Battery Temperature Monitor System in Aeroplane
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Questions and Answers

What is the source of power supplied to the essential AC and DC buses?

  • DC generator
  • AC generator
  • Three-phase 115-V AC at 400 Hz (correct)
  • Battery
  • In the event of power loss to the essential AC and DC main busbars, how is power supplied to the DC essential bus and AC ESS BUS?

  • By the battery via the static inverter and emergency bus supply contactor (correct)
  • By the DC ESS shed bus contactor
  • By the AC ESS shed bus contactor
  • By the voltage regulator
  • What isolates the AC ESS bus shed network in the battery-only configuration?

  • DC generator
  • Emergency bus supply contactor (correct)
  • AC generator
  • Three-phase 115-V AC at 400 Hz
  • What adjusts the field current in generators or alternators to maintain the required output voltage?

    <p>Voltage regulator</p> Signup and view all the answers

    When are the AC ESS shed bus and DC ESS shed bus shed respectively?

    <p>When CSM/G is supplied by the RAT hydraulic pump</p> Signup and view all the answers

    How is the battery connected to supply power to the AC ESS BUS and DC essential bus?

    <p>Through the static inverter and emergency bus supply contactor</p> Signup and view all the answers

    What does the disconnect mechanism do in the event of a transmission malfunction?

    <p>De-couples the input shaft from the input spline shaft</p> Signup and view all the answers

    How is reset accomplished for the disconnect mechanism with the engine stationary?

    <p>By pulling out on the reset handle until the solenoid snaps into position</p> Signup and view all the answers

    What is the main cooling agent used in newer AC generators?

    <p>Oil</p> Signup and view all the answers

    What is forced through older and/or less powerful generators as a cooling means?

    <p>Ram air</p> Signup and view all the answers

    What happens when the driving dogs on the two shafts are separated?

    <p>The input spline shaft spins freely in the transmission without causing rotation</p> Signup and view all the answers

    Which component sends oil through both the generator and an air/oil heat exchanger for cooling?

    <p>CSD</p> Signup and view all the answers

    What is the purpose of the battery temperature monitor system in aircraft with Ni-cad batteries?

    <p>To provide continuous temperature indication of the battery</p> Signup and view all the answers

    How many temperature sensors (thermistors) are present in each battery?

    <p>Two</p> Signup and view all the answers

    Where are the two independent temperature sensors (thermistors) mounted within the battery?

    <p>On the intercell connector link of the battery</p> Signup and view all the answers

    Why is adequate ventilation necessary for lead-acid batteries?

    <p>To remove hydrogen and oxygen gassing safely</p> Signup and view all the answers

    How can a positive airflow ventilation system be created for the battery compartment?

    <p>By using the aircraft's airstream with a pick-up and outflow pipe through the aircraft's skin</p> Signup and view all the answers

    What is the purpose of using a pick-up and outflow pipe through the aircraft's skin in relation to battery ventilation?

    <p>To safely remove gassing from lead acid batteries outside the aircraft</p> Signup and view all the answers

    What happens to the terminal voltage of the generator as it comes up to speed?

    <p>It rises</p> Signup and view all the answers

    When contact points C1 are separated, where does the field current flow through?

    <p>R1 and L2</p> Signup and view all the answers

    What effect does adding resistance to the field circuit have on the generator?

    <p>Decreases terminal voltage</p> Signup and view all the answers

    Why is L2 winding opposed to the L1 winding in the generator?

    <p>To neutralize the magnetic pull of L1</p> Signup and view all the answers

    What is the purpose of the vibrator-type current limiter in the generator system?

    <p>To limit output current automatically</p> Signup and view all the answers

    Where is L3 located in relation to the main line and load in the generator system?

    <p>In series with the load</p> Signup and view all the answers

    What is the reason vibrating-type regulators and three-unit regulators cannot be used with generators requiring high field current?

    <p>They may cause pitting or burning of contacts</p> Signup and view all the answers

    Why do heavy-duty generator systems require a different type of regulator, such as the carbon-pile voltage regulator?

    <p>To regulate the generator terminal voltage</p> Signup and view all the answers

    What feature distinguishes a compound-wound generator from other types of generators?

    <p>Presence of both series and shunt field windings</p> Signup and view all the answers

    What is the purpose of the radially arranged leaf springs in a carbon-pile voltage regulator?

    <p>To exert pressure against the contact plug</p> Signup and view all the answers

    In older aircraft DC generating systems, which type of regulator would typically be used?

    <p>Carbon-pile voltage regulator</p> Signup and view all the answers

    Why is a carbon pile named as such in the carbon-pile voltage regulator?

    <p>Because it consists of hard carbon and soft carbon discs in a stack</p> Signup and view all the answers

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