Theory of Flight and Control

THEORY OF FLIGHT AND CONTROL: (1 Mark for each question)

1. One liter of gas is place on a flat table at standard room temperature 37 °C and contains 30 mg of water vapor. What is the absolute humidity of the gas inside the bottle?

1. 0.81 mg/°C
2. 30 mg/L
3. 37 L/mg

1. Since the temperature, pressure and density of the atmosphere varies from place to place and the set of standard conditions is usually known as the International Standard Atmosphere (ISA) or in the aircraft industry this is known as the ICAO Standard. According to ICAO and ISA the ‘standard day’ at  SEA LEVEL is

1. Temperature: 15° C
2. Barometric Pressure: 29.92 mB
3. Humidity: 5 %

1. International Standard Atmosphere (ISA) stated that the atmosphere classified into regions based on the variation of temperature with altitude. Which statement below is true based on application of ISA?

1. Aircraft fly only in the Troposphere and the lowest part of the Stratosphere.
2. Aircraft fly only in the Mesosphere and the lowest part of the Troposphere.
3. Aircraft fly only in the Thermosphere and the lowest part of the Mesosphere

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                                                                                                          Figure 1

1. Figure 1 shows an airfoil shape for NACA 2435. The last two digits which is 35 correspond to the:

1. Maximum thickness of airfoil in percentage of chord
2. Maximum camber in percentage of chord
3. The position of maximum camber in tenths of chord

1. What are the two factors of lift when considering Newton’s Third Law of motion and Bernoulli’s Principle relating to airfoils?

1. Forcing air downwards and speed increased.
2. Pressure differential and velocity increased.
3. Forcing air downwards and pressure differential.

1. Which two types of airfoils have no lift when the angle of attack is zero?

1. A symmetrical airfoil and vortex generator.
2. An asymmetrical airfoil and a flat plate.
3. A symmetrical airfoil and a flat plate.

1. An aircraft is flying at 350 mph into a head wind of 75 mph, what will its ground speed be

1. 175 mph.
2. 275 mph.
3. 200 mph.

1. Boundary layer is depending on the value of Reynold Number. What is the condition of the airflow if the value of Reynold number is highest?

1. Laminar
2. Turbulent
3. Separated

1. Each type of profile drag varies with the speed of the aircraft. The combined effect of all profile drag varies proportionately to the square of aircraft speed. If airspeed is doubled, profile drag increases by a ___________.

1. Factor of two
2. Factor of four
3. Factor of eight

1. What type of drag which created in the boundary layer by the roughness of the aircraft surfaces?

1. Parasite drag
2. Skin friction drag
3. Interference drag

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