Aircraft

Key Topic 68:  Distance Measuring Equipment

3-68K1 What is the frequency range of the Distance Measuring Equipment (DME) used to indicate an aircraft’s slant range distance to a selected ground-based navigation station?

A. 108.00 MHz to 117.95 MHz.

B. 108.10 MHz to 111.95 MHz.

C. 962 MHz to 1213 MHz.

D. 329.15 MHz to 335.00 MHz.

C. 962 MHz to 1213 MHz.

Aircraft

Key Topic 68: Distance Measuring Equipment

3-68K2 The Distance Measuring Equipment (DME) measures the distance from the aircraft to the DME ground station. This is referred to as:

A. DME bearing.

B. The slant range.

C. Glide Slope angle of approach.

D. Localizer course width.

B. The slant range.

Aircraft

Key Topic 68: Distance Measuring Equipment

3-68K3 The Distance Measuring Equipment (DME) ground station has a built-in delay between reception of an interrogation and transmission of the reply to allow:

A. Someone to answer the call.

B. The VOR to make a mechanical hook-up.

C. Operation at close range.

D. Clear other traffic for a reply.

C. Operation at close range.

Aircraft

Key Topic 68: Distance Measuring Equipment

3-68K4 What is the main underlying operating principle of an aircraft’s Distance Measuring Equipment (DME)?

A. A measurable amount of time is required to send and receive a radio signal through the Earth’s atmosphere.

B. The difference between the peak values of two DC voltages may be used to determine an aircraft’s distance to another aircraft.

C. A measurable frequency compression of an AC signal may be used to determine an aircraft’s altitude above the earth.

D. A phase inversion between two AC voltages may be used to determine an aircraft’s distance to the exit ramp of an airport’s runway.

Aircraft

Key Topic 68: Distance Measuring Equipment

3-68K5 What radio navigation aid determines the distance from an aircraft to a selected VORTAC station by measuring the length of time the radio signal takes to travel to and from the station?

A. RADAR.

B. Loran C.

C. Distance Marking (DM).

D. Distance Measuring Equipment (DME).

Aircraft

Key Topic 68: Distance Measuring Equipment

3-68K6 The majority of airborne Distance Measuring Equipment systems automatically tune their transmitter and receiver frequencies to the paired __ / __ channel.

A. VOR/marker beacon.

B. VOR/LOC.

C. Marker beacon/glideslope.

D. LOC/glideslope.

B. VOR/LOC.

Aircraft

Key Topic 69:  VHF Omnidirectional Range (VOR)

3-69K1 All directions associated with a VOR station are related to:

A. Magnetic north.

B. North pole.

C. North star.

D. None of these.

A. Magnetic north.

Aircraft

Key Topic 69: VHF Omnidirectional Range (VOR)

3-69K2 The rate that the transmitted VOR variable signal rotates is equivalent to how many revolutions per second?

A. 60

B. 30

C. 2400

D. 1800

B. 30

Aircraft

Key Topic 69: VHF Omnidirectional Range (VOR)

3-69K3 What is the frequency range of the ground-based Very-high-frequency Omnidirectional Range (VOR) stations used for aircraft navigation?

A. 108.00 kHz to 117.95 kHz.

B. 329.15 MHz to 335.00 MHz.

C. 329.15 kHz to 335.00 kHz.

D. 108.00 MHz to 117.95 MHz.

Aircraft

Key Topic 69: VHF Omnidirectional Range (VOR)

3-69K4 Lines drawn from the VOR station in a particular magnetic direction are:

A. Radials.

B. Quadrants.

C. Bearings.

D. Headings.

A. Radials.

Aircraft

Key Topic 69: VHF Omnidirectional Range (VOR)

3-69K5  The amplitude modulated variable phase signal and the frequency modulated reference phase signal of a Very-high-frequency Omnidirectional Range (VOR) station used for aircraft navigation are synchronized so that both signals are in phase with each other at ____________ of the VOR station.

A.   180 degrees South, true bearing position.

B.   360 degrees North, magnetic bearing position.

C.   180 degrees South, magnetic bearing position.

D.   0 degrees North, true bearing position.

B.   360 degrees North, magnetic bearing position.

Aircraft

Key Topic 69: VHF Omnidirectional Range (VOR)

3-69K6 What is the main underlying operating principle of the Very-high-frequency Omnidirectional Range (VOR) aircraft navigational system?

A. A definite amount of time is required to send and receive a radio signal.

B. The difference between the peak values of two DC voltages may be used to determine an aircraft’s altitude above a selected VOR station.

C. A phase difference between two AC voltages may be used to determine an aircraft’s azimuth position in relation to a selected VOR station.

D. A phase difference between two AC voltages may be used to determine an aircraft’s distance from a selected VOR station.

Aircraft

Key Topic 70:  Instrument Landing System (ILS)

3-70K1 What is the frequency range of the localizer beam system used by aircraft to find the centerline of a runway during an Instrument Landing System (ILS) approach to an airport?

A. 108.10 kHz to 111.95 kHz.

B. 329.15 MHz to 335.00 MHz.

C. 329.15 kHz to 335.00 kHz.

D. 108.10 MHz to 111.95 MHz.

Aircraft

Key Topic 70: Instrument Landing System (ILS)

3-70K2 What is the frequency range of the marker beacon system used to indicate an aircraft's position during an Instrument Landing System (ILS) approach to an airport's runway?

A. The outer, middle, and inner marker beacons’ UHF frequencies are unique for each ILS equipped airport to provide unambiguous frequency-protected reception areas in the 329.15 to 335.00 MHz range.

B. The outer marker beacon’s carrier frequency is 400 MHz, the middle marker beacon’s carrier frequency is 1300 MHz, and the inner marker beacon’s carrier frequency is 3000 MHz.

C. The outer, the middle, and the inner marker beacon’s carrier frequencies are all 75 MHz but the marker beacons are 95% tone-modulated at 400 Hz (outer), 1300 Hz (middle), and 3000 Hz (inner).

D. The outer, marker beacon’s carrier frequency is 3000 kHz, the middle marker beacon’s carrier frequency is 1300 kHz, and the inner marker beacon’s carrier frequency is 400 kHz.

Aircraft

Key Topic 70: Instrument Landing System (ILS)

3-70K3 Which of the following is a required component of an Instrument Landing System (ILS)?

A. Altimeter: shows aircraft height above sea-level.

B. Localizer: shows aircraft deviation horizontally from center of runway.

C. VHF Communications: provide communications to aircraft.

D. Distance Measuring Equipment: shows aircraft distance to VORTAC station.

Aircraft

Key Topic 70: Instrument Landing System (ILS)

3-70K4 What type of antenna is used in an aircraft’s Instrument Landing System (ILS) glideslope installation?

A. A vertically polarized antenna that radiates an omnidirectional antenna pattern.

B. A balanced loop reception antenna.

C. A folded dipole reception antenna.

D. An electronically steerable phased-array antenna that radiates a directional antenna pattern.

C. A folded dipole reception antenna.

Aircraft

Key Topic 70: Instrument Landing System (ILS)

3-70K5 Choose the only correct statement about the localizer beam system used by aircraft to find the centerline of a runway during an Instrument Landing System (ILS) approach to an airport. The localizer beam system:

A. Operates within the assigned frequency range of 108.10 to 111.95 GHz.

B. Produces two amplitude modulated antenna patterns; one pattern above and one pattern below the normal 2.5 degree approach glide path of the aircraft.

C. Frequencies are automatically tuned-in when the proper glide slope frequency is selected on the aircraft’s Navigation and Communication (NAV/COMM) transceiver.

D. Produces two amplitude modulated antenna patterns; one pattern with an audio frequency of 90 Hz and one pattern with an audio frequency of 150 Hz, one left of the runway centerline and one right of the runway centerline.

Aircraft

Key Topic 70: Instrument Landing System (ILS)

3-70K6 On runway approach, an ILS Localizer shows:

A. Deviation left or right of runway center line.

B. Deviation up and down from ground speed.

C. Deviation percentage from authorized ground speed.

D. Wind speed along runway.

A. Deviation left or right of runway center line.

Aircraft

Key Topic 71:  Automatic Direction Finding Equipment (ADF) & Transponders

3-71K1 What is the frequency range of an aircraft’s Automatic Direction Finding (ADF) equipment?

A. 190 kHz to 1750 kHz.

B. 190 MHz to 1750 MHz.

C. 108.10 MHz to 111.95 MHz.

D. 108.00 MHz to 117.95 MHz.

A. 190 kHz to 1750 kHz.

Aircraft

Key Topic 71: Automatic Direction Finding Equipment (ADF) & Transponders

3-71K2 What is meant by the term “night effect” when using an aircraft’s Automatic Direction Finding (ADF) equipment? Night effect refers to the fact that:

A. All Non Directional Beacon (NDB) transmitters are turned-off at dusk and turned-on at dawn.

B. Non Directional Beacon (NDB) transmissions can bounce-off the Earth’s ionosphere at night and be received at almost any direction.

C. An aircraft’s ADF transmissions will be slowed at night due to the increased density of the Earth’s atmosphere after sunset.

D. An aircraft’s ADF antennas usually collect dew moisture after sunset which decreases their effective reception distance from an NDB transmitter.

Aircraft

Key Topic 71: Automatic Direction Finding Equipment (ADF) & Transponders

3-71K3 What are the transmit and receive frequencies of an aircraft’s mode C transponder operating in the Air Traffic Control RADAR Beacon System (ATCRBS)?

A. Transmit at 1090 MHz, and receive at 1030 MHz

B. Transmit at 1030 kHz, and receive at 1090 kHz

C. Transmit at 1090 kHz, and receive at 1030 kHz

D. Transmit at 1030 MHz, and receive at 1090 MHz

A. Transmit at 1090 MHz, and receive at 1030 MHz

Aircraft

Key Topic 71: Automatic Direction Finding Equipment (ADF) & Transponders

3-71K4 In addition to duplicating the functions of a mode C transponder, an aircraft’s mode S transponder can also provide:

A. Primary RADAR surveillance capabilities.

B. Long range lightning detection.

C. Mid-Air collision avoidance capabilities.

D. Backup VHF voice communication abilities.

C. Mid-Air collision avoidance capabilities.

Aircraft

Key Topic 71: Automatic Direction Finding Equipment (ADF) & Transponders

3-71K5 What type of encoding is used in an aircraft’s mode C transponder transmission to a ground station of the Air Traffic Control RADAR Beacon System (ATCRBS)?

A. Differential phase shift keying.

B. Pulse position modulation.

C. Doppler effect compressional encryption.

D. Amplitude modulation at 95%.

B. Pulse position modulation.

Aircraft

Key Topic 71: Automatic Direction Finding Equipment (ADF) & Transponders

3-71K6 Choose the only correct statement about an aircraft’s Automatic Direction Finding (ADF) equipment.

A. An aircraft’s ADF transmission exhibits primarily a line-of-sight range to the ground-based target station and will not follow the curvature of the Earth.

B. Only a single omnidirectional sense antenna is required to receive an NDB transmission and process the signal to calculate the aircraft’s bearing to the selected ground station.

C. All frequencies in the ADF’s operating range except the commercial standard broadcast stations (550 to 1660 kHz) can be utilized as a navigational Non Directional Beacon (NDB) signal.

D. An aircraft’s ADF antennas can receive transmissions that are over the Earth’s horizon (sometimes several hundred miles away) since these signals will follow the curvature of the Earth.

Aircraft

Key Topic 72:  Aircraft Antenna Systems and Frequencies

3-72K1 What type of antenna pattern is radiated from a ground station phased-array directional antenna when transmitting the PPM pulses in a Mode S interrogation signal of an aircraft’s Traffic alert and Collision Avoidance System (TCAS) installation?

A. 1090 MHz directional pattern.

B. 1030 MHz omnidirectional pattern.

C. 1090 MHz omnidirectional pattern.

D. 1030 MHz directional pattern.

Aircraft

Key Topic 72: Aircraft Antenna Systems and Frequencies

3-72K2 What type of antenna is used in an aircraft’s Instrument Landing System (ILS) marker beacon installation?

A. An electronically steerable phased-array antenna that radiates a directional antenna pattern.

B. A folded dipole reception antenna.

C. A balanced loop reception antenna.

D. A horizontally polarized antenna that radiates an omnidirectional antenna pattern.

C. A balanced loop reception antenna.

Aircraft

Key Topic 72: Aircraft Antenna Systems and Frequencies

3-72K3 What is the frequency range of an aircraft’s Very High Frequency (VHF) communications?

A. 118.000 MHz to 136.975 MHz (worldwide up to 151.975 MHz).

B. 108.00 MHz to 117.95 MHz.

C. 329.15 MHz to 335.00 MHz.

D. 2.000 MHz to 29.999 MHz.

A. 118.000 MHz to 136.975 MHz (worldwide up to 151.975 MHz).

Aircraft

Key Topic 72: Aircraft Antenna Systems and Frequencies

3-72K4 Aircraft Emergency Locator Transmitters (ELT) operate on what frequencies?

A. 121.5 MHz.

B. 243 MHz.

C. 121.5 and 243 MHz.

D. 121.5, 243 and 406 MHz.

Aircraft

Key Topic 72: Aircraft Antenna Systems and Frequencies

3-72K5 What is the frequency range of an aircraft’s radio altimeter?

A. 962 MHz to 1213 MHz.

B. 329.15 MHz to 335.00 MHz.

C. 4250 MHz to 4350 MHz.

D. 108.00 MHz to 117.95 MHz.

C. 4250 MHz to 4350 MHz.

Aircraft

Key Topic 72: Aircraft Antenna Systems and Frequencies

3-72K6 What type of antenna is attached to an aircraft’s Mode C transponder installation and used to receive 1030 MHz interrogation signals from the Air Traffic Control Radar Beacon System (ATCRBS)?

A. An electronically steerable phased-array directional antenna.

B. An L-band monopole blade-type omnidirectional antenna.

C. A folded dipole reception antenna.

D. An internally mounted, mechanically rotatable loop antenna.

B. An L-band monopole blade-type omnidirectional antenna.

Aircraft

Key Topic 73:  Equipment Functions

3-73K1 Some aircraft and avionics equipment operates with a prime power line frequency of 400 Hz. What is the principle advantage of a higher line frequency?

A. 400 Hz power supplies draw less current than 60 Hz supplies allowing more current available for other systems on the aircraft.

B. A 400 Hz power supply generates less heat and operates much more efficiently than a 60 Hz power supply.

C. The magnetic devices in a 400 Hz power supply such as transformers, chokes and filters are smaller and lighter than those used in 60 Hz power supplies.

D. 400 Hz power supplies are much less expensive to produce than power supplies with lower line frequencies.

Aircraft

Key Topic 73: Equipment Functions

3-73K2 Aviation services use predominantly ____ microphones.

A. Dynamic

B. Carbon

C. Condenser

D. Piezoelectric crystal

A. Dynamic

Aircraft

Key Topic 73: Equipment Functions

3-73K3 Typical airborne HF transmitters usually provide a nominal RF power output to the antenna of ____ watts, compared with ____ watts RF output from a typical VHF transmitter.

A. 10, 50

B. 50, 10

C. 20, 100

D. 100, 20

Aircraft

Key Topic 73: Equipment Functions

3-73K4 Before ground testing an aircraft RADAR, the operator should:

A. Ensure that the area in front of the antenna is clear of other maintenance personnel to avoid radiation hazards.

B. Be sure the receiver has been properly shielded and grounded.

C. First test the transmitter connected to a matched load.

D. Measure power supply voltages to prevent circuit damage.

Aircraft

Key Topic 73: Equipment Functions

3-73K5 What type of antenna is used in an aircraft’s Very High Frequency Omnidirectional Range (VOR) and Localizer (LOC) installations?

A. Vertically polarized antenna that radiates an omnidirectional antenna pattern.

B. Horizontally polarized omnidirection reception antenna.

C. Balanced loop transmission antenna.

D. Folded dipole reception antenna.

B. Horizontally polarized omnidirection reception antenna.

Aircraft

Key Topic 73: Equipment Functions

3-73K6 What is the function of a commercial aircraft’s SELCAL installation? SELCAL is a type of aircraft communications __________.

A. Device that allows an aircraft’s receiver to be continuously calibrated for signal selectivity.

B. System where a ground-based transmitter can call a selected aircraft or group of aircraft without the flight crew monitoring the ground-station frequency.

C. Transmission that uses sequential logic algorithm encryption to prevent public “eavesdropping” of crucial aircraft flight data.

D. System where an airborne transmitter can selectively calculate the line-of-sight distance to several ground-station receivers.