2A851N Cdc Vol 5 Self Test Questions

Front 1

List atleast three of the untis that can be displayed by the power meter.

Back 1

Watts, milliwatts, microwatts, nanowatts, decibels, relative decibels.

Front 2

Briefly explain how to use the relative power measurement mode for frequency response testing

Back 2

You set the dB(REF) for the transmitter under test, and then monitor any changes in power while tuning the transmitter to the different frequency settings.

Front 3

describe a power sesnor

Back 3

This is a device that changes energy from one form into another form.

Front 4

name some of the older power sources

Back 4

Bolometers, calorimeters, thermistors, and thermocouples

Front 5

what are some of the advantage of a diode detector over a thermistor munt?

Back 5

Higher sensitivity, reduced noise, less frequency drift, and a lower SWR.

Front 6

How much more efficient is a Schottky-detecting diode than a thermometer

Back 6

3,000 times more efficient.

Front 7

What device determines the power measurement range of a power meter?

Back 7

The power sensor.

Front 8

What must occur before you can use the power meter/power sensor system?

Back 8

The power meter and power sensor must be married, or calibrated together as a system.

Front 9

Why shouldn’t you twist a power sensor when connecting or disconnecting it?

Back 9

You may cause major damage to the power sensor’s internal circuits.

Front 10

What’s the basic RF power measurement?

Back 10

Average power.

Front 11

What must you do before turning the power meter on?

Back 11

Make sure it’s set to match the line voltage you’re using.

Front 12

After you’ve turned on the power meter, what’s the first task you must do?

Back 12

Zero the power sensor.

Front 13

How much RF input power is allowed when auto-zeroing the power sensor?

Back 13

None.

Front 14

What’s a TDR?

Back 14

A piece of test equipment that helps determine where an open or short is located in a wire or coaxial cable. It is an instrument that operates on the same principle as radar.

Front 15

On a TDR CRT, what does horizontal deflection represent?

Back 15

Distance.

Front 16

What does one horizontal division of the graticule represent?

Back 16

One-tenth of the selected distance.

Front 17

W

What does vertical deflection represent?

Back 17

Amplitude of the reflected signal plus the incident step.

Front 18

W

What’s a cable discontinuity?

Back 18

A physical fault in the cable, a physical fault in the end of the cable itself, or any irregularity that causes a change in the cable’s conductivity.

Front 19

What can be damaged if voltages enter the TDR’s CABLE connector?

W

Back 19

Sampling gate or tunnel diode.

Front 20

W

What must be done to the test cable before it’s connected to the TDR’s CABLE connector

Back 20

Always bleed it of any residual electrostatic charge.

Front 21

W

What care must be taken when testing receiving antenna cables

Back 21

Avoid close proximity to active transmitters

Front 22

What’s the purpose of the RFTLTS?

W

Back 22

Provide automatic testing and fault detection of coaxial and waveguide transmission line paths by performing IL measurements.

Front 23

W

What goes between the TDR’s CABLE connector and cable to be tested?

Back 23

The standard, 36-inch, 50-Ω cable

Front 24

Which CABLE DIELECTRIC switch is selected for use on cable with Teflon dielectric?

W

Back 24

Solid PTFE.

Front 25

O

What additional adjustment must be made to achieve highest accuracy when testing cables under two feet in length?

Back 25

The distance from the sampling bridge inside the TDR to the CABLE connector (2.5 inches or 635 cm) must also be deducted from the measurement.

Front 26

C

On a TDR, what does an upward deflection of the trace indicate? What does a downward deflection indicate?

Back 26

An open results in an upward trace. A short results in a downward trace

Front 27

Can a discontinuity be detected past a short or open in the cable?

W

Back 27

no

Front 28

C

Can RFTLTS check only individual RF components, or can it check the entire system?

Back 28

both

Front 29

W

What’s the frequency range of the RFTLTS in its basic design?

Back 29

From 10 MHz to 18 GHz.

Front 30

W

What data is stored in the RFTLTS EEPROM that will allow it to perform aircraft-specific tests?

Back 30

Aircraft RF transmission line parameters

Front 31

W

What type of display is used by the RFTLTS?

Back 31

Electroluminescent graphic display

Front 32

W

What must you do to protect the RFTLTS unit 1 from ESD events when you’re using the RFTLTS on the flightline?

Back 32

You must connect a suitable grounding strap between the grounding lug on the right side of RFTLTS unit 1 and the aircraft.

Front 33

Do you connect a measurement probe before or after you turn on power?

Back 33

Before

Front 34

What alignments must you perform before you can use RFTLTS for measurement?

Back 34

DTF self-alignment, IL self-alignment, and/or VSWR/return loss self-alignment.

Front 35

H

How long is the RFTLTS warm-up period?

Back 35

Normally 3 to 10 minutes

Front 36

H

How is a VSWR of 1.5:1 displayed on the RFTLTS electroluminescent display?

Back 36

RATIO 1.5.

Front 37

W

What range of resistance can be measured using the 4328A milliohmeter?

Back 37

.001 to 100 ohms.

Front 38

T

To ensure accuracy, what method of measuring resistance is used by the 4328A milliohmeter?

Back 38

The four-terminal method.

Front 39

What condition could cause the 4328A miliohmeter to produce an erroneous measuremtn reading?

Back 39

If both leads in one probe and the current lead only on the other probe make contact with the device under test.

Front 40

H

How long can the 4328A milliohmeter operate on battery power?

Back 40

Up to eight hours.

Front 41

W

What’s the allowable temperature range when using batteries on the 4328A milliohmeter?

Back 41

32°F to 113°F.

Front 42

W

What should you do if you are setting the 4328A milliohmeter to zero and the pointer overshoots?

Back 42

Continue rotating the adjustment screw clockwise until the pointer once again approaches the zero mark from the left.

Front 43

W

When using the 1 and 3 mΩ ranges on the 4328A milliohmeter, why should you pay special attention to the connection of current terminals to the sample?

Back 43

Firm contact is required at the probe end because excessive resistance at the probe contact can create a relatively larger error than when using the other ranges.

Front 44

H

How can you judge the quality of the connection of the probes to the sample?

Back 44

By applying pressure on the connection point and noting if the meter needle deflects.

Front 45

W

While using the 1 and 3 mΩ ranges, what problem could result if large electrically conductive materials were placed close to the probes or their cables?

Back 45

Large errors may result due to coupling between the current loop, the conductor and the voltage terminals.

Front 46

W

What are the units of force when you’re developing torque?

Back 46

Ounces, pounds, grams, and kilograms.

Front 47

W

What are the units of distance when you’re developing torque?

Back 47

Inches, feet, millimeters, and meters

Front 48

How are the magnitudes of torque most commonly expressed?

H

Back 48

Inch-pounds and foot-pounds.

Front 49

U

Using the torque conversion table found in figure 4–19, convert 3 foot-pounds to an equivalent torque in inch-pounds.

Back 49

36 inch-pounds.

Front 50

D

Describe the four types (I, II, III, and IV) of torque wrenches.

Back 50

A type I torque wrench uses a deflecting needle that reads on a fixed scale; a type II torque wrench uses a dial and needle indicator; a type III torque wrench has a micrometer-like adjustment sleeve that varies the indicated torque, and breaks over or produces a "snap" when the indicated torque value has been reached; and a type IV torque wrench is nonadjustable, has a preset torque value built into it, uses a precision-calibrated power spring, breaks over or "snaps" when the preset torque value has been achieved, and the preset torque value is normally stamped on the end of the handle.

Front 51

W

What’s the purpose of a balanced torquing sequence?

Back 51

To prevent warping the assembly being torqued.

Front 52

W

When are torque requirements met?

Back 52

When the minimum torque value is reached

Front 53

Under what circumstances should you use a torque wrench to break loose a bolt?

U

Back 53

Never.

Front 54

What should you do if you’ve over-torqued a bolt, nut or screw?

W

Back 54

Loosen it and start again.

Front 55

What fastening devices are normally associated with prevailing torque?

W

Back 55

Self-locking nuts and screws.

Front 56

W

When must you compensate for prevailing torque?

Back 56

When required by the technical data.

Front 57

W

When using an extension, what three items of information do you need in order to find the modified torque handle setting?

Back 57

The length of the torque wrench, the effective length (the length of the torque wrench plus its extension), and the recommended torque value.

Front 58

C

Compute the modified torque value for 120 inch-pounds of recommended torque using a 12-inch torque wrench with an 8-inch extension

Back 58

72 inch-pounds.

Front 59

W

What must you do if you drop a calibrated torque wrench?

Back 59

Have the wrench recalibrated before it’s used again.

Front 60

How do newer aircraft act as their own bus analyzer?

H

Back 60

By downloading data through the aircraft DTU and reviewing the data on a laptop computer with the appropriate software.

Front 61

W

What are the four basic functions of a bus analyzer?

Back 61

Data display, error logging and analysis, simulation, and playback of data.

Front 62

T

The fail history of an aircraft is an example of which function of a bus analyzer?

Back 62

Error logging and analysis.

Front 63

U

Using bus analyzer data to recreate a scenario in a controlled environment is an example of what function?

Back 63

Playback of data.

Front 64

H

How is the SBA–100 keyboard assembly enabled?

Back 64

When system power is applied using the front-panel ON/OFF keypad switch.

Front 65

W

What does the SBA–100 front-panel assembly consist of?

Back 65

A 24-key keypad, the CRT monitor, and the tape unit.

Front 66

W

What does it mean when the SBA–100 front-panel ACTY indicator is yellow?

Back 66

SBA is detecting bus activity on the connected bus.

Front 67

W

What is the purpose of the tape drive assembly DC 300A data cartridges?

Back 67

To store and retrieve data.

Front 68

W

1. Why is sealant used on the aircraft?

Back 68

To protect against corrosion caused by water, fumes and the atmosphere; prevent pressurizing air from escaping the crew compartment and certain equipment compartments; prevent the spread of fire in the engine sections and auxiliary power unit compartments of the engine nacelles; prevent fumes and fuel leaks in the walls inside the fuel tanks; prevent damage, corrosion, fire and electrical failure at selected points in the electrical system; gaps, mismatches, and other irregularities are filled and leveled out to permit air to flow smoothly over the surfaces on the outside of the airplane.

Front 69

What property does curing-type sealant have?

W

Back 69

They have an application time during which sealant remains suitable for use.

Front 70

W

What is the purpose of a gasket?

Back 70

A gasket is used between waveguides sections to prevent energy leakage.

Front 71

What can leakage of frequency energy cause?

W

Back 71

It can interfere with, even to the point of overpowering, neighboring electronic devices (hence the leakage is termed electromagnetic interference), and also cumulatively reduces the transmitted energy level.

Front 72

W

Why is a gasket used between the joints of waveguides?

Back 72

It is easy to use, eliminating the need for tapes and insulate against RF leakage from waveguides. The gasket permits the waveguide sections to be readily assembled and disassembled, and does not contaminate the interior of the waveguide.

Front 73

D

During a transponder confidence test, what test lamps should illuminate immediately after the system is turned on?

Back 73

The XTAL CUR and HVPS lamps

Front 74

W

What’s the function of the TS–1843A T/S when it isn’t being used for testing?

Back 74

It’s a coupler that provides a path for the transmitted and received signals.

Front 75

W

What type signal is generated by the TS–1843A in the TEST mode?

Back 75

RF interrogation pulse pairs for the mode selected.

Front 76

What would be the indication if an invalid transponder reply is transmitted after being interrogated by the TS–1843A?

W

Back 76

The test lamp on the control box would NOT illuminate.

Front 77

W

What’s the voltage produced by the battery stick?

Back 77

7.2 VDC.

Front 78

W

What’s the purpose of the standard battery end cap and battery contact assembly?

Back 78

Used to adapt the TS–3977 to use six standard batteries in place of the battery stick.

Front 79

H

How is the TS–3977 test routine initiated?

Back 79

By pressing either the TEST SEQ or TEST RPT button.

Front 80

I

In what increments is mode C altitude displayed on the TS–3977?

Back 80

In hundreds and thousands of feet.

Front 81

W

What’s the malfunction if an "F" appears in the test code indicator of the TS–3977?

Back 81

The T/S has failed self-test.

Front 82

What’s the color of the TS–3977 lobing indicator?

W

Back 82

Yellow.

Front 83

W

What action is necessary if the decimal points on the TS–3977 display are flashing on and off when the LAMP TEST button is pressed?

Back 83

Replace the battery stick.

Front 84

W

What transponder failure code will appear in the test code indicator if the transponder receiver sensitivity is low?

Back 84

Six.

Front 85

W

What feature of the TS–3977 is useful in checking out the different transponder reply codes of each mode?

Back 85

TEST RPT (repeat).

Front 86

When should the battery stick be removed from the TS–3977 T/S?

Back 86

If the T/S will be idle for more than 24 hours.

Front 87

W

What’s the purpose of the TACAN T/S?

Back 87

It simulates the ground station and produces all of the necessary signals for various tests.

Front 88

W

What’s an advantage of using the T/S in the radiation method?

Back 88

Several aircraft can be checked simultaneously

Front 89

W

What are two most important facts to remember when using the T/S?

Back 89

　

Safety and proper use of the T/S following instructions in the appropriate TOs.

Front 90

I

　

ID TONE switch.

Back 90

　

Provides BIT when depressed.

Front 91

R

　

RANGE IN/OUT switch.

Back 91

　

　

Provides DME tracking rate of 2,400 knots

Front 92

　

BEARING CW/CCW switch

B

Back 92

Provides azimuth tracking rate of 5° per second.

Front 93

B

　

BURST switch.

Back 93

　

Used to turn MRB on and off.

Front 94

　

RF OUTPUT control

R

Back 94

　

Used to measure TACAN receiver sensitivity.

Front 95

R

　

RF POWER OUTPUT meter

Back 95

　

Calibrated in kilowatts

Front 96

M

　

MODE switch.

Back 96

　

Provides selection of air-to-air function.

Front 97

R

　

RANGE-NAUT MILES switch

Back 97

　

Provides fixed range of 50 miles.

Front 98

I

If you plan to use the direct-connection method, what must you connect to the TACAN R/T unit antenna jack?

Back 98

After first disconnecting the antenna cable from the TACAN R/T unit, connect an RF cable from the RF IN/OUT jack on the T/S to the TACAN RF unit antenna jack.

Front 99

I

If you plan to use the radiation method, in what position must the T/S antenna be during the system checkout?

Back 99

Vertical.

Front 100

I

If the green light is illuminated on the ARM–186 T/S, how many operating hours are available on the battery charge?

Back 100

1 to 8 hours of operation remain on the battery charge.

Front 101

A

After the red light illuminates, how long should the battery be recharged?

Back 101

For a minimum of 36 hours.

Front 102

W

What are the selectable bearings on the ARM–186 T/S?

Back 102

VOR bearings from 0 to 315° in 45° increments throughout the 360° range.

Front 103

How can the GS flag be checked using the ARM–186 T/S?

H

Back 103

By deleting either the 90-Hz or 150-Hz GS signal.