Search Previous Year Questions

The Correct answer is Fuel Injector.

Key Points

• A fuel injector is responsible for atomizing the fuel in diesel engines.
• It ensures the precise and controlled delivery of atomized fuel into the combustion chamber.
• The fuel injector sprays the fuel at a high pressure, which allows the fuel to mix effectively with air for efficient combustion.
• In diesel engines, the combustion process relies on compression ignition, where the atomized fuel is ignited by the heat generated during compression.
• The design of a fuel injector includes nozzles to create fine droplets of fuel for better mixing with air.
• Fuel injectors play a critical role in enhancing the performance, fuel efficiency, and emission control of diesel engines.
• Modern fuel injectors are designed to be highly precise, reducing fuel wastage and contributing to cleaner emissions.
• Fuel injectors are integral components in common rail diesel engines, which are widely used in automobiles and heavy machinery.

Additional Information

• Engine Pump
• The term engine pump is generic and can refer to various types of pumps used in an engine, such as an oil pump or coolant pump, but it is not involved in fuel atomization.
• Its primary function is to circulate fluids like oil or coolant to maintain engine operations and temperature control.
• Fuel Pump
• The fuel pump is responsible for transferring fuel from the fuel tank to the engine.
• It does not atomize fuel but ensures that the fuel reaches the injector at the required pressure.
• Fuel pumps are commonly found in both diesel and gasoline engines, supporting the fuel delivery system.
• Fuel Feed Pump
• The fuel feed pump is a type of pump used to transfer fuel from the tank to the injection pump in diesel engines.
• Its function is limited to moving fuel through the system and does not involve atomization.
• Fuel feed pumps are typically used in older diesel engine designs.

The correct answer is Cl.

Key Points

• Cl, or Chlorine, is not a part of the typical exhaust emissions of a vehicle.
• Vehicle exhaust emissions primarily consist of substances that result from the combustion of fossil fuels in internal combustion engines.
• Chlorine is not involved in the fuel combustion process and is not released as a byproduct.
• Instead, substances like carbon monoxide (CO), nitrogen oxides (NOx), hydrocarbons, and others are common in exhaust emissions.
• The presence of Chlorine in significant quantities in vehicle exhaust would indicate an unusual or external source, such as a malfunction or contamination.
• Hence, Cl is not a natural component of vehicle emissions.

Additional Information

• NOx (Nitrogen Oxides)
• Nitrogen Oxides (NOx) are one of the major pollutants in vehicle exhaust.
• They are formed when nitrogen and oxygen in the air react at high temperatures during fuel combustion.
• NOx contributes to air pollution issues such as smog and acid rain.
• Hydrocarbons
• Hydrocarbons are unburnt or partially burnt fuel components released in vehicle emissions.
• They are a significant contributor to the formation of ground-level ozone and smog.
• Hydrocarbons are a result of incomplete combustion in the engine.
• CO (Carbon Monoxide)
• Carbon Monoxide (CO) is a colorless, odorless gas produced by the incomplete combustion of fuel.
• It is highly toxic to humans as it interferes with the body's ability to transport oxygen.
• CO is one of the primary pollutants regulated by emission standards worldwide.

The Correct answer is Slow down speed and proceed safely.

Key Points

• A flashing yellow signal light is a warning signal that indicates drivers should exercise caution.
• It advises drivers to slow down their vehicles and proceed through the intersection or area with heightened awareness of potential hazards.
• Unlike a red light, it does not require a full stop unless necessary for safety.
• This signal is commonly used in areas with low traffic density or at non-critical intersections.
• The purpose of the flashing yellow light is to remind drivers to be mindful of their surroundings and to ensure safety for pedestrians and other vehicles.
• Such signals are often installed in areas where the traffic flow needs to be maintained but with a lower speed to prevent accidents.
• This signal is an internationally recognized traffic regulation and is part of road safety measures in most countries, including India.

Additional Information

• Maintain current speed
• Maintaining the current speed without slowing down is not advisable when encountering a flashing yellow signal. It may lead to accidents if hazards or other vehicles are present.
• This option overlooks the precautionary nature of a flashing yellow light.
• Accelerate vehicle
• Accelerating at a flashing yellow signal is dangerous and against traffic regulations.
• It increases the risk of collisions, as the signal is meant to warn drivers to be cautious.
• Take left turn
• While a flashing yellow signal does not prohibit a left turn, it does not specifically indicate that drivers must take one.
• This option misinterprets the general purpose of the flashing yellow light, which is to proceed with caution.

The correct answer is 25% reduction.

Key Points

• BS-VI emission norms represent the stringent pollution control standards introduced by the Government of India to reduce vehicular emissions.
• The mandate under BS-VI norms requires petrol vehicles to reduce their nitrogen oxide (NOx) emissions by 25% compared to the previous BS-IV norms.
• Nitrogen oxides (NOx) are harmful pollutants that contribute to smog formation, acid rain, respiratory issues, and climate change.
• The reduction of NOx emissions under BS-VI norms is achieved through improved technologies such as advanced catalytic converters, better fuel injection systems, and engine recalibration.
• The implementation of BS-VI norms began on April 1, 2020, in India, and it marked a significant leap from BS-IV norms, skipping BS-V altogether.
• BS-VI fuel contains 10 ppm sulfur, which is significantly lower than BS-IV fuel, thereby supporting cleaner combustion and reduced emissions.
• The introduction of BS-VI norms aligns with India's commitment to mitigating climate change and improving air quality as part of its environmental policies and sustainable development goals.

Additional Information

• BS-VI Norms
• BS-VI stands for Bharat Stage VI, which is a set of regulations modeled after European emission standards.
• These norms aim to curb pollution by controlling the emissions from internal combustion engines in vehicles.
• BS-VI norms enforce limits on pollutants such as carbon monoxide (CO), hydrocarbons (HC), particulate matter (PM), and nitrogen oxides (NOx).
• Impact of NOx Emissions
• Nitrogen oxides are produced during high-temperature combustion processes, primarily in vehicles.
• These emissions contribute to the formation of ground-level ozone, which is harmful to human health.
• NOx also plays a role in forming fine particulate matter (PM2.5), which is linked to cardiovascular and respiratory diseases.
• Fuel Improvement
• BS-VI fuel contains lower sulfur levels, reducing the formation of harmful pollutants during combustion.
• The use of cleaner fuel is a critical aspect of achieving the emission reduction targets set by BS-VI norms.

The Correct answer is Airbag.

Key Points

• Airbags are an essential safety feature fitted inside modern four-wheeler vehicles.
• The primary function of an airbag is to provide a cushioning effect during a collision or accident, reducing the risk of severe injuries to the driver and passengers.
• Airbags are designed to deploy rapidly in case of a crash, using sensors that detect impact intensity.
• They help prevent direct contact between the occupants and the vehicle's interior components like the dashboard, steering wheel, and windows.
• Airbags are usually installed in the front (driver and passenger side), and some vehicles also include side airbags, curtain airbags, and knee airbags for enhanced protection.
• The use of airbags is mandated in many countries due to their proven effectiveness in reducing fatalities and injuries during road accidents.
• Airbags work in conjunction with seat belts, and both are necessary for optimal safety during a collision.
• According to global and regional road safety standards, airbags are a critical component of passive safety systems in vehicles.

Additional Information

• Hand Gloves
• Hand gloves are primarily used for protection during activities such as riding bikes, handling chemicals, or performing industrial tasks.
• They are not relevant to the safety of passengers or drivers in a four-wheeler vehicle.
• Helmet
• Helmets are essential safety gear for two-wheeler riders and are not typically used in four-wheelers.
• Helmets protect the head from injuries during accidents but are not applicable for four-wheeler vehicles equipped with airbags and seat belts.
• Face Shields
• Face shields are used for protection against hazards such as flying debris, chemical splashes, or infectious agents.
• They are not a component of automobile safety systems, especially in four-wheeler vehicles.

The Correct answer is Stop before stop line and treat it as a stop signal.

Key Points

• Stopping before the stop line ensures the safety of the pedestrian, as it allows them to cross without interference.
• The zebra crossing is specifically designed for pedestrian use and gives them the right of way to cross the road safely.
• By treating the situation as a stop signal, drivers demonstrate responsible driving practices and adhere to traffic rules.
• This behavior reduces the risk of accidents and ensures compliance with the Motor Vehicles Act or equivalent traffic regulations in the respective region.
• Stopping at the stop line also serves as a visual indicator for other drivers, encouraging them to slow down and respect the pedestrian crossing.
• It promotes a culture of road safety and mutual respect between pedestrians and drivers.

Additional Information

• Continue moving by ignoring him
• Ignoring a pedestrian on a zebra crossing is a violation of traffic rules and can lead to penalties.
• This action puts the pedestrian's safety at significant risk.
• You have to proceed before him
• Proceeding before the pedestrian contradicts the purpose of a zebra crossing, which grants the pedestrian the right of way.
• This behavior can result in legal consequences and endanger lives.
• Sound horn and speed up your vehicle to cross before him
• Honking and speeding up to cross before a pedestrian is reckless driving and is strictly prohibited by traffic regulations.
• This action creates unnecessary panic for the pedestrian and increases the chances of an accident.

The correct answer is Pollution Under Control.

Key Points

• Pollution Under Control (PUC) is a certification issued to vehicles to ensure that their emissions comply with the prescribed norms.
• It is mandated by the Government of India under the Central Motor Vehicles Rules, 1989 to regulate and control vehicular pollution.
• The PUC certificate is issued after conducting an emission test on the vehicle to check levels of pollutants such as carbon monoxide (CO) and hydrocarbons (HC).
• Vehicles that fail to meet the prescribed limits are required to undergo necessary repairs and retest to obtain a valid PUC certificate.
• The certificate is valid for a limited period, typically 6 months, after which it needs to be renewed.
• Having a valid PUC certificate is mandatory for all vehicles, including private and commercial vehicles, to ensure compliance with environmental standards.
• The initiative aims to reduce air pollution, which is a significant concern in urban areas due to the increasing number of vehicles.

Additional Information

• Pupil Under Control
• This term is not related to transportation; it could be a hypothetical or educational term referring to managing or disciplining students in an educational setting.
• Population Under Control
• This refers to measures taken to manage or stabilize population growth, often achieved through family planning programs or government policies.
• It has no direct relevance to vehicular or transport-related topics.
• People Under Control
• This phrase might imply a situation of governance or societal regulation but is unrelated to transportation or vehicular emissions.

The Correct answer is transmission.

Key Points

• The clutch is an essential component of the transmission system in vehicles.
• The primary function of the clutch is to engage and disengage the engine's power from the transmission system, allowing the driver to change gears smoothly.
• It helps in the transfer of power from the engine to the wheels of the vehicle.
• A clutch is typically used in manual transmission systems, where the driver operates it to change gears.
• It plays a crucial role in starting, stopping, and shifting gears while driving.
• The clutch mechanism generally consists of a clutch plate, pressure plate, release bearing, and flywheel.
• By disengaging the clutch, the engine can run independently without transmitting power to the wheels.

Additional Information

• Cooling System
• The cooling system is designed to regulate the engine's temperature and prevent it from overheating.
• It typically includes components like the radiator, water pump, thermostat, and coolant.
• By dissipating excess heat generated during combustion, the cooling system ensures the engine operates efficiently.
• Emission System
• The emission system is responsible for reducing harmful pollutants released by the vehicle.
• It includes components such as the catalytic converter, exhaust manifold, and oxygen sensors.
• This system ensures compliance with emission standards set by regulatory authorities.
• Lubrication System
• The lubrication system ensures that engine components are properly lubricated to reduce friction and wear.
• It includes components such as the oil pump, oil filter, and oil pan.
• This system also helps in cooling engine parts and preventing corrosion.

The Correct answer is 2000.

Key Points

• Euro emission standards are a set of regulatory measures aimed at controlling the emission of pollutants from vehicles.
• The implementation of these standards is essential for reducing the environmental impact of vehicular emissions.
• India adopted the Euro I standards in the year 2000 as a part of its efforts to combat air pollution.
• These standards were introduced nationwide in India, marking a significant move towards improving air quality and ensuring compliance with global environmental norms.
• The Euro norms regulate the emission of critical pollutants such as carbon monoxide (CO), hydrocarbons (HC), nitrogen oxides (NOx), and particulate matter (PM).
• Adoption of Euro standards in India also led to advancements in automobile technology, promoting the use of cleaner fuels and improved engine designs.
• The implementation of Euro norms paved the way for subsequent iterations, including Bharat Stage emission standards, which are modeled on Euro standards.

Additional Information

• 1999
• No significant nationwide emission standard was introduced in India in 1999.
• 2001
• India implemented stricter emission standards after 2000, but 2001 was not the year of initial implementation.
• 1998
• Emission standards were not implemented on a nationwide scale in India during 1998.

The Correct answer is The type of tyres used.

Key Points

• The type of tyres used is not a relevant factor in differentiating between a spark ignition (SI) engine and a compression ignition (CI) engine.
• Tyres are a part of the vehicle's design, not the engine's operational mechanism.
• The differentiation between SI and CI engines is based on factors such as fuel type, fuel entry mechanism, and ignition method, not external components like tyres.
• Both SI and CI engines can use the same tyre types depending on the vehicle's design and purpose, making this parameter unrelated to engine differences.
• This question highlights the importance of focusing on the engine's internal workings rather than unrelated vehicle components.

Additional Information

• The type of fuel used
• Spark Ignition (SI) engines typically use fuels like gasoline, which are more volatile and require an external ignition source (spark plug).
• Compression Ignition (CI) engines use fuels like diesel, which ignite due to high-pressure compression without the need for a spark plug.
• This fuel distinction is a key difference between the two engine types.
• The way the fuel enters the combustion chamber
• In SI engines, fuel enters the combustion chamber via a carburetor or fuel injection system that mixes air with fuel before delivering it.
• In CI engines, fuel is injected directly into the combustion chamber under high pressure, ensuring proper atomization and mixing.
• This mechanism is a critical factor in engine operation and efficiency.
• The way in which fuel is ignited
• SI engines rely on a spark plug to ignite the air-fuel mixture.
• CI engines ignite fuel through compression ignition, where high pressure and temperature cause spontaneous combustion.
• This ignition difference is a primary distinction between the two engine types.