Which outcome occurs when helicopter rotor tip speed increases?

💡 Explanation

Compressibility effects arise because exceeding the critical Mach number initiates turbulence, thereby increasing drag. This reduces lift efficiency because shock waves rather than smooth flow develop around the rotor tip, therefore select A rather than option B which is about 'induced drag'.

• Which outcome occurs when a refrigeration system's evaporator coil temperature drops excessively at constant load?
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