Which option describes the NR power-off continuous operation torque range?

Which option describes the NR power-off continuous operation torque range?

• A. 90%
• B. 90-110%
• C. 80%
• D. 110% max

Answer: (B)

Think of how much torque the system can safely sustain when it isn’t being driven by power. The design needs a tolerance around the nominal torque to account for things like friction, wear, temperature, and small variations in manufacturing. A symmetric band around the rated value, from 90% to 110%, gives that safe headroom: you stay within the limits while still operating continuously even with those small changes. The other options don’t express a continuous safe band around the nominal torque. A single 90% is just a lower bound, 80% is too low for safe continuous operation, and 110% max only states an upper limit without describing a usable range.

Think of how much torque the system can safely sustain when it isn’t being driven by power. The design needs a tolerance around the nominal torque to account for things like friction, wear, temperature, and small variations in manufacturing. A symmetric band around the rated value, from 90% to 110%, gives that safe headroom: you stay within the limits while still operating continuously even with those small changes.

The other options don’t express a continuous safe band around the nominal torque. A single 90% is just a lower bound, 80% is too low for safe continuous operation, and 110% max only states an upper limit without describing a usable range.