CAAS SAR-66 Module 14 Propulsion Practice Questions - CAAS SAR-66 Module 14 Propulsion (Category B2 Avionics) Exam

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The propulsive efficiency (eta_p) of a jet engine is expressed by which of the following mathematical relations, where Va is aircraft speed and Vj is jet velocity?

eta_p = (Vj - Va) / (Vj + Va) eta_p = 2 * Va / (Vj + Va) eta_p = Va^2 / Vj^2 eta_p = (Vj + Va) / (2 * Va)

Correct Answer:

eta_p = 2 * Va / (Vj + Va)

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