4-34. 4-35. 4-36. 4-37. Learning  Objective: Recognize the types of fluid power actuating  devices  and  identify construction  features,  uses,  and operating  characteristics  of various  types  of  actuating cylinders. What  component  of  a  fluid  power system  converts  fluid  power  into mechanical  force  and  motion? 1. Pump 2. Valve 3. Actuator 4. Solenoid What  actuating  devices  are commonly used in fluid power systems? 1. Turbines 2. Motors 3. Cylinders 4. All of the above A cylinder is   identified as a ram type if its 1. piston rod diameter is less than one-half of the diameter of the piston 2. piston rod area is less than On-half the area of it 3. area is more than one-half of the area of the piston rod 4. piston  rod  cross-sectional area exceeds one-half of the cross-sectional  area  of  the piston Ram-type  sinqle-acting  cylinders are designed for which type of functions? 1. Push  functions  where  springs assist  the  functions 2. Pull  functions  where  springs assist  the  functions 3. Push  functions  where  return action depends on springs or gravity 4. Pull  functions  where  return action depends on springs or gravity 4-38. 4-39. Four-way  control  valves  are normally used to control the actions of the 1. single–acting  ram 2. double-acting  ram 3. sinqle-acting  ram  through  two ports 4. double–acting  ram  using  equal pressure on all valve surfaces Refer to figure 10-2 of your textbook. Why  does  the  extension stroke  exert  a  greater  force  than the  retraction  stroke? 1. The  pressure  is  much  greater for the extension stroke 2. The bottom of the ram has a larger surface area than the lip 3. Both  pressure  and  surface area are greater for the extension  stroke 4. The extension stroke is usually  assisted  by  gravity IN QUESTIONS 4-40 THROUGH 4-42 SELECT FROM COLUMN B AN APPLICATON OF EACH TYPE  OF  ACTUATING  CYLINDER  LISTED  IN COLUMN  A. A.  CYLINDER  TYPES B.  APPLICATIONS 4-40. Sinqle–acting. 1. Dump trucks spring-loaded piston 2. Ships’ steer. ing systems 4-41. Telescoping  ram 3. Anchor wind- 4-42. Dual ram lass 4. Carrier air- craft arrest- ing hooks 4-43. The piston-type cylinder has a cross-sectional  area  that measures more than twice the cross-sectional area of its piston  rod. 1. True 2. False 28