E-bike Design And Manufacturing Test
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Questions and Answers
- 1.
What is the cell voltage of Lead-Acid battery?
- A.
2.0V
- B.
3.6V
- C.
9V
- D.
12V
Correct Answer
A. 2.0VExplanation
The cell voltage of a Lead-Acid battery is 2.0V. This is a common voltage for Lead-Acid batteries, which are commonly used in automotive applications. Each individual cell within the battery has a voltage of 2.0V, and multiple cells are connected in series to achieve higher voltages, such as 12V for a car battery.Rate this question:
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- 2.
For a 48V powertrain, consisting of 3.7V nominal cells with 3.2V and 4.2V as extreme voltages, what will be the charging voltage?
- A.
48V
- B.
52V
- C.
55V
- D.
60V
Correct Answer
C. 55VExplanation
The charging voltage for a 48V powertrain with 3.7V nominal cells and 3.2V and 4.2V as extreme voltages would be 55V. This is because the charging voltage needs to be higher than the highest voltage (4.2V) of the cells in order to charge them effectively. Therefore, 55V would be the appropriate charging voltage for this powertrain.Rate this question:
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- 3.
For an SLA battery, the capacity is 20Ah in C10 rating. What will be the capacity in C20?
- A.
Will be more
- B.
Will be Less
- C.
Will be same
- D.
Will double
Correct Answer
A. Will be moreExplanation
The capacity of an SLA battery refers to the amount of charge it can hold. In this case, the capacity is given as 20Ah in C10 rating, which means that the battery can deliver 20 amps of current for 10 hours. When the C rating is increased to C20, it indicates that the battery will be discharged over a longer period of time, in this case, 20 hours. Therefore, the capacity of the battery will be more in C20 rating because it is able to deliver the same amount of charge over a longer period of time.Rate this question:
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- 4.
Which is not a function of BMS?
- A.
Cell Balancing
- B.
Voltage Protection
- C.
Battery Cooling
- D.
Current Monitoring
Correct Answer
C. Battery CoolingExplanation
Battery Cooling is not a function of BMS. BMS stands for Battery Management System, which is responsible for monitoring and controlling various aspects of a battery, such as cell balancing, voltage protection, and current monitoring. However, cooling of the battery is typically not a direct function of the BMS. Cooling is usually achieved through separate cooling systems or mechanisms designed specifically for that purpose.Rate this question:
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- 5.
A 48V 3kWh pack can discharge 250A peak current. What is the rating of motor?
- A.
3kW
- B.
6kW
- C.
9kW
- D.
12kW
Correct Answer
D. 12kWExplanation
The rating of the motor is 12kW because the power rating of the motor should be equal to or greater than the power rating of the battery pack. The power rating of the battery pack is given as 3kWh, which is equivalent to 3kW. Since the motor needs to be able to handle the peak current of 250A, it should have a power rating of at least 12kW to ensure it can handle the load.Rate this question:
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- 6.
BLDC motors are powered by
- A.
Direct Current
- B.
Single Phase AC
- C.
Two Phase AC
- D.
Three Phase AC
Correct Answer
D. Three Phase ACExplanation
BLDC motors are powered by three-phase AC. This is because three-phase AC provides a more efficient and smoother power delivery compared to single-phase or two-phase AC. The three phases of AC power ensure a continuous and balanced supply of electricity to the motor, resulting in better performance and reduced vibrations. Additionally, three-phase AC motors have higher torque capabilities and are widely used in various industrial applications due to their reliability and power efficiency.Rate this question:
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- 7.
Speed of the motors are controlled by
- A.
Current
- B.
Voltage
- C.
Power
- D.
Capacity
Correct Answer
B. VoltageExplanation
The speed of motors is controlled by voltage. Voltage is the electrical potential difference that determines the flow of electric current. By adjusting the voltage supplied to the motor, the speed of the motor can be controlled. Higher voltage will result in a higher speed, while lower voltage will result in a lower speed. Therefore, voltage plays a crucial role in determining the speed of motors.Rate this question:
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- 8.
Torque of motor is controlled by
- A.
Current
- B.
Voltage
- C.
Power
- D.
Capacity
Correct Answer
A. CurrentExplanation
The torque of a motor is controlled by the current flowing through it. As the current increases, the magnetic field produced by the motor also increases, resulting in a higher torque output. Conversely, reducing the current will decrease the torque generated by the motor. Therefore, the correct answer is current.Rate this question:
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- 9.
A 200kg motorcycle with rider needs to accelerate 0-60kph in 10 seconds. What should be the motor rating?
- A.
3kW
- B.
6kW
- C.
9kW
- D.
12kW
Correct Answer
B. 6kWExplanation
The motor rating should be 6kW because it needs to provide enough power to accelerate the 200kg motorcycle with rider from 0 to 60kph in 10 seconds. A higher motor rating would provide more power, allowing for faster acceleration, but it would also consume more energy. A lower motor rating may not provide enough power to achieve the desired acceleration within the given time frame. Therefore, a 6kW motor rating strikes a balance between power and energy efficiency.Rate this question:
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- 10.
A Diesel locomotive powertrain consists of
- A.
Series Hybrid Architecture
- B.
Parallel Hybrid Architecture
- C.
Series Parallel Hybrid Architecture
- D.
Plugin Hybrid Architecture
Correct Answer
A. Series Hybrid ArchitectureExplanation
The correct answer is Series Hybrid Architecture. In a series hybrid architecture, the diesel engine is used solely to generate electricity, which is then used to power the electric motor that drives the locomotive. This allows for greater flexibility in the powertrain, as the diesel engine can run at a constant speed, optimizing fuel efficiency. Additionally, the electric motor provides instant torque, making it ideal for applications that require high pulling power, such as locomotives.Rate this question:
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- 11.
Why gearboxes are used for ICE vehicles?
- A.
Inefficiency
- B.
Narrow torque band
- C.
Limited speed
- D.
Idling losses
Correct Answer
B. Narrow torque bandExplanation
Gearboxes are used for ICE vehicles because they help to overcome the narrow torque band of internal combustion engines. ICE engines have a limited range of RPM where they produce maximum torque, and this can lead to inefficient performance at other speeds. By using a gearbox, different gear ratios can be selected to match the engine's torque output with the vehicle's speed requirements, allowing the engine to operate more efficiently across a wider range of speeds. This improves overall performance and fuel efficiency of the vehicle.Rate this question:
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- 12.
Automatic Scooters have
- A.
Centrifugal Clutch
- B.
Continuous Variable Transmission
- C.
Belt Drive
- D.
All of the above
Correct Answer
D. All of the aboveExplanation
Automatic scooters have all of the above features. A centrifugal clutch is used in automatic scooters to engage and disengage the engine power to the transmission. Continuous Variable Transmission (CVT) is a type of transmission that allows for seamless and continuous gear ratio changes, providing smooth acceleration. Belt drive is commonly used in automatic scooters to transfer power from the engine to the wheels. Therefore, all of these features are present in automatic scooters.Rate this question:
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- 13.
How can the life of the battery of an EV be increased?
- A.
Fast Charging
- B.
Use 100% DoD
- C.
Use mid part of charge
- D.
Deep discharge
Correct Answer
C. Use mid part of chargeExplanation
Using the mid part of charge can help increase the life of the battery of an EV. This is because constantly charging the battery to 100% or fully discharging it can put stress on the battery cells, leading to a decrease in its overall lifespan. By charging the battery to only the mid part of its capacity, it reduces the strain on the battery and helps prolong its life. This practice is often recommended for EV owners to optimize the longevity of their battery.Rate this question:
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- 14.
Which among the following is not load on motor in an EV?
- A.
Vehicle and rider weight
- B.
Wind speed
- C.
Terrain Gradient
- D.
Rolling Resistance
Correct Answer
B. Wind speedExplanation
Wind speed is not a load on the motor in an electric vehicle (EV) because it does not directly impact the power required to propel the vehicle. The load on the motor is primarily determined by factors such as the vehicle and rider weight, terrain gradient, and rolling resistance. Wind speed may affect the overall aerodynamics and efficiency of the vehicle, but it does not directly add to the load on the motor.Rate this question:
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- 15.
For a 48V 20Ah battery pack, how many 9Wh cells be required?
- A.
92
- B.
97
- C.
102
- D.
107
Correct Answer
D. 107Explanation
To find out how many 9Wh cells are required for a 48V 20Ah battery pack, we need to calculate the total energy capacity of the battery pack. The formula to calculate energy capacity is Voltage (V) multiplied by Ampere-hours (Ah). In this case, the energy capacity would be 48V multiplied by 20Ah, which equals 960Wh. To find out how many 9Wh cells are needed, we divide the total energy capacity (960Wh) by the capacity of each cell (9Wh). The result is 107, which means that 107 9Wh cells would be required for the battery pack.Rate this question:
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- 16.
Which among is a characteristic of a streetfighter motorcycle?
- A.
Shorter Wheelbase
- B.
Aggressive Rake
- C.
Stiffer Suspension
- D.
All of the above
Correct Answer
D. All of the aboveExplanation
A streetfighter motorcycle typically exhibits all of the mentioned characteristics. A shorter wheelbase allows for better maneuverability and quick turns, making it suitable for urban riding. An aggressive rake refers to the angle of the front forks, which contributes to the bike's aggressive and sporty appearance. Lastly, stiffer suspension enhances the bike's handling and stability at high speeds, ensuring a smooth ride even on rough terrains. Therefore, all of these characteristics are commonly found in streetfighter motorcycles.Rate this question:
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- 17.
What is the advantage of higher voltage powertrain?
- A.
Higher Current
- B.
More Power
- C.
Cooler Electricals
- D.
Higher Efficiency
Correct Answer
C. Cooler ElectricalsExplanation
Higher voltage powertrain allows for a reduction in the current required to deliver the same amount of power. This leads to lower heat generation in the electrical components, resulting in cooler electricals. Cooler electricals have several advantages, including improved reliability, longer lifespan, and reduced risk of overheating or electrical failures. Additionally, cooler electricals contribute to overall system efficiency by minimizing energy losses due to heat dissipation. Therefore, the advantage of a higher voltage powertrain is cooler electricals.Rate this question:
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- 18.
Which among these is not an Electric Motorcycle Manufacturer?
- A.
Ultraviolette
- B.
Orxa
- C.
Tork
- D.
Ather
Correct Answer
D. AtherExplanation
Ather is not an Electric Motorcycle Manufacturer.Rate this question:
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- 19.
A 200kg motorcycle with rider needs to accelerate 0-60kph in 10 seconds. if you have a motor producing 50Nm, what should be the drive ratio for the wheel diameter of 640mm?
- A.
4.2
- B.
4.7
- C.
5.2
- D.
5.7
Correct Answer
C. 5.2Explanation
The drive ratio determines the relationship between the torque produced by the motor and the force applied to the wheel. In this question, the motor produces 50Nm of torque. To accelerate the motorcycle from 0-60kph in 10 seconds, a higher drive ratio is required to generate more force at the wheel. A higher force will result in greater acceleration. Therefore, the correct answer is 5.2, as it provides the necessary drive ratio to achieve the desired acceleration.Rate this question:
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- 20.
For electricity-water analogy, voltage is denoted by
- A.
Pressure Head
- B.
Pressure Head
- C.
Potential Head
- D.
None of the above
Correct Answer
C. Potential HeadExplanation
In the electricity-water analogy, voltage is represented by "Potential Head". Potential head is a term used in fluid dynamics to describe the potential energy per unit weight of a fluid at a certain point. Similarly, voltage represents the potential energy per unit charge in an electrical circuit. Therefore, potential head is the correct term to denote voltage in the electricity-water analogy.Rate this question:
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- 21.
Which among the following is not a major component in Electric powertrain?
- A.
Battery
- B.
Motor
- C.
Controller
- D.
Charger
Correct Answer
D. ChargerExplanation
The charger is not a major component in an electric powertrain. The battery is responsible for storing and supplying power, the motor converts electrical energy into mechanical energy, and the controller manages the flow of electricity. However, the charger is not directly involved in the powertrain system. Its main function is to recharge the battery when it is depleted.Rate this question:
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- 22.
EV level 1 charger is
- A.
Single Phase AC
- B.
Three Phase AC
- C.
High Voltage DC
- D.
None of the above
Correct Answer
A. Single Phase ACExplanation
The correct answer is Single Phase AC. An EV level 1 charger refers to a basic charger that uses a single-phase alternating current (AC) power supply to charge electric vehicles. Single-phase AC is commonly used in residential settings and provides a lower charging power compared to three-phase AC or high voltage DC chargers.Rate this question:
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- 23.
Fast charging stations are
- A.
Single Phase AC
- B.
Three Phase AC
- C.
High Voltage DC
- D.
None of the above
Correct Answer
C. High Voltage DCExplanation
Fast charging stations are typically equipped with high voltage DC chargers. These chargers allow for faster charging times compared to single phase or three phase AC chargers. High voltage DC chargers can deliver a higher amount of power to the electric vehicle's battery, resulting in quicker charging. This makes them more suitable for fast charging applications where time is of the essence.Rate this question:
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- 24.
Smart batteries have
- A.
IoT
- B.
CAN
- C.
RFID
- D.
Ethernet
Correct Answer
B. CANExplanation
Smart batteries have CAN (Controller Area Network) communication capabilities. CAN is a widely used network protocol that allows different electronic devices within a system to communicate with each other. In the case of smart batteries, CAN enables them to exchange information and data with other devices, such as battery chargers or monitoring systems. This communication allows for more efficient and effective battery management, monitoring, and control.Rate this question:
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- 25.
In any EV, with sophisticated algorithm, the highest power is delivered at
- A.
Initial Pickup
- B.
Midrange Cruising
- C.
Top Speed
- D.
Equal power throughout
Correct Answer
C. Top SpeedExplanation
The correct answer is "Top Speed." In an electric vehicle (EV) with a sophisticated algorithm, the highest power is delivered at top speed. This means that the EV is designed to provide maximum power output when it is operating at its highest speed capability. This is important for achieving optimal performance and efficiency during high-speed driving conditions.Rate this question:
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- 26.
Which type of frame is best suited for Electric Motorcycles?
- A.
Cradle Frame
- B.
Diamond Frame
- C.
Trellis Frame
- D.
None of the above
Correct Answer
C. Trellis FrameExplanation
The trellis frame is best suited for electric motorcycles because it offers a lightweight and rigid structure. This type of frame consists of a network of small diameter tubes that are welded together, providing excellent strength and stability. The trellis frame also allows for easy customization and modification, making it ideal for electric motorcycles that may require specific design adjustments to accommodate the battery and motor components. Additionally, the trellis frame offers good handling and maneuverability, which is important for electric motorcycles to ensure a smooth and enjoyable riding experience.Rate this question:
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- 27.
Hub motors are best suited for
- A.
Electric Scooters
- B.
Electric Motorcycles
- C.
Electric Cars
- D.
Electric Buses
Correct Answer
A. Electric ScootersExplanation
Hub motors are best suited for electric scooters because they offer a compact and efficient design. Hub motors are integrated into the wheels of the scooter, providing direct power and eliminating the need for complex transmission systems. This makes them ideal for smaller vehicles like scooters, as they take up less space and allow for better maneuverability. Additionally, hub motors provide good torque and acceleration, which is important for scooters that often require quick starts and stops in urban environments.Rate this question:
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- 28.
Which among are best suiter for Regen braking
- A.
Batteries
- B.
Flywheels
- C.
Ultra capacitors
- D.
All of the above
Correct Answer
C. Ultra capacitorsExplanation
Ultra capacitors are best suited for regen braking because they are capable of rapidly storing and releasing energy, making them ideal for capturing and storing the energy generated during braking. Batteries and flywheels can also be used for regen braking, but ultra capacitors are more efficient and have a higher power density, allowing them to quickly absorb and release large amounts of energy in a short period of time. Therefore, ultra capacitors are the best choice for regen braking.Rate this question:
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- 29.
Sprockets are mostly subjected to
- A.
Thermal Stress
- B.
Sheer Stress
- C.
Torsional Stress
- D.
Tension
Correct Answer
C. Torsional StressExplanation
Sprockets are primarily subjected to torsional stress. Torsional stress occurs when a force is applied to an object causing it to twist or rotate. In the case of sprockets, they are typically used in machinery and are responsible for transmitting rotational motion between two shafts with the help of a chain. As the chain engages with the sprocket teeth, it applies a twisting force on the sprocket, resulting in torsional stress. This stress can lead to deformation or failure of the sprocket if it exceeds its maximum torsional strength.Rate this question:
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- 30.
In Solidworks, which feature is best suited to make frames
- A.
Extrude
- B.
Sweep
- C.
Weldments
- D.
Loft
Correct Answer
C. WeldmentsExplanation
Weldments is the best feature in Solidworks to make frames. Weldments allow users to create structural frames by defining the members, connections, and joints. This feature provides a wide range of tools and options for designing and creating complex frame structures with ease. It offers the ability to add different types of structural members, such as beams, tubes, and plates, and also provides options for adding weld beads and annotations. Overall, the Weldments feature is specifically designed for creating frames and is the most suitable option for this purpose in Solidworks.Rate this question:
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