4-35.  Current  gasoline  engines  operate  at which  of  the  following  compression ratios? 1. Between 6:1 and 11:1 2. Between 11:1 and 12:5 3. Between 12:5 and 13:1 4. Between 13:1 and 14:5 4-36.  Current  diesel  engines  operate  at which  of  the  following  compression ratios? 1. Between 10:1 and 11:1 2. Between 11:1 and 12:1 3. Between 12:1 and 19:1 4. Between 19:1 and 20:5 4-37.  The  lubricating  system  of  an  engine delivers oil to the moving parts for which  of  the  following  purposes? 1. To reduce friction 2. To assist in keeping the parts cool 3. To prevent serious damage to engine parts 4. All of the above 4-38.  Most  diesel  and  gasoline  engines  are equipped  with  what  type  of  lubricating system? 1.  Splash 2. Pressure 3. Gravity feed 4.  Immersion 4-39. To carry away the excess heat produced in the engine cylinders, marine engines are equipped with what type of cooling  system? 1. Oil 2.  Water 3. Alcohol 4. Air 4-40. Which of the following types of starting systems are used in internal combustion  engines? 1.  Electric 2. Hydraulic 3. Compressed air 4. All of the above 4-41.  Electric  starting  systems  in  internal combustion engines use which of the following types of current? 1. Direct current 2.  Alternating  current 3.  Magnetic  current 4. All of the above 4-42. What are the two distinct circuits in the ignition system of a gasoline engine? 1. Alternating and direct 2.  Mechanical  and  electric 3.  Primary  and  secondary 4. Hot and cold 4-43.  Which  of  the  following  events  happens at the exact instant that a cylinder is due to fire in a gasoline engine? 1. The ignition breaker points open 2. The ignition breaker points close 3. Fuel is injected directly into the cylinder 4. The intake valve closes 4-44.  On  a  gasoline  engine,  the  distributor is connected to what circuit? 1.  Primary 2.  Secondary 3.  Low-voltage 4. Mechanical 4-45. In a gasoline engine, the high voltage that jumps the gap in the spark plugs comes from what source? 1. The battery 2. The generator 3. The starter 4. The ignition coil 4-46. In an operating gasoline engine system, which of the following happens when the breaker points open? 1. High voltage is produced in the primary  circuit 2. Low voltage is produced in the secondary  circuit 3. High voltage is produced in the secondary  circuit 4. Low voltage is produced in the generator  circuit 22