問題一覧
1
Which statement concerning heat and/or temperature is true?
Temperature is a measure of the kinetic energy of the molecules of any substance
2
The boiling point of a given liquid varies
Directly with pressure
3
a double acting actuating cylinder in a 3000 psi system has a piston with a surface rea 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
4
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
5
An airplane wing is designed to produce lift resulting from
Positive air pressure below the wing’s surface and negative air pressure above the wing’s surface along with the downward deflection of air.
6
If the volume of a confined gas is doubled (without the addition of more gas), the pressure will (assume the temperature remains constant)
Be reduced to one half its original value
7
If all or a significant part of a stall strip is missing on an airplane wing, a likely result will be.
Asymmetrical lateral control at a near stall angles of attack
8
If the temperature of a confined liquid is held constant and its pressure is tripled, the volume will
Remain the same
9
Which atmospheric conditions will cause the true landing speed of an aircraft to be the greatest?
High temperature with high humidity
10
Which of the following is newton’s first law of motion, generally termed the law of inertia
Everybody persists in its state of rest, or of motion in a straight line, unless acted upon by some force.
11
Which of the following is NOT considered a method of heat transfer?
Diffusion
12
Which will weigh the least?
35 parts of dry air and 65 parts of water vapor
13
Aspect ratio of a wing is defined as the ratio of the
Wingspan to the mean chord
14
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, 5 PSI; atmospheric pressure, 14.7 PSI
15
Which condition is actual amount of water vapor in a mixture of air and water?
Absolute humidity
16
In physics, which of the following factors are necessary to determine power? 1. Force exerted 2. Distance moved 3. Time required
1,2 and 3
17
The speed of sound in the atmosphere is most affected by variations in which of the following?
Ambient temperature
18
The desire effect of using winglets on an aircraft’s wingtips is to
Increase the lift to drag ratio
19
If the fluid pressure is 800 psi in a ½ inch line supplying an actuating cylinder with a piston area of 10 square inches, the force exerted on the piston will be
8000 pounds
20
Temperature is a measure of the potential If both the volume and the absolute temperature of a confined gas are doubled, the pressure will
Not change
21
The purpose of stall strips on airplane wings is to
Ensure that the wing root areas stall first
22
A wing with very high aspect ratio (in comparison with low aspect ratio wing) will have.
A low stall speed
23
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
24
What force must be applied to roll a 120 pound barrel up an inclined plane 9 feet long to a height of 3 feet (disregard friction)? L ÷ I = R ÷ E L = length of ramp, measured along the slope I = height of ramp R = weight of object to be raised or lowered. E = Force required to raise or lower object
40 pounds
25
The temperature to which humid air must be cooled at constant pressure to become saturated is called
Dew point
26
What is absolute humidity?
The actual amount of the water vapor in a mixture of air and water.
27
The purpose of aircraft wing dihedral is to
Increase lateral stability
28
The speed of sound in the atmosphere
Changes with a change in temperature
29
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. Constant force of 70 pounds is required to move the loaded hoist. What is the total work input required to move the hoist?
840 foot pounds