3-28. Under  which  of  the  following conditions  will  a  properly operating  engine  governor  fail  to have any control over a sudden increase in speed? 1. Injector  leakage  during operation 2. Sudden drawing of lube oil into the cylinders from the air box 3. Manifold  explosion  due  to excessive  accumulation  of  oil 4. Inoperative  cylinder  relief valve due to a stuck spring 3-29. Before  installing  a  new  blower  oil seal, what must you do to the oil seal first? 1. Wash it in a detergent 2. Spray  it  with  paraffin 3. Blow some air through it 4. Soak it in clean, light lube oil 3-30. What must you do to an improperly operating safety valve when it is removed from an engine cylinder? 1. Reset  the  spring  tension 2. Replace the shear pin 3. Machine and lap the valve 4. Replace it with a new one 3-31. If the exhaust ports of an engine become  clogged  during  operation, which  of  the  following  conditions is a possible result? 1. High  exhaust  temperatures 2. Overheating  of  the  engine 3. Popping  of  the  cylinder  safety valves 4. Each of the above 3-32. When  cleaning  the  cylinder  ports  of an engine, you can prevent carbon from  entering  the  cylinder  by performing  which  of  the  following actions? 1. Using a vacuum cleaner while brushing  off  the  carbon 2. Jacking the engine over to a position  that  the  piston  blocks the port 3. Covering the inside of the cylinder 4. Brushing  off  the  carbon  away from  the  cylinder  direction 3-33. What kind of noise will most likely be  coming  from  an  engine  operating with a broken engine part? 1. Rattling 2. Clicking 3. Pounding 4. Knocking 3-34. The color of the exhaust smoke of an engine can NOT be used as an aid in which of the following circumstances? 1. Troubleshooting 2. Testing  for  fuel  contamination 3. Determining  engine  performance 4. Determining  serious  engine troubles 3-35. An explosion may occur if a cigarette is lit near a storage battery because of the presence of 1. hydrogen  gas 2. carbon  monoxide 3. sulphuric  acid 4. gasoline  fumes 3-36. Failure of a gasoline engine starting motor to run may be caused by  corroded,  loose,  or  burned battery terminals. 1. True 2. False 20