Red Seal Electrician Practice
MotorsQuestion 351 of 1506

What does the locked-rotor code letter on a nameplate describe?

  1. Locked-rotor kVA per horsepower
  2. Full-load current in amperes per phase
  3. The insulation class of the motor windings
  4. The service factor for short-term overloads
Show answer

Correct answer: Locked-rotor kVA per horsepower

A later letter means a higher locked-rotor kVA per hp, which may affect starter selection.

Source: Troubleshooting Motors and Controls (Dickson-Self), 6.1: Testing Motor Components

Practice motors

Questions last reviewed: 18 October 2026