20+ Viswaat Chemicals Interview Questions and Answers

Electrification of an ICE vehicle requires significant changes to the powertrain and supporting systems.

• Removal of the internal combustion engine and installation of an electric motor

• Addition of a battery pack and associated electronics

• Modification of the transmission or installation of a new one

• Upgrades to the cooling and heating systems

• Changes to the braking system to enable regenerative braking

• Installation of charging infrastructure

• Redesign of the vehicle's body and chassi...read more

Minimum mandatory clearances between one aggregate and other dynamic aggregates.

• The minimum clearance depends on the size and speed of the aggregates.

• Clearances should be maintained to avoid collisions and damage to the aggregates.

• Clearances can be calculated using mathematical formulas and simulations.

• Examples of dynamic aggregates include vehicles, robots, and drones.

• Clearances should also take into account any obstacles or hazards in the environment.

Uneven weight distribution affects suspension by causing imbalance and uneven wear on tires and suspension components.

• Uneven weight distribution can cause the vehicle to pull to one side or the other

• It can also cause uneven wear on tires and suspension components

• This can lead to premature failure of suspension components and decreased handling and stability

• Proper weight distribution is important for optimal performance and safety

Weight distribution & GVW can be targeted by analyzing the vehicle's design, load capacity, and distribution of weight.

• Analyze the vehicle's design and load capacity to determine the maximum GVW

• Distribute the weight evenly across the vehicle to maintain stability

• Consider the type of cargo being transported and adjust weight distribution accordingly

• Ensure that the vehicle is not overloaded and is within legal weight limits

• Regularly inspect and maintain the vehicle to ensure pr...read more

DFMEA stands for Design Failure Mode and Effects Analysis. It is a systematic approach to identify and prevent potential failures in a product or process.

• DFMEA is a proactive risk assessment tool used during the design phase of a product or process.

• It involves identifying potential failure modes, their effects, and the likelihood of occurrence.

• The responsibility of creating DFMEA lies with the design team, but it requires input from cross-functional teams such as manufacturin...read more

The electric motor is mounted differently for front-wheel and rear-wheel drive vehicles.

• In front-wheel drive vehicles, the electric motor is mounted transversely, usually between the engine and the transmission.

• In rear-wheel drive vehicles, the electric motor is mounted longitudinally, usually behind the transmission.

• In some cases, electric motors can also be mounted directly on the wheels, known as in-wheel motors.

• The mounting position of the electric motor can affect the ve...read more

EV battery pack mounting requires proper placement, securing, and cooling to ensure safety and performance.

• Consider the weight and size of the battery pack and ensure it is mounted securely to prevent movement or damage during operation.

• Choose a location that allows for proper cooling and ventilation to prevent overheating.

• Use appropriate mounting hardware and techniques to ensure the battery pack is securely fastened to the vehicle.

• Consider the electrical connections and ens...read more

Factors to consider for selecting an EV motor

• Power and torque requirements

• Efficiency and energy consumption

• Size and weight constraints

• Cost and availability

• Compatibility with battery and controller

• Regenerative braking capability

• Maintenance and reliability

• Environmental impact

Parameters for vehicle integration job

• Compatibility of different vehicle systems

• Electrical and mechanical integration

• Safety regulations compliance

• Testing and validation

• Cost and time constraints

Vehicles are categorised as per AIS based on their type and usage. The standard to be referred is AIS-052.

• AIS categorises vehicles into various types such as M1, N1, L5, etc.

• The categorisation is based on factors such as weight, seating capacity, and usage.

• AIS-052 is the standard that specifies the requirements for the categorisation of vehicles.

• This standard also provides guidelines for the testing and certification of vehicles.

• For example, M1 category includes passenger car...read more

ADR angles are the angles between the axes of a vehicle's suspension system. They can be calculated using trigonometry and referred to industry standards.

• ADR stands for Australian Design Rules.

• The angles are important for ensuring proper handling and stability of the vehicle.

• Calculations involve measuring the angles of the suspension components and using trigonometry to determine the ADR angles.

• Industry standards such as ADR 31/01 and ADR 42/04 provide guidelines for ADR angl...read more

Factors affecting range of an EV

• Battery capacity and chemistry

• Vehicle weight and aerodynamics

• Driving behavior and terrain

• Temperature and climate

• Efficiency of regenerative braking

• Accessories and load on the battery

• Charging infrastructure and speed

• Tire pressure and maintenance

Five failure modes for an EV and their resolutions

• Battery failure - replace battery or repair

• Motor failure - replace motor or repair

• Charging failure - check charging port and cable, replace if necessary

• Brake failure - check brake system, replace brake pads or repair

• Software failure - update software or replace faulty components

Crash and rollover requirements for EVs are determined by various standards such as FMVSS, ECE, and GB.

• Crash and rollover requirements for EVs are determined by various standards such as FMVSS, ECE, and GB.

• FMVSS 305 is the standard for electric-powered vehicles, which includes requirements for post-crash safety, electrical isolation, and thermal management.

• ECE R100 is the European standard for electric vehicles, which includes requirements for crashworthiness, occupant prote...read more

Occupant packaging refers to the arrangement of occupants in a vehicle to ensure safety and comfort.

• Parameters to be considered include body size and shape, seating position, seatbelt usage, and airbag deployment.

• Occupant packaging is important for crash safety and can also affect passenger comfort and ergonomics.

• Examples of occupant packaging solutions include adjustable seats and headrests, seatbelt pre-tensioners, and airbag sensors.

• Occupant packaging is a key consideratio...read more

An electric vehicle requires several components or aggregates to function. These include the battery, motor, controller, charger, and more.

• Battery - stores energy to power the vehicle

• Motor - converts electrical energy into mechanical energy to propel the vehicle

• Controller - manages the flow of electricity between the battery and motor

• Charger - recharges the battery when needed

• Power electronics - converts DC power from the battery to AC power for the motor

• Transmission - transf...read more

Different suspension types include rigid, spring, hydraulic, and air suspension. Travel conditions refer to the range of motion of the suspension.

• Rigid suspension has no movement and is commonly found in bicycles

• Spring suspension uses metal coils to absorb shock and is commonly found in cars

• Hydraulic suspension uses fluid to absorb shock and is commonly found in heavy-duty vehicles

• Air suspension uses compressed air to adjust the height and stiffness of the suspension and is c...read more

Regenerative braking is a system that converts kinetic energy into electrical energy to recharge a vehicle's battery.

• It is commonly used in electric and hybrid vehicles.

• During braking, the electric motor acts as a generator, converting the kinetic energy into electrical energy.

• The electrical energy is then stored in the battery for later use.

• Regenerative braking helps to improve the overall efficiency of the vehicle and reduce energy waste.

• It also helps to extend the range of...read more

FAW & RAW can be calculated by dividing the total number of hours worked by the number of units produced.

• FAW stands for Full-time equivalent adjusted workload and RAW stands for Regular adjusted workload.

• To calculate FAW, divide the total number of hours worked by the number of hours in a full-time workweek.

• To calculate RAW, divide the total number of hours worked by the number of units produced.

• For example, if an employee worked 40 hours in a week and produced 100 units, the...read more

There are three types of electric vehicles: Battery Electric Vehicles, Plug-in Hybrid Electric Vehicles, and Hybrid Electric Vehicles.

• Battery Electric Vehicles (BEVs) run solely on electricity stored in batteries.

• Plug-in Hybrid Electric Vehicles (PHEVs) have both an electric motor and a gasoline engine, and can run on either power source.

• Hybrid Electric Vehicles (HEVs) have an electric motor and a gasoline engine, but the electric motor is only used to assist the gasoline eng...read more

H-Point is the hip point of a vehicle seat. It determines the seating position and ergonomics of the driver.

• H-Point is the pivot point of the human body where the thighs and torso meet.

• It is used to determine the position of the driver's seat in a vehicle.

• The H-Point is important for ensuring proper ergonomics and comfort for the driver.

• It is also used in crash testing to determine the position of the test dummy in the vehicle.

• The H-Point varies depending on the type of vehic...read more

Battery capacity can be determined by calculating the product of current and time.

• Calculate the current drawn by the device

• Determine the time for which the device will be used

• Multiply the current and time to get the battery capacity

• Consider the efficiency of the battery and the device while calculating capacity

There are three types of EV chargers: Level 1, Level 2, and DC fast chargers.

• Level 1 chargers use a standard 120-volt outlet and provide up to 4 miles of range per hour of charging.

• Level 2 chargers require a 240-volt outlet and provide up to 25 miles of range per hour of charging.

• DC fast chargers provide the fastest charging speeds, with up to 80% charge in 30 minutes.

• Examples of Level 1 chargers include the standard charging cable that comes with most EVs.

• Examples of Level 2...read more