Physics

Question 1

Which condition is the actual amount of water vapor in a mixture of air and water?

Answer 1

Absolute humidity

Question 2

The purpose of aircraft wing dihedral is to

Answer 2

Increase lateral stability

Question 3

If the fluid pressure is 800 PSI in a 1/2 inch line supplying an actuating cylinder with a piston area of 10 square inches, the force exerted on the piston will be

Answer 3

8,000 pounds

Question 4

Which will weigh the least?

Answer 4

35 parts of dry air and 65 parts of water vapor

Question 5

If the volume of a confined gas is doubled (without the addition of more gas), the pressure will (assume the temperature remains constant)

Answer 5

Be reduced to one half its original value

Question 6

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?

Answer 6

360 foot pounds

Question 7

An airplane wing is designed to produce lift resulting from

Answer 7

Positive air pressure below the wing’s surface and negative air pressure above the wing’s surface along with the downward deflection of air.

Question 8

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)?

Answer 8

Unmetered pressure, 17 PSI; metered pressure, 5 PSI; atmospheric pressure, 14.7 PSI

Question 9

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?

Answer 9

Relative humidity

Question 10

In physics, which of the following factors are necessary to determine power?

1) Force exerted
2) Distance moved
3) Time required

Answer 10

1,2, and 3

Question 11

The main rotor system on a helicopter is classified in three groups. Which of these listed is NOT one of these groups?

Answer 11

The flexible-beam rotor system

Question 12

Which of the following statements are correct?

Answer 12

When the collective pitch control lever is raised, the blade angle of all the rotor blades increase uniformly and they create the lift that allows the helicopter to take off vertically

Question 13

(Refer to Figure 61.) The amount of force applied to rope A to lift the weight is

Answer 13

15 pounds

Question 14

The speed of sound in the atmosphere

Answer 14

Changes with a change in temperature

Question 15

Which of he following is NOT considered a method of heat transfer?

Answer 15

Diffusion

Question 16

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

Answer 16

40 pounds

Question 17

If the temperature of a confined liquid is held constant and its pressure is tripled, the volume will

Answer 17

Remain the same

Question 18

The desired effect of using winglets on an aircraft’s wingtips is to

Answer 18

Increase the lift to drag ratio

Question 19

The boiling point of a given liquid varies

Answer 19

Directly with pressure

Question 20

If all, or a significant part of a stall strip is missing on an airplane wing, a likely result will be

Answer 20

Asymmetrical lateral control at or near stall angles of attack.

Question 21

A wing with a very high aspect ratio (in comparison with a low aspect ratio wing) will have

Answer 21

A low stall speed

Question 22

The purpose of stall strips on airplane wings is to

Answer 22

Ensure that the wing root areas stall first

Question 23

Which atmospheric conditions will cause the true landing speed of an aircraft to be the greatest?

Answer 23

High temperature with high humidity

Question 24

If both the volume and the absolute temperature of a confined gas are doubled, the pressure will

Answer 24

Not change

Question 25

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 required to move the loaded hoist. What is the total work input required to move the hoist?

Answer 25

840 foot pounds

Question 26

The temperature to which humid air must be called at constant pressure to become saturated is called

Answer 26

Dewpoint

Question 27

Which statement concerning heat and/or temperature is true?

Answer 27

Temperature is a measure of the kinetic energy of the molecules of any substance

Question 28

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 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?

Answer 28

6,000 pounds

Question 29

What is absolute humidity

Answer 29

The actual amount of the water vapor in a mixture of air and water

Question 30

The speed of sound in the atmosphere is most affected by variations in which of the following?

1) Sound frequency (CPS)
2) Ambient temperature
3) Barometric pressure

Answer 30

2

Question 31

Aspect ratio of a wing is defined as the ratio of the

Answer 31

Wing span to te main chord

Question 32

Which of the following is Newton’s first law of motion generally termed the law of inertia?

Answer 32

Every body persists in its state of rest, or of motion in a straight line , unless acted upon by some outside force.