# 2a051t CDC Questions: Quiz!

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Quizzes Created: 1 | Total Attempts: 47
Questions: 37 | Attempts: 47

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• 1.

### (001) The angle between true north and the direction indicated by the needle of a compass influenced only by the earth's magnetic field is termed:

• A.

Variation

• B.

Deviation

• C.

Hard Iron Error

• D.

Relative Course

A. Variation
Explanation
Variation refers to the angle between true north and the direction indicated by the needle of a compass, which is influenced solely by the Earth's magnetic field. It is important to understand variation in order to accurately navigate using a compass, as it helps determine the difference between magnetic north and true north.

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• 2.

### (007) In an embedded global positioning system, a Kalman filter is used to model errors in?

• A.

Latitude and longitude

• B.

Velocity and position

• C.

Altitude and attitude

• D.

Pitch and roll

B. Velocity and position
Explanation
In an embedded global positioning system, a Kalman filter is used to model errors in velocity and position. A Kalman filter is a mathematical algorithm that estimates the true state of a system based on noisy measurements. In the case of a GPS system, the Kalman filter is used to estimate the actual velocity and position of the receiver, taking into account errors and uncertainties in the measurements. By continuously updating and refining these estimates, the Kalman filter improves the accuracy and reliability of the GPS system.

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• 3.

### (011) On the communication system, modulation means:

• A.

Varying the amplitude, frequency or phase of the carrier signal

• B.

The carrier signal is not susceptible to jamming

• C.

Keeping the amplitude, frequency or phase of the combined signal

• D.

Combining 2 signals together

A. Varying the amplitude, frequency or phase of the carrier signal
Explanation
Modulation refers to the process of varying one or more properties of a carrier signal, such as amplitude, frequency, or phase, in order to transmit information. This is done by superimposing the information signal onto the carrier signal, which allows for efficient transmission and reception of the signal. By varying these properties, the carrier signal carries the information and can be demodulated at the receiver to retrieve the original signal.

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• 4.

### (206) (ESTS) Which Interconnect Assembly interconnects the AC Power Equipment, RF Equipment, STIM/RESP VXI No.1 and No.2 Assemblies?

• A.

Interconnect Assembly No.1 (A10)

• B.

Interconnect Assembly No.2 (A11)

• C.

Interconnect Assembly No.3 (A12)

• D.

Interconnecting Box (A15)

B. Interconnect Assembly No.2 (A11)
Explanation
The correct answer is Interconnect Assembly No.2 (A11). This interconnect assembly is responsible for connecting the AC Power Equipment, RF Equipment, STIM/RESP VXI No.1, and No.2 Assemblies.

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• 5.

### (224) What is the operational range in the MSU?

• A.

22.5-30 MHz

• B.

21.4 MHz-18.5 GHz

• C.

2.5-18.5 GHz

• D.

None of the above

B. 21.4 MHz-18.5 GHz
Explanation
The operational range in the MSU is 21.4 MHz-18.5 GHz. This means that the MSU can operate within this frequency range, allowing it to effectively communicate and function within this specific frequency range.

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• 6.

### (225) The programmable output range of the variable DC power supply on the optical test bench is?

• A.

0 to+5 VDC; 0.8 amp

• B.

0 to+10 VDC; 1.2 amp

• C.

0 to+18 VDC; 1.6 amp

• D.

0 to+24 VDC; 2.0 amp

C. 0 to+18 VDC; 1.6 amp
Explanation
The programmable output range of the variable DC power supply on the optical test bench is 0 to +18 VDC; 1.6 amp. This means that the power supply can provide a voltage output ranging from 0 to +18 volts, and a current output of 1.6 amps. This range allows for flexibility in powering different devices or components on the optical test bench, ensuring that the appropriate voltage and current levels can be supplied as needed.

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• 7.

### (002) How many aircraft components is the VOR/ILS comprised of?

• A.

4

• B.

3

• C.

6

• D.

5

A. 4
Explanation
The VOR/ILS system is comprised of four aircraft components. The VOR (VHF Omnidirectional Range) provides navigation information by transmitting signals in all directions. The ILS (Instrument Landing System) helps aircraft to land safely by providing precision guidance during approach and landing. Together, these two components form the VOR/ILS system, which is crucial for accurate navigation and landing in aviation.

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• 8.

### (228) How many outputs are provided by the FCU in the power system of the Improved Avionics Intermediate Shop Test Station?

• A.

5

• B.

6

• C.

7

• D.

8

C. 7
Explanation
The FCU in the power system of the Improved Avionics Intermediate Shop Test Station provides 7 outputs.

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• 9.

### (206) What major ESTS assemblies are connected by the Interconnect assembly A11 (SIA2)?

• A.

A1,A4,A6,A8

• B.

A1,A2,A3,A4

• C.

A5,A6,A7,A8

• D.

A2,A3,A6,A7

D. A2,A3,A6,A7
Explanation
The Interconnect assembly A11 (SIA2) connects major ESTS assemblies A2, A3, A6, and A7.

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• 10.

### (228) What does FCU stand for (IAIS)?

• A.

Frequency counter unit

• B.

Frequency changer unit

• C.

Frequency continuator unit

• D.

Frequency controlled unit

B. Frequency changer unit
Explanation
The correct answer is "frequency changer unit." In the context of the International Association of Insurance Supervisors (IAIS), FCU stands for frequency changer unit. This unit is responsible for changing the frequency of a signal, which can be important in various applications such as telecommunications or power systems.

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• 11.

### (424) How many general-purpose interface buses does the C-17 automatic test equipment station have?

• A.

2

• B.

3

• C.

4

• D.

5

B. 3
Explanation
The C-17 automatic test equipment station has three general-purpose interface buses.

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• 12.

### (020) What is the digital teletype data-rate capability of the Single Integrated Operational Plan Terminal?

• A.

75-bits per second (bps)

• B.

300 bps

• C.

33.6-kilobits per second (Kbps)

• D.

56 Kbps

A. 75-bits per second (bps)
Explanation
The digital teletype data-rate capability of the Single Integrated Operational Plan Terminal is 75-bits per second (bps). This means that the terminal is capable of transmitting data at a rate of 75 bits per second.

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• 13.

### (022) What identifies the equipment that transmits the altitude of the airborne identification friend or foe/selective idenification feature (IFF/SIF?

• A.

Encoding scalers

• B.

Decoding scalers

• C.

Altitude digitizer

• D.

Altitude coder

C. Altitude digitizer
Explanation
The equipment that transmits the altitude of the airborne identification friend or foe/selective identification feature (IFF/SIF) is called an altitude digitizer. This device is responsible for converting the altitude information into a digital format that can be transmitted and understood by other systems. It plays a crucial role in accurately identifying and tracking aircraft in the airspace.

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• 14.

### (408) The ATLAS command that performs the same function as the VERIFY command, but without the evaluation field, is?

• A.

• B.

APPLY

• C.

MEASURE

• D.

MONITOR

C. MEASURE
Explanation
The correct answer is MEASURE. The MEASURE command in ATLAS performs the same function as the VERIFY command, but without the evaluation field. This means that it will check the specified condition or criteria without evaluating any specific field or value. The MEASURE command is useful for checking the validity or accuracy of certain aspects of data or processes without the need for a specific field evaluation.

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• 15.

### (404) A mode descriptor of Bus Response in a Fetch statement is :

• A.

Idenifies response acquisition from general buses

• B.

Idenifies response acquisition from the interface bus

• C.

Idenifies response acquisition of self-test subfunction

• D.

Idenifies response acquisition of self-test interface

A. Idenifies response acquisition from general buses
Explanation
The mode descriptor of Bus Response in a Fetch statement identifies the acquisition of response from general buses. This means that the Fetch statement is retrieving the response from the general buses, which are likely used for communication or data transfer within a system.

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• 16.

### (220) On the IAIS test station, which CCA provides biphase stimulus to the UUT?

• A.

Bi-phase CCA

• B.

MLPRF CCA

• C.

SI CCA

• D.

None of the above

C. SI CCA
Explanation
The SI CCA (Signal Interface Common Control Assembly) provides biphase stimulus to the UUT (Unit Under Test) on the IAIS (Integrated Avionics Instrument System) test station. This means that the SI CCA is responsible for generating a biphase signal that is used to stimulate or test the UUT. The other options, bi-phase CCA and MLPRF CCA, do not specifically mention providing biphase stimulus, and "none of the above" is not the correct answer as the SI CCA is indeed the correct option.

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• 17.

### (406) The reference frequency for the radio frequency (RF) module microwave signal conditioner (MSC) and spectrum analyzer is provided by the RF synthesizer

• A.

3A1A4

• B.

3A1A3

• C.

3A1A2

• D.

3A1A1

A. 3A1A4
Explanation
The RF synthesizer provides the reference frequency for the RF module microwave signal conditioner (MSC) and spectrum analyzer. This means that the RF synthesizer generates a stable and precise frequency that is used as a reference for the MSC and spectrum analyzer to perform their functions accurately.

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• 18.

### (402) The Digital DAAE is arranged into FTG's (Functional Test Groups) according to

• A.

Program guidelines

• B.

LRU's that are tested

• C.

Test Station Temperature

• D.

Interface Protocols

B. LRU's that are tested
Explanation
The Digital DAAE is arranged into FTG's according to the LRU's that are tested. This means that the Functional Test Groups are organized based on the specific Line Replaceable Units (LRU's) that are being tested. This allows for efficient testing and troubleshooting of the LRUs, as they are grouped together based on their functionality and testing requirements.

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• 19.

### (428) What component(s) of the computer automated display test set is/are only used to test the C-17's heads-up display line replaceable unit?

• A.

Low-level photopic high-speed Photomultiplier tube

• B.

• C.

Triple-photomultiplier tube assembly and supplementary lens

• D.

Multifunction display holding fixture and supplementary lens

A. Low-level photopic high-speed Photomultiplier tube
Explanation
The low-level photopic high-speed photomultiplier tube is the component of the computer automated display test set that is used to test the C-17's heads-up display line replaceable unit.

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• 20.

### (405) Which assembly provides power for the DC power switch assembly relays on the Radar/Electronic Warfare test station.

• A.

MSC power supply

• B.

SIM general-purpose switching assembly

• C.

RF power strip

• D.

Facility power

B. SIM general-purpose switching assembly
Explanation
The SIM general-purpose switching assembly provides power for the DC power switch assembly relays on the Radar/Electronic Warfare test station.

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• 21.

### (023) What IFF mode permits a special code to e transmitted for aircraft ID?

• A.

Mode 1

• B.

Mode C

• C.

Mode 2

• D.

Mode D

C. Mode 2
Explanation
Mode 2 in IFF (Identification Friend or Foe) permits a special code to be transmitted for aircraft ID.

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• 22.

### (401) How many bays does the digital DAAE have?

• A.

1

• B.

2

• C.

3

• D.

4

B. 2
Explanation
The digital DAAE has 2 bays.

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• 23.

### (221) What is the bandwidth of the ILF measurement CCA?

• A.

1Khz

• B.

1Mhz

• C.

1Mohm

• D.

1Ghz

B. 1Mhz
Explanation
The correct answer is 1Mhz. The question is asking about the bandwidth of the ILF measurement CCA. Bandwidth refers to the range of frequencies that a device or system can handle. In this case, the ILF measurement CCA has a bandwidth of 1Mhz, meaning it can handle frequencies up to 1Mhz.

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• 24.

### (225) In the IAIS OTB systems, what connects between the digital theodolite assy and the test station computer?

• A.

Digital theodolite assembly

• B.

Digital Interface assy

• C.

Theodolite interface assy

• D.

A&B

C. Theodolite interface assy
Explanation
The correct answer is Theodolite interface assy. Theodolite interface assy is the component that connects between the digital theodolite assembly and the test station computer in the IAIS OTB systems.

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• 25.

### (409) The RF DAAE cooling system is described as such...

• A.

Intake on the rear of the staion, exhaust ports on top

• B.

Air Intake on the topof the station, exhaust ports on rear

• C.

Air Intake on the front of the station, exhaust ports on rear

• D.

Air Intake on rear of the station, exhaust ports in front

A. Intake on the rear of the staion, exhaust ports on top
Explanation
The correct answer is "Intake on the rear of the station, exhaust ports on top." This answer is correct because it describes the cooling system configuration of the RF DAAE station accurately. The intake being on the rear of the station allows for the intake of cool air, while the exhaust ports being on top allow for the hot air to be expelled efficiently. This configuration helps in maintaining proper cooling of the station and prevents overheating.

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• 26.

### (220) Which IAIS CCA provides biphase stimulus to the UUT,  and ten evaluates the biphase response from the UUT?

• A.

• B.

• C.

Dedicated input/output

• D.

Serial interface

D. Serial interface
Explanation
The serial interface is the IAIS CCA that provides biphase stimulus to the UUT and then evaluates the biphase response from the UUT.

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• 27.

### (020) In the AFSATCOM systems, what is the output power of the Type 1 terminal?

• A.

100 watts

• B.

100 db

• C.

1000 watts

• D.

1000 db

A. 100 watts
Explanation
The output power of the Type 1 terminal in AFSATCOM systems is 100 watts.

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• 28.

### (419) The HP Vectra computer acts as a controller for which subsystem?

• A.

Pulse Generator

• B.

Phase Noise

• C.

Power Control

• D.

VXI Mainframe

B. Phase Noise
Explanation
The HP Vectra computer acts as a controller for the Phase Noise subsystem. Phase noise refers to the random fluctuations in the phase of a signal. The HP Vectra computer, in this case, is responsible for controlling and managing the phase noise within the system. This could involve adjusting the frequency or phase of the signal to reduce unwanted noise and ensure accurate and reliable performance.

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• 29.

### (214) Which GPITM BIT operates independently of the other station assets by using GPIU stimulus and measurement resources other than the CCA being tested?

• A.

Initiated

• B.

Power-on

• C.

Continuous

• D.

Uninterrupted

A. Initiated
Explanation
The correct answer is "Initiated". In GPITM BIT, the initiated mode operates independently of other station assets by using GPIU stimulus and measurement resources other than the CCA being tested. This means that the initiated mode can be initiated and run without relying on other components or resources within the station.

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• 30.

### (406) An RF synthesizer 3A1A2, or synthesizer #1, provides CW and PM outputs for LRU testing, and also, after the MSC processes a PM input from the synthesizer , a_________signal is also available.

• A.

FM

• B.

Biphase

• C.

10 Mhz

• D.

PAM

B. Biphase
Explanation
After the MSC processes a PM input from the synthesizer, a Biphase signal is also available.

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• 31.

### (407) FM deviation is

• A.

Variations in amplitude of a radio frequency (RF) signal

• B.

The amplitude of the modulating signal

• C.

The phase shifting of a pulsed RF input by 0 and 180 degrees

• D.

Two signals of identical fequency experience a constantly changing phase relationship

B. The amplitude of the modulating signal
Explanation
FM deviation refers to the variations in the amplitude of a radio frequency (RF) signal. In Frequency Modulation (FM), the amplitude of the carrier signal is varied in accordance with the amplitude of the modulating signal. This modulation technique allows for the encoding of information in the frequency domain. As the amplitude of the modulating signal changes, the amplitude of the RF signal also varies, resulting in FM deviation.

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• 32.

### (205) (ESTS), Which power control circuit breaker controls power to the AC and DC power equipment assemblies?

• A.

MAIN POWER ON/OFF

• B.

VXI POWER ON/OFF

• C.

RF POER ON/OFF

• D.

PS POWER ON/OFF

D. PS POWER ON/OFF
Explanation
The correct answer is PS POWER ON/OFF. PS stands for Power Supply, and in this context, it refers to the power control circuit breaker that controls power to the AC and DC power equipment assemblies. This breaker is responsible for turning the power on or off to these equipment assemblies.

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• 33.

### (213) What GPIU subsystem provides general-purpose switching to set up the UUT IT and special purpose switching?

• A.

Switching subsystem

• B.

Internal bus subsystem

• C.

Waveform stimulus subsystem

• D.

Digital test subsystem

A. Switching subsystem
Explanation
The switching subsystem is responsible for providing general-purpose switching to set up the UUT IT (Unit Under Test Information Technology) and special purpose switching. This means that it allows for the configuration and control of different types of switches to connect various components and devices in the UUT. It enables the routing of signals and stimuli to the appropriate locations for testing and facilitates the communication between different subsystems within the GPIU (General Purpose Interface Unit).

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• 34.

### (222) How many components comprise the IUA?

• A.

11

• B.

10

• C.

8

• D.

9

A. 11
Explanation
The IUA (Interface User Adaptation) is a protocol used in telecommunication networks. It is comprised of 11 components that work together to facilitate the exchange of information between different network elements. These components include the IUA User, IUA Service User, IUA Service Provider, IUA Transport, IUA Transport User, IUA Peer User, IUA Peer Service Provider, IUA Peer Transport, IUA Peer Transport User, IUA Peer Service User, and IUA Peer. These components play specific roles in the communication process and ensure the smooth functioning of the IUA protocol.

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• 35.

### (031) What unit establishes communication on the 1553 MUX bus in backup mode for the F-15 up-front controls?

• A.

Central computer

• B.

Avionics interface unit

• C.

Central computer interface

• D.

Multipurpose display processor

D. Multipurpose display processor
Explanation
The multipurpose display processor establishes communication on the 1553 MUX bus in backup mode for the F-15 up-front controls.

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• 36.

### (405) Routing of alternating current (AC) power to line replaceable unit (LRU) power supplies in the radio frequency (RF) module is performed by the

• A.

COmputer assembly

• B.

Controlled turn-on panel

• C.

Direct current (DC) power switching unit

• D.

Microwave signal conditioner

B. Controlled turn-on panel
Explanation
The controlled turn-on panel is responsible for routing AC power to the LRU power supplies in the RF module. It ensures that the power is delivered in a controlled manner, preventing any sudden surges or fluctuations that could damage the equipment. By regulating the power supply, the controlled turn-on panel helps to maintain the stability and reliability of the RF module.

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• 37.

### (002) How many types of MB's are there?

• A.

3

• B.

4

• C.

5

• D.

6

A. 3
Explanation
There are three types of MB's.

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• Current Version
• Mar 15, 2023
Quiz Edited by
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• Jul 04, 2012
Quiz Created by
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