5-21. 5-22. 5-23. 5-24. 5-25. 5-26. In how many directions will a check valve allow fluid to flow? 1. One 2.   Two 3. Three 4. Four What type of valve requires a 90-degree  turn  to  operate  the valve in either the completely open  or  closed  position? 1. Check  valve 2. Gate  valve 3. Ball  valve 4. Butterfly  valve If  a  constant-pressure  pump governor is attached to a gear pump, to which of the following parts  is  the  governor  connected? 1. The driving gear 2. The driven gear 3. The  suction  line 4. The  discharge  line You can close a butterfly valve by using  which  of  the  following procedures? 1. Depress a push button 2. Lift up on a handle 3. Turn the handle one-fourth turn 4. Turn the handle one-half turn Whether a stop-check valve acts as a stop valve or as a check valve is determined by which of the following  factors? 1. The  position  of  the  control lever 2. The direction of the flow 3. The type of disk installed 4. The position of the valve stem In  a  piping  system,  relief  valves automatically  open  when  what factor has been exceeded? 1. The  temperature 2. The  pressure 3. The flow 4. The circulation 5-27. Reducing valves in reduced pressure  systems  are  designed  to be used for which of the following purposes? 1. To prevent damage to the lines due  to  excessive  pressure 2. To  provide  a  steady  pressure lower than the supply pressure 3. To  vary  the  operating  pressure and  the  supply  pressure 4. Each of the above 5-28. Fuel oil suction may be taken from one  of  many  sources  and  discharged to another unit or units of the same group by what device? 1. Priority  valve 2. Globe  valve 3. Valve manifold 4. Operating lever A.   STEAM B. SEWAGE c. POTABLE  WATER D. HELIUM/OXYGEN Figure 5A IN  ANSWERING  QUESTIONS  5-29 THROUGH 5-31, REFER TO FIGURE 51 AND SELECT THE FLUID THAT CORRESPONDS  TO  THE  COLOR  CODE  FOR VALVE HANDWHEELS AND OPERATING LEVERS . 5-29. Gold. 1.   A 2.   B 3.   C 4.   D 5-30. Striped  buff/green. 1.   A 2.   B 3.   C 4.   D 27