Licensed Master Plumber: Backflow Practice Test

100 Questions | Total Attempts: 8123

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Backflow Quizzes & Trivia

Welcome people, here we have got you an ultimate practice test on essentials for being a Licensed Master Plumber. This test precisely focuses on the topic of Backflow. If you are an aspirant in this field and preparing for the final exam, then take this practice test, it will be of great help to put your knowledge on the test.


Questions and Answers
  • 1. 
    WHERE IS THE #2 TEST COCK OF A DOUBLE CHECK BACKFLOW PREVENTION ASSEMBLY LOCATED? 
    • A. 

      UPSTREAM OF SHUT-OFF VALVE #1

    • B. 

      UPSTREAM OF CHECK VALVE #1

    • C. 

      DOWNSTREAM OF SHUT-OFF VALVE #2

    • D. 

      DOWNSTREAM OF THE #2 CHECK VALVE

    • E. 

      BETWEEN #1 AND #2 CHECK VALVE

  • 2. 
    WATER CONTINUOUSLY LEAKING FROM TEST COCK #2 DURING A TEST PROCEDURE OF A PRESSURE VACUUM BREAKER ASSEMBLY IS  PROBABLY CAUSED BY A LEAKING: 
    • A. 

      AIR INLET VALVE

    • B. 

      TEST COCK #1

    • C. 

      INLET SHUT-OFF VALVE #1

    • D. 

      OUTLET SHUT-OFF VALVE #2

  • 3. 
    WHICH ARE 2 TYPES OF CROSS CONNECTIONS?
    • A. 

      POLLUTANT A CONTAMINANT

    • B. 

      BACKSIPHONAGE & BACKPRESSURE

    • C. 

      LOW & HIGH

    • D. 

      TOXIC &NON-TOXIC

    • E. 

      DIRECT & INDIRECT

  • 4. 
    • A. 

      THE AIR INLET VALVE

    • B. 

      THE BOTTOM OF THE INLET PIPING

    • C. 

      SHUT-OFF VALVE #2

    • D. 

      THE BOTTOM OF THE VALVE BODY

    • E. 

      THE BOTTOM OF THE DISCHARGE PIPING

  • 5. 
    WHERE WILL AN ATMOSPHERIC VACUUM BREAKER USUALLY BE INSTALLED? 
    • A. 

      IN A BOILER SYSTEM MAKE-UP LINE

    • B. 

      IN THE SERVICE CONNECTION TO A RESIDENCE

    • C. 

      IN THE SERVICE CONNECTION TO A CAR WASH

    • D. 

      IN A FIRE SPRINKLER SYSTEM

    • E. 

      IN NONE OF THE ABOVE

  • 6. 
    WHEN PROTECTED BY A PIPE APPLIED ATMOSPHERIC VACUUM BREAKER, A 2" INLET TO A TANK SHALL BE INSTALLED AT LEAST__________ ABOVE THE  FLOOD LEVEL OF THE TANK. 
    • A. 

      2"

    • B. 

      4"

    • C. 

      6"

    • D. 

      8"

    • E. 

      12"

  • 7. 
    WHAT IS THE SUGGESTED MINIMUM VERTICAL DISTANCE BETWEEN THE RELIEF VALVE DISCHARGE PORT OF A REDUCED PRESSURE PRINCIPLE BACKFLOW PREVENTER ASSEMBLY AND THE FLOOR PLANE? 
    • A. 

      6"

    • B. 

      12"

    • C. 

      18"

    • D. 

      24"

    • E. 

      30"

  • 8. 
    WHICH OF THE FOLLOWING IS NOT A TYPICAL TEST COCK ADAPTER FITTING SIZE? 
    • A. 

      1/8” x 1/4”

    • B. 

      ¼” x ¼”

    • C. 

      3/8" x ¼”

    • D. 

      ½” x ¼”

    • E. 

      3/4 X ¼”

  • 9. 
    WHEN PERFORMING A FIELD TEST OF A REDUCED PRESSURE PRINCIPLE BACKFLOW ASSEMBLY, THE #2 TEST COCK SHOULD BE: 
    • A. 

      FLUSHED 1ST

    • B. 

      NOT FLUSHED AT ALL

    • C. 

      FLUSHED WITH CAUTION TO PREVENT A PREMATURE RELIEF VALVE DISCHARGE

    • D. 

      PLUGGED

    • E. 

      FLUSHED LAST

  • 10. 
    THE RELIEF VALVE ON A REDUCED PRESSURE PRINCIPLE BACKFLOW PREVENTER REMAINS CLOSED DURING NORMAL OPERATION DUE TO: 
    • A. 

      SUPPLY SIDE PRESSURE

    • B. 

      THE RELIEF VALVE SPRING

    • C. 

      ZONE PRESSURE

    • D. 

      ALL OF THE ABOVE

  • 11. 
    "CONTAINMENT" PROTECTION": 
    • A. 

      PROTECTS ALL CONSUMERS ON A PUBLIC WATER SYSTEM

    • B. 

      OFFERS NO PROTECTION TO INDIVIDUALS WITHIN A FACILITY

    • C. 

      PREVENTS BACKSIPHONAGE ONLY

    • D. 

      ALL OF THE ABOVE

  • 12. 
    WHERE IS THE BEST LOCATION FOR THE INSTALLATION OF A BACKFLOW PREVENTION ASSEMBLY? 
    • A. 

      IN A PIT — PROVIDED IT HAS A COVER

    • B. 

      UNDERGROUND

    • C. 

      IN AN EASILY ACCESSIBLE LOCATION IN A HEATED BUILDING

    • D. 

      AT OR NEAR THE CEILING IN THE BASEMENT

  • 13. 
    A CERTIFIED TESTER MUST DESCRIBE THE PROPER APPLICATION OF A BACKFLOW PREVENTCN ASSEMBLY AND THEIR LIMITATIONS WITH RESPECT TO:   
    • A. 

      MINIMUM & MAXIMUM ASSEMBLY WORKING PRESSURE

    • B. 

      MINIMUM & MAXIMUM ASSEMBLY WORKING TEMPERATURE

    • C. 

      BACKFLOW & DEGREE OF HAZARD

    • D. 

      ALL OF THE ABOVE

    • E. 

      NONE OF THE ABOVE

  • 14. 
    A CERTIFIED TESTER MUST RECORD ALL THE FOLLOWING PHYSICAL IDENTIFICATION OF A BACKFLOW PREVENTION ASSEMBLY EXCEPT: 
    • A. 

      MANUFACTURER

    • B. 

      DEGREE OF HAZARD

    • C. 

      MODEL #

    • D. 

      SERIAL #

    • E. 

      LOCATION OF ASSEMBLY

  • 15. 
    THE FOLLOWING STATEMENT IS CORRECT IN REGARDS TO A PIPE APPLIED ATMOSPHERIC VACUUM BREAKER... 
    • A. 

      INCLUDES AN UPSTREAM SHUT-OFF VALVE

    • B. 

      INCLUDES A SPRING LOADED CHECK VALVE

    • C. 

      IS USED FOR LOW HAZARD PROTECTION ONLY

    • D. 

      INCLUDES A SPRING LOADED AIR INLET VALVE

    • E. 

      MUST BE USED FOR BACKSIPHONAGE PROTECTION ONLY

  • 16. 
    WHY MUST ADEQUATE CLEARANCE BE PROVIDED ABOVE A BACKFLOW PREVENTION  ASSEMBLY? 
    • A. 

      FOR THE OPERATION OF THE SHUT-OFF VALVES

    • B. 

      FOR MAINTENANCE & REPAIR

    • C. 

      FOR TESTING PURPOSES

    • D. 

      FOR VISUAL INSPECTION OF THE ASSEMBLY

    • E. 

      ALL OF THE ABOVE

  • 17. 
    TO CONVERT "FEET OF HEAD" TO PSI, YOU MUST. 
    • A. 

      MULTIPLY BY 1.5

    • B. 

      MULTIPLY BY 3.339

    • C. 

      MULTIPLY BY.433

    • D. 

      MULTIPLY BY 14.7

    • E. 

      MULTIPLY BY 144.

  • 18. 
    SCENARIO…………… A TESTER IS DOING A FIELD TEST ON A REDUCED PRESSURE PRINCIPLE BACKFLOW PREVENTER. DURING THE TEST, A LEAKING #2 CHECK VALVE IS FOUND. AFTER MAKING THE NECESSARY REPAIRS, WHAT IS THE NEXT STEP? 
    • A. 

      THE #2 CHECK VALVE SHOULD BE RETESTED

    • B. 

      THE ENTIRE ASSEMBLY SHOULD BE RETESTED

    • C. 

      THE RELIEF VALVE SHOULD BE RETESTED

    • D. 

      THE #1 CHECK VALVE SHOULD BE RETESTED

    • E. 

      THE ASSEMBLY IS APPROVED WITH NO RETESTING

  • 19. 
    WHAT IS THE PROBABLE CAUSE OF A RELIEF VALVE FAILING TO OPEN DURING A FIELD TEST ON A REDUCED PRESSURE PRINCIPLE BACKFLOW PREVENTER?   
    • A. 

      A LEAKING #1 SHUT-OFF VALVE

    • B. 

      LOW WATER SUPPLY PRESSURE

    • C. 

      AIR TRAPPED INSIDE THE RELIEF VALVE

    • D. 

      EXCESSIVE BACKPRESSURE

    • E. 

      A MALFUNCTION OF THE RELIEF VALVE MECHANISM

  • 20. 
    WHAT SHOULD YOU DO IF THE AIR INLET VALVE OF A PRESSURE VACUUM BREAKER ASSEMBLY WILL NOT SEAT? 
    • A. 

      THE AIR INLET VALVE SHOULD BE WIRED CLOSED

    • B. 

      REMOVE THE CHECK VALVE

    • C. 

      REPLACE THE CANOPY COVER

    • D. 

      INCREASE THE SUPPLY PRESSURE

    • E. 

      REMOVE THE AIR INLET VALVE

  • 21. 
    BACKSIPHONAGE CAN BE CAUSED BY AN UNDERSIZED WATER PIPE CARRYING WATER AT A HIGH VELOCITY DUE TO: 
    • A. 

      A VACUUM EFFECT

    • B. 

      A PIVOT EFFECT

    • C. 

      A VENTURI EFFECT

    • D. 

      A MARGINAL EFFECT

    • E. 

      A GRAVITY EFFECT

  • 22. 
    WHAT IS THE PRIMARY CAUSE OF THE REVERSAL OF FLOW OF WATER IN A PIPING SYSTEM? 
    • A. 

      THE LENGTH OF THE PIPING SYSTEM

    • B. 

      LOW FLOW CONDITIONS

    • C. 

      THE SIZE OF THE PIPE

    • D. 

      THE REVERSAL OF A PUMP

    • E. 

      THE LOSS OF PRESSURE IN THE SYSTEM

  • 23. 
    WHAT TYPE OF PROTECTION IS PROVIDED BY A BAROMETRIC LOOP? 
    • A. 

      BACKPRESSURE BACKFLOW

    • B. 

      AN ATMOSPHERIC BREAK

    • C. 

      BACKSIPHONAGE BACKFLOW

    • D. 

      BACKPRESSURE & BACKSIPHONAGE BACKFLOW

  • 24. 
    A REDUCED PRESSURE PRINCIPLE BACKFLOW PREVENTER IS NOT REQUIRED AT THE SERVICE CONNECTION OF THIS FACILITY... 
    • A. 

      A CAR WASH

    • B. 

      A SEWAGE TREATMENT PLANT

    • C. 

      A PLATING PLANT

    • D. 

      IN A SINGLE FAMILY DWELLING

    • E. 

      A HOSPITAL

  • 25. 
    THE PROPER INSTALLATION OF A PIPE APPLIED ATMOSPHERIC VACUUM BREAKER ON AN IRRIGATION SYSTEM PERMITS THE DOWNSTREAM PIPING TO BE ELEVATED ABOVE THE ATMOSPHERIC VACUUM BREAKER PROVIDED... 
    • A. 

      THERE ARE NO CONTROL VALVES DOWNSTREAM

    • B. 

      THE SPRINKLER HEADS ARE AT LEAST 6" BELOW THE AVB

    • C. 

      A HOSE BIBB IS INSTALLED DOWNSTREAM

    • D. 

      A SHUT-OFF VALVE IS INSTALLED DOWNSTREAM

    • E. 

      NEVER