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A turboprop is very efficient when operated at cruise speed of __________

a) 200-400 mph
b) 20-40 mph
c) 10-100 mph
d) 600-800 mph

Answer: a
Explanation: Turboprops are extremely efficient when operated at cruise speeds of 200 to 400 mph. This is the ideal cruise speed for such engines, thus providing such efficiency.

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