5-62.
The gypsy head on an electro-
hydraulic winch is connected to
the shaft by what means?
1.
By adjusting the stroke of its
hydraulic pump
2.
By using a clutch
3.
By adjusting the clearance
between the friction surfaces
of its brake
4.
By regulating the operating
voltage of its ac motor
5-63.
If the hoisting cables should
break on one side of an electro-
hydraulic elevator, which of the
following devices will prevent the
elevator from falling?
1.
The guide rails
2.
The special control valves
3.
The mechanical locks
4.
The serrated safety shoes
5-64.
To prevent excessive pressure in
the oil feed lines of a lube oil
pump system, which of the
following types of valves should
be used?
1.
Governor
2.
Relief
3.
Throttle
4.
Reducing
5-65.
To get the desired temperature of
oil leaving a tube-in-shell type
of oil cooler, which of the
following cooling actions is
regulated?
1.
The oil flow
2.
The airflow
3.
The seawater flow
4.
The freshwater flow
5-66.
Under ideal conditions, what kind
of friction, if any, occurs when a
main shaft rotates in a properly
lubricated main journal bearing?
1.
Fluid
2.
Sliding
3.
Rolling
4.
None
5-67.
Mineral lubricating oils can
withstand the effects of high
temperature and high speeds better
than either animal or vegetable
oils.
1.
True
2.
False
5-68.
Main propulsion turbines and
reduction gears use which of the
following types of oil
lubrication?
1.
9110
2.
3290
3.
3190 TEP
4.
2190 TEP
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