Chassis dynamometers are very useful for all of the following, except: a. diagnosing suspension concerns.

b. tuning engines.

c. determining output in torque and horsepower.

d. testing vehicle performance.

The answer to this question is given below in the explanation section. Chassis dynamometers are not used for tuning engines of the vehicles.

Explanation:

Chassis dynamometers are used for testing vehicles. It is used for testing the vehicles and it is mechanical devices that are mostly used for measuring power and torque of vehicles such as a car, bike, truck or even an agricultural machine, etc. It can be used not only for determining the output in torque and horsepower measurement but it also used for diagnosing suspension concerns and testing vehicle performance.

The very common usage of chassis dynamometers is emissions and fuel consumption measurement according to some pre-defined testing cycles (specifically at government level), or to determine fuel consumption under load. Technical institutions such as schools and universities use dynamometers for investigations in combustion physics, chemical comparisons of fuel, or just to simulate the road while testing the car for various purposes.

however, It is not used for the tuning engine of any vehicle.