Question

Which of the following is the most accurate dynamometer?

(a) Eddy current dynamometer

(b) Prony brake dynamometer

(c) Hydraulic type dynamometer

(d) Swinging field type dynamometer

I had been asked this question in a national level competition.

Question is taken from Measurements and Testing in section Automotive Electronics, Engine Performance Parameter & Testing of Automobile Engines of Automobile Engineering

Answer 1

Correct answer is (d) Swinging field type dynamometer

To explain I would say: Swinging field type dynamometer is the most accurate dynamometer. It consists of an electrical machine which may be run either by motor or generator.