"Q" Tests- General Subjects Flashcards
(121 cards)
If both the shell-and-tube lube oil cooler and shell-and-tube jacket water cooler of a diesel engine are seawater cooled, what statement is true?
Seawater flows through the tubes of both the lube-oil and jacket-water coolers.
If a heat exchanger is designed to condense refrigerant vapor using central cooling fresh water as a condensing medium, what statement is true?
The refrigerant vapor loses latent heat, the central cooling fresh water gains sensible heat.
What type of flow pattern would be associated with a forced-convection finned-coil heat exchanger such as an air-cooled hydraulic oil cooler?
Cross flow
If a seawater-cooled shell-and-tube lubricating oil cooler has the seawater inlet and outlet connections on the opposite end water boxes, in terms of the number of passes, what statement is true?
The tube-side fluid flow pattern is single-pass.
The general purpose of a heat exchanger is to __________.
heat, or cool one fluid by means of another fluid
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
Item “B” shown in the illustrated hydraulic circuit is used to __________. GS-010
shut down the remotely operated electric motor driven pump when the watertight door has closed
Energy imparted to the hydraulic fluid in an operating hydraulic system is stored in the __________.
accumulator
The component which is used to thoroughly separate small, fine, dust-like particulate contamination from hydraulic fluid is a/an __________.
filter
Of the hydraulic tubing fittings illustrated, the flared fitting for high pressure use is represented by figure __________. GS-010
A or B
The portion of a hydraulic hose that determines its overall strength is the __________.
braided inner layer(s)
The discharge capacity of the axial piston hydraulic pump, shown in the illustration, is __________. GS-0058
fixed by the pump housing angle
To convert a vane type hydraulic pump to a hydraulic motor, which of the following would have to be done?
Provide small springs between the vanes and the base of the vane slots.
In a hydraulic system using the device illustrated, the high pressure return is provided by __________. GS-0118
A
Return lines in a non-pressurized hydraulic system reservoir should enter the tank well below the fluid surface level to __________.
prevent foaming
Which of the following direct-reading pressure gauges is capable of measuring and displaying both positive and negative pressures?
Compound gauge