ATF Practice Test Questions and Correct Answers

ATF Practice Test Questions and Correct Answers When air is forced through a pipe that gradually constricts, the air travels faster in the constricted section. What part of the pipe has more static pressure? - ANSWER The constricted portion has less static pressure than both ends of the pipe. What principal is the change of pressure on top of a wing in flight explained by? - ANSWER Bernoulli's principal In what way does Newtons third law explain how lift can be generated by a wing? - ANSWER Air being deflected downward by a wing causes an opposite reaction Lift is the component of aerodynamic force that acts...? - ANSWER Perpendicular to the relative airflow ( or chord of wing, depends who's writing the test) Drag is the component of aerodynamic force that acts...? - ANSWER Parallel to the relative airflow and in the same direction. What type of drag is not part of parasite drag? - ANSWER Induced drag. What type of drag is caused by the effect of one part on another ? - ANSWER Interference drag What type of drag increases as the speed of an aircraft increases? - ANSWER Parasite drag What force acts vertically toward the centre of the earth and that results from gravity? - ANSWER Weight What is the centre of pressure? - ANSWER The part where all the lift forces can be considered to be acting on the wing. What must be equal for an aircraft to fly straight and level at a constant speed? - ANSWER Thrust and drag must be equal What best determines the performance of an aircraft? - ANSWER Pitch and power What is the angle of attack measured between? - ANSWER The relative airflow and chord line What happens to the centre of pressure as the angle of attack increases and stalls? - ANSWER The CoP moves forward and then rearward during the stall. What way is air deflected after it passes over an airfoil? - ANSWER downwards