Related InterviewSolutions

• Which shape is traced by the trailing vortex at the tip of the airscrew blade?(a) Helix(b) Solenoid(c) Circle(d) Sine curveThis question was addressed to me in unit test.Origin of the question is Blade Element Theory topic in chapter Helicopter Dynamics of Aerodynamics
• Which of these is not the purpose of rotor blade?(a) Generate lift(b) Counter weight(c) Provide thrust(d) Generate dragI got this question in an online interview.The above asked question is from Blades and Propellers topic in portion Helicopter Dynamics of Aerodynamics
• How are the aerodynamic forces of the rotor controlled?(a) Feathering motion(b) Lag motion(c) Flap motion(d) Yaw motionThe question was posed to me in an interview for job.This question is from Helicopter Rotor and Notations topic in section Helicopter Dynamics of Aerodynamics
• What would an efficient vertical flight mean?(a) Low power loading(b) High lift(c) Less drag(d) Less pressure differenceThe question was posed to me during an interview.Enquiry is from Helicopter Rotor and Notations in section Helicopter Dynamics of Aerodynamics
• What is the formula for the helix angle?(a) Φ=tan^-1\(\frac {V_0}{V_E}\)(b) Φ=sin^-1\(\frac {V_0}{V_E}\)(c) Φ=cos^-1\(\frac {V_0}{V_E}\)(d) Φ=tan^-1\(\frac {V_E}{V_0}\)This question was addressed to me during an internship interview.The question is from Blade Element Theory topic in portion Helicopter Dynamics of Aerodynamics
• Why is the flap hinge offset in articulated rotor?(a) Design constraints(b) Mechanical constraints(c) Aerodynamics constraints(d) Vibrational constraintsThe question was asked during an interview for a job.My question is from Blades and Propellers in section Helicopter Dynamics of Aerodynamics
• What is rotor polar?(a) Plot of power coefficient as a function of thrust coefficient(b) Plot of thrust coefficient as a function of power coefficient(c) Plot of power coefficient as a function of lift coefficient(d) Plot of power coefficient as a function of drag coefficientI got this question in homework.Question is taken from Blade Element Theory in chapter Helicopter Dynamics of Aerodynamics
• Why is blade element theory preferred over momentum theory for designing a propeller?(a) Assumes flow inside stream tube as constant(b) Neglects span wise flow(c) Model thrust lag(d) Account for varying blade geometryI had been asked this question in unit test.The above asked question is from Blade Element Theory in portion Helicopter Dynamics of Aerodynamics
• How does the blade element theory treat the airfoil as?(a) One-dimensional(b) Two-dimensional(c) Three-dimensional(d) One complete bodyThe question was asked during an interview for a job.I'd like to ask this question from Blade Element Theory topic in division Helicopter Dynamics of Aerodynamics
• How is induced velocity in far wake region and actuator disk related in climb condition?(a) w=√v(b) w=v^2(c) w=2v(d) w=3vI had been asked this question in semester exam.This interesting question is from Momentum Theory in section Helicopter Dynamics of Aerodynamics