Which drivetrain configuration uses two sources for propulsion, allowing power to be delivered by both sources simultaneously?

Which drivetrain configuration uses two sources for propulsion, allowing power to be delivered by both sources simultaneously?

• A. 3-phase series drive
• B. Full electric drive
• C. Series hybrid drive
• D. Parallel hybrid drive

Answer: (D)

Two propulsion sources powering the wheels at the same time is the hallmark of a parallel hybrid drive. In this setup, both the internal combustion engine and an electric motor have a direct path to the drivetrain, and the system can blend torque from both so power can be delivered simultaneously. This arrangement lets the vehicle use electric power for smooth, low-speed operation and also draw on the engine (and both together when needed) for greater acceleration or longer range. By contrast, a series hybrid uses the engine only to generate electricity for the wheels, so the engine doesn’t directly propel the vehicle. A full electric drive relies entirely on electric propulsion with no engine power source. The term “3-phase series drive” isn’t a standard configuration for two-source propulsion and wouldn’t describe the same simultaneous power delivery.

Two propulsion sources powering the wheels at the same time is the hallmark of a parallel hybrid drive. In this setup, both the internal combustion engine and an electric motor have a direct path to the drivetrain, and the system can blend torque from both so power can be delivered simultaneously. This arrangement lets the vehicle use electric power for smooth, low-speed operation and also draw on the engine (and both together when needed) for greater acceleration or longer range. By contrast, a series hybrid uses the engine only to generate electricity for the wheels, so the engine doesn’t directly propel the vehicle. A full electric drive relies entirely on electric propulsion with no engine power source. The term “3-phase series drive” isn’t a standard configuration for two-source propulsion and wouldn’t describe the same simultaneous power delivery.