Explain the working principle of the following dynamometers with suitable sketches, if necessary: (i) Hydraulic Dynamometer. (ii) Eddy Current Dynamometer.
(i) Hydraulic Dynamometer: In principle, hydraulic dynamometer construction is similar to that of a fluid flywheel. Hydraulic dynamometer consists of an impeller or inner rotating member coupled to the output shaft of the engine. The impeller in this dynamometer rotates in a casing filled with a fluid.
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(ii) Eddy Current Dynamometer: Crankshaft connected to rotor when rotor rotates Eddy current are produce in stator due to magnetic flux set up by the passage of field current in electro magnets these Eddy current oppose the rotor motion thus loading the engine.
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