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Quiz 3 Flashcards

1
Q

What is the definition of the Angle-of-Attack (AOA) of a wing?

A

The angle between the chord line and the relative wind.

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2
Q

An airplane wing is designed to produce lift resulting from:

A

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

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3
Q

The purpose of stall strips on aircraft wings is to:

A

Ensure that the wing root areas stall first.

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4
Q

Which of the following is Newton’s First Law of Motion, generally termed the Law of Inertia?

A

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

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5
Q

The purpose of aircraft wing dihedral is to:

A

Increase lateral stability.

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6
Q

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

A

Wingspan to the mean chord.

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7
Q

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

A

Low stall speed.

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8
Q

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

A

Increase the lift to drag ratio.

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9
Q

Nickel-Cadmium (NiCd or "Nicad") battery cases and drain surfaces which have been affected by electrolyte should be neutralized with a solution of:

A

Boric acid.

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10
Q

In rectangular coordinates, what is the impedance (Z) of a network composed of a 0.1 microhenry inductor in series with a 30Ω resistor operating at 5 MHz?

A

30, +j3.

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11
Q

In rectangular coordinates, what is the impedance of a network composed of a 0.001 microfarad capacitor in series with a 400Ω resistor operating at 500 kHz?

A

400, -j318.

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12
Q

In rectangular coordinates, what is the impedance of a network composed of a 10 microhenry inductor in series with a 40Ω resistor operating at 500 MHz?

A

40, +j31400.

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13
Q

In rectangular coordinates, what is the impedance of a network composed of a 0.1 microhenry inductor in series with a 20Ω resistor operating at 30 MHz?

A

20, +j19.

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14
Q

In rectangular coordinates, what is the impedance of a network composed of a 1.0 millihenry inductor in series with a 200Ω resistor operating at 30 kHz?

A

200, +j188.

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15
Q

In rectangular coordinates, what is the impedance of a network composed of a 0.01 microfarad capacitor in parallel with a 300Ω resistor operating at 50 kHz?

A

159, -j150.

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16
Q

What is the maximum DC or RMS voltage that may be connected across a 20 watt, 2 kΩ resistor?

A

200V.

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17
Q

What is the Peak-to-Peak RF voltage on the 50Ω output of a 100-watt transmitter?

A

200V.

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18
Q

What is the maximum rated current-carrying capacity of a 2kΩ, 200W resistor?

A

0.316A.

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19
Q

A 500Ω resistor rated at 2W and a 1.5kΩ resistor rated at 1W are connected in parallel. What is the maximum voltage that can be applied across the parallel circuit without exceeding wattage ratings?

A

31.6V.

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20
Q

What is the meaning of the term "one time constant of an RC circuit?" The time required to charge the capacitor in the circuit to:

A

63.2% of the supply voltage.

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21
Q

After two (2) time constants, the capacitor in an RC circuit is charged to what percentage of the supply voltage?

A

86.5%.

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22
Q

What is the meaning of the term "one time constant of an RL circuit?" The time required for the:

A

Current in the circuit to build up to 63.2% of the maximum value.

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23
Q

After two (2) time constants, the capacitor in an RC circuit is discharged to what percentage of the starting voltage?

A

13.5%.

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24
Q

What is the term for the time required for the capacitor in an RC circuit to be charged to 63.2% of the supply voltage?

A

One time-constant.

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25
What is the most the actual transmitter frequency could differ from a reading of 156,520,000 Hertz on a frequency counter with a time-base accuracy of +/- 10 ppm (parts per million)?
1565.20 Hz.
26
What is the term for the time required for the capacitor in an RC circuit to charge to 63.2% of the supply voltage?
One time constant.
27
What is the most the actual transmitter frequency could differ from a reading of 462,100,000 Hertz on a frequency counter with a time base accuracy of +/- 1.0 ppm?
462.1 Hz.
28
What is the second harmonic of 380 kHz?
760 kHz.
29
What is the second harmonic of Single Side Band (SSB) frequency 4146 kHz?
8292 kHz.
30
What is the most the actual transmitter frequency could differ from a reading of 462,100,000 Hertz on a frequency counter with a time base accuracy of +/- 0.1 ppm?
46.21 Hz.
31
What is the most the actual transmitter frequency could differ from a reading of 156,520,000 Hertz on a frequency counter with a time base accuracy of +/- 1.0 ppm?
156.52 Hz.
32
Given a power supply with a full load voltage of 200V and a regulation of 25%, what is the no-load voltage?
250V.
33
What is the magnitude of impedance (Z) of a series AC circuit having 6Ω of resistance (R), 17Ω of inductive reactance (XL), and zero capacitive reactance (XC)?
18Ω.
34
What turns ratio does a transformer need in order to match a source impedance of 500Ω to a load of 10Ω?
7.1 to 1 (7.1 : 1).
35
A 1-watt, 10V Zener diode with Imin = 5mA, Imax = 95mA, and Z = 8Ω is used as part of a voltage regulator in a 20V power supply. Approximately what size (value) current-limiting resistor would be used to set its bias to the midpoint of its operating range?
222Ω.
36
What is the percentage of regulation for a power supply with a \"No-Load\" voltage of 12V and a \"Full-Load\" voltage of 10V?
0.2
37
What is the Conductance (G) of a circuit if 6A of current flows when 12VDC is applied?
0.50 Siemens.
38
746 watts, corresponding to the lifting of 550 pounds at a rate of one foot per second, is the equivalent of how many horsepower?
1 Horse power.
39
What does the power factor equal in an RL circuit having a 45-degree phase angle between the voltage and current?
0.707.
40
What is the power factor in an RL circuit having a 30-degree phase angle between the voltage and the current?
0.866.
41
In a circuit where the AC voltage and current are out of phase, how can true power be determined?
Multiply apparent power (VA) times the power factor (PF).
42
If a resistance to which a constant voltage is applied is cut in half, what power dissipation will result?
Double.
43
What is the power factor in an RL circuit having a 60-degree phase angle between the voltage and the current?
0.5.
44
What value series resistor is needed to obtain full scale deflection on a 50 µA DC meter with 200 VDC applied?
4 MΩ.
45
Which of the following Ohms Law formulas is incorrect?
I = R/E.
46
If 2A flows through a 50Ω resistor, what is the voltage (drop) across the resistor?
100V.
47
If a 100Ω resistor is connected across 200V, what is the current through the resistor?
2A.
48
If 3A flows through a resistor connected to 90V, what is the resistance?
30Ω.
49
A relay coil has 500Ω resistance and operates on 125mA. What value resistor should be connected in series with it to operate from a 110 VDC source?
380Ω.
50
What is the time constant of a series circuit with a 100µF capacitor and a 470kΩ resistor?
47 seconds.
51
What is the time constant of a series circuit with two 100µF capacitors and two 470kΩ resistors?
47 seconds.
52
What is the time constant of a parallel circuit with a 220µF capacitor and a 1MΩ resistor?
220 seconds.
53
What is the time constant of a series circuit with two 220µF capacitors and two 1MΩ resistors?
220 seconds.
54
What is the time constant of a parallel circuit with two 220µF capacitors and two 1MΩ resistors?
220 seconds.
55
What is the time constant of a parallel circuit having two 100µF capacitors and two 470kΩ resistors?
47 seconds.
56
What is the impedance (Z) of a parallel network comprised of a 400Ω-reactance inductor and a 300Ω resistor expressed in polar coordinates?
240Ω, 36.9 degrees.
57
Expressed in polar coordinates, what is the impedance of a parallel network composed of a 100pF capacitor and a 4kΩ resistor operating at 500kHz?
2490Ω, -51.5 degrees.
58
Using polar coordinates, what is the impedance of a series circuit composed of a 300Ω-reactance capacitor, a 600Ω-reactance inductor, and a 400Ω resistor?
500Ω, 37 degrees.
59
Using polar coordinates, what is the impedance of a series circuit composed of a 400Ω-reactance capacitor and a 300Ω resistor?
500Ω, -53.1 degrees.
60
Using polar coordinates, what is the impedance of a series circuit composed of a 100Ω-reactance inductor and a 100Ω resistor?
141Ω, 45 degrees.
61
Using the polar coordinate system, what visual representation do you get of a voltage in a sinewave circuit?
The plot shows the magnitude and phase angle of the voltage.
62
What is the equivalent to the Root-Mean-Square value of an AC voltage?
The DC voltage causing the same heating in a given resistance as the \"RMS\" AC voltage of the same value.
63
What is the RMS value of a 340V peak-to-peak pure sinewave?
120V.
64
At pi/3 (π/3) radians, what is the amplitude of a sinewave having a peak (maximum) value of 5V?
4.3V.
65
At 150o, what is the amplitude of a sinewave having a peak value of 5V?
2.5V.
66
At 240o, what is the amplitude of a sinewave having a peak value of 5V?
-4.3V.
67
Which of the following op-amps is operated open-loop (no \"RF\")?
Comparator.
68
In a negative-logic circuit, what level is used to represent a logic 0 (low)?
High level.
69
In a positive-logic circuit, what level is used to represent a logic 1 (high)?
High level.
70
Choose the most correct statement with respect to component damage from electrostatic discharge.
ESD damage may cause immediate circuit failures but may also cause failures much later at times when the equipment is critically needed.
71
(1) A detail drawing is a description of a single part. (2) An assembly drawing is a description of an object made up of two or more parts. Regarding the above statements:
Both are true.
72
A specific measured distance from the datum (an imaginary vertical reference plane or line chosen by the aircraft manufacturer from which all arms used for weight and balance computation are measured) or some other point identified by the manufacturer, to a point in or on the aircraft is called what?
Station number.
73
Which statement is true regarding an orthographic projection?
One-view, two-view, and three-view drawings are the most common.
74
Which of the following statements is/are true? (1) Schematic diagrams indicate the location of individual components in the aircraft. (2) Schematic diagrams indicate the location of components with respect to each other within the system.
Only #2 is true.
75
In a sectional view drawing, what sections illustrate particular parts of an object?
Removed sections.
76
Working drawings may be divided into what three classes?
Detail, Assembly, & Installation drawings.
77
The depiction/description of a single part is what class of working drawing?
Detail drawing.
78
The \"negative temperature coefficient\" of a thermistor means that as temperature increases, resistance will do what?
Decrease.
79
Using the swamping resistor for thermal stability, what type of feedback is developed to control the amplifier?
Degenerative.
80
Which of the following devices is used to dissipate heat into the air?
Heat sink.
81
What type of amplifier coupling is used that can amplify DC voltages as well as AC signals?
Direct.
82
In a common collector amplifier, degenerative feedback is how many degrees out of phase with the input signal?
180 degrees.
83
The common base amplifier has a voltage gain _____ than one, but a current gain _____ than one.
Greater than one, less than one.
84
What type of waveform is produced by a sinusoidal oscillator?
Sine wave.
85
The basic requirements for sustaining oscillations in an oscillator are a power supply, FDD, amplifier, and _____.
regenerative feedback.
86
If the positive alteration of a square wave is 100 µsec in duration, then the PRF is:
5 kHz.
87
What type of output waveform is produced by an astable multivibrator?
Square wave or rectangular.
88
The astable multivibrator is a:
Free running oscillator.
89
The monostable multivibrator output PRF is determined by the:
Input trigger frequency.
90
With a transistor amplifier operating in class B, the collector current will flow for what percentage/how many degrees of the input signal?
180o.
91
The interchange of energy between the inductor and capacitor in a tank circuit is called what?
the flywheel effect.
92
The amplifier's class of operation is determined by what?
amount of forward bias.
93
What is the resistance of normally closed contacts when the relay is de-energized?
0Ω / short.
94
What distinguishes a solenoid from a basic relay?
The plunger (armature) pulled into the coil.
95
What part of a basic relay returns the armature to its de-energized position?
The spring.
96
How many paths of current are required for a holding relay coil?
Two.
97
What parts of a relay comprise the Primary (Control) Circuit?
Core & Coil.
98
What parts of a relay comprise the Secondary (Controlled) Circuit?
Armature, Contacts, Spring.
99
Aircraft wire is normally rated at what voltage?
115Vac.
100
Transformers are considered what kind of filter?
Band pass.
101
What is the flow of electrons through a conductor called?
Current.
102
What maintenance practice is best for Foreign Object Damage (FOD) prevention?
All of these.
103
Most accidents are caused by what?
All of the above.
104
When should a person stop administering mouth to mouth resuscitation/CPR?
All of the above.
105
Which type of diagram will tell the size of an electrical wire?
Wiring diagram.
106
What does the phrase \"cradle to grave\" refer to?
Hazardous waste management programs.
107
Who is responsible for providing an (M)SDS with chemicals?
Chemical manufacturer.
108
When installing equipment in aircraft, what references do you use?
All of these.
109
Why is stainless steel safety wire used with steel bolts?
Prevent dissimilar metal corrosion.
110
Can you use .032\" safety wire in a .045\" hole?
Yes.
111
What should be removed at preflight?
Both A & B.
112
What happens to wire resistance if the length is increased?
It increases.
113
What happens to wire resistance if the cross-section (area) increases?
decreases.
114
What does it mean if there is no 4th band on a resistor?
+/- 20% tolerance.
115
What is the leading cause of accidents?
Human Error.
116
What must be done to a torque wrench when finished?
Reset to the minimum setting.
117
How do you move elevators?
Move the yoke forward or backward.
118
What does a filter in an electrical circuit consist of?
A capacitor and an inductor.
119
How do you clean corrosion from aluminum?
Emery cloth, aluminum wool.
120
An aircraft in flight; is the pressure on the wing greatest on the top or the bottom?
Bottom.
121
How many ohms is the aircraft radio impedance (a.k.a. Surge Impedance)?
50Ω.
122
What do flip-flops do (when used in Static RAM)?
Store bits of data (1 bit per flip-flop).
123
How many watts is considered an RF danger?
1000 watts.
124
When using a Digital Multimeter (DMM) or Ohmmeter to test a forward biased BJT emitter to base junction, what will the resistance be?
Low.

att 214 (1 decks)

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