Final Answer:
Helical rotors revolve at speeds up to 2550 r/min. Thus option B is correct.
Step-by-step explanation:
Helical rotors are designed to operate within specific rotational speeds to ensure optimal performance and efficiency. In this case, the correct speed for helical rotors is indicated by option B) 2550 r/min. The rotational speed of these rotors is crucial as it directly impacts their functionality, including their ability to generate the required forces or movements efficiently.
The rotational speed of helical rotors is determined by various factors such as the design of the equipment, the intended application, and the desired output. Engineers and manufacturers calculate these speeds considering the helix angle, gear ratios, and operational requirements. The specified speed of 2550 r/min in this context ensures the proper functioning and performance of the helical rotors within the given system.
To understand the rotational speed's significance, it's important to note that higher or lower speeds than the specified range might lead to operational issues. For instance, excessive speed could cause excessive wear and tear or even structural damage to the rotors. Conversely, operating at lower speeds might result in inefficiencies or insufficient output for the intended application.
Therefore, the designated speed of 2550 r/min is crucial for helical rotors, ensuring they function optimally, maintain efficiency, and meet the desired operational requirements without compromising their longevity or performance. Thus option B is correct.