Which of the following is a type of door-latch?

The choice of U-bolt as a type of door-latch is not accurate, as it is typically used for securing items rather than functioning as a latch for doors. A pin latch, rotary latch, and spring latch are all recognized mechanisms that act to keep a door closed by engaging with a strike plate or receiver.

A pin latch uses a pin that slides into a hole or notch to secure a door, providing a straightforward and effective method for door closure. A rotary latch employs a rotating mechanism that engages a strike when the door is closed, enhancing security and stability. A spring latch functions by using a spring-loaded mechanism that automatically engages when the door is closed, allowing for quick operation without requiring additional mechanisms.

Understanding these mechanisms is essential for vehicle rescue situations, as knowing various latch types influences how responders approach door access during rescues or extrications. Each type of latch operates differently, which can significantly affect techniques used in emergency scenarios.