such as supply chain resilience and a need for new skill sets, and significant opportunities for innovation and growth.

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