Commercial Theory Homework Questions

HW 1, HW 2

Ground effect is indicated by a decrease in upwash, downwash, and wingtip vortices.

True or false

True

Describe L/Dmax

airspeed where you can get maximum amount of lift

The left turning tendency of an airplane caused by P-factor is the result of the:

propeller blade descending on the right, producing more thrust than the ascending blade on the left

Name the four forces that cause left-turning tendencies.

engine torque, p-factor, gyroscopic precession, spiraling slipstream

What causes Adverse Yaw?

increase of induced drag on rising wing tip and decrease of induced drag on lowering wing, effect offset by using pro-turn rudder, aircrafts yaws in opposite direction of roll

An airplane said to be inherently stable will:

require less effort to control

What causes an airplane (except a T-tail) to pitch nosedown when power is reduced and controls are not adjusted?

the downwash on the elevators from the propeller slipstream is reduced an elevator effectiveness is reduced

What adjustment needs to be made to the airspeed in order to increase RATE of turn at a constant bank angle?

airspeed needs to be reduced

What adjustment needs to be made to the airspeed in order to reduce RADIUS of turn at a constant bank angle?

airspeed needs to be reduced

The longitudinal stability of an airplane is determined by: 

location of the CG with respect to the center of pressure

In theory, if the airspeed of an airplane is doubled while in level flight, parasite drag will become

four times greater

At the airspeed represented by point A, in steady flight, the airplane will

have its maximum L/D ratio

At an airspeed represented by point B, in steady flight, the pilot can expect to obtain the airplane's maximum

glide range

What performance is characteristic of flight at maximum lift/drag ratio in a propeller-driven airplane? Maximum

range and maximum distance glide

As airspeed decreases in level flight below that speed for maximum lift/drag ratio, total drag of an airplane

increases because of increased induced drag

Which statement is true relative to changing angle of attack?

an increase in angel of attack will increase drag

The angle of attack of a wing directly controls the

distribution of pressures acting on the wing

In theory, if the angle of attack and other factors remain constant and the airspeed is doubled, the lift produced at the higher speed will be

four times greater than at the lower speed

An airplane leaving ground effect will

experience an increase in induced drag require more thrust

Longitudinal dynamic instability in an
airplane can by identified by:
A. Bank oscillations becoming
progressively steeper
B. Pitch oscillations becoming
progressively steeper
C. Trilatitudinal roll oscillations
becoming progressively steeper

pitch oscillation becoming progressively steeper

A sweptwing airplane with weak static
directional stability and increased
dihedral causes an increase in:
A. Mach tuck tendency
B. Dutch roll tendency
C. Longitudinal stability

dutch roll tendency

Is internal air pressure higher or lower than external?

lower

When using alternate static source, will your
altitude show an altitude higher or lower than the
actual altitude?

higher

In the Northern Hemisphere, a magnetic
compass may initially indicate a turn towards
the east if:
A. It decelerates while on a southerly heading
B. It accelerates while on a southerly heading
C. It turns left from a northerly heading

turns left from a northerly heading

In the Northern Hemisphere, a magnetic
In the Northern Hemisphere, a magnetic compass will normally indicate a turn toward
north if:
A. A right turn is entered from an east heading
B. A left turn is entered from a west heading
C. The aircraft is accelerated while on an east
or west heading

aircraft is accelerated while on an east or west heading

Does using alternate static air cause airspeed and altitude to indicate higher or lower than actual?

higher

white arc airspeed indication

flap operating range

green arc airspeed indication

normal operating range

yellow arc airspeed indications

caution range

red line airspeed indication

vne

beginning of yellow arc airspeed indication

vno

Which instrument is most likely to indicate incorrectly due to precession errors?

heading indicator

Which statement is true about magnetic deviation of a compass? Deviation

varies for different headings of the same aircraft

What is an operational difference between the turn coordinator and the turn-and-slip indicator? The turn coordinator

indicates roll rate, rate of turn, and coordination; the turn-and-slip indicator indicates rate of turn and coordination

An airplane is located at an airport with an elevation of 5,000 feet MSL and a temperature of 90 degrees F. The altimeter is set to airport elevation. Later that night the temperature plummets to 50 degrees F. Unless the altimeter setting is changed, it will read

5200 feet

Calibrated airspeed is best described as indicated airspeed corrected for

installation and instrument error

True airspeed is best described as calibrated airspeed corrected for

altitude and non-standard temperature

Maximum structural cruising speed is the maximum speed at which an airplane can be operated during

normal operations

Which airspeed would a pilot be unable to identify by the color coding of an airspeed indicator?

maneuvering speed

What is an advantage of an electric turn coordinator if the airplane has a vacuum system for other gyroscopic instruments?

it is a backup in case of vacuum system failure

To determine pressure altitude prior to takeoff, the altimeter should be set to

29.92'“ hg and the altimeter indication noted

Which is the correct symbol for the stalling speed or the minimum steady flight speed at which the airplane is controllable?

V(S)

14 CFR Part 1 defines V(LE) as

maximum landing gear extended speed

The vertical line from point D to point G is represented on the airspeed indicator by the maximum speed limit of the

green arc

What could be one result of exceeding critical Mach number?

aircrat control difficulties