PROPELLER

#51. Centrifugal twisting moment?

• AAssists in unfeathering.
• BAlways opposes aerodynamic turning moment.
• CAssists aerodynamic turning moment when in reverse thrust.
• DAssists aerodynamic turning moment when windmilling.

#52. In reverse thrust?

• AAngle of attack is greatest at the blade tips.
• BAngle of attack is greatest at the blade roots.
• CAngle of attack is greatest at the 70% radius point.
• DAngle of attack is zero.

#1. What is the most common reason for increasing the number of blades on a propeller?

• AIncrease aerodynamic efficiency.
• BReduce propeller noise.
• CIncrease power absorption capability.
• DIncrease the effectiveness of the constant speed unit.