top                       Q-1.1 Why should a drive isolation transformer be used ahead of a variable speed drive?                   Q-2.2 Why should an energy efficient motor be used with an AC variable frequency PWM drive?                   Q-3.3 When do you use a helical gear versus a worm gear reducer and why?                 Q-4.4 What is the difference between dynamic braking for an AC variable speed drive and dynamic braking for a DC variable speed drive?               Q-5.5 Why do 3VX or AX belts carry more HP than 3V or A belts?                 Q-6.6 How often should roller chain be lubed?                     Q-7.7 When selecting a proximity sensor, how do you choose between an inductive type or capacitive type?               Q-8.8 When is roller chain "worn out" and how do you measure wear?                   Q-9.9 What grease should I use in electrical motors?                 Q-10.10 How can you minimize the size of major drive components such as the motor and its reducer while maximizing output torque capacity?                   Q-11.11 In what gearbox application would it be advantageous to use a synthetic lubricant?                 Q-12.12 How often should chain and sprockets be inspected to increase chain life and reduce costly breakdowns?