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AEIS Chap 1 Mst Revision

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AEIS Chap 1 Mst Revision
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  AEIS   MST   Revision   Chapter   1   1.   On   the   aircraft,   the   battery   is   normally   charged   by    ____________________   a.   constant   voltage   method.   b.   either   constant   voltage   or   constant   current   method.   c.   constant   current   method   d.   neither   constant   voltage   nor   constant   current   method.   2.   Which   of    the   following   is   not   a   symptom   of    thermal   runaway?   a.   Current   surge.   b.   Violent   gassing.   c.   Boiling   electrolyte   d.   Melting   of    plates   and   casing.   3.   Which   of    the   following   is   used   to   determine   the   terminal   voltage   of    battery   cells   when   the   battery   is   under   load?   a.   Hydrometer   b.   High   rate   discharge   test   c.   Capacity   test   d.   Insulation   test   4.   For   a   charged   lead   acid   battery,   what   is   the   chemical   reaction   residue   at   the   positive   plate?   a.   Lead   peroxide   b.   Lead   sulphate   c.   Lead   d.   Sulphur   5.   For   a   discharged   lead   acid   battery,   what   is   the   chemical   reaction   residue   at   the   positive   plate?   a.   Lead   peroxide   b.   Lead   sulphate   c.   Lead   d.   Sulphur   6.   Which   of    the   following   is   not   the   principal   function   of    the   aircraft   batteries?   a.   To   maintain   the   d.c   system   voltage   throughout   flight.   b.   To   maintain   the   d.c   system   voltage   under   transient   conditions.   c.   To   supply   power   for   short   term   heavy   loads   when   generator   or   ground   power   is   not   available.   d.   To   supply   limited   amounts   of    power   to   essential   flight   instruments,   radio   communication   equipment   under   emergency   conditions.   7.   Which   of    the   following   statement   is   true   about   the   battery?   a.   To   convert   chemical   energy   into   electrical   energy.   b.   To   convert   mechanical   energy   into   electrical   energy.   c.   To   convert   electrical   energy   to   mechanical   energy.   d.   To   convert   electrical   energy   into   chemical   energy.   8.   What   is   the   function   of    a   storage   battery   during   normal   operation   of    aircraft?   a.   Generate   400   Hz.   AC   through   the   inverter.   b.   Power   all   indicators   in   cockpit   during   night   flight   c.   Use   as   auxiliary   power   when   generator   operation   is   not   satisfactory.   d.   Keep   ATC   communication   system   powered.   1   Modified   by   Seran    AEIS   MST   Revision   Chapter   1   9.   What   is   the   correct   construction   detail   of    a   24V   lead ‐ acid   battery?   a.   Consists   of    12   cells   in   series   b.   Consists   of    6   cells   in   series.   c.   Consists   of    12   cells   in   parallel.   d.   Consists   of    18   cells   in   parallel.   10.   What   should   be   the   change   in   specific   gravity   of    the   electrolyte   in   nickel ‐ cadmium   battery   from   fully   discharged   to   fully   charged   condition?   a.   1.240   to   1.260   b.   1.260   to   1.280   c.   1.280   to   1.30   d.   The   specific   gravity   does   not   indicate   the   state   of    charge   in   the   case   of    nickel ‐ cadmium   cell   11.   What   is   meant   by   useful   life   of    a   secondary   battery?   a.   It   is   equal   to   ampere ‐ hour.   b.   It   is   equal   to   number   of    charge ‐ discharge   cycles   times   ampere ‐ hour.   c.   It   is   equal   to   number   of    charge ‐ discharge   cycles   before   its   capacity   is   reduced   to   uneconomical   level.   d.   It   is   equal   to   the   number   of    years   of    operation   before   the   fully   charged   voltage   drops   to   90%   of    the   voltage   of    a   new   battery.   12.   How   to   measure   insulation   resistance   of    a   battery?   a.   Measure   between   positive   terminal   of    battery   and   metal   plate   that   is   in   contact   with   metal   fittings   of    the   battery   b.   Measure   between   negative   terminal   of    battery   and   metal   plate   that   is   in   contact   with   metal   fittings   of    the   battery   c.   Measure   between   shorted   positive   and   negative   terminals   of    battery   and   metal   plate   that   is   in   contact   with   metal   fittings   of    the   battery   d.   Measure   between   positive   terminal   of    battery   and   electrolyte   inside   battery.   13.   What   is   the   minimum   acceptable   insulation   resistance   for   an   aircraft   battery?   a.   Should   be   at   least   0.5   Mega   ohms.   b.   Should   be   greater   than   5   Mega   ohms.   c.   Should   be   at   least   5000   ohms.   d.   Should   be   greater   than   5   Giga   ohms.   14.   In   order   to   eliminate   cell   imbalance   in   Ni ‐ Cd   batteries,   we   should   completely   discharge   cells   and   recharge.   What   is   the   name   of    this   method?   a.   Capacity   reconditioning   method   b.   Constant   voltage   charging   method.   c.   Constant   current   charging   method.   d.   Power   charging   method.   1.   When   charging   current   is   applied   to   a   nickel ‐ cadmium   battery,   the   cells   emit   gas   only   a.   when   the   electrolyte   level   is   low.   b.   if    the   cells   are   defective.   c.   toward   the   end   of    the   charging   cycle.   d.   when   the   battery   casing   cracks.   2   Modified   by   Seran    AEIS   MST   Revision   Chapter   1   2.   What   part   of    a   nickel ‐ cadmium   cell   helps   to   prevent   thermal   runaway?   a.   The   separator.   b.   The   negative   plate.   c.   The   positive   plate.   d.   The   casing.   3.   If    the   insulation   resistance   of    a   lead/acid   battery   is   down,   it   indicates   a.   case   leakage.   b.   leakage   between   positive   and   negative   terminals.   c.   intercell   leakage.   d.   All   the   above   answers.   4.   The   electrolyte   level   of    a   ni ‐ cad   battery   a.   falls   during   charge.   b.   falls   during   discharge.   c.   rises   during   discharge.   d.   may   rise   or   fall   during   discharge.   5.   A   24V   40AH   battery   discharges   at   200mA.   How   long   will   it   last?   a.   400   hours.   b.   300   hours.   c.   200   hours.   d.   No   answer.   6.   The   internal   resistance   of    a   battery   off    load   compared   to   on   load   is   a.   the   same.   b.   increased.   c.   decreased.   d.   may   increase   or   decrease.   7.   When   the   temperature   of    the   electrolyte   in   a   battery   increases,   the   specfic   gravity   (SG)   a.   remains   the   same.   b.   goes   up.   c.   goes   down.   d.   may   go   up   or   down.   8.   The   electrolyte   in   a   nicad   battery   is   a.   potassium   hydroxide.   b.   nickel   hydroxide.   c.   cadmium   hydroxide.   d.   sodium   hydroxide   9.   Two   2   volt   10AH   cells   are   connected   in   series,   the   output   voltage   and   the   capacity   would   be   a.   4   volt   10   AH.   b.   4   volt   20   AH.   c.   2   volt,   20   AH.   d.   2   volt,   10AH.   3   Modified   by   Seran    AEIS   MST   Revision   Chapter   1   10.   What   is   the   ampere ‐ hour   rating   of    a   storage   battery   that   is   designed   to   deliver   45   amperes   for   2.5   hours?   a.   112.5   ampere ‐ hour.   b.   90.0   ampere ‐ hour.   c.   45.0   ampere ‐ hour.   d.   No   answer.   11.   Two   12V,   40   amp   hour   (Ah)   batteries   connected   in   parallel   will   produce   a.   24V,   80   Ah   b.   12V,   80   Ah   c.   24V,   40   Ah   d.   12V,   40Ah   12.   If    a   battery   has   got   low   internal   resistance,   then   the   a.   no   load   voltage   will   be   the   same   as   on   load   voltage.   b.   on   load   voltage   will   be   greater   than   no   load   voltage.   c.   no   load   voltage   will   be   greater   than   on   load   voltage.   d.   no   load   voltage   can   be   the   greater   or   less   than   on   load   voltage.   13.   Two   batteries   12V   and   40   Ah   each,   are   in   series.   What   is   the   total   capacity?   a.   12V,   80   Ah.   b.   24V,   40   Ah   c.   24V,   80Ah   d.   12V,   40Ah   14.   Which   of    the   following   is   most   likely   to   cause   thermal   runaway   in   a   nickel ‐ cadmium   battery?   a.   A   high   internal   resistance   condition.   b.   High   current   charging   of    the   battery   to   more   than   100   percent   of    its   capacity.   c.   Excessive   current   drawn   from   the   battery.   d.   High   terminal   voltage   of    the   battery.   15.   A   20   cell   battery   with   each   cell   having   an   internal   resistance   of    0.1   ohms   is   charged   with   2   leads   having   a   total   resistance   of    0.1   ohms.   The   battery   is   charged   with   a   current   of    5   amps.   What   is   the   charging   voltage?   a.   0.5V   b.   10.5V   c.   0.005V   d.   No   answer   16.   Two   10V,   20   Ah   batteries   are   connected   in   parallel   and   connected   across   a   10   ohm   load.   How   long   could   they   supply   normal   current   before   the   voltage   begins   to   decay?.   a.   40   hours   b.   20   hours   c.   4   hours   d.   No   answer.   4   Modified   by   Seran  
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