What is not an equipment found on the roof of a MOTOR car?

A compressor is not typically found on the roof of a motor car. In traction systems, the roof of the motor car is primarily utilized for components that facilitate overhead power collection and communication.

The pantograph, for instance, is a device that extends to connect with the overhead wires, allowing the train to draw electricity for propulsion. Antennas are also common on roofs for communication purposes, ensuring connectivity for operational control and safety systems. Surge arrestors, while related to electrical systems, are installed to protect electrical equipment from surges caused by lightning strikes or other power disruptions, and they may be part of the electrical installation on the roof.

In contrast, compressors, which are generally associated with air conditioning systems, are typically housed within the car body rather than on the roof, making them less relevant to the exterior components of a motor car’s design.