1-54. Which  of  the  following  statements is NOT a true statement of fluid viscosity? 1. An  ideal  fluid  viscosity remains  constant  throughout temperature  changes 2. The  average  hydraulic  fluid has a relatively low viscosity 3. There is a large choice of liquids  available  for  the viscosity  range  required 4. Liquids  derived  from  the  same source  have  equal  resistance to heat 1-55. The  film  strength  and  lubricating qualities of a liquid are directly  related  to  the  liquid’s physical  properties. 1. True 2. False 1-56. Which  statement  about  a  hydraulic liquid  that  is  continuously subjected  to  high  temperature conditions  is  true? 1. It  accumulates  moisture 2. It  changes  unfavorably  in composition 3. Its life is unaffected by the hours of use 4. The  carbon  and  sludge  formed in it are of little concern if  the  reservoir  temperature remains  normal IN  QUESTIONS  1-57  THROUGH  1-59,  SELECT FROM COLUMN B THE DEFINITION OF EACH PROPERTY OF LIQUIDS LISTED IN COLUMN A. A.  Properties B.  Definitions 1-57. Fluidity 1. 1-58. Viscosity 1-59. Chemical stability 2. 3. 4. The internal resistance that tends to prevent liquids  from. flowing The quality, state, or degree of liquids being poisonous The physical property that enables liquids to flow The  ability of liquids to resist oxidation and deteriora- tion for long periods 1-60. The  desirable  flashpoint  of  a hydraulic  liquid  is  one  which provides  a 1. low  degree  of  evaporation  and good  resistance  to  combustion 2. high  degree  of  evaporation and  poor  resistance  to combustion 3. low degree of evaporation and low  resistance  to  combustion 4. high  degree  of  evaporation and  high  resistance  to combustion 1-61. Hydraulic  liquid  must  possess which  of  the  following properties? 1. Chemical  stability  and freedom  from  acidity 2. Lubricating  ability  and proper  viscosity 3. Minimum  toxicity  and  high flashpoint 4. All of the above 7