5-21.
What person is responsible for
ensuring operator maintenance is
performed on quarry equipment?
1.
Operations chief
2.
Maintenance supervisor
3.
Maintenance field crew
4. Quarry supervisor
5-22.
What NAVFAC publication provides
guidelines for wearfacing equip-
ment parts?
1.
P-404
2.
P-433
3.
P-405
4.
P-300
5-23.
Putting off maintenance to satisfy
immediate production demands sets
a good precedence and increases
the life of the equipment.
1.
True
2.
False
5-24.
What is the NEC of a qualified
blaster?
1.
5710
2.
5709
3.
5708
4.
5707
Learning Objective: Recognize
the principles and methods of
crusher operations.
5-25.
What command directs the tasking
of crusher operations for an NMCB?
1.
NAVFACENGCOM
2.
NAVCHAPGRU
3.
COMSECOND/COMTHIRDNCB
4.
COMNCFNCB
5-26.
The classification of a crusher
plant is based on what factor?
5-27.
What is the function of the
heavy-duty apron type of feeder?
1.
Feeds material to the
secondary unit
2.
Sorts material before
feeding the secondary unit
3.
Feeds material to the primary
unit
4.
Sorts material before feeding
the primary unit
5-28.
What component of the primary unit
prescreens material that is
already down to the desired size?
1.
Vibrating screens
2.
Apron feeder
3.
Under crusher delivery
conveyer
4.
Vibrating grizzly
5-29.
In a rock crusher, what problem
occurs when two rocks interlock
and bridge the jaws open?
1.
Blocking
2.
Bridging
3.
Choking
4.
Packing
5-30.
What factor determines the
production setting for a dual
roll crusher?
1.
The shell combination
2.
The speed setting
3.
The spacing between the rolls
4.
The hydroset control pressure
5-31.
The fineness of the product being
produced by a hydrocone crusher is
adjusted by what action?
1.
By raising or lowering the
mantle
2.
By adjusting the feed spout
3.
By controlling the hydroset
pressure
4.
By adjusting the concave ring
1.
Capacity output
2.
Weight of crusher unit
3.
Size jaws
4.
Area displacement
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