ASSIGNMENT  7 Textbook  Assignment: "Aircraft  Avionics,"  chapter  7,  pages  7-1  through  7-21. 7-1. What  is  an  aircraft's  first  source  of  electrical energy? 1. Battery 2. Generator 3. Emergency  generator 7-2. Which of the following statements is NOT true concerning  aircraft  batteries? 1. It   is   important   to   keep   their   weight   to   a minimum 2. They  require  a  great  deal  of  care 3. They  usually  have  a  large  capacity 4. They  are  usually  enclosed  in  a  grounded, metal-covered  housing 7-3. The  positive  plates  of  a  lead-acid  battery  are made  of  what  material? 1. Lead  peroxide 2. Spongy  lead 3. Sulfuric  acid  fiber 4. Water  impregnated  composite 7-4.     Where does the nickel-cadmium battery get its name  from? 1. The  composition  of  its  plates 2. The  type  of  electrolyte  in  the  case 3. The  construction  of  the  terminal  post 4. The  rectangular  type  cells 7-5. What is the principal hazard in connection with the  use  of  lead-acid  batteries? 1. Fire 2. Explosion 3. Suffocation 4. Acid  burns 7-6. The manufacturer determines the correct charging  rates  for  aircraft  batteries. 1. True 2. False 7-7. What    does    the    term    "thermal  runaway"    in- dicate  concerning  aircraft  batteries? 1. The  battery  has  been  overcharged 2. The  battery  has  been  rapidly  cooled 3. The battery is internally shorted because of overheating 4. The  battery  has  been  totally  discharged 7-8. CO₂   should NEVER be sprayed in the aircraft battery compartment to effect cooling or displace  explosive  gases. 1. True 2. False 7-9. What  is  the  purpose  of  rectifiers? 1. Converts  ac  to  dc 2. Converts  dc  to  ac 3. Converts  mechanical  to  electrical  energy 4. Converts  electrical  to  mechanical  energy 7-10. Emergency power generators are used to provide power when the engine-driven generators  fail. 1. True 2. False 7-11. Auxiliary power units are used to furnish electrical  power  when  which  of  the  following problems  occur? 1. Engine-driven generators are not operating 2. External  power  is  not  available 3. The  engine-driven  generator  fails 4. Each  of  the  above 7-12. What  rating  maintains  the  pitot-static  system? 1. AT 2. AE 3. AX 4. AQ 7-13. What  three  aircraft  instruments  operate  off  of the  pitot-static  system? 1. Airspeed indicator, engine rpm, and altimeter 2. Rate-of-climb   indicator,   airspeed   indica- tor,  and  altimeter 3. Engine oil indicator, engine rpm, and compressor  speed  indicator 4. Oxygen, air-conditioning, and heating systems  instruments 7-14. What   does   the   air   speed   indicator   interpret from  the  pitot  tube? 1. Altitude 2. Air  density 3. Air  flow 4. Air  pressure 7-23