Propellers Exam Questions & Answers | Verified

Propellers Exam Questions & Answers | Verified Which of the following is identified as the cambered or curved side of a propeller blade corresponding to the upper surface of a wing airfoil section? A. blade back B. bade chord C. blade face - Answer- A The primary purpose of the propeller is to A. 12-15 degrees B. -8 degrees C. 30 degrees - Answer- C Geometric pitch of a propeller is defined as A. effective pitch minus slippage. B. effective pitch plus slippage. C. angle between the blade chord and the plane of rotation. - Answer- B The actual distance a propeller moves forward through the air during one revolution is known as the A. effective pitch. B. geometric pitch C. slip. - Answer- A Blade angle is an angle formed by a line perpendicular to the crankshaft and a line formed by the A. relative wind. B. chord of the blade. C. blade face. - Answer- B Propeller blade station numbers increase from A. hub to tip. B. tip to hub. C. leading edge to trailing edge. - Answer- A What operational force causes the greatest stress on a propeller? A. aerodynamic twisting force B. centrifugal force C. thrust bending force - Answer- B What operational force causes propeller blade tips to lag in the opposite direction of rotation? A. thrust bending. B. aerodynamic twisting C. torque bending - Answer- C What operational force tends to bend the propeller blades forward at the tips? A. torque bending force B. centrifugal-twisting force C. thrust bending force - Answer- C How does the aerodynamic twisting force affect operating propeller blades? A. It tends to turn the blades to a high blade angle. B. It tends to bend the blades forward C. It tends to turn the blades to a low blade angle - Answer- A The centrifugal twisting force of an operating propeller tends to A. increase the pitch angle. B. reduce the pitch angle. C. bend the blades in the direction of rotation. - Answer- B The angle of attack of a rotating propeller blade is measured between the blade chord or face and which of the following? A. plane of blade rotation B. full low-pitch blade angle C. relative airstream - Answer- C The thrust produced by rotating a propeller is a result of A. An area of low pressure behind the propeller blades. B. an area of decreased pressure immediately in front of the propeller blades. C. the angle of the relative wind and rotational velocity of the propeller. - Answer- B Which of the following best describes the blade movement of a feathering propeller that is in the HIGH RPM position when reversing? A. low pitch directly to reversing B. low pitch through high pitch to reverse pitch C. low pitch through feathering position to reverse pitch - Answer- A What are the rotational speed and blade pitch angle requirements of a constant-speed propeller during takeoff? (Figure 7-3) A. low speed and high pitch angle B. high speed and low pitch angle C. high speed and high pitch angle - Answer- B