An inertia dynamometer provides load changes without using a dedicated power absorber.

• A. Sometimes
• B. True
• C. False
• D. Not possible

Answer: (B)

An inertia dynamometer creates load from the rotating mass itself. The engine or motor must accelerate or decelerate the flywheel, and that resistance to change in speed acts as the load. The torque required to change the inertia is T = J × α (plus losses), so the engine feels a resistive force without needing any separate power-absorbing device. Energy is stored in the flywheel during acceleration and can be returned or dissipated as needed, rather than being absorbed by a dedicated external absorber. So load changes can be produced purely by the inertia, making the statement true.