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# 2A672

### Vol 1 & 2 Edit code 6

(001) What is the simplest form of matter? Element
(001) In an atom, what electrons contain the most energy? Valence electrons
(001) If there are eight electrons in the outer most shell of an atom, then it is considered... Stable
(001) Atoms having more than four electrons, but less than eight are known as... insulators
(001) The electrostatic fields around a positive ion move... outward
(001) The force required to move free electrons through a conductor is known as... voltage
(002) What are factors that affect the resistance of a material? Area, temperature, and type of material
(002) What is the resistance in a circuit if the power rating is 40 watts and total current is 2 amps? 10 ohms
(002) In a series-parallel circuit, find RT(total resistance)if series resistor R1=7ohms, and parallel resistors R2 and R3=8 ohms. 11 ohms
(002) In a series-parallel circuit, the series current at I1=9 amps; in the two parallel branches, I2=5 amps; and the value of I3 is not listed. Use Ohm's law to find the value of I3 and IT. I3=4 amps and IT=9 amps
(002) In a series parallel circuit, total voltage is 12 volts, the value of E1 in the series portion of the circuit is unknown. There are two parallel branches (E2=3 volts) and the value of E3 in the second parallel branch is unknown. Using Ohm's law, fi E3= 3 volts and E1= 9 volts
(002) What is the difference between an open and a short? No current flow in an open circuit; excessive current flow in a shorted component
(003) When voltage is induced into a conductor by a relative motion between the conductor and a magnetic field this principle is known as electromagnetic induction
(003) In an inductive circuit, what is meant by current lags voltage by 90 degrees? Current is maximum when voltage is zero; voltage is maximum when current is zero
(004) What is the basic principle of operation for transformers? Mutual induction
(004) What transformer winding acts as a conductor and provides the path into which the voltage is induced? Secondary
(005) If the size of the plates of a capacitor is increased, how is the capacitance affected? Capacitance increases
(005) What statement best describes a capacitive circuit? Current leads applied voltage by 90 degrees
(005) In what type of circuit(s) does a capacitor oppose any change in voltage? AC
(006) What statement best describes a diode? Has the ability to conduct in one direction and not the other
(006) What are the minority carriers in P-type material? Electrons
(007) The area of a semiconductor where P-type material is joined to N-type material is known as depletion region
(007) A junction diode has how many PN junction(s)? 1
(007) If a negative potential is connected to the cathode and a positive potential is connected to the anode of a PN junction, the diode is? forward biased
(008) In a circuit using a bridge rectifier, how many diodes are forward biased during the first cycle of alternating current (AC)? 2
(009) How is a zener diode connected in a circuit to regulate voltage? In parallel to the load
(009) How is the zener diode connected in a circuit to protect the load? In parallel to the load
(010) What is the primary use of a silicon-controlled rectifier( SCR)? Electronic switch
(010) The silicon-controlled rectifier (SCR) has how many layers? 4
(010) In order to turn off a silicon-controlled rectifier(SCR), the current must drop below the holding current
(011) What is the major difference between an NPN transistor and a PNP transistor? Direction of current flow
(011) If the arrow in a bipolar transistor is pointing away from the base, what type of transistor is it? NPN
(011) The most positive point in a PNP bipolar transistor is the emitter
(011) The circuit in the bipolar transistor that carries 5 percent of the current flow is the control circuit
(012) What happens if the emitter-base (E-B) current is increased in a transistor amplifier? Current increases through the E-C circuit
(013) What are the three leads in a unijunction transistor (UJT)? Emitter, base 1, and base 2
(013) The emitter in a unijunction transistor (UJT) always points toward the base 1 lead
(013) What controls the firing time of the unijunction transistor (UJT)? Resistance and capacitance in the circuit
(013) A metal oxide varistor (MOV) is made up of how many semiconductors? 2
(014) What component of the voltage regulator compensates for the losses in the power cable by sensing changes in current flow? Load rheostat
(014) The portion of the voltage regulator that supplies exciter field voltage is transformer (T1) and rectifier (CR26)
(015) FO 1: After performing an operational check of the A/M32A-86D generator set, you proceed to shut the unit down. After the generator stops, you notice the engine light continues to glow. What is the probable cause of the trouble? S48 closed
(015) FO1. During operation of the A/M32A-D generator set, you get no response when you place S13 in the GENERATE position. A check of voltage at J8, terminal N, shows 12 volts direct current(VDC). What is a probable cause of this trouble? S53 is open
(015) FO1. You are operating an A/M32A-86D generator set at governed speed, but voltage doesn't build up. What is a probable cause of this trouble? K23 contacts are open
(015) During operation of the A/M32A-86D generator set, what position do you place control switch S13 in to move the fuel rack and increase the engine speed to 2,000 RPM? AUTO TEST BANK
(015) FO1. During an operational check of the A/M32A-86D generator set, the shutdown solenoid energizes immediately after the engine run indicator illuminates. What is a probable cause of this trouble? S49 shorted
(015) FO1. During operation of the A/M32A-86D generator set, the low coolant light (DS50) illuminates, but the unit does not shut down. What is a probable cause of this trouble? A2
(016) What component controls the strength of the A/M32A-86D generator exciter field L2? Voltage regulator VR1
(016) What component on a A/M32A-86D generator is used to manually increase output voltage? Voltage rheostat R61
(016) FO1. Where is the best point to check voltage to the A/M32A-86D generator exciter field? J8, terminal D-F
(016) An A/M32A-86D is operating and the alternating current (AC) voltmeter is reading 200 volts alternating current (VAC) on all three phases. What do you do? Switch S15 to the L-N position
(016) FO1. An -86D generator is sent to the shop on a RedX for "will not apply power to aircraft". During Ops check, you place S5 in the closed position and the contractor light illuminates. When you release S5, the contact opens. What is a probable cause R46 is open
(017) What effect does a defective K4 relay have on the A/M32A-86D generator output circuit? K607 energizes and K1 de-energizes
(017) While operating an A/M32A-86D at governed speed, you place S13 in the build up position and the undervoltage light comes on. What is a probable cause of this trouble? Memory time delay relay
(017) You are driving on the flight line and notice an A/M32A-86D power unit with all the fault lights on. You try to reset S23, but the lights stay on. What is a probable cause of this trouble? S30 is shorted
(018) When troubleshooting any electrical system, you can locate a starting point by first finding the last know source of power
(018) Which step or troubleshooting is considered the most difficult? Analysis
(018) To test the load contractor relay K1, using test probes, in what position must the automatic manual voltage control switch be placed? AUTOMATIC
(019) What component on the B809A generator set fuel system distributes and delivers an accurate amount of fuel to the engine cylinders? Injector pump
(019) What B809A generator set speed control system component produces a frequency pulse train for engine speed reference? Magnetic pick-up
(020) What signal powers the regulator card output pulse sent to the exciter field of the B809A generator? 110 VDC
(020) What action occurs when the B809A generator set alternating current (AC) card senses an AC supply fault? AC contactor opens and generator output stops
(020) What condition is sensed by the direct current (DC) card on the B809A generator set? Overtemperature
(021) FO2. While operating B809A generator, what switch is closed to provide potential to the exciter field? S5, run/idle toggle switch
(021) FO2. During high voltage operation of the B809A generator set, what action occurs to prevent the direct current(DC) contactors from closing? HSR de-energizes
(022) If you have a loss of residual magnetism in the exciter field poles, what should you do? Field flash the generator
(023) What gas turbine engine component is specifically designed to break if the engine locks up? Torsion shaft
(023) During operation of a A/M32A-60A generator set, you noticed the exhaust gas temperature is excessively high. What is the probable cause of this trouble? Pneumatic thermostat
(024) What component of the A/M32A-60A gas turbine engine lubrication system prevents engine operation if oil pressure is too low? Oil pressure sequencing switch
(025) While operating the A/M32A-60A generator set, you turn the bleed air switch to ON and the engine speed drops to 98%. What is happening in the governor to bring engine speed up to 100%? Spring tension is greater than centrifugal force and the flyweights move inward closing the bypass port
(026) What section of the A/M32A-60A gas turbine engine load control valve controls the opening time? Rate control
(027) FO5. The A/M32A-60A generator set starts, but shuts down as soon as S7 is released. What is the probable cause of this trouble? K18 is de-energizing
(027) FO5. During operation of the A/M32A-60A, the engine rotates, but there is no combustion. What is the probable cause of this trouble? S11
(027) FO5. During operational check of theA/M32A-60A generator set, the unit runs up to 80% and the ready to load lights comes on. What do you check? Check to see if the 95 percent centrifugal switch (S14) is closed
(028) FO5. During operation of an A/M32A-60A, what happens if K25 is energized? The unit operates normally
(028) FO5. During operation of the A/M32A-60A, you close S3, but the alternating current (AC) contactor light does not come on. What is the probable cause of this trouble? K11 contacts C and D opened
(029) FO5. The direct current (DC) voltmeter on an A/M32A-60A fails to indicate during operation. What is the probable cause of this trouble? TR1 is defective
(030) When an A/M32A-60A generator is started, what component de-energizes at 95 percent? Ignition unit
(030) If the ignition control unit fails to operate on an A/M32A-60A during operation, what do you check? Oil pressure switch S11
(031) Apparent power is measured in kilo-volt-amperes (KVA)
(032) FO6. The alternating current (AC) cable is plugged into the A/M24T-8 load bank input panel and both blower motors are turning, but nothing happens when you turn the shock load switches on. What is the probable cause of this trouble? CR1 is malfunctioning
(032) FO6. After you connect an A/M32A-60A to the A/M24T-8 load bank, you notice one of the blower motors isn't working on the load bank. What is the probable cause of this trouble? CR2
(032) FO7. You are testing an alternating current (AC) generator and find B phase on the A/M24T-8 load bank isn't working. What is the probable cause of this trouble? S56
(032) FO6/7. If CB2 opens on an A/M24T-8 load bank, what effect does it have on load bank operation? Alternating current (AC) load selection switches (S15 through S20) won't work
(032) FO6/7. The alternating current(AC) voltmeter on an A/M24T-8A indicates 120 VAC and the panel lights are working, but nothing happens when you turn the load selector switches on. What is the probable cause of this trouble? K110 is open
(033) What is the operating voltage of the blower motor and control relays on an A/M24T-8 load bank? 28 VDC
(033) FO 6. You are testing a direct current (DC) generator and notice the panel lights and blower motor (B2) on the A/M24T-8 load bank are not working. Where would you start troubleshooting? K2
(033) FO6. On an A/M24T-8 load bank, CR2 supplies 28 VDC to operate the panel lights, the wind switch assembly, and the... Blower motor B2
(201) During operation of the EPU-6/E frequency converter it is determined that E and F pin voltage is not needed for the aircraft. The operator places the loop/bypass/28V to aircraft switch to what position? Bypass
(201) What components receive potential directly from the input auto transformer? SCR voltage regulator and phase sequence transformer
(202) What components on the EPU-6/E frequency converter must be inspected prior to use? Air inlets for blockage
(202) What is the minimum interval at which the input and output terminals of the EPU-6/E are inspected? Semiannually
(202) During operation of the EPU-6/E frequency converter the operator determines that there is an under voltage (UV) fault problem with the unit. What component could be malfunctioning? The analog board has failed
(202) During operation of the EPU-6/E frequency converter the operator determines that one phase voltage is lower than the other two phases. What could cause this malfunction? Loose push-on connector on the output filter capacitor
(203) What is the function of the deswirl ring on an A/M32A-95 gas turbine compressor? Smooth turbulent air flow
(203) What component on an A/M32A-95 gas turbine compressor isolates the second stage air from the operation of the first stage compressor? Interstage seal
(203) What A/M32A-95 gas turbine compressor engine component accelerates hot expanding gases and directs them into the nozzle ring? Torus assembly
(204) What prevents engine operation of an A/M32A-95 gas turbine compressor if oil pressure is low? Oil pressure switch
(204) What prevents over pressurization of the bearing cavity on an A/M32A-95 gas turbine compressor? Oil tank vent line
(204) The acceleration limiter valve on the A/M32A-95 gas turbine compressor operates a poppet valve to control fuel flow to the atomizer using control air pressure combined with... spring tension
(204) On an A/M32A-95 gas turbine compressor what chambers are pressurized when the butterfly valve is closed? 1, 3, and 4
(204) What component on the A/M32A-95 gas turbine compressor closes to complete the electrical circuit to the fuel solenoid and ignition unit? Oil pressure switch
(204) FO2. The A/M32A-95 runs put to 60 percent but the battery is not charging. What is the probable cause of this trouble? K3 de-energized and the contacts did not remain closed
(204) FO2. During an operational check of an A/M32A-95 gas turbine compressor, you place the air load switch S2 in the ON position. The butterfly valve starts to open at 95 percent. What do you check? TD2
(204) FO2. What component on an A/M32A-95 gas turbine compressor energizes SV4? Air load switch
(205) What preliminary set-up step, if skipped, would prevent the A/M32A-95 gas turbine compressor from starting? Open and secure the exhaust door
(205) Which switch on the A/M32A-95 gas turbine compressor starts the automatic starting cycle? Turbine Start switch
(205) FO2. The A/M32A-95 engine cranks but doesn't start. What is the probable cause of this trouble? SV1 coil is open
(206) While you are operating an MA-3D air conditioner, the output air temperature is too high, so you set the temperature control to maximum cooling. The temperature controller sends a signal to B7 which steps open to meter refrigerant into the evaporator
(206) The temperature controller on an MA-3D air conditioner opens the hot gas bypass valve if the suction pressure is too low so the boiling point of the refrigerant must be increased to increase the output air temperature
(206) What component on the MA-3D condition increases the ambient air temperature approximately 60 degrees Fahrenheit(F)? Blower
(206) The heat sink on the MA-3D... cools the ethylene glycol/water solution
(207) You place the MA-3D air conditioner SW1 in the START position, but the engine does not operate. What is the probable cause of this trouble? Override switch is not closed
(207) The engine on the MA-3D air conditioner is operating at 1250 revolutions per minute (RPM), but the blower clutch does not engage. What do you do? Nothing; this is normal operation. The blower clutch energizes at governed speed
(207) What component on the MA-3D air conditioner provides 24 volts alternating current (VAC) for operation of the temperature controller? Transformer rectifier (TR1)
(208) What does frosting of a refrigeration system line or component indicate? Blockage
(208) What type of refrigeration system leak occurs when the pressure within the system is less than atmospheric pressure? Inward leaks
(209) What is the function of the auxiliary air system on the self generating nitrogen servicing cart (SGNSC)? Provides low pressure air for pneumatic tools
(209) What components on the self generating nitrogen servicing cart (SGNSC) separate the nitrogen from the oxygen? ASM1, ASM2
(209) The nitrogen booster compressor on the self generating nitrogen servicing cart (SGNSC) operates hydraulically
(210) What causes the starter solenoid on the self generating nitrogen servicing cart (SGNSC) to disengage during normal operation? Alternator output
(210) What component determines the speed of the nitrogen booster compressor on the self generating nitrogen servicing cart (SGNSC)? Programmable logic controller (PLC) circuit
(211) A supervisor documents a noncommissioned officer's (NCO) saftey training on Air Force Form.. 55
(212) Who determines the length of time it is considered economically feasible to repair a piece of equipment? Item management and the equipment specialist
(212) If you have an aerospace ground equipment(AGE) unit that is overhauled, it is considered to be how old at the completion of the overhaul? 2 years
(212) To whom does the maintenance organization submit the Air Force Technical Order (AFTO) Form 375? MAJCOM HQ
Created by: lucabrasi

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