Oilers/Plant Tenders (HHC) Civil Service Exam
Oilers/Plant Tenders (HHC) Civil Service Exam
The texture of an aluminum-soap lubricating grease is
... [Show More] _________
Stringy
The property of a lubricant the allows it to adhere to metallic surfaces is known as ________
Oiliness
The physical appearance of a grease with a consistency number of four is MOST NEARLY _________
Hard
The one of the following measures that is commonly used to represent a rate of oil feed is drops per ________
Minute
The MOST important single property of a lubricating oil is its __________
Viscosity
The rate of change in viscosity of a petroleum oil with its temperature is indicated by its __________
Viscosity Index
The neutralization number of an oil is an indication of its __________
Organic or Mineral Acidity
Graphite is a form of __________
Anthracite Coal
The BASIC ingredient in the manufacture of lubricating greases is __________
Soap
A test of grease that identifies greases and indicates uniformity in their manufacture is known as the __________ test.
Dropping-Point
The bearing materials usually called "white metals" or Babbit metal consist MAINLY of __________
Tin and Copper
It is GOOD practice in the installation of three new packing rings in a stuffing box to require that the joints of the packing be spaced __________ degrees apart.
120
The objective in the use of applicaors for wire-rope lubrication is to apply a smooth even film at a temperature conducive to the __________
Penetration of the wire strands
The one of the following metals that is non-ferrous is __________
Copper
The common terms "heavy" and "light", applied to an oil, refer ONLY to the oil's __________
Viscosity
The ring in ring-oiled bearings has a diameter that is USUALLY __________ the journal the diameter.
Twice
A boiler feedwater regulator automatically controls the __________ the boiler.
Water Supply to
The dirty oil to be purified in an operating DeLaval Purifier enters the purifier bowl from the __________
Top of the machine
The APPROXIMATE ropm of a Sharpies oil purifier is __________
16,000
In order to have effective separation of purification in a Delaval Purifier, it is recommended that the oil to be cleaned be heated to an APPROXIAMTE temperature of __________
160 degrees F
The one of the following that is NOT a method for removing contaminants from oil is __________
Centripeting
An engine indicator is an instrument that is used on a reciprocating engine to determine the __________ the engine.
Performance of
The MAXIMUM bearing oil discharge temperature at which a turbine beating may satisfactorily operate is __________
200 degrees F
Generally, at which point should a turbine-driven generator, with an integral lubricating oil system, put the lube oil cooler in operation?
When the temperature of the hottest bearing reaches 100 degrees F
In modern practice, the method by which turbine-generator reduction gear surfaces NORMALLY recieve lubrication oil is __________
Pressure Circulation Lubrication
Lubrication for modern reciprocation air compressors is GENERALLY supplied by __________
A Mechanical Force-Feed Oiler
Aftercoolers are put on MOST air compressor installations to __________
Condense Moisture from Compressed Air
A pipe fitting having a male thread at one end, a female thread at the other end, and shaped to a ninety-degree bend is called a(n) __________
Street Elbow
The one of the following actions that MUST be taken during normal operation to clean a knife edge (cuneo) strainer is __________
Rotating the Cleaner Blades
Detergents are used in lubricating oils to __________
Keep Insoluble Matter in Suspension
The purpose of adding an inhibitor to lubricating oil is to __________ the engine.
Prevent Sludge and Varnish Formation on Parts of
The relationship between lubricating oil viscosities and temperature is that the viscosities
Decrease with a Temperature Increase
The ons of the following fluids that should be used when cleaning filter bags pressure-type lube oil filters is __________
Kerosene
The precaution, or precautions, that an oiler must take when he is using absorbent type lubricating oil filters is to __________
Make Sure that the Particular Oil Additives are not Removed by the Filter
The specific gravity of lubricating oil is USUALLY measured by means of a __________
Hydrometer
Of the following, the MOST important requirement of a refrigerator lubricant is that it have __________
Freedom from Water
The one of the following faults that would MOST generally cause a sudden increase in oil pressure in a lubricating line to a bearing is __________
A Clogged Strainer
The wick used in a gravity oil-feed system is USUALLY made of __________
Wool
A thrust bearing is LEAST likely to be fond on a(n) __________
Reciprocating Pump
A valve that allows oil to flow in one direction only is GENERALLY called a __________ valve.
Check
The one of the following types of oils MOST preferred for the hydraulic govenor of a reciprocating steam engine is __________ oil.
Non-Additive Turbine Type
The one of the following pumps that does NOT have moving parts to be lubricated is a __________ pump.
Jet
The LARGEST class of lubricants in common use is __________
Mineral Oil
The sealing fluid in lubricating oil centrifuges is __________
Water
In a well-operated lubricating oil and grease storage facility, lubricating oil is NOT normally removed from large drums by __________
Siphoning out of the Top of the Drum
The one of the following that os NOT the identification of a type of gear is a __________ gear.
Needle
The one of the following that is NOT an anti-friction bearing is the __________ bearing.
Helical
There are five belts in the drive of a certain fan unit. One of the belts is very loose. The PROPER action to take to correct this condition is to __________
Replace all belts with new belts
The one of the following activities that need NOT be performed before starting a forced draft fan unit has been shut down for some time is to __________
Open up the suction air valve
The oil at the bearing surface of a steam turbine is USUALLY hotter than the bearing oil discharge temperature by __________ degreees F.
50 to 80
General experience indicates that the lubricating oil temperature for the bearings of steam turbines should NOT be permitted to go above __________ degrees F.
110 to 120
The FIRST step in determining the reason why the bearings of a ventilating fan are "running hot" is to __________
Shut down the unit
AGMA Grade 1 lubricant is MOST NEARLY equivalent to SAE number __________
75
The letters AGMA, used when referring to a gear lubricant, are an abbreviation for the __________
American Gear Manufacturers Association
When the ignition charachteristics of a fuel are represented by a cetane number, the fuel is NORMALLY used in a __________
Diesel engine
The resistance to flow of aliquid is measured by a(n) __________
Viscosimeter
The MOST economical and effective method to get lubricating oil into a horizontal superheated steam reciprocating engine is to __________
Atomize the oil into the steam at the steam inlet
The parts of the valve in the poppet valve engine that require lubrication are the __________ guide.
Cam and tappet mechanism and the valve steam
The purpose of the seals that close the small openings between shafts in machinery, and the housings through which they extend, is to __________
Exclude dirt and prevent the escape of lubricant
Lubricants in a diesel engine perform all of the following functions EXCEPT __________
Acting as a vibration absorber
The one of the following signs that would indicate that the oil supply passage to a hydraulic lifter on a diesel engine is plugged up is __________
Noise from the affected valve
A pyrometer on a diesel engine is used for measuring __________
Temperature
Water GENERALLY enters a diesel lubricating oil system because of __________
Condensation of combustion products
Two gears are meshed together and have a gear ratio of 6 to 1. If the small gear rotates 120 revolutions per minute, the large gear rotates at __________ rpm.
20
The vacuum side of a compound gage reads 14 inches of vacuum. The barometer reading is 29.76 inches of mercury. The equivalent absolute pressure of the compund gage reading, in inches of mercury, is MOST likely __________
15.76
The fraction 5/8, expressed as a decimal , is __________
0.625
If 300 feet of a certain size pope weighs 450 pounds, the number of pounds that 100 feet will weigh is _________
150
As an oiler, you work for a facility that has automobiles that use, on the average, 600 quarts of one grade of lubricating oil every month. The number of one-gallon cans of the above oil that SHOULD be ordered each month to meet this requirement is __________
150
The purpose of a fuse in an electric circuit operating at a set voltage is to protect against __________
Too much current
A fuse in an electric circuit has the SAME function as a __________
Circuit breaker
Electric current is measured in __________
Amperes
Of the following, the one that is a good surface color for the commutators and slip ringsof electricla generators is _________
Chocalate brown
The type of fire extinguisher that SHOULD be used in fighting an electrical fire is __________
Carbon Dioxide
The MOST important precaution to take in giving first aid to a severely injured man when there is a possibility of broken bones is to __________
Move him no more than is absolutely necessary and call a doctor
An oiler who is working on a repair job which has to be EXPEDITED is working on a job that must be done _________
As quickly as possible
An oiler who is ADEPT at his job is one who is __________
Skilled
Mineral oils are USUALLY refined from _________ products.
Crude Petroleum
In general, light-bodied oils are MOST suitable for _________
Light loads at high speeds
Of the following, a good lubricant should ALWAYS possess _________
Minimum impurities
Of the following oils, the one which is generally considered useless as a lubricant is _________ oil.
Linseed
The property of a lubricant that a Saybolt viscosimeter measures is called the
Degree of fluidity
The texture of calcium-base is USUALLY __________
Smooth
The equipment commonly used to sperate heavy liquids from the lighter liquids is called a _________
Centrifuge
Clean storage of lubricants and proper handling methods _________
Prevent injury and breakdown to machinery
As an oiler, you notice a leak around the piston rod of a double acting water pump. In order to reduce this leak, you should FIRST tighten each hexagon nut on the packing gland one __________
Sixth of a turn
A lubricant that possesses high adhesion is LESS likely _________
To run out of a bearing
Of the following the lubricants, the one which is USUALLY NOT attacked by acids is __________
Graphite
Packing glands of reciprocating pumps or compressores should generally be _________
Tightened when machine is shut down over night
The device that feeds oil in direct porportion to the speed of a steam engine is called a _________ lubricator.
Foced Feed
When installing four new packing rings in a stuffing box, the joints of the packing should be placed _________ apart.
90 degrees
The valve that allows oil to flow in one direction only is commonly know as a _________ valve.
Check
The minimum amount of oil required in a system which circulates 30 gallons of oil per minute, with sufficent oil to give a complete oil change each 8 minutes, is MOST NEARLY __________ gallons.
240
Spontaneous ignition is USUALLY caused by the combination of poor ventilation and a pile of __________
Oily waste
The inside dimensions of a rectangular oil gravity tank are: height 15", width 9", length 10". The amount of oil in the tank, in gallons, (231 cu. in. =1 gallon) when the oil level is 9" high is MOST NEARLY _________
3.5
If 30 gallons of oil cost $9.60, 45 gallons of oil at the same rate will cost _________
$14.40
If an oiler earns $1800 in the first six months of a year and recieves a 10% raise in salary for the next six months of the same year, his total earnings for the year will be __________
$3780
If the cost of lubricating oil increases 15%, then a gallon of oil which used to cost $2.00 will now cost MOST NEARLY __________
$2.30
The sum of 7/8", 3/4", 1/2", and 3/8" is MOST NEARLY _________
2 1/2"
A safe recommendation for the bearing lubricant of a steam engine equipped with oil cups would be a(n) _________ oil.
Reasonably heavy
A crankcase explosions in an internal combustion engine _________
Are preventable by keeping air out of the crankcase when practicable
An oiler has put an excess amount of lube oil into the crankcase of an air conditioning refrigeration compressor. The MOST likely effect will be ________
That the oil carried over will be removed by an oil separator
When operating a freon refrigeration compressor, it is found that _________
The refrigerant is miscible with the lubricating oil
In a centrifugal refrigeration compressor,
The only parts requiring lubrication are the bearings of the rotor and the thrust bearing
In the operation of heavy duty gears, "thick film" lubrication means that __________
The oil supports the load by hydraulic action
Reduction of ring wear in an engine is one of the jobs of a lubricant. The MOST modern method of measuring ring wear is ___________
By use of radioactive rings
Of the following types of bearings, the one which is NOT commonly used in most electric motors is _________ bearing.
Gibbs thrust
If an electric motor is regularly overlubricated, __________
It may result in oil-soaked insulation
The oil feed rate to a steam engine cylinder with a 10-inch diameter psiton APPROXIMATELY a pint each __________
5 hours
An oiler, in swabbing the piston rods of a small duplex direct-acting pump, is found to be doing this too often. The MOST probable disadvantage is _________
A waste of time and oil
An oiler has been ordered to lubricate a duplex direct-acting steam pump feeding to a boiler. To do the job effectively, he must do the following:
Swab the rods and check the hydrostatic lubricator
If a large machine is noted to have both a hand oiler and a mechanical feed lubricator, one may reasonably assume that the hand oiler _________
Is for starting
Whena compressor is used for compression of natural gas, it is a fact that _________
Properly refined straight mineral oils are recommended
When lubrication is required for a modern centrifugal blower, as in an air conditioning blower unit, __________
Grease is usually used
Of the following, the one method of lubrication which is NOT commonly used for an encased chain drive is _________ lubrication.
Gravity tank
A gear type flexible coupling is used in a gas turbine application. In this instance, ________
The coupling develops heat if misalignment occurs
The oil pressure gage of a diesel engine lubrication system shows a high reading. This may be due to _______
Oil gage out of adjustment
When large gears are bath lubricated, the oil level should be maintained so that ________
The lowest gear teeth dip into the oil
Speed reduction gears which operate exposed require _________
Lubricants of heavier body than those which are tightly encased
In a stationary diesel engine, a grade of lube oil is selected based PRINCIPALLY on ________
Minimizing carbon deposits between rings
A 300 horsepower stationary diesel engine running at full load for an hour uses a quantity of lube oil equal to about __________
One gallon
The oil cooler for a steam turbine should _______
Have an oil pressure greater than the water pressure
Of the following, the one procedure which is NOT recommended in caring for a steam turbine is to _________
Clean oil strainers regularly, usually bi-monthly
In trouble shooting in a dual fuel engine, it should be remembered that high oil _________
Temperature may result from sludge in the crankcase
In normal operation, the lubricating oil in a steam turbine will NOT _________
Affect the leaving steam
A gravity feed lube system is used for the crosshead and the amin bearing of a large horizontal ammonia refrigeration compressor. This gravity oil tank should be prvided with a valve in the feed line at its the base so that the oiler can ________
Shut off the flow of oil when making repairs
T/F The primary purpose of a lubricant is to prevent two rubbing surfaces from coming into direct contact with each other.
T
T/F An oil that can mix with water is USUALLY used to operate the hydraulic cylinders of turbine governors.
F
T/F The carbonizing og oil under the action of high temperature improves the lubricating qualities of the oil.
F
T/F Detergents are sometimes added to lubricate to prevent formation of sludge in gearboxes.
T
T/F Mineral oils can be manufactured from cotton seed products.
F
T/F Lubricants that resist the washing action of wet steam in engine cylinders are usually made by compunding mineral oils with graphite.
F
T/F The specific gravity of a lubricant is usually measure by means of a Saybolt visosimeter.
F
T/F A high-viscosity lubricant is one that has high internal fluid friction.
T
T/F Low-viscosity lubricants are BEST adaptable for low-speed machines.
F
T/F A centrifuge is USUALLY used to filer the recirculating oil in a pressure lubricating oil system.
F
T/F A gravity type lubricator USUALLY feeds oil to the piston rod of a steam engine in direct proportion to the speed of the engine.
F
T/F The temperature at which an oil will aporize and burn is commonly know as the pour point of the oil.
F
T/F Electric motors that do not have a pressure relief lubricating system or some means of adding a lubricant must periodically be disassembled, and the bearings repacked.
T
T/F Wool waste is sometimes placed in oil cups to act as a feed in order to incease the frequency of oiling.
F
T/F The hydrostatic lubricator is USUALLY used to introduce lubricant into the oil cylinder of a fuel oil pump.
F
T/F The hydrostatic lubricator is USUALLY driven by a reciprocating part of the machine it lubricates.
F
T/F A force-feed lubricator is fully automatic and delivers positive oil pressure to the main turbine bearings.
T
T/F The proper handling and storage of lubricants in power plants is USUALLY of minor importance.
F
T/F The joints of split packing rings are USUALLY spaced in a stuffing box 120° apart.
F
T/F A gate valve is properly used in a pipe line only of it is fully opened or fully closed.
T
T/F Most grease cups operate by means of a spring pressure.
F
T/F Combustible and flammable cleaning materials should NOT be stored in tightly closed metal containers.
F
T/F S.A.E. 30 oil is USUALLY the proper viscosity oil to use for meachinery bearings operatinf in 25°F temperature.
F
T/F Steam-cylinder oils are generally residual, heavy bodied oils containing 5 to 15% compounds of acidless tallow lard.
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