WFSM - SET B (VOLUME 3) WITH
CORRECT SOLUTIONS
What are the positions of the pump control switch?
A.) HAND/OFF
B.) HAND/AUTO
C.) HAND/OFF/AUTO
D.) HAND/OFF/MANUAL - ANSWER-C.) HAND/OFF/AUTO
The graphic display on the type 3 pump control panel is a single line
A.) diagram of the electrical wiring
B.) diagram of the pump control system
C.) mechanical diagram of the type 2 system
D.) mechanical diagram of the type 3 system - ANSWER-D.) mechanical diagram of the
type 3 system
Most emergency service calls involve
A.) electrical shorts
B.) no fuel delivery
C.) minor leaks
D.) jammed valves - ANSWER-B.) no fuel delivery
The pump is running, but no fuel is delivered. What is your first step in diagnosing the
problem
A.) check the pump
B.) check all valves
C.) review the as-built drawing
D.) check the fuel storage tank - ANSWER-C.) Review the as-built drawing
In the modified Panera system, how many tanks are used for defueling aircraft?
A.) 1
B.) 3
C.) 5
D.) 7 - ANSWER-A.) 1
The u bend in the panel hydrant system pit defuel line
A.) allows the line to expand
B.) absorbs the hydronic shock
C.) keeps a portion of the Line and meter from draining
D.) provides a place for priming the pump - ANSWER-C.) keeps a portion of the line and
meter from draining
How many hydrant outlets are served by each Panero pit?
,A.) 1
B.) 2
C.) 3
D.) 4 - ANSWER-A.) 1
When operating normally what part of the 302AF fueling/defueling valve restricts the
flow of fuel in the control tubing and will not close
A.) ejector strainer
B.) control valve flow control
C.) pressure relief control (CRL)
D.) pressure reducing control (CRD) - ANSWER-D.) Pressure reducing control (CRD)
Which component closes the main valve of the 302AF refueling/defueling valve when
there is excess flow at the hydrant outlet?
A.) Pressure-reducing control (CRD)
B.) Pressure-differential shutoff (CDHS-3)
C.) Loading pressure-relief control (CRL)
D.) Control valve (CV) flow control - ANSWER-B.) pressure differential shutoff (CDHS-
3)
When the CDHS-3 on the 302AF fueling and defueling valve trips pressure in the
common supply line travels through the solenoid and goes
A.) directly to the refueling section of the valve
B.) directly to the diaphragm chamber of the auxiliary Hytrol valve
C.) through the CDHS-3 to the refueling section if the valve
D.) through the CDHS-3 to the auxiliary hytrol cover chamber valve - ANSWER-D.)
through the CDHS-3 to the auxiliary hytrol cover chamber valve
to remedy a leakage on the Philadelphia hydrant adapter, you may need to replace the
A.) coupling poppet
B.) vacuum breaker
C.) flange gasket
D.) solenoid - ANSWER-C.) flange gasket
How many manual valves are found in the lateral control pit of the Pritchard system?
A.) 1
B.) 2
C.) 3
D.) 4 - ANSWER-C.) 3
which lateral control pit component automatically cuts off the defuel pump when a
predetermined amount of inches of mercury is reached?
A.) solenoid control switch
B.) pump circuit breaker
C.) vacuum control switch
, D.) panel selector switch - ANSWER-C.) vacuum control switch
When the cover chamber pressure of the 90AF-8 refueling control valve is at least as
great as the inlet pressure, the valve will
A.) pulsate
B.) modulate
C.) open fully
D.) close tightly - ANSWER-D.) Close tightly
the primary purpose of the orifice plate on the 302AF fueling and defueling valve is to
create differential
A.) pressure to operate the pressure differential control(DCHS-2)
B.) pressure to operate the pressure differential shut-off (CDHS-3)
C.) flow to operate the CDHS-2
D.) flow to operate the CDHS-3 - ANSWER-B.) pressure to operate the CDHS-3
during refueling which 302AF fueling and defueling valve component hold the defuel
side of the main valve inlet closed?
A.) loading pressure relief control CRL
B.) pressure differential shutoff (CDHS-3)
C.) solenoid
D.) hytrol - ANSWER-C.) solenoid
which delivery pressure causes the fueling side of the 302AF fueling and defueling
valve to close when turning the adjusting screw on the loading pressure relief control
counterclockwise?
A.) 5 pounds per square inch (psi) above normal inlet pressure
B.) 5 psi above normal operating pressure (NOP)
C.) 10 psi above normal inlet pressure
D.) 10 psi above NOP - ANSWER-B.) 5 psi above normal operating pressure (NOP)
approximately how many second do you want it to take the fueling valve to open when
you adjust the control valve flow control on the 302AF?
A.) 10
B.) 20
C.) 30
D.) 40 - ANSWER-B.) 20
you can begin to properly calculate the differential pressure required to adjust the
pressure differential shutoff (CDHS-3) by identifying the
A.) upstream and downstream pressure
B.) upstream pressure and flow rate
C.) downstream pressure
D.) orifice plate bore size - ANSWER-D.) orifice plate bore size
CORRECT SOLUTIONS
What are the positions of the pump control switch?
A.) HAND/OFF
B.) HAND/AUTO
C.) HAND/OFF/AUTO
D.) HAND/OFF/MANUAL - ANSWER-C.) HAND/OFF/AUTO
The graphic display on the type 3 pump control panel is a single line
A.) diagram of the electrical wiring
B.) diagram of the pump control system
C.) mechanical diagram of the type 2 system
D.) mechanical diagram of the type 3 system - ANSWER-D.) mechanical diagram of the
type 3 system
Most emergency service calls involve
A.) electrical shorts
B.) no fuel delivery
C.) minor leaks
D.) jammed valves - ANSWER-B.) no fuel delivery
The pump is running, but no fuel is delivered. What is your first step in diagnosing the
problem
A.) check the pump
B.) check all valves
C.) review the as-built drawing
D.) check the fuel storage tank - ANSWER-C.) Review the as-built drawing
In the modified Panera system, how many tanks are used for defueling aircraft?
A.) 1
B.) 3
C.) 5
D.) 7 - ANSWER-A.) 1
The u bend in the panel hydrant system pit defuel line
A.) allows the line to expand
B.) absorbs the hydronic shock
C.) keeps a portion of the Line and meter from draining
D.) provides a place for priming the pump - ANSWER-C.) keeps a portion of the line and
meter from draining
How many hydrant outlets are served by each Panero pit?
,A.) 1
B.) 2
C.) 3
D.) 4 - ANSWER-A.) 1
When operating normally what part of the 302AF fueling/defueling valve restricts the
flow of fuel in the control tubing and will not close
A.) ejector strainer
B.) control valve flow control
C.) pressure relief control (CRL)
D.) pressure reducing control (CRD) - ANSWER-D.) Pressure reducing control (CRD)
Which component closes the main valve of the 302AF refueling/defueling valve when
there is excess flow at the hydrant outlet?
A.) Pressure-reducing control (CRD)
B.) Pressure-differential shutoff (CDHS-3)
C.) Loading pressure-relief control (CRL)
D.) Control valve (CV) flow control - ANSWER-B.) pressure differential shutoff (CDHS-
3)
When the CDHS-3 on the 302AF fueling and defueling valve trips pressure in the
common supply line travels through the solenoid and goes
A.) directly to the refueling section of the valve
B.) directly to the diaphragm chamber of the auxiliary Hytrol valve
C.) through the CDHS-3 to the refueling section if the valve
D.) through the CDHS-3 to the auxiliary hytrol cover chamber valve - ANSWER-D.)
through the CDHS-3 to the auxiliary hytrol cover chamber valve
to remedy a leakage on the Philadelphia hydrant adapter, you may need to replace the
A.) coupling poppet
B.) vacuum breaker
C.) flange gasket
D.) solenoid - ANSWER-C.) flange gasket
How many manual valves are found in the lateral control pit of the Pritchard system?
A.) 1
B.) 2
C.) 3
D.) 4 - ANSWER-C.) 3
which lateral control pit component automatically cuts off the defuel pump when a
predetermined amount of inches of mercury is reached?
A.) solenoid control switch
B.) pump circuit breaker
C.) vacuum control switch
, D.) panel selector switch - ANSWER-C.) vacuum control switch
When the cover chamber pressure of the 90AF-8 refueling control valve is at least as
great as the inlet pressure, the valve will
A.) pulsate
B.) modulate
C.) open fully
D.) close tightly - ANSWER-D.) Close tightly
the primary purpose of the orifice plate on the 302AF fueling and defueling valve is to
create differential
A.) pressure to operate the pressure differential control(DCHS-2)
B.) pressure to operate the pressure differential shut-off (CDHS-3)
C.) flow to operate the CDHS-2
D.) flow to operate the CDHS-3 - ANSWER-B.) pressure to operate the CDHS-3
during refueling which 302AF fueling and defueling valve component hold the defuel
side of the main valve inlet closed?
A.) loading pressure relief control CRL
B.) pressure differential shutoff (CDHS-3)
C.) solenoid
D.) hytrol - ANSWER-C.) solenoid
which delivery pressure causes the fueling side of the 302AF fueling and defueling
valve to close when turning the adjusting screw on the loading pressure relief control
counterclockwise?
A.) 5 pounds per square inch (psi) above normal inlet pressure
B.) 5 psi above normal operating pressure (NOP)
C.) 10 psi above normal inlet pressure
D.) 10 psi above NOP - ANSWER-B.) 5 psi above normal operating pressure (NOP)
approximately how many second do you want it to take the fueling valve to open when
you adjust the control valve flow control on the 302AF?
A.) 10
B.) 20
C.) 30
D.) 40 - ANSWER-B.) 20
you can begin to properly calculate the differential pressure required to adjust the
pressure differential shutoff (CDHS-3) by identifying the
A.) upstream and downstream pressure
B.) upstream pressure and flow rate
C.) downstream pressure
D.) orifice plate bore size - ANSWER-D.) orifice plate bore size
