Power Measurement using dynamometer

The entire energy or power produced by the engine is absorbed by the friction resistances of the brake in which of the following dynamometers does?
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Which of the following dynamometer belongs to a different type.
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Which of the following is not a characteristic of the Torsional dynamometer.
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What is the primary function of a rope brake dynamometer?
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In a rope brake dynamometer, the brake force is generated by:
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