Mechanical power transmission systems are used in combination with which three forms of power?

• A. Electrical, thermal, fluid
• B. Magnetic, chemical, acoustic
• C. Mechanical, optical, biological
• D. Nuclear, gravitational, radiant

Answer: (A)

The main idea here is how mechanical power transmission systems connect with different energy sources to drive machinery. Mechanical power transmission moves energy from a source to a machine, and in practice it usually works alongside three common forms of power: electrical, thermal, and fluid power.

Electrical power is involved when motors convert electrical energy into rotational mechanical energy, which the transmission then uses to deliver the desired speed and torque to the output. Thermal power appears when heat energy is converted into mechanical work, as in engines and turbines; the transmission carries the resulting mechanical power to the driven components. Fluid power uses pressed liquids (hydraulic or pneumatic systems) to create and transmit force; pumps and actuators generate motion, and the mechanical transmission links those movements to the machinery being driven.

Other energy forms listed aren’t the typical trio associated with mechanical power transmission in standard practice, so they don’t fit as the common set described.