5-51.
At what temperature will R-12 boil
at atmospheric pressure?
1.
12°F
2.
0°F
3.
-12°F
4.
-21°F
5-52.
Which of the following fans is
generally preferred for exhaust
systems that handle explosive or
hot gases?
1.
Centrifugal
2.
Vane-axial
3.
Tube axial
5-53.
The vapor compression chilled
water circulating system differs
from a refrigerant circulating
air-conditioning system in what
way?
1.
Method of evaporation
2.
Method of compression
3.
Method of condensing
5-54.
Air compressors may be classified
according to
1.
make, model, and oil-free
discharge
2.
pressure, oil-free discharge,
and type of compressing
element
3.
pressure, model, and oil-free
discharge
4.
type of compressing element,
make, and model
5-55.
Which of the following prime
movers is directly connected to
the vertical, five-stage,
reciprocating high-pressure air
compressor?
1.
Steam turbine
2.
Diesel engine
3.
Electric motor
4.
Pneumatic turbine
5-56.
Medium-pressure air compressors
have a discharge pressure range
between
1.
51 and 100 psi
2.
101 and 150 psi
3.
151 and 1000 psi
4.
1001 and 1200 psi
5-57.
Dehydrators are used for which of
the following purposes?
1.
To compress air
2.
To cool compressed air
3.
To add moisture to compressed
air
4.
To remove moisture from
compressed air
5-58.
Condensed vapor that is produced
by a distilling plant is pumped to
which of the following locations?
1.
The firemain system
2.
The condensate system
3.
The ship’s freshwater tank
4.
The overboard discharge tank
5-59.
What is the purpose of the three
wings on the tubular-type oil
purifier?
1.
They keep the oil rotating at
the speed of the bowl
2.
They collect the sediment or
other impurities
3.
They separate the oil into
three layers
4.
They help accelerate the
rotation of the bowl
5-60.
The direction of fluid flow in the
electrohydraulic steering gears
depends on which of the following
factors?
1.
Hydraulic ram
2.
Tilt box angle
3.
Power unit
4.
Axial piston
5-61.
What component is used for heaving
in heavy mooring lines?
1.
Winches
2.
Windlasses
3.
Wild cats
4.
Whelps
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