Which of the following is Newton’s first law of motion, generally termed the law of intertia?
Objects at rest tend to remain in rest and objects in motion tend to remain in motion at the same speed and in the same direction, unless acted on by and external force.
The main rotor system on a helicopter is classified in three groups. Which of those listed is NOT one of these groups?
The flexible-beam rotor system.
If a double acting actuating cylinder in a 3,000 psi system has a piston with a surface area of three square inches on the extension side, and a rod with a cross-section area of one square inch attached to the piston on the other side, approximately how much force will the actuator be able to produce when retracting?
6,000 pounds
Which is the ratio of the water vapor actually present in the atmosphere to the amount that would be present if the air were saturated at the prevailing temperature and pressure?
Relative humidity
The purpose of aircraft wing dihedral is to?
Increase lateral stability
Which statement concerning heat and/or temperature is true?
Temperature is a measure of the kinetic energy of the molecules of any substance.
(Refer to figure 61) The amount of force applied to rope A to lift the weight is?
15 pounds
The temperature to which humid air must be cooled at constant pressure to become saturated is called?
Dewpoint
Which of the following statements is correct?
(about helicopter pitch control) (middle answer)
When the collective pitch control lever is raised, the blade angle of all the rotor blades increases uniformly and they create the lift that allows the helicopter to take off vertically.
Which will weigh the least?
35 parts of dry air and 65 parts of water vapor
An airplane wing is designed to produce lift resulting from?
Positive air pressure below the wings surface and negative air pressure above the wings surface along with the downward deflection of air.
A wing with a very high aspect ratio (in comparison with a low aspect ratio wing) will have
A low stall speed
Under which conditions will the rate of flow of a liquid through a metering orifice (or jet) be the greatest (all other factors being equal)?
Unmetered pressure, 17 psi
metered pressure, 5psi
atmospheric pressure 14.7 psi
In physics, which of the following factors are necessary to determine power?
Force exerted, distance moved, and time required
If both the volume and the absolute temperature of a confined gas are doubles, the pressure will?
Not change
How much work input is required to lower (not drop) a 120 pound weight from the top of a 3-foot table to the floor?
360 foot pounds
Aspect ratio of a wing is defined as the ratio of the?
Wingspan to the mean chord.
Which atmospheric conditions will cause the true landing speed of an aircraft to be the greatest?
High temperature with high humidity.
An engine that weighs 350 pounds is removed from an aircraft by means of a mobile hoist. The engine is raised 3 feet above its attachment mount, and the entire assembly is then moved forward 12 feet. A constant force of 70 pounds is applied to move the loaded hoist. What is the total work input required to move the hoist?
840
