Flashcards
Memorize material
What material are the plates of a wet cell NiCad storage battery made of?
nickel hydroxide and cadmium oxide
The best tool to use to measure the number of threads per inch on a bolt is a __________.
screw pitch gauge
If the cutting edges of a drill are ground at different angles, the __________.
hole will be oversized
Accidental flooding of the engine room bilges through the bilge system is prevented by __________.
stop-check valves installed in the bilge suction manifolds
With regard to the number of passes through the tubes of shell-and-tube heat exchangers, what statement is true?
In two-pass and four-pass heat exchangers, the inlet and outlet tube-side fluid connections are at the same end.
In accordance with 33 CFR Subchapter O (Pollution), which type of Marine Sanitation Device (MSD) is used solely for the storage of sewage and flush water at ambient air pressure and temperature?
Type III
Which characteristic or condition will have the greatest effect on increasing a hydraulic oil’s viscosity?
Pressure
The term, whole depth of the gear, shown in the illustration, is equal to __________. Illustration GS- 0111
C+D
A thermal-magnetic circuit breaker for a 300 kW alternator is rated at 500 amperes at full continuous load. Which of the following conditions will trip the breaker?
Instantaneous current draw of 5,000 amperes.
Which of the illustrated motors has an open, drip-proof (ODP) motor enclosure? Illustration EL-0001
C
With respect to shaft bearing load absorption capability in terms of direction, what is meant by an axial load?
An axial load is a load applied parallel to the axis of the shaft.
Which of the following illustrations represents the proper method of circuit grounding for a low level analog signal cable? Illustration EL-0124
A
How would the pressure setting of the illustrated self-contained, internal-pilot, piston-operated steam pressure-reducer be reduced to a lower set point? Illustration GS-0044
The adjusting spring would need to have its compression load reduced by rotating the adjusting screw counter-clockwise further out of the adjusting spring chamber.
What statement is true with regard to the basic operating principle of gravity associated with an oily- water separator?
The density of oil is less than that of water and as a result the oil droplets in an oily-water mixture will tend to rise.
Referring to the illustrated motor ship fresh water cooling system drawing, which set of cooling water pumps, would MOST likely require a priming maintenance system or the use of deep-well pumps? Illustration MP-CW-06
The main engine piston cooling fresh water pumps.
An electric propulsion drive system in which the propulsion generator supplies power to both the propulsion motor and ship service loads is referred to as what type of system?
an integrated system
What class of screw thread is indicated with a machine screw described as 1/2-13 NC-2?
2
With an increase in temperature, the volume of hydraulic fluid __________.
increases
What is the name of the type of motor control circuit that will not permit automatic restarting after power is restored, following a power failure?
low voltage protection
The shaft sleeve for the pump shown in the illustration is identified by which item number? Illustration GS-0143
14
What does the symbol in figure “1” shown in the illustration represent? Illustration EL-0065
PNP bipolar junction transistor
Which of the following statements is true concerning the operation of the device shown in the illustration? Illustration GS-0116
Item “N” moves as the rudder stock rotates.
Which line in figure “B” shown in the illustration represents the trailing edge of the wave? Illustration EL-0088
4
What is the circuit shown in the illustration used to measure? Illustration EL-0024
resistance
The gas that exists in the stratosphere forming a protective shield that helps to protect the environment from the harmful effects of ultraviolet radiation is called what?
ozone
What is meant by the term “dead band” as it applies to prime mover speed control governors?
Dead band is the change in speed required before the governor will initiate a corrective action as the result of a load change.
Which of the following propulsor types represents the proper terminology for a Kort nozzle?
Ducted propellers
Suppose the pilot pressure is from 3 to 15 psig for the illustrated pneumatically operated, diaphragm actuated control valve. Assuming the control valve is trimmed for a linear response and the travel position indicator is calibrated in percentage, what would be the approximate pilot pressure if the position indicator showed the valve to be 75% open? Illustration GS-0051
6.0 psig
What is the correct color-coding of refrigerant recovery cylinders regardless of the refrigerant contained within?
yellow top and gray body
Which of the listed temperature sensors is made of heat-treated metallic oxides and generally has a negative coefficient of resistance?
Thermistor
What type of disinfection system has the disadvantage that it would fail to provide residual disinfectant in the potable water?
An ultraviolet irradiator at the desalinator discharge to the potable water storage tank.
A metal scribe commonly found on a combination square measuring tool should only be used to __________.
mark on metal
A grinding wheel is trued with a __________.
dressing tool
Which statement is TRUE concerning electric propulsion drives?
The propeller speed and direction of rotation are easily controllable.
Assuming that the electrolyte has had sufficient time to be uniformly diffused throughout the cell, if the open-circuit cell voltage as measured by a digital multimeter is 2.12, what would be the approximate specific gravity?
1.280
If an air compressor is fitted with a hand-off-auto (H-O-A) control station, what statement concerning operation is true?
In the hand mode, the compressor will run continuously with unloading.
Which statement is true concerning alkaline reserve as it applies to a lubricating oil?
Alkaline reserve represents the ability of an oil to neutralize acids as they are formed.
The fluid used as a source of actuating power against the underside of the unloader power element piston of the refrigeration compressor capacity control mechanism illustrated is obtained from where? Illustration GS-RA-13
discharge of the compressor lube oil pump
The baffle plate used in the reservoir of a hydraulic system serves to __________.
o (A) minimize the amount of contamination deposited from return lines entering the system o (B) reduce fluid turbulence at the pump suction
o (C) minimize the entrance of entrained air through the pump inlet line
• (D) all of the above
Refrigerant flow through a thermostatic expansion valve is greatest under what conditions?
when the evaporator has just begun feeding at relatively high box temperature
In the illustrated refrigeration system, what is the proper name for the component labeled “A”? Illustration GS-RA-12
compressor
The rudder torque capacity of the four ram steering gear illustrated is rated at 44,210,000 inch- pounds with one power unit in operation. If the four ram system was able to be operated as a two ram system with both power units on line, what would be the available torque? Illustration GS-0067
22,105,000 inch-pounds
Spring reinforced oil seals are generally installed with the tail or lip of the seal facing __________. Illustration GS-0152
toward the oil pressure being sealed
What is one benefit of maintenance of proper air circulation in an air conditioned cargo space?
reduced slime and mold
Four lamps are connected in series in a single circuit. If one of the lamps burns out, what will happen to the other lamps?
all go out
As shown in the illustration, if figure “21” indicates the “TOP VIEW” of an orthographic projection, and figure “11” indicates the “FRONT VIEW”, which figure would best represent the correct “RIGHT SIDE VIEW”? Illustration GS-0165
Figure “10”
Which of the following statements is true concerning circuits with parallel connected resistances?
The total current flow equals the sum of the individual currents.
What is the physical state and pressure condition of refrigerant as it leaves a receiver in a typical refrigeration system?
high-pressure liquid
Which of the following liquid level sensors would be most suitable for measuring the liquid level in a pressure vessel, such as a water-tube boiler steam drum?
Differential pressure sensor
The amount of HCFC-123 in a storage cylinder is measured by what means?
weight
Pressure in an operating hydraulic system is developed __________.
by resistance to the fluid flow through the system
In the system illustrated, which of the following readings should be indicated on the pressure gage, if the load (x) is 8000 lbs (3632 kg) and the piston area (y) is 10 sq. in (64.5 sq. cm)? GS-0062
800 psi (56.31 kg/cm2)
Which characteristic or condition will have the greatest effect on increasing a hydraulic oil’s viscosity?
Pressure
The by-products of oxidation, as a result of water contamination of hydraulic oil, are generally __________.
gums, varnishes, and acids
Energy losses occurring in a hydraulic system are ultimately absorbed by the __________.
atmosphere as heat
The illustrated hydraulic pump graphic symbol is used to depict a __________. GS-0098
combined, pump unit
An arrow superimposed on a hydraulic graphic symbol at approximately 45°, as shown in the illustrated figures A, B, and C, indicates the component __________. GS-0068
can be adjusted or varied
Item “F” shown in the illustration represents two hydraulic pumps that are __________. GS-0103
manually operated with one located in the engine room and the other in the shaft alley of the water tight door
The illustrated hydraulic pump graphic symbol is used to depict a/an __________. GS- 0097
double pump unit
