Sae Quiz On Conducted Workshops

Turbochargers are known to have turbo lag, which is the delay in the engine's response when the driver presses the accelerator pedal. This lag occurs because the turbocharger needs time to spool up and generate enough boost pressure to increase the engine's power output. Superchargers, on the other hand, do not suffer from turbo lag as they are driven directly by the engine's crankshaft and provide instant boost. Therefore, the correct answer is Turbocharger.

The calorific value of gaseous fuel is expressed in terms of Kcal/kg because it represents the amount of heat energy produced by burning one kilogram of the fuel. This unit is commonly used to compare the energy content of different gaseous fuels and is important in determining their efficiency and suitability for various applications.

The working cycle of a four-stroke engine is completed in two revolutions of the crankshaft. This is because each stroke of the engine (intake, compression, combustion, exhaust) requires one revolution of the crankshaft. Therefore, it takes two complete revolutions for the engine to complete all four strokes and complete one working cycle.

The main difference between screws and bolts is that nuts are used with bolts, not with screws. This means that bolts have a threaded shaft that requires a nut to secure it in place, while screws have their own threads and do not require a nut. This distinction is important when choosing the appropriate fastener for a specific application.

The given answer of 40% suggests that the maximum efficiency of IC (Internal Combustion) engines is 40%. This means that only 40% of the fuel's energy is converted into useful work, while the remaining 60% is lost as waste heat. IC engines have inherent limitations and cannot convert all the energy from fuel into useful work due to factors such as friction, heat transfer, and incomplete combustion. Therefore, the maximum efficiency achievable in these engines is 40%.

The function of a controller is to regulate or manage the amount of power that is supplied to the wheels. It is responsible for controlling the power output and ensuring that it is distributed appropriately to the wheels. This helps in maintaining stability, controlling speed, and ensuring proper traction while driving. The controller plays a crucial role in managing the power flow and optimizing the performance of the vehicle.

At high altitudes, the air density decreases, which affects the performance of a turbocharger. Turbolag refers to the delay in power delivery caused by the time it takes for the turbocharger to spool up and generate boost. As the air density decreases, it becomes harder for the turbocharger to compress the thinner air, resulting in increased turbolag. On the other hand, a supercharger does not rely on exhaust gases like a turbocharger, but instead uses engine power to compress air, making it more effective at high altitudes where the air is less dense. Therefore, superchargers are preferred over turbochargers in such conditions.

The inverter is used in electric vehicles to convert the alternating current (AC) from the battery or power source into direct current (DC) that can be used by the electric motor. Electric motors in vehicles typically run on DC power, so the inverter is necessary to ensure compatibility and efficient operation. By converting the AC current into DC, the inverter allows for the smooth and controlled delivery of power to the motor, enabling the vehicle to move efficiently and effectively.

The frequency in an electric vehicle is controlled with the help of a controller. The controller regulates the power flow from the battery to the motor, which in turn determines the frequency of the electrical signals sent to the motor. By adjusting the controller settings, the frequency can be controlled to optimize the performance of the electric vehicle.

The function of a fuel pump is to deliver the right quantity of fuel at the right time. This is important for ensuring that the engine receives the necessary amount of fuel for combustion. The fuel pump is responsible for pumping fuel from the fuel tank to the engine, maintaining consistent fuel pressure, and delivering fuel in the correct amount and timing to meet the engine's demands.

The air fuel ratio of petrol engines is controlled by the carburetor. A carburetor is a device that mixes air and fuel in the correct proportions before it enters the engine. It regulates the flow of fuel into the engine based on the amount of air entering the engine, ensuring an optimal air fuel mixture for combustion. The carburetor controls the air fuel ratio by adjusting the size of the fuel jets or by using a mixture control screw to adjust the flow of fuel.

The self-ignition temperature of a diesel engine is lower compared to a petrol engine. This means that diesel fuel is more prone to spontaneous combustion without the need for an external ignition source. This is due to the higher compression ratio in diesel engines, which increases the temperature inside the combustion chamber. As a result, diesel fuel ignites at a lower temperature compared to petrol, which requires a spark from a spark plug to ignite.

The flywheel is used to store rotational energy in an engine, acting as a reservoir of kinetic energy that helps to maintain the engine's rotational momentum during the power strokes. The crankshaft, on the other hand, converts the linear or translatory motion of the pistons into rotational motion, transferring the energy generated by the combustion process to the wheels of the vehicle.

The intake valve in a petrol engine is bigger than the exhaust valve because it allows for a larger volume of air-fuel mixture to enter the combustion chamber. This is important for efficient combustion and power generation in the engine. By having a larger intake valve, more air and fuel can be drawn into the cylinder during the intake stroke, resulting in a more complete combustion and better performance.

An average car typically has around 3500 fasteners. Fasteners are used to hold various components of a car together, such as panels, trim, and mechanical parts. These fasteners ensure that everything stays securely in place and can withstand the vibrations and movements of the car while driving. With numerous parts and components in a car, a significant number of fasteners are required to ensure structural integrity and safety.

The main input power in a supercharger is the output shaft of the engine. This means that the power to drive the supercharger is taken directly from the engine's output shaft, which is responsible for transmitting power to the wheels or other components of the vehicle. The supercharger uses this power to compress the incoming air and increase its density, resulting in improved engine performance and increased horsepower.

The round head type is represented by Option 2.

In 1834, the first electric vehicle was built. This indicates that electric vehicles have been around for a longer time than many people may think. The development of electric vehicles began in the early 19th century, and this early creation showcases the early efforts to harness electricity for transportation purposes. By understanding this historical context, we can appreciate the long-standing history of electric vehicles and the progress that has been made in the field over the years.

The gear ratio between the camshaft and crankshaft can be 1:2, which means that for every two revolutions of the crankshaft, the camshaft completes one revolution. This ratio is commonly used in engines to synchronize the opening and closing of the valves with the movement of the pistons.

In a naturally aspirated diesel engine, the air is supplied by a vacuum chamber. This chamber creates a partial vacuum, which allows atmospheric pressure to push air into the engine's cylinders. The intake stroke of the engine creates a pressure difference, causing the air to flow from the vacuum chamber into the cylinders. This process helps in the combustion of fuel and the generation of power in the engine.

The length of the crankshaft is maximum in an incline engine. In an incline engine, the cylinders are arranged in a V-shaped configuration, with a larger angle between them compared to a V engine. This larger angle allows for a longer crankshaft to connect the pistons and convert their linear motion into rotational motion. In contrast, a V engine has a smaller angle between the cylinders, resulting in a shorter crankshaft. Therefore, the incline engine has the maximum length of the crankshaft among the options given.

The compression of a self-ignition engine is typically higher, ranging from 15 to 20, compared to a spark ignition engine which has a compression ratio of 8 to 10. This is because self-ignition engines rely on the heat generated by compressing the air-fuel mixture to ignite it, whereas spark ignition engines use a spark plug to initiate combustion. Higher compression ratios in self-ignition engines help achieve better fuel efficiency and power output.

The correct answer includes all the components that are related to the engine, gear box, transmission, transmission box, wheel, tire, and clutch. These components are essential for the functioning of a vehicle.

A supercharger is more efficient than a turbocharger because it is directly driven by the engine, whereas a turbocharger uses the engine's exhaust gases to spin a turbine. This means that a supercharger does not suffer from turbo lag, which is the delay in power delivery caused by the time it takes for the exhaust gases to spin the turbine. Additionally, a supercharger provides a more immediate and linear power delivery, whereas a turbocharger's power delivery can be more unpredictable and peaky. Overall, a supercharger offers better efficiency and performance.

In an electric vehicle, the weight is distributed evenly due to the placement of the battery pack along the bottom of the vehicle. This results in better traction as the weight is evenly distributed among all four tires, allowing for better grip and stability. In contrast, conventional IC engine vehicles have a heavier front end due to the engine placement, which can lead to uneven weight distribution and reduced traction.

The suspension system in a vehicle is responsible for providing a smooth and comfortable ride by absorbing shocks and vibrations from the road. It consists of various components that work together to achieve this, including the tyre air, linkage between the vehicle and wheel, and the damper. The tyre air helps in cushioning the vehicle from bumps and impacts, while the linkage connects the vehicle's chassis to the wheels, allowing for movement and flexibility. The damper, also known as a shock absorber, controls the movement of the suspension and helps in maintaining stability and control.

The intake valve in a diesel engine is bigger than the exhaust valve because it allows for a larger volume of air to enter the combustion chamber. This is important in a diesel engine because it relies on the compression of air to ignite the fuel. By allowing more air to enter, the engine can achieve a higher compression ratio, leading to more efficient combustion and increased power output.

The flywheel is responsible for providing momentum to the piston, allowing it to move from the bottom dead center (BDC) to the top dead center (TDC) after one cycle. The flywheel stores kinetic energy during the power stroke and releases it during the compression stroke, ensuring a smooth and continuous movement of the piston. This helps maintain the engine's rotational momentum and ensures that the piston does not lose momentum during the combustion process.

The correct answer is Engine and Wheel because both Engine and Wheel are components or parts of a larger system or section. In this case, they are sub-sections of a larger system or section. The other options, Differential and Universal Joint, are not sub-sections but rather separate components or parts.

The question asks for the component that is not part of the Coilover Spring. The options given are Damper, Trut, Coil Spring, and None of these. The correct answer is "None of these" because all the options listed (Damper, Trut, and Coil Spring) are components of the Coilover Spring. Therefore, there is no component that is not part of the Coilover Spring.

The correct answer is 1843. This means that the first IC Engine was patented in 1843.

Piston rings have multiple functions. First, they seal the combustion chamber, ensuring that there is minimal loss of gases to the crankcase. This helps to maintain proper compression and prevent leakage. Second, piston rings improve heat transfer from the piston to the cylinder wall, aiding in cooling the engine. Third, they help maintain the proper quantity of oil between the piston and the cylinder wall, ensuring proper lubrication. Finally, piston rings regulate engine oil consumption by scraping excess oil from the cylinder walls back to the sump, preventing excessive oil consumption.

The given answer, "None," is correct because the question presents statements that are all incorrect. Torque does not necessarily increase or decrease as we push the accelerator pedal, and power does not necessarily increase or decrease either. The correct relationship between torque, power, and the accelerator pedal depends on the specific engine and transmission system of the vehicle. Therefore, none of the statements provided in the question are true.