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competency Quiz on c04, created by mrk nthny on 14/08/2016.
mrk nthny
Quiz by mrk nthny, updated more than 1 year ago
mrk nthny
Created by mrk nthny over 8 years ago
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Resource summary

Question 1

Question
Which of the following problems occurring in a hydraulic system could cause the use of an oil having a viscosity lower than specified?
Answer
  • Increased power consumption
  • Seal deterioration
  • Fast response and hunting
  • Oil film breakdown

Question 2

Question
The portion of a hydraulic hose that determines its overall strength, is the_________.
Answer
  • braided inner layer(s)
  • inner tube
  • outer cover
  • outer armor

Question 3

Question
The pour point of lubricating oils is affected the most by which of the following?
Answer
  • Extensive centrifuging
  • Wax content
  • Water content
  • Acid content

Question 4

Question
The neutralization number of lube oil used in the machinery has exceeded its permissible range, therefore, it will be necessary to ______.
Answer
  • renew the entire oil supply
  • add make-up oil
  • purify the oil
  • operate the machinery at reduced power

Question 5

Question
An organic solid lubricant, such as graphite, is suitable as an oil additive when used in_______________.
Answer
  • machinery bearings subjected to high temperatures
  • antifriction bearings on general service pumps
  • bearings subject to fluctuating loads
  • line shaft bearings

Question 6

Question
A filter used in a multi-operation hydraulic system would most likely be located______.
Answer
  • between the pump and the directional control valves
  • at the pump suction
  • between the control valves and the actuators
  • in the actuator return lines

Question 7

Question
What is the harmful effect of sulfur in a fuel?
Answer
  • It forms a corrosive acid when mixed with water or water vapor.
  • It causes excessive smoking and soot at low firing rates.
  • It doesn't readily burn when combined with oxygen.
  • It clogs fuel oil strainers more often

Question 8

Question
Additives commonly found in turbine lubricating oil includes,______________.
Answer
  • antifoaming agents, oxidation inhibitors, and extreme pressure additives
  • corosive agents, oxidation inhibitors, and extreme pressure additives
  • corosive agents, oxidation inhibitors, and oxidation inhibitor
  • corosive agents, anti-foaming, and extreme pressure additives

Question 9

Question
The ash content of a fuel oil is significant to the operating engineer because it_____.
Answer
  • is an indication of the amount of noncombustble material present in the oil
  • indicates the quanity of energy released by burning a unit amount of fuel
  • is useful for determining proper atomization temperatures
  • reflects the overall thermal efficiency of the fuel oil service systems

Question 10

Question
Dirt should not be allowed to contaminate a grease lubricant because the_______.
Answer
  • dirt is very abrasive when mixed with grease
  • bearings will leak oil excessively
  • dirt will cause corrosion of bearing
  • grease will become inflammable

Question 11

Question
Most fuel injection nozzles are opened by ______________.
Answer
  • fuel oil pressure
  • a cam operated follower
  • a spring-loaded pressure plate
  • timing gears keyed to the crankshaft

Question 12

Question
Proper atomization of fuel in diesel engine combustion chambers will _____________.
Answer
  • improve combustion
  • affect the injection pressure
  • reduce compression pressure
  • decrease power output

Question 13

Question
Differential needle valves used in fuel injectors are directly closed by _____________.
Answer
  • spring force
  • cam action
  • fuel oil pressure
  • firing pressure

Question 14

Question
Which these can seriously damage fuel injection equipment caused by poor combustion and leads to excessive cylinder liner wear?
Answer
  • Water
  • Carbon
  • Viscosity
  • Density

Question 15

Question
Fuel injectors used in heavy fuel oil systems are usually provided with cooling to reduce _________.
Answer
  • carbon accumulation on the nozzles
  • cold corrosion of the nozzles
  • fuel viscosity for better atomization
  • fuel detonation in the cylinders

Question 16

Question
How should the fire main outlet valves, or hydrants be installed?
Answer
  • Pointing downward or horizontal to prevent kinking of the fire hose
  • In screened enclosures in all passageways
  • Where they are protected from weather
  • In a protected location to prevent cargo damage

Question 17

Question
An incorrect spray pattern produced by a diesel engine fuel injection nozzle can be directly caused by ____________.
Answer
  • overcooling of the nozzle
  • incorrect fuel rack setting
  • low firing pressure
  • excessive lube oil temperature

Question 18

Question
Fuel is admitted to a diesel engine cylinder through the _______________.
Answer
  • injector nozzles
  • intake valves
  • carburetor
  • exhaust ports

Question 19

Question
Fuel consumption is usually measured by a flow meter with a unit of __________.
Answer
  • kg/h
  • m°/s
  • m/c
  • tons/hr

Question 20

Question
What kind of lubrication wherein the contact surfaces are completely separated by an oil film?
Answer
  • Hydrodynamic
  • Mixed lubrication
  • Boundary lubrication
  • Forced lubrication

Question 21

Question
Maintaining the proper fuel oil temperature will result in _____________.
Answer
  • improved atomization
  • the elimination of valve wear
  • a decrease in cylinder blow-by
  • an increase in cylinder blow-by

Question 22

Question
A vessel has been equipped with an oil lubricated stern bearing and is undergoing a routine drydocking. Which of the following inspections should be made when the tail-shaft has been drawn?
Answer
  • The overall condition of the bearing surface should be examined
  • The shaft liner should be inspected for cracks and tested to insure a tight fit
  • The stern tube should be tested for cracks with dye penetrant
  • All of these choices

Question 23

Question
What is the main advantage of unit injectors over other fuel injection system?
Answer
  • The lack of high pressure fuel lines
  • Their relatively low injection pressures
  • Reduced wear of spray orifices
  • The lessened chance of fuel leaks into the engine sump

Question 24

Question
What is the purpose of an accumulator in a hydraulic system?
Answer
  • To store potential energy in the form of hydraulic fluid under pressure in the system
  • To collect any dirt in the system
  • To collect fluid from any small leak
  • To preheat the fluid during cold weather

Question 25

Question
Fuel oil discharged to the diesel engine cylinder is atomized at the _____________.
Answer
  • injector nozzle tip
  • turbocharger
  • carburetor
  • fuel oil pump

Question 26

Question
Which of the following fuel oil characteristic is being used in the calculation / computations of quantity?
Answer
  • Density
  • Viscosity
  • Flash point
  • Water content

Question 27

Question
On purifiers, as a rule of thumb, the time interval set between automatic de-sludging of 180 cst heavy fuel oil should be .............. ?
Answer
  • 2 to 3 hours
  • 1 to 2 hours
  • 4 to 6 hours
  • 6 to 8 hours

Question 28

Question
A segregated ballast system is a system where ___________.
Answer
  • ballast and cargo tanks are separated by cofferdams
  • all ballast is processed through the oily water separator
  • ballast is taken on and discharged through a separate main deck riser
  • all ballast lines, tanks and pumps are independent of those used for oil

Question 29

Question
In the diesel cycle, at what stage of the compression stroke is fuel injected inside the cylinder?
Answer
  • Before the end
  • At the beginning
  • At the end
  • After the end

Question 30

Question
How are hydraulic valve lash adjusters on diesel engine rocker arm assemblies lubricated?
Answer
  • By forced lube oil supply
  • By sealed self-lubricators
  • By metered hydraulic oil supply
  • By cup-fed grease

Question 31

Question
On a gear pump, what is the usual method of reducing the delivery pressure?
Answer
  • By adjusting the internal spring loaded pressure relief valve.
  • By throttling the suction valve.
  • By throttling the discharge valve.
  • By fitting an orifice in the discharge line.

Question 32

Question
When taking over the engine room watch, what should you check concerning the operational lubricating oil purifier ?
Answer
  • Check whether throughput is minimum, check the overflow pipe, check whether the alarm is activated
  • Check whether throughput is on maximum, check the water seal, check the overflow/water flow off pipe, check inlet temperature and back pressure.
  • Check the setting of the timers, check the inlet temperature, the back pressure, the bearing temperatures.
  • Check the Ferodo coupling, the bearing temperatures, the inlet temperature and the back pressure.

Question 33

Question
Fuel injectors used in heavy fuel oil systems are usually provided with cooling to reduce _________.
Answer
  • carbon accumulation on the nozzles
  • cold corrosion of the nozzles
  • fuel viscosity for better atomization
  • fuel detonation in the cylinders

Question 34

Question
Fuel injection systems meter fuel, atomize fuel and ____________.
Answer
  • inject fuel at the proper time
  • create turbulence in the combustion chamber
  • aid in completing cylinder scavenging
  • minimize fuel penetration into the cylinder

Question 35

Question
The lubricating oil on the exhaust side of the turbine blower gets dirty after only a few hours in service. What can the reason be ?
Answer
  • Labyrinth seal leaking exhaust gas into the oil.
  • Damaged or worn turbine side bearing.
  • The wrong type of oil used.
  • Cooling water leak into oil space..

Question 36

Question
For a continous operation of diesel engine, why is it that the use of a duplex filter unit would be the best arrangement?
Answer
  • Changing filter elements would not interrupt engine operation
  • Filtering occurs twice in each pass of oil through the system
  • Clogging will not occur
  • Dropping pressure is half of that through a single filter unit

Question 37

Question
Which characteristic of fuel oil is the most significant when determining the temperature to which the fuel oil must be heated for proper atomization?
Answer
  • viscosity
  • flashpoint
  • pour point
  • specific gravity

Question 38

Question
If a bilge pump is able to develop vacuum, but is unable to sufficiently pump out the bilges, you would check for all of the following EXCEPT _____.
Answer
  • the circuit breaker
  • for leaks in the suction piping
  • relief valve is not properly seated
  • the suction strainer

Question 39

Question
Which type of pump would be most suitable for pumping large quantities such as oil cargoes ?
Answer
  • Centrifugal pumps.
  • Gear pumps.
  • Screw pumps.
  • Reciprocating pumps.

Question 40

Question
A connection between bilge and ballast line must be made by installing a ______.
Answer
  • Non-Return Valve
  • Globel Valve
  • Gate Valve
  • Ball Valve

Question 41

Question
When heated, fuel oil will ______.
Answer
  • increase in specific gravity
  • have a higher specific heat
  • expand in volume
  • increase in viscosity

Question 42

Question
The construction of the main propulsion engine lube oil sump should ________________.
Answer
  • retain the lube oil as long as possible before it recirculates through the system
  • have no plating joints of 90°
  • be provided with only a perfectly horizontal bottom
  • provide drain/return lines that are no greater than 24 inches from the pump suction

Question 43

Question
What might be the cause of marine diesel engine having an excessive consumption of lubricating oil?
Answer
  • Excessive piston ring wear
  • High lube oil viscosity
  • Insufficient lube oil temperature
  • Dirty lube oil filters

Question 44

Question
The flash point of a residual fuel should be used to determine the _____.
Answer
  • highest temperature to which the oil may be heated in a storage tank
  • highest temperature to which the oil may be heated for atomization
  • minimum temperature to which the oil should be heated for transferring
  • minimum temperature to which the oil should be heated in the fuel oil heater

Question 45

Question
A hydraulic actuator is a device that uses hydraulic energy coming from a hydraulic pump and produces linear mechanical power. What particularly is the component of the device that produces linear mechanical power?
Answer
  • Hydraulic cylinder
  • Hydraulic pump
  • Hydraulic motor
  • Hydraulic clutch

Question 46

Question
Burning fuel with a high sulfur content in a diesel engine will ____________.
Answer
  • produce corrosion in the cylinder and exhaust system at low loads
  • increase thermal efficiency
  • cause clogging of the fuel system
  • increase the ability of the engine to start in cold weather

Question 47

Question
Fuel is admitted to a diesel engine cylinder through the _______________.
Answer
  • injector nozzles
  • intake valves
  • carburetor
  • exhaust ports

Question 48

Question
What is the harmful effect of sulfur in a fuel?
Answer
  • it forms a corrosive acid when mixed with water or water vapor
  • it causes excessive smoking and soot at low firing rates
  • it doesn’t readily burn when combined with oxygen
  • it clogs fuel oil strainers more often

Question 49

Question
What is the best gasket material to use in cargo fuel oil lines?
Answer
  • Oil-resistant sheet packing
  • Minimize the effect of a listing condition
  • Unvulcanized packing
  • Cork sheet packing

Question 50

Question
Fuel oil viscosity to the atomizer can be reduced by ________.
Answer
  • increasing the fuel oil heater steam supply
  • mixing heavier oil with the fuel
  • changing the atomizer orifice size
  • increasing fuel oil pressure

Question 51

Question
The BTU value of fuel oil is determined by a/an _______.
Answer
  • calorimeter
  • open cup test
  • viscosimeter
  • hydrometer

Question 52

Question
What would you do first to prevent oil from escaping into the sea when ballasting through a cargo piping system?
Answer
  • Start the cargo pump, then open sea suction valves
  • Open sea suction valve, then start the cargo pump
  • Open block valves, then start the cargo pump
  • Open sluice valves, then start the cargo pump

Question 53

Question
Which of the following signs may indicate there is serious water contamination in the M/E lube oil system ?
Answer
  • Whitish lube oil
  • Partly corroded piston rings
  • Yellowish lube oil
  • Poor performance of the engine

Question 54

Question
Which component of a hydraulic system would enable the pump to be temporarily shutdown. And yet provide an instantaneous source of hydraulic oil?
Answer
  • Accumulator
  • pressure compensator valve
  • modulator
  • sump actuator

Question 55

Question
What should be done before performing any maintenance on a hydraulic system storing energy in an accumulator?
Answer
  • Bleed off all pressure within the system
  • Pressurized the system to test for leaks
  • Operate the machine until it reaches normal temperature
  • Disconnect the pump pressure control switch

Question 56

Question
A vessel whose fuel tanks are half full is subject to ___________
Answer
  • free surface effect
  • severe sagging
  • serious loss of reserve buoyancy
  • severe hogging

Question 57

Question
Demulsibility of a lube oil is defined as _________________.
Answer
  • the ability of oil to separate from water
  • the temperature at which oil flows rapidly
  • a measure of the water in a lube oil system
  • an emulsion of different grades of oil

Question 58

Question
Oily water separators perform the following function?
Answer
  • They make sure that no oil is pumped overboard.
  • They clean engine scavenges.
  • They remove the water from the fuel before it is burnt.
  • They make sure that no raw sewage is pumped overboard.

Question 59

Question
Which of the following describes one of the functions of the ballasting system?
Answer
  • To stabilize the ship by flooding certain designed tanks with seawater
  • To permit flooding of any fuel oil storage tank on any class of ship
  • To use it as a secondary service system
  • To store reserve feed or potable water for extended cruises

Question 60

Question
Fuel oil discharged to the diesel engine cylinder is atomized at the _____________.
Answer
  • injector nozzles
  • turbocharger
  • carburetor
  • exhaust ports

Question 61

Question
What procedure must be done in order to have the fuel oil viscosity entering the atomizer be reduced?
Answer
  • Increase the supply of steam to fuel oil heater
  • Use lighter kind of fuel oil
  • Increase the fuel oil specific gravity
  • Increase the delivery pressure of fuel oil

Question 62

Question
Oil mist detector takes a succession of air samples from all the compartments within the crankcase. When is the oil mist detector alarm activates?
Answer
  • When the concentration of mist is of the least amount needed for ignition which is 2-5%
  • When the concentration of mist is of the least amount needed for ignition which is 1%
  • When the concentration of mist is of the least amount needed for ignition which is 6-10%
  • When the concentration of mist is of the least amount needed for ignition which is 15%

Question 63

Question
Which of the pumps listed is normally used in fuel oil service systems?
Answer
  • positive displacement rotary
  • two-stage centrifugal
  • nonvented plunger
  • explosion proof gear

Question 64

Question
The purpose of the relief valve in a fuel oil service system is to ________.
Answer
  • protect the service pump from high discharge pressure
  • regulate the atomizer oil pressure
  • control the oil pressure regulators.
  • supply constant pressure to the burner combustion control valves

Question 65

Question
The boiler fuel oil service pump normally takes suction from the _______.
Answer
  • fuel oil settler tank
  • fuel oil heater discharge
  • contaminated drain inspection tank
  • double bottom fuel tanks

Question 66

Question
The fuel oil meter in the fuel oil service system should be bypassed when ______.
Answer
  • warming the oil in the burner headers by recirculation prior to boiler light off
  • transferring fuel from storage to settler tank to avoid erroneous fuel consumption readings
  • conducting programmed routine maintenance of the meter while underway
  • finished with engines is given by the bridge

Question 67

Question
When warming up a fuel oil service system, you should open the steam supply to the fuel oil heaters _____.
Answer
  • After you start the fuel oil service pump
  • Before you start the fuel oil service pump
  • Before you open the recirculating valve
  • Only if the setters are incapable of heating the oil

Question 68

Question
The valve located between the fuel oil header and the burner valve is known as the ___.
Answer
  • Root valve
  • Return valve
  • Header valve
  • Register valve

Question 69

Question
Machinery driving fuel oil transfer and fuel oil service pumps must be fitted with a remote means of stopping the machinery from ______.
Answer
  • outside the space concerned
  • within the space concerned
  • within the fireroom
  • the throttle station

Question 70

Question
Which of the following systems must have an emergency stop, protected with a glass enclosure, and located outside of the machinery space?
Answer
  • fuel oil service pump
  • main fire pump
  • all of the above
  • main circulating/bilge injection valve

Question 71

Question
The fins on the tubes of a fin type fuel oil heater are provided to ____.
Answer
  • Increase heater efficiency
  • Clean the fuel oil
  • Prevent tube erosion
  • Decrease fuel flow

Question 72

Question
The primary purpose of the heater used in a pressurized fuel oil system is to ____.
Answer
  • Reduce fuel oil viscosity for proper atomization
  • Reduce fuel oil specific gravity for better combustion
  • Increase the fire point of the fuel oil
  • Improve the flash point of the fuel oil

Question 73

Question
What will occur if the fuel oil heater condensate returns are not opened or are partially plugged?
Answer
  • Fuel may not be heated sufficiently for proper combustion
  • Fuel will become overheated
  • Fuel consumption will decrease
  • Fuel pump slippage will result

Question 74

Question
Failure of the fuel oil service pump to maintain fuel oil flow to the burner could be caused by ____.
Answer
  • Dirty fuel oil strainers
  • A high relief valve setting
  • Excessive return line oil pressure
  • Excessive fuel pump speed

Question 75

Question
The minimum temperature requirements for fuel oil in storage tanks is related to the _______.
Answer
  • pumpability of the oil
  • firepoint of the oil
  • size of the vents
  • size of the containment area in case of overflow

Question 76

Question
What is the harmful effect of sulfur in a fuel?
Answer
  • it forms a corrosive acid when mixed with water or water vapor
  • it causes excessive smoking and soot at low firing rates
  • it doesn’t readily burn when combined with oxygen
  • it clogs fuel oil strainers more often

Question 77

Question
The BTU value of fuel oil is determined by a/an _______.
Answer
  • calorimeter
  • open cup test
  • viscosimeter
  • hydrometer

Question 78

Question
When heated, fuel oil will ______.
Answer
  • increase in specific gravity
  • have a higher specific heat
  • expand in volume
  • increase in viscosity

Question 79

Question
The flash point of a residual fuel should be used to determine the _____.
Answer
  • highest temperature to which the oil may be heated in a storage tank
  • highest temperature to which the oil may be heated for atomization
  • minimum temperature to which the oil should be heated for transferring
  • minimum temperature to which the oil should be heated in the fuel oil heater

Question 80

Question
Which characteristic of fuel oil is the most significant when determining the temperature to which the fuel oil must be heated for proper atomization?
Answer
  • viscosity
  • flashpoint
  • pour point
  • specific gravity

Question 81

Question
Fuel oil viscosity to the atomizer can be reduced by ________.
Answer
  • increasing the fuel oil heater steam supply
  • mixing heavier oil with the fuel
  • changing the atomizer orifice size
  • increasing fuel oil pressure

Question 82

Question
The rate of expansion of heated fuel oil varies with the ______.
Answer
  • Specific gravity
  • conductivity
  • viscosity
  • volume

Question 83

Question
An emergency bilge suction is required for _____.
Answer
  • machinery space bilges
  • ballast tanks
  • sludge tanks
  • cargo hold bilges

Question 84

Question
If a bilge pump is able to develop vacuum, but is unable to sufficiently pump out the bilges, you would check for all of the following EXCEPT _____.
Answer
  • the circuit breaker
  • for leaks in the suction piping
  • relief valve is not properly seated
  • the suction strainer

Question 85

Question
The construction of the main propulsion engine lube oil sump should ________________.
Answer
  • retain the lube oil as long as possible before it recirculates through the system
  • have no plating joints of 90°
  • be provided with only a perfectly horizontal bottom
  • provide drain/return lines that are no greater than 24 inches from the pump suction

Question 86

Question
Demulsibility of a lube oil is defined as _________________.
Answer
  • the ability of oil to separate from water
  • the temperature at which oil flows rapidly
  • a measure of the water in a lube oil system
  • an emulsion of different grades of oil

Question 87

Question
One characteristic of a lubricating oil adversely affecting the results of centrifuging is ____________.
Answer
  • low oil demulsibility
  • high TBN value
  • low oil floc point
  • low oil neutralization number

Question 88

Question
Oil emulsification in engine lubricating oils will tend to ____.
Answer
  • displace lubricating oil required in areas of friction
  • decrease sludge formation in lubricating oil
  • cause water to separate from the oil
  • improve the lubricating oil viscosity

Question 89

Question
The function of lubricating oil is to ______________.
Answer
  • maintain a pressurized fluid film between moving surfaces
  • maintain even distribution of bearing wear
  • maintain a constant oil temperature
  • remove entrained water

Question 90

Question
An oil fog lubrication system is recommended for __________.
Answer
  • high speed continuous operation of roller bearings
  • gear shaft bearings
  • heavily loaded and high speed ball bearings
  • low and moderate speed ball bearings

Question 91

Question
To ensure adequate lubrication and to prevent a high operating temperature, the recommended amount of grease in a ball or roller bearing is approximately _________________.
Answer
  • 35-40% of the void space in the bearing
  • 10-15% of the void space in the bearing
  • 90-95% of the void space in the bearing
  • 65-70% of the void space in the bearing

Question 92

Question
The lignum vitae in a stern tube bearing is normally lubricated with ______.
Answer
  • water
  • grease
  • oil
  • tallow

Question 93

Question
Adsorption filters are not commonly used in steam turbine or diesel engine lubricating systems because they ____________.
Answer
  • remove additives from the lube oil
  • utilize exotic and expensive filtering media making them too costly for use.
  • are only effective at temperatures below 100°F
  • can adsorb no more than five times their weight in water

Question 94

Question
The substance primarily responsible for heat loss in the combustion process is _____________.
Answer
  • nitrogen
  • sulphur
  • carbon
  • hydrogen

Question 95

Question
One function provided by a hydraulic accumulator is to _____.
Answer
  • Absorb sudden changes in hydraulic fluid flow occurring in the system
  • Provide an area where air can separate from the oil
  • Provide an area to separate solid contaminants from the oil
  • Act as an oil and water separator

Question 96

Question
The component used in a hydraulic system to store potential energy in the form of hydraulic fluid under pressure, is the _____.
Answer
  • Accumulator
  • Ram
  • Pump
  • Piping

Question 97

Question
How can the chance of contaminating hydraulic fluid be decreased when working on hydraulic systems?
Answer
  • Clean the fittings before they are disconnected.
  • Place drip pans under leaky fittings.
  • Seal any cracks in lines with Permatex.
  • Coat all threads with graphite oil.

Question 98

Question
The volatility of any oil may be indicated by _____________. I. the flash point II. the fire point III. the autogenous ignition point
Answer
  • I, II and III
  • I only
  • I and II only
  • II and III only

Question 99

Question
The term 'pour point' is defined as the lowest temperature at which lubricating oils will flow ____________.
Answer
  • by gravity
  • rapidly
  • at a rate of 60cc per second
  • through a standard orifice at a specified temperature

Question 100

Question
Which of the following problems occurring in a hydraulic system can be caused by the use of an oil having a viscosity lower than specified?
Answer
  • Increased power consumption
  • Seal deterioration
  • Fast response and hunting
  • Oil film breakdown

Question 101

Question
The degree to which the viscosity of an oil will change with a change in temperature is indicated by the _______________.
Answer
  • viscosity index
  • weight designation
  • thermal change value
  • pour point

Question 102

Question
Which of the following precautions should be observed concerning the introduction of a fire resistant fluid into a hydraulic system?
Answer
  • Deterioration of paints, seals, metals, and electrical insulation may occur.
  • Fluid viscosity always increases as a normal result of its use.
  • Decreased wear rates of components is an advantage of its use.
  • Only chemically active filters may be used.

Question 103

Question
Which characteristic or condition will have the greatest effect on increasing a hydraulic oil’s viscosity?
Answer
  • pressure
  • pour point
  • cloud point
  • vacuum

Question 104

Question
Increased internal leakage, in addition to poor hydraulic system response, and inadequate lubrication, is the result of _____.
Answer
  • low hydraulic oil viscosity
  • pump bearings in poor condition
  • excessively worn actuator-piston packing
  • broken directional control valve centering springs

Question 105

Question
The major source of chemical contaminants in hydraulic fluid is _____.
Answer
  • oxidation by-products
  • microscopic steel shavings
  • abrasive waste
  • anti-oxidant compounds

Question 106

Question
Purging air from a hydraulic system is necessary when _____.
Answer
  • the system has been drained and then filled with new oil
  • adding small amounts of oil to the system
  • the system has been overheated
  • the system has been idle for a long period of time

Question 107

Question
Sluggish response or action of the hydraulic actuators may be a result of _____.
Answer
  • excessively high oil viscosity
  • insufficient load
  • reservoir level being maintained two inches above normal
  • relief-valve pressure setting too high

Question 108

Question
Cavitation in a hydraulic pump is indicated by noisy pump operation and can be caused by a/an _____.
Answer
  • clogged suction strainer in the reservoir
  • high fluid level in the reservoir
  • hydraulic fluid low floc point
  • excessive discharge pressure from the pump

Question 109

Question
Air trapped in one end of a hydraulic actuator may be indicated by _____.
Answer
  • erratic or jerky motion of the actuator
  • a pump discharge pressure that is consistent, but higher than normal
  • consistently faster response or movement of the actuator
  • overspeeding of the pump

Question 110

Question
Energy losses occurring in a hydraulic system are ultimately absorbed by the _____.
Answer
  • atmosphere as heat
  • reservoir expansion chamber
  • hydraulic piping flexibility
  • fluid as friction

Question 111

Question
Overheating of the hydraulic fluid in an electro-hydraulic anchor windlass can result from a/an _____.
Answer
  • low fluid viscosity around the shaft seal
  • overload on the pump motor
  • low fluid level in the reservoir
  • high oil level in the sump

Question 112

Question
The rate of fouling on the oil side of fuel heaters is directly related to the _______.
Answer
  • steam pressure in the heater
  • shape of the heating coils in the heater
  • oil pressure in the heater
  • rate of oil flow through the heater
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