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Module:     Show:
Module 13. Aircraft aerodynamics, structures and systems
The autothrottle controls the aircraft
•  vertically
•  laterally
•  both later ally and vertically

dkasup asking:
•  Please explain

Community comments: 0
Module 2. Physics
When an open pipe is played and a note is heard
•  the lowest frequency of the note is called second harmonic.
•  resonance occurs with standing waves set up inside the pipe.
•  there is a 180 degrees phase change at the open end.

santro asking:
•  please explain.

Community comments: 0
Module 2. Physics
A good refrigerant has
•  high condensing pressure, low evaporating temperature.
•  high condensing pressure, high evaporating temperature.
•  low condensing pressure, low vaporating temperature.

santro asking:
•  will you please explain the reason??

Community comments: 0
Module 13. Aircraft aerodynamics, structures and systems
The length of a resonant antenna dipole is
•  lambda
•  lambda/2
•  lambda/4

sam1969 asking:
•  Q897) The length of a resonant antenna dipole is -lambda/2
Q955) The length of a resonant antenna dipole is -Lambda/4
There can only be one answer? I think - Lambda/4
Any ideas?


Community comments: 0
Module 13. Aircraft aerodynamics, structures and systems
Medium vibration of 4 to 6 times per revolution is experienced on a helicopter. The primary control method is
•  inspect main rotor head and main drive shaft
•  design of engine and gearbox supports
•  inspect loose fixtures and fittings

sam1969 asking:
•  I selected
-Design of engine and gearbox supports
Medium and High frequency Vibrations – Depending on the helicopter the source may be engine and transmission cooling fan and accessories such as air conditioner compressors, or driveline components.
Any ideas?


Community comments: 0
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