MotorsQuestion 345 of 1506

A motor nameplate shows 1750 rpm and the motor produces 9 lb-ft of full-load torque. Using horsepower = speed × torque ÷ 5250, what is the horsepower?

3 hp
0.33 hp
9 hp
30 hp

Show answer

Correct answer: 3 hp

1750 × 9 = 15,750. Divide by 5250 to get 3 hp.

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

Questions last reviewed: 18 October 2026

Red Seal Electrician Practice needs JavaScript to run. Use its questions for practice. The real pass mark is usually 70%. Check it with your province or territory's apprenticeship office.