7.4: Avionic General Test Equipment Flashcards
Q1 When using a TDR Time Domain Reflectometry Test set it is important to set
(a) The correct frequency before you start
(b) The longest pulse width before you start
(c) The correct VOP velocity of propagation
(c) The correct VOP velocity of propagation
Q2 A PMAT is a
(a) Practical Maintenance Access termination
(b) Practical maintenance Access Terminal
(c) Portable Maintenance Access Terminal
(c) Portable Maintenance Access Terminal
Q3 A DITS reader would be used to
Read digital maintenance manuals
Read the output data from a digital flight recorder
Read data from a 429 data bus
Read data from a 429 data bus
Q4 In order to measure the logic level in a digital circuit I would use
(a) A digital analyser
(b) A logic probe
(c) A Nav/Comm test set
(b) A logic probe
Q5 In order to connect a pitot static test set to the aircraft I would use
(a) A data bus
(b) Hoses and adapters
(c) Pitot and static quick disconnects
(b) Hoses and adapters
Q6 A Nav/Comm test set is used to test..
(a) VHF Comms, Marker Beacon, VOR, Localiser, Glideslope
(b) VHF Comms, HF High Frequency, Marker Beacon, VOR, Localiser
(c) VHF Comms, Marker Beacon, DME, Localiser, Glideslope
(a) VHF Comms, Marker Beacon, VOR, Localiser, Glideslope
Q7 What do you have to check before you use a battery operated instrument
(a) That the due date sticker is within limits
(b) That the battery voltage is adequate
(c) The instrument is showing full scale deflection
(b) That the battery voltage is adequate
Q8 To measure the voltage across a resistor in a circuit the voltmeter is connected
(a) In series with the resistor
(b) In parallel with the resistor
(c) In either series or parallel with the resistor
(b) In parallel with the resistor
Q9 When a moving coil ammeter is connected in a circuit to measure a high current, most of the current goes through the
(a) Multiplyer resistor
(b) Through the shunt
(c) Through the moving coil in the meter
(b) Through the shunt
Q 10 When using a DME/ATC test set to check the ATC Transponder it is important to
(a) Connect the correct pitot and static pressures
(b) To set the test set to the correct velocity of propagation VOP
(c) To shield one of the antennas
(c) To shield one of the antennas
Q 11 To change the voltage ranges on a voltmeter
(a) A shunt is used
(b) A multiplier is used
(c) A low value resistor is used.
(b) A multiplier is used
Q 12 To change the voltage per division on an oscilloscope
(a) Chop mode is used
(b) Alternate mode is used
(c) An attenuator is used
(c) An attenuator is used
Q 13 To obtain a dual trace on an oscilloscope with a single beam
(a) Chop mode only is used
(b) Alternate mode only is used
(c) Chop and alternate mode is used
(c) Chop and alternate mode is used
Q 14 If the voltage on a ratiometer type bonding meter falls by 10%
(a) The test set cannot be used
(b) The battery must be recharged before the test set can be used
(c) The test set may be used
(c) The test set may be used
Q 15 The insulation resistance found in the galley areas of an aircraft is
(a) 0.05 Ohms
(b) 1 Ohm
(c) 5 MOhms
(c) 5 MOhms
Q 16 A dielectric strength (HIPOT) test is carries out at
(a) 2 X operating voltage
(b) 2 X operating voltage + 1,000 volts
(c) 250V
(b) 2 X operating voltage + 1,000 volts
Q17 A TONG tester
(a) Is a clamp-on current meter for a single cable
(b) A clamp-on meter for a twisted pair cable
(c) A loop resistance tester
(a) Is a clamp-on current meter for a single cable
Q18 Where must a megger not be used
(a) Fuel tanks and wheelwells
(b) Circuits with semiconductors and capacitors
(c) Capacitors and wheelwels
(b) Circuits with semiconductors and capacitors
Q 19 Output of a safety Ohmeter is
(a) 250V and 10 mA
(b) 30V and 10mA
(c) 30V and 100mA
(b) 30V and 10mA
Q20 In what order are circuits tested
(a) Bonding check, then continuity check, then insulation check, then function check
(b) Continuity check, then insulation check, then function check then Bonding check
(c) Bonding check, then insulation check, then function check, then continuity check
(a) Bonding check, then continuity check, then insulation check, then function check
- When using a moving coil as an ammeter the greatest amount of current flows through the
a) coil
b) shunt
c) bushes
b) shunt
- To carry out an insulation test on a wire rated at 115 volts you would use
a) a 500 volt meggar
b) a 250 volt meggar
c) a 115 volt meggar
b) a 250 volt meggar
- The insulation resistance for wiring in undercarriage wheel wells should normally be not less than
a) 10 megohms
b) 5 megohms
c) 2 megohms
c) 2 megohms
- Circuit tests on aircraft should be carried out in the following order
a) continuity, bonding, functional, insulation
b) functional, bonding, continuity, insulation
c) bonding, continuity, insulation, functional
c) bonding, continuity, insulation, functional
- After the normal function test of an individual circuit has been completed and the circuit switched off
a) a second function test must be carried out to verify the first
b) the fuse should be removed and the circuit again switched on to check the isolation of the circuit concerned
c) a duplicate check must be carried out in accordance with AWN 3
b) the fuse should be removed and the circuit again switched on to check the isolation of the circuit concerned
- A 250 volt megger should not be used
a) in fuel tanks
b) on electronic equipment
c) on radio aerials
a) in fuel tanks
- If the leads of a megger are held apart
a) the spring will return the needle to the zero stop
b) if the handle was turned the meter would read infinity
c) the spring will return the needle to infinity
b) if the handle was turned the meter would read infinity
- To find a high resistance or open circuit, carry out
a) a bonding check
b) a milli-volt drop test
c) a continuity check
c) a continuity check
- The maximum bonding resistance on an aircraft primary structure should be
a) 0.001 ohms
b) 0.01 ohms
c) 0.05 ohms
c) 0.05 ohms
- One megohm is equal to
a) 1,000 ohms
b) 100,000 ohms
c) 1,000,000 ohms
c) 1,000,000 ohms
- The leads of a bonding tester
a) have critical lengths and the resistance of the leads is accounted for
b) are supplied in 60 foot and 6 foot lengths but can be varied due to wear
c) are interchangeable, one 60 foot long having two prongs and a 6 foot one with a single prong
a) have critical lengths and the resistance of the leads is accounted for
- The test equipment normally used to carry out a continuity test on an electrical cable is
a) a high tension circuit tester
b) a low reading ohmmeter
c) an ammeter
b) a low reading ohmmeter
- If all three prongs on a bonding tester were shorted together, the meter would read
a) zero
b) FSD
c) off-scale high
a) zero
- When measuring current in a circuit, the ammeter is placed
a) in series with the circuit
b) in parallel with the circuit
c) in series with the shunt
a) in series with the circuit
- An open circuit on an ohmmeter would be indicated by a reading of
a) infinite resistance
b) zero resistance
c) a negative resistance
a) infinite resistance
- The leads of an ohmmeter should be replaced if their resistance is greater than
a) 0.05 ohms
b) 0.5 ohms
c) 1 ohm
c) 1 ohm
- Which electrical measuring device needs a power source
a) a voltmeter
b) an ammeter
c) an ohmmeter
c) an ohmmeter
- When measuring voltage or current with a digital multimeter, the indication is
a) peak values
b) RMS values
c) Average values
b) RMS values
- On a multimeter, what colour lead is connected to the Common socket
a) red
b) black
c) green
b) black
- A voltage drop across a component is measured by placing the meter in
a) parallel with the component
b) series with the component
c) series with the power source
a) parallel with the component
- Why are test or inspection instruments regularly calibrated and certified?
a) To ensure they are being used regularly
b) To ensure they will perform within the required limits of operation
c) To ensure they can handle the range of measurements required of them
b) To ensure they will perform within the required limits of operation
- Before using a bonding tester, the 6 foot lead has the two prongs shorted together with a piece of metal. What would the indicator read?
a) Full scale left
b) Full scale right
c) Zero at the centre
b) Full scale right
- When using a megger to test insulation resistance, capacitive filters should be disconnected for what reason?
a) Remove the risk of damage to the megger
b) Remove the spurious readings caused by the capacitors charging and discharging
c) Prevent damage to the filters
c) Prevent damage to the filters
- What is the maximum resistance between the main earth system and a metal plate on which the earthing device (tyre) is resting?
a) 1 megohm
b) 10 megohms
c) 100 megohms
b) 10 megohms
- If the leads of a bonding tester are damaged, what is the procedure?
a) A new lead may be manufacturers using the correct current rated cable
b) Provided that the damage is situated dose to the end of the leads the cable may be shortened
c) The damaged leads and the tester should be returned to the manufacturer for repair and calibration
c) The damaged leads and the tester should be returned to the manufacturer for repair and calibration
- When carrying out a continuity test on a circuit when a known resistance exists, what instrument would you use?
a) A multimeter
b) A high resistance insulation tester
c) A lamp and battery
a) A multimeter
- Effective continuity is not possible unless which of the following conditions exists?
a) All circuit earths are disconnected
b) The portion of the circuit under test must constitute a simple series circuit with no parallel paths
c) All manually operated switches must be off
b) The portion of the circuit under test must constitute a simple series circuit with no parallel paths
- Why is a low voltage supply used for continuity testing?
a) To avoid damage to the wiring
b) To avoid breaking down a high resistance film that might exist between contacting surfaces
c) To prevent fuses “blowing” and lamps burning out
c) To prevent fuses “blowing” and lamps burning out
- If an insulation resistance tester is operated and the leads are suspended in free air, what will the meter read?
a) Infinity
b) Zero
c) Mid scale - it is a ratiometer movement and there is no current flowing in the external circuit
a) Infinity
- An Insulation test is carried out on a group of cables and a low reading obtained. What action would you take?
a) Change or renew all the cables involved in the test
b) Break the circuit down and carry out further checks
c) A low reading would be expected because the cables are in parallel
b) Break the circuit down and carry out further checks
- What is a typical min insulation resistance value for an aircraft undercarriage bay?
a) 10 megohms
b) 5 megohms
c) 2 megohms
c) 2 megohms
- The intervals for calibration of test equipment
a) are every year
b) are as specified in JAR 145
c) are different from one appliance to another
c) are different from one appliance to another
- A multiplier resistance is used to extend the working range of the
a) ammeter
b) voltmeter
c) ohmeter
b) voltmeter
- When using bonding tester
a) ensure prongs penetrate anodised layer
b) ensure prongs do not penetrate anodising layer
c) an anodised component cannot be tested
a) ensure prongs penetrate anodised layer
- To measure AC with a moving coil, it
a) is rectified and measures peak value
b) is rectified and measures RMS value
c) can be directly connected
b) is rectified and measures RMS value
- If an ammeter reads 0 - 1mA FSD, what would you be required to do to enable it to read 10mA FSD?
a) Place a 9 ohm resistor in series with the meter
b) Place a 9.9 ohm resistor across the coils
c) Place a 5.8 ohm resistor as a shunt in parallel with the meter
c) Place a 5.8 ohm resistor as a shunt in parallel with the meter
- What should be done if a signal generator is found not to be working to its calibrated requirements?
a) It should be removed from service, marked as unserviceable and sent away for overhaul
b) A mechanic should adjust it to restore it to the correct operation
c) It should be placed back into stores and kept in service until the next calibration is due
a) It should be removed from service, marked as unserviceable and sent away for overhaul
- The internal resistance of a voltmeter is
a) high
b) low
c) no more than 0.05 ohms
a) high
- The internal resistance of an ammeter is
a) high
b) low
c) 1 ohm
b) low
- To carry out an insulation test on a wire rated at 115 volts you would use
a) a 500 volt meggar
b) a 250 volt meggar
c) a 115 volt meggar
b) a 250 volt meggar
- How would you test a mach switch in-situ?
a) It is not possible to test a mach switch in situ
b) Use an external test kit
c) Use built in test equipment
b) Use an external test kit
***NEED TO BE CONFIRMED - CONFLICTING ANSWERS
- That device is used to generate alternating current of desired frequencies and amplitudes?
(a) Oscilloscope
(b) Signal generator
(c) Time domain reflector
(b) Signal generator
What device is used to regulate the voltage output in a signal generator?
(a) Amplifier
(b) Decade Box
(c) Attenuator
(c) Attenuator
A signal generator used for testing LOC, G/S, VOR< MKR and communication systems is called?
(a) Communication Tester
(b) Nav-Com Ramp Tester
(c) ATC Transponder Tester
(b) Nav-Com Ramp Tester
What device is used for testing altitude and airspeed indications?
(a) DME test set
(b) Pitot-Static Test Set
(c) Transponder Test Set
(b) Pitot-Static Test Set
Fuel Quantity Indication Tester works on the principle of
(a) Resistance
(b) Power
(c) Capacitance
(c) Capacitance
Using an oscilloscope the voltage at selected test point is measured as 100V. What is the equivalent RMS voltage?
(a) 65V
(b) 50V
(c) 70V
(c) 70V
What device is used to determine the digital state of an electronic circuit?
(a) Oscilloscope
(b) Time domain Reflector
(c) Logic Probe
(c) Logic Probe
If the arrow is toward the load, a RF Directional Wattmeter is measuring the
(a) Forward Power
(b) Reflected Power
(c) Electrical Power
(a) Forward Power
- The D’Arsonval meter movement is damped to prevent which of the following conditions?
a) Oscillating readings
b) Inconsistent readings
c) Consistently low readings
a) Oscillating readings
- Peak to peak voltage display on oscilloscope measures 3cm. The volts/div is selected to 2Volts. What is the peak voltage value?
(a) 6 Volts
(b) 3 Volts
(c) 2 Volts
(b) 3 Volts
What device is used to substitute loads in an electrical system?
(a) Attenuators
(b) Decade Boxes
(c) Capacitors
(b) Decade Boxes
- If all three prongs on a bonding tester were shorted together, the metre would read
a) zero
b) FSD
c) off-scale high
b) FSD
(***Surely answer not a) zero - q under review)
The figure above shows an oscilloscope screen displaying an AC voltage. The oscilloscope is set to 1 Volt/div and 5ms/div. What is the RMS voltage and frequency of the signal.
(a) 3Volt, 60Hz
(b) 2Volt, 30Hz
(c) 1Volt, 1.2KHz
(b) 2Volt, 30Hz
Actual is 33.33 Hz & 3X.707V = 2.1V closest is b
- What two modes are used to obtain the dual trace on an oscilloscope?
a) Chop and beam
b) Chop and alternate
c) Slow sweep and beam
b) Chop and alternate
Question Number. 1. A fuel quantity test set has an externally adjustable.
Option A. capacitor.
Option B. inductor.
Option C. resistor.
Option C. resistor.
Explanation. AL/10-3 8.2.6.
Question Number. 2. How would you test a mach switch in-situ?.
Option A. Use built in test equipment.
Option B. Use an external test kit.
Option C. It is not possible to test a mach switch in situ.
Option A. Use built in test equipment.
***NEED TO BE CONFIRMED -CONFLICTING ANSWERS
Question Number. 3. The maximum value of bonding of a secondary structure is.
Option A. 1 megohm.
Option B. 1 ohm.
Option C. 1 kilohm.
Option B. 1 ohm.
Explanation. CAIP S EEL/1-6 Para 3-8.
Question Number. 4. Circuit tests on aircraft should be carried out in the following order:
Option A. bonding, continuity, insulation, functional.
Option B. continuity, bonding, functional, insulation.
Option C. functional, bonding, continuity, insulation.
Correct Answer is. bonding, continuity, insulation, functional.
Explanation. Code to remember, B C I F.
Question Number. 5. Before using a dead weight tester you would.
Option A. calibrate the tester using a standard weight.
Option B. pressurize the tester to the required pressure.
Option C. replace the oil.
Correct Answer is. pressurize the tester to the required pressure.
Explanation. The dead weight tester is first pumped up to the required pressure (platform/weights floating) then gauge under test is connected.
Question Number. 6. How should a dead weight tester be used?.
Option A. The pressure increasing handle should be screwed in before the addition of fluid and screwed out when fluid is added.
Option B. The outlet should not be connected to the instrument until the required weights are raised by the platform.
Option C. The platform should be removed and fluid poured into the hole.
Correct Answer is. The outlet should not be connected to the instrument until the required weights are raised by the platform.
Explanation. Handle is wound in until the weights are floating, then the outlet pressure is slowly released to the gauge under test.
Question Number. 7. When testing thermocouples using a test set the ambient temperature.
Option A. never needs to be considered.
Option B. is considered every time.
Option C. is only considered when temperatures of 20°C or above.
Correct Answer is. is considered every time.
Explanation. AL/10-3 11.11.1. To test the system the test set has to be trimmed for ambient temperature, as the system when in operation is adjusted for ambient temperature by the compensating resistor. This is clearly stated in the B 737 AMM.
Question Number. 8. Electronic test equipment for fuel tank contents systems usually incorporate variable.
Option A. resistors.
Option B. inductors.
Option C. capacitors.
Correct Answer is. capacitors.
Question Number. 9. Before using a bonding tester, the 6 foot lead has the two prongs shorted together with a piece of metal. What would the indicator read?.
Option A. Full scale left.
Option B. Full scale right.
Option C. Zero at the centre.
Correct Answer is. Full scale right.
Explanation. Leaflet 9-1 3.10.2 a Infinity is full scale to the right.
Question Number. 10. When using a megger to test insulation resistance, capacitive filters should be disconnected for what reason?.
Option A. Remove the risk of damage to the megger.
Option B. Remove the spurious readings caused by the capacitors charging and discharging.
Option C. Prevent damage to the filters.
Correct Answer is. Prevent damage to the filters.
Explanation. Leaflet 9-1 4.4.4 e AandP Mechanics General Handbook Pg 351.
Question Number. 11. When carrying out a serviceability check on a bonding tester - short together the three prongs of both probes and ensure which of the following?.
Option A. The meter reads 0.1 ohm.
Option B. A zero reading.
Option C. A full scale reading is obtained.
Correct Answer is. A zero reading.
Explanation. Leaflet 9-1 3.10.2 (b).
Question Number. 12. If an insulation resistance tester is operated and the leads are suspended in free air, what will the meter read?.
Option A. Zero.
Option B. Mid scale - it is a ratiometer movement and there is no current flowing in the external circuit.
Option C. Infinity.
Correct Answer is. Infinity.
Question Number. 13. When using a digital meter to test a diode, a correct operation of the diode is indicated by a volt drop of.
Option A. 0.3V to 0.7V.
Option B. 2.5V to 2.8V.
Option C. 1.5V to 2V.
Correct Answer is. 0.3V to 0.7V.
Explanation. Forward voltage drop of a diode is 0.2V (germanium) or 0.6V (silicon).
Question Number. 14. To check that the ident pulse is being generated from an ATC transponder,.
Option A. select an ATC channel and check the morse code.
Option B. select ident and check the indication on the instrument panel.
Option C. press the ident and monitor the indication on the ramp test set.
Correct Answer is. press the ident and monitor the indication on the ramp test set.
Explanation. The ident is a button on the transponder panel, which, when pressed, causes the indication on the ATCs radar screen to ‘bloom’.
Question Number. 15. A pressure gauge is fitted to a Dead Weight Tester. The piston area is 0.25 sq.in. and the total mass of the mass carrier and masses is 5lb. If the pressure gauge is accurate what pressure in pounds per square inch (PSI) will it read?.
Option A. 1.25 psi.
Option B. 20 psi.
Option C. 200 psi.
Correct Answer is. 20 psi.
Explanation. Pressure = Force / Area = 5/0.25 = 20 PSI.
Question Number. 16. When testing a fuel metering unit, how is it checked?.
Option A. With the meter in series with the unit.
Option B. With the unit disconnected.
Option C. With the meter in parallel with the unit.
Correct Answer is. With the meter in series with the unit.
Explanation. A fuel metering unit is checked with the fuel meter in series with the meter under test. No reference found.
Question Number. 17. When using a bonding tester.
Option A. ensure prongs penetrate anodised layer.
Option B. ensure prongs do not penetrate anodising layer.
Option C. an anodised component cannot be tested.
Correct Answer is. ensure prongs penetrate anodised layer.
Explanation. Leaflet 9-1 Para.3.10.6.
Question Number. 18. On a static leak tester, pressure is released by.
Option A. an internal balance valve in the tester.
Option B. slowly opening the release knob for 3 minutes.
Option C. a bleed valve in the tester.
Correct Answer is. slowly opening the release knob for 3 minutes.
Explanation. The pressure in the pitot/static leak tester must be released slowly.
Question Number. 19. A fuel calibration test set when used to check an aircraft with half a fuel load is connected.
Option A. to gauge with fuel level in parallel.
Option B. to gauge with fuel level capacitance.
Option C. to gauge with fuel level in series.
Correct Answer is. to gauge with fuel level in series.
Explanation. The test set is connected in series with the fuel level conditioner.
Question Number. 20. A capacitive fuel contents system should be tested with.
Option A. a ratiometer.
Option B. a Wheatstone bridge.
Option C. a decade box.
Correct Answer is. a Wheatstone bridge.
Explanation. By elimination.
Question Number. 21. Continuity of a fibreoptic cable is tested with a.
Option A. light source and optometer.
Option B. multimeter.
Option C. calibrated light generator and opto-power meter.
Correct Answer is. calibrated light generator and opto-power meter.
Explanation. External website. http://www.tpub.com/neets/tm/109-13.htm
Question Number. 22. When using transistorized test equipment, what should the output be?.
Option A. Not affected by impedance.
Option B. High impedance.
Option C. Low impedance.
Correct Answer is. Low impedance.
Explanation. Transistorised equipment generally has a high input impedance and a low output impedance.
Question Number. 23. To read the transponder coding from an aircraft’s transponder you.
Option A. use the code signal and a chart to determine the signal.
Option B. use a ATC600 test set.
Option C. use the output on the flight deck.
Correct Answer is. use a ATC600 test set.
Explanation. Jeppesen Aircraft Radio Systems - Powell Page 136/7.
Question Number. 24. Bonding lead testers are attached with.
Option A. a 60 feet lead is connected to the main earth and a 6 foot test lead is connected to check the resistance between selected points.
Option B. a 6 feet test lead is connected to the main earth and a 60 feet lead is connected to check the resistance between selected points.
Option C. either of the leads can be connected anywhere.
Correct Answer is. a 60 feet lead is connected to the main earth and a 6 foot test lead is connected to check the resistance between selected points.
Explanation. Leaflet 9-1 3.10.3.
Question Number. 25. On a Bonding Tester the number of probes on the 60 ft and 6ft leads respectively are.
Option A. 1 and 2.
Option B. 2 and 2.
Option C. 2 and 1.
Correct Answer is. 1 and 2.
Explanation. Leaflet 9-1 3.10.
Question Number. 26. The damping force in a meter.
Option A. prevents oscillation of the pointer.
Option B. returns the pointer to zero.
Option C. assists the pointer to move over the scale.
Correct Answer is. prevents oscillation of the pointer.
Question Number. 27. On a VOR/ILS test set the ‘Tone Delete’ function.
Option A. functionally checks that the glideslope pointer moves down-scale.
Option B. functionally checks that the glideslope failure flag operates.
Option C. functionally checks that the glideslope pointer moves up-scale.
Correct Answer is. functionally checks that the glideslope failure flag operates.
Explanation. The Tone Delete tests the flag.
Q 10 Which of the following instruments can be affected when carrying out a
Pitot/Static Test and excessive rate of change is introduced ?
(a) VSI, Altimeter, ASI and RA.
(b) ASI, Cabin Altimeter and VSI.
(c) RA, Cabin Altimeter and Altimeter.
(b) ASI, Cabin Altimeter and VSI.
Q 11 What, if any, would a fuel quantity measuring system without a
compensator read, if the relative permitivity of the fuel used was decreased
(a) The indication would over-read.
(b) The indication would under-read.
(c) The indication would not be affected.
(b) The indication would under-read.
Q 12 After installation of a TCAS System and carrying out a Bearing Check, the
Intruder Bearing is found to be 90° from the Selected Bearing. The
probable cause is that the: -
(a) upper antenna is selected when it should be the lower.
(b) TCAS is set to TA/RA Mode.
(c) Antenna Coax cables areincorrectly rotated.
(c) Antenna Coax cables areincorrectly rotated.
A signal generator used for testing LOC, G/S, VOR & MRK is called a _____________
Nav-Com ramp test set
Fuel quantity indicator test set uses ________
Capacitance
What two methods are used to obtain the dual trace on an oscilloscope
- Chop
- Alternate
Why is D’Arsonval meter movement damped?
D’Arsonval meter movement is damped to prevent oscillating readings
What is a multiplier resistor used for?
A multiplier resistor is used to extend the working range of a voltmeter
How would you measure a current of 100 amps with an Ammeter?
To measure a current of 100 amps an Ammeter uses a shunt in parallel with the meter
Digital multimeter = _______________
Digital multimeter = RMS values
Ratiometers require a power soruce that ________
can fluctuate
Safety Ohmmeter (detonator circuit, fire bottles) ______ Volts DC, ____ mA
30 Volts DC, 10 mA
What has to be noted about semiconducotrs and meggers?
Equipment containing semiconductors cannot be meggered
Maximum permissible milli-volt drop across a connection that is being tested for high resistance is ___________
5 mV/10 amps
Unscreened cables should be separated by ________
18 inches
What is the max amount of terminals allowed on 1 stud?
Max 4 terminals on 1 stud
Two wires are connected to a common terminal, they have different _______________
segment letters
What is a Triaxial cable?
Triaxial cable - double shielded wire and a single core
Checking a Co-ax cable use a _______________
Time domain reflectometer
Conductors must have low insulation resistance to minimize ____________
IR losses
What gives rise to wet arc tracking?
Insulation damage and fluid contamination gives rise to wet arc tracking
Limiting resistors are connected permanently in ? (series or parallel)
series
Where does most current flow through in a moving coil ammeter?
Moving coil ammeter, most current flows through the shunt
Circuit tests on aircraft should be carried out in what order? (not in order below)
Bonding
Continuity
functional
Insulation
- Bonding
- Continuity
- Insulation
- Functional
What colour is the common socket on a mulitmeter?
Common socket on a multimeter is black
Is the internal resistance on a voltmeter high or low?
Internal resistance of a voltmeter is high
Is the internal resistance of a ammeter high or low?
Internal resistance of an ammeter is low
How would you regulate the voltage output in a signal generator?
To regulate the voltage output in a signal generator, use a Attenuator
What is a logic probe used for?
Logic probe is used to determine the digital state of an electronic circuit
If all three prongs on a bonding meter were shorted together, what would the metre read?
All three prongs on a bonding tester were shorted together, the metre would read FSD
(Answer not 0? question under review)
Dielectric strength test. High potential insulation test is at ________________
Dielectric strength test. High potential insulation test is at twice the normal operating voltage plus 1000 volts
Low bond, _____ side
High bond, _____ side
Low bond, Left side
High bond, right side
What are the dielectric constants of the following:
Air
Fuel
Water
Dielectric constant
Air - 1
Fuel - 2.7
Water - 78.2
What would a DITS reader be used to read?
A DITS reader would be used to read data from a 429 data bus
What is it important to do when using a TDR time Domain Reflectometry Test set?
When using a TDR Time Domain Reflectometry Test set it is important to set the correct VOP velocity of propogation
How would you setup the FIXED coil and the MOVING coil when using a wattmeter to read power in a circuit>
Using a wattmeter to read power in a circuit. Connect the FIXED coil in SERIES with the load ‘CURRENT’ and the MOVING coil ACROSS the load ‘‘VOLTAGE’’
Q 10 Which of the following instruments can be affected when carrying out a
Pitot/Static Test and excessive rate of change is introduced ?
(a) VSI, Altimeter, ASI and RA.
(b) ASI, Cabin Altimeter and VSI.
(c) RA, Cabin Altimeter and Altimeter.
(b) ASI, Cabin Altimeter and VSI.
Module 7 . 4 . 1
Q 11 What, if any, would a fuel quantity measuring system without a
compensator read, if the relative permitivity of the fuel used was decreased
(a) The indication would over-read.
(b) The indication would under-read.
(c) The indication would not be affected.
(b) The indication would under-read.
Module 7 . 4 . 1
Q 12 After installation of a TCAS System and carrying out a Bearing Check, the
Intruder Bearing is found to be 90° from the Selected Bearing. The
probable cause is that the: -
(a) upper antenna is selected when it should be the lower.
(b) TCAS is set to TA/RA Mode.
(c) Antenna Coax cables are incorrectly rotated.
(c) Antenna Coax cables are incorrectly rotated.
