BACKFLOW TEST QUESTIONS AND ANSWERS

BACKFLOW TEST QUESTIONS AND
ANSWERS



IT IS POSSIBLE FOR A PERFECT VACUUM AT SEA LEVEL TO RAISE WATER IN A
PIPE APPROXIMATELY _________ FEET. CORRECT ANSWERS 34

6. WHICH OF THE FOLLOWING CONDITIONS COULD RESULT IN WATER
CONTAMINATION THROUGH A CROSS-CONNECTION?
A) A VACUUM CREATED BY THE IMPROPER USE OF WATER HAMMER
ARRESTERS
B) THE USE OF SELF CLOSING LAVATORY FAUCETS
C) TURNING OFF SERVICE TO A MULTI-STORY BUILDING AND ALLOWING THE
WATER SUPPLY TO DRAIN
D) A VACUUM CREATED BY THE USE OF QUICK CLOSING VALVES ON THE
LOWER FLOORS OF A BUILDING EXCEEDING TEN (10) FLOORS IN HEIGHT
E) THE INSTALLATION OF WATER CONSERVING FIXTURES, INTO A BUILDING
DESIGNED PRIOR TO THEIR REQUIRED US CORRECT ANSWERS C) TURNING
OFF SERVICE TO A MULTI-STORY BUILDING AND ALLOWING THE WATER
SUPPLY TO DRAIN

THE VENTURI EFFECT STATES THAT WHEN THE WATER VELOCITY WITHIN THE
PIPE INCREASES, THE PRESSURE: CORRECT ANSWERS DECREASES

THE FEDERAL LAW PLACING RESPONSIBILITY FOR THE PROTECTION OF THE
PUBLIC WATER SUPPLY ON THE PURVEYOR OF WATER IS THE: CORRECT
ANSWERS SAFE DRINKING WATER ACT

HOW MANY INCHES MUST A PRESSURE TYPE VACUUM BREAKER ASSEMBLY
BE INSTALLED ABOVE ALL DOWNSTREAM PIPING CORRECT ANSWERS 12

THE TERM "APPROVED REDUCED PRESSURE PRINCIPLE ASSEMBLY", APPLIES
TO AN ASSEMBLY WITH TWO SHUT-OFF VALVES, FOUR TEST COCKS AND:
CORRECT ANSWERS TWO APPROVED CHECK VALVES AND A DIFFERENTIAL
PRESSURE RELIEF VALVE

UNDERSIZED WATER PIPING CARRYING WATER AT HIGH VELOCITY CAN
CAUSE BACKSIPHONAGE DUE TO: CORRECT ANSWERS THE ASPIRATOR
EFFECT

, AN AIR GAP SEPARATION IS MEASURED FROM THE OUTLET OF THE
DISCHARGE PIPE, TO THE: CORRECT ANSWERS FLOOD LEVEL RIM

THE TYPE OF PROTECTION REQUIRED FOR A CLOSED LOOP HEATING SYSTEM
CONTAINING CHEMICALS IS CORRECT ANSWERS REDUCED PRESSURE
PRINCIPLE ASSEMBLY

FOR CONTAINMENT PROTECTION IN A NON-HEALTH HAZARD SITUATION, THE
MINIMUM PROTECTION REQUIRED SHALL BE CORRECT ANSWERS DOUBLE
CHECK BACKFLOW PREVENTION ASSEMBLY

WATER CONTINUOUSLY LEAKING FROM TEST COCK #2 DURING A TEST
PROCEDURE OF A PRESSURE VACUUM BREAKER ASSEMBLY IS PROBABLY
CAUSED BY A LEAKING CORRECT ANSWERS INLET SHUT-OFF VALVE #1

WHAT IS THE PROBABLE CAUSE OF A RELIEF VALVE FAILING TO OPEN DURING
A FIELD TEST ON A REDUCED PRESSURE PRINCIPLE BACKFLOW PREVENTER?
CORRECT ANSWERS MALFUNCTION OF THE RELIEF VALVE MECHANISM

HOW MANY POUNDS OF PRESSURE PER SQUARE INCH ARE EXERTED AT THE
BASE OF A COLUMN OF WATER THAT IS TWO (2) FEET TALL CORRECT
ANSWERS 0.86
THE POTABLE WATER SUPPLY TO A URINAL EQUIPPED WITH A FLUSHOMETER
VALVE IS NORMALLY PROTECTED BY A(N):
A) REDUCED PRESSURE PRINCIPLE BACKFLOW PREVENTION ASSEMBLY
B) DOUBLE CHECK BACKFLOW PREVENTION ASSEMBLY
C) ATMOSPHERIC VACUUM BREAKER
D) DUAL CHECK VALVE TYPE BACKFLOW PREVENTER
E) PRESSURE VACUUM BREAKER ASSEMBLY CORRECT ANSWERS C)
ATMOSPHERIC VACUUM BREAKER

AN ABSOLUTE VACUUM AT SEA LEVEL CAN LIFT A COLUMN OF WATER A
MAXIMUM DISTANCE OF:
A) 2.3 FEET
B) 4.34 FEET
C) 14.7 FEET
D) 33.9 FEET
E) 8.33 FEET CORRECT ANSWERS D) 33.9 FEET

WHILE TESTING A REDUCED PRESSURE PRINCIPLE BACKFLOW ASSEMBLY, A
FLUCTUATION IN THE PRESSURE DIFFERENTIAL DURING A STATIC CONDITION
IS CAUSED BY:
A) RAPIDLY CHANGING SUPPLY PRESSURE
B) BACKPRESSURE BACKFLOW
C) LEAKING NUMBER ONE (1) CHECK VALVE
D) BACKSIPHONAGE BACKFLOW