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Question 1: What does the following picture show?

  Postage stamp, USA, 1923.
  Sketch of hand-cranked vertical and horizontal screws used in Bushnell's Turtle, 1775
  Propellers of the Titanic: 2 triple-blade and 1 quadruple-blade at center

Question 2: Increasing the number of blades also decreases the amount of work each blade is required to perform, limiting the local ________ - a significant performance limit on propellers.
Reynolds numberMach numberFluid dynamicsKnudsen number

Question 3: What does the following picture show?

  Voith-Schneider propeller
  A controllable pitch propeller
  A World War I wooden aircraft propeller on a workbench.
  Ship propeller from 1843. Designed by C F Wahlgren based on one of John Ericsson propellers. It was fitted to the steam ship s/s Flygfisken built at the Motala dockyard.

Question 4: ________ of Scotland is generally credited with applying the first screw propeller to an engine, an early steam engine, beginning the use of an hydrodynamic screw for propulsion.
Isaac NewtonWilliam Thomson, 1st Baron KelvinJames WattMichael Faraday

Question 5: Contra-rotation also increases power without increasing propeller diameter and provides a counter to the torque effect of high-power piston engine as well as the ________ precession effects, and of the slipstream swirl.
Flight dynamicsGyro monorailGyroscopeAngular momentum

Question 6: What does the following picture show?

  A World War I wooden aircraft propeller on a workbench.
  Postage stamp, USA, 1923.
  A World War I wooden aircraft propeller on a workbench.
  Sketch of hand-cranked vertical and horizontal screws used in Bushnell's Turtle, 1775

Question 7: What does the following picture show?

  A controllable pitch propeller
  Rotating the Hamilton Standard 54H60 propeller on a US Navy EP-3E Orion's number four engine as part of pre-flight checks
  A World War I wooden aircraft propeller on a workbench.
  Postage stamp, USA, 1923.

Question 8: What does the following picture show?

  A propeller from the Lusitania
  A failed rubber bush in an outboard's propeller
  Ship propeller from 1843. Designed by C F Wahlgren based on one of John Ericsson propellers. It was fitted to the steam ship s/s Flygfisken built at the Motala dockyard.
  Propellers of the Titanic: 2 triple-blade and 1 quadruple-blade at center

Question 9: An alternative design is the controllable pitch propeller (CPP), where the blades are rotated normal to the drive shaft by additional machinery - usually ________ - at the hub and control linkages running down the shaft.
Al-JazariIslamic Golden AgeHydraulicsMuslim Agricultural Revolution

Question 10: The propeller is usually attached to the ________ of the engine, either directly or through a gearbox.
Oil pump (internal combustion engine)Two-stroke engineCrankshaftConnecting rod
















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