A motor drive is an electronic unit designed to control the speed of a motor using ___ components.

• A. Inductive
• B. Resistive
• C. Solid-state
• D. Capacitive

Answer: (C)

A motor drive controls speed by electronically regulating the energy fed to the motor, using solid-state power electronics to switch and modulate voltage and (for AC motors) frequency. Solid-state components such as thyristors, IGBTs, MOSFETs, and other semiconductor switches allow rapid, controlled on/off actions and enable techniques like pulse-width modulation to adjust motor speed precisely without mechanical steps. Inductive, resistive, and capacitive describe passive elements that affect current and voltage in a circuit, but they’re not the active control means in a motor drive. That’s why solid-state components are the correct choice.