What are the two types of seatbelt pre-tensioners?

What are the two types of seatbelt pre-tensioners?

• A. Manual and Automatic
• B. Electric and Mechanical
• C. Hydraulic and Electric
• D. Pneumatic and Mechanical

Answer: (B)

The concept being tested is how seatbelt pretensioners are activated. There are two main families based on how they tighten the belt: electric and mechanical. Electric pretensioners use an electric actuator or motor to pull the belt tight in a crash, while mechanical pretensioners rely on a mechanical linkage or spring-driven mechanism that tightens the belt when a crash signal is received. Both serve to remove slack in the belt to keep the occupant in a safer position, though they differ in their power source and actuation method. In this context, those are the two commonly recognized categories, which is why the best answer is electric and mechanical.

The concept being tested is how seatbelt pretensioners are activated. There are two main families based on how they tighten the belt: electric and mechanical. Electric pretensioners use an electric actuator or motor to pull the belt tight in a crash, while mechanical pretensioners rely on a mechanical linkage or spring-driven mechanism that tightens the belt when a crash signal is received. Both serve to remove slack in the belt to keep the occupant in a safer position, though they differ in their power source and actuation method. In this context, those are the two commonly recognized categories, which is why the best answer is electric and mechanical.