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competency Quiz on c04, created by mrk nthny on 14/08/2016.

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Question 1 of 112

1

Which of the following problems occurring in a hydraulic system could cause the use of an oil having a viscosity lower than specified?

Select one of the following:

  • Increased power consumption

  • Seal deterioration

  • Fast response and hunting

  • Oil film breakdown

Explanation

Question 2 of 112

1

The portion of a hydraulic hose that determines its overall strength, is the_________.

Select one of the following:

  • braided inner layer(s)

  • inner tube

  • outer cover

  • outer armor

Explanation

Question 3 of 112

1

The pour point of lubricating oils is affected the most by which of the following?

Select one of the following:

  • Extensive centrifuging

  • Wax content

  • Water content

  • Acid content

Explanation

Question 4 of 112

1

The neutralization number of lube oil used in the machinery has exceeded its permissible range, therefore, it will be necessary to ______.

Select one of the following:

  • renew the entire oil supply

  • add make-up oil

  • purify the oil

  • operate the machinery at reduced power

Explanation

Question 5 of 112

1

An organic solid lubricant, such as graphite, is suitable as an oil additive when used in_______________.

Select one of the following:

  • machinery bearings subjected to high temperatures

  • antifriction bearings on general service pumps

  • bearings subject to fluctuating loads

  • line shaft bearings

Explanation

Question 6 of 112

1

A filter used in a multi-operation hydraulic system would most likely be located______.

Select one of the following:

  • between the pump and the directional control valves

  • at the pump suction

  • between the control valves and the actuators

  • in the actuator return lines

Explanation

Question 7 of 112

1

What is the harmful effect of sulfur in a fuel?

Select one of the following:

  • 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

Explanation

Question 8 of 112

1

Additives commonly found in turbine lubricating oil includes,______________.

Select one of the following:

  • 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

Explanation

Question 9 of 112

1

The ash content of a fuel oil is significant to the operating engineer because it_____.

Select one of the following:

  • 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

Explanation

Question 10 of 112

1

Dirt should not be allowed to contaminate a grease lubricant because the_______.

Select one of the following:

  • dirt is very abrasive when mixed with grease

  • bearings will leak oil excessively

  • dirt will cause corrosion of bearing

  • grease will become inflammable

Explanation

Question 11 of 112

1

Most fuel injection nozzles are opened by ______________.

Select one of the following:

  • fuel oil pressure

  • a cam operated follower

  • a spring-loaded pressure plate

  • timing gears keyed to the crankshaft

Explanation

Question 12 of 112

1

Proper atomization of fuel in diesel engine combustion chambers will _____________.

Select one of the following:

  • improve combustion

  • affect the injection pressure

  • reduce compression pressure

  • decrease power output

Explanation

Question 13 of 112

1

Differential needle valves used in fuel injectors are directly closed by _____________.

Select one of the following:

  • spring force

  • cam action

  • fuel oil pressure

  • firing pressure

Explanation

Question 14 of 112

1

Which these can seriously damage fuel injection equipment caused by poor combustion and leads to excessive cylinder liner wear?

Select one of the following:

  • Water

  • Carbon

  • Viscosity

  • Density

Explanation

Question 15 of 112

1

Fuel injectors used in heavy fuel oil systems are usually provided with cooling to reduce _________.

Select one of the following:

  • carbon accumulation on the nozzles

  • cold corrosion of the nozzles

  • fuel viscosity for better atomization

  • fuel detonation in the cylinders

Explanation

Question 16 of 112

1

How should the fire main outlet valves, or hydrants be installed?

Select one of the following:

  • 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

Explanation

Question 17 of 112

1

An incorrect spray pattern produced by a diesel engine fuel injection nozzle can be directly caused by ____________.

Select one of the following:

  • overcooling of the nozzle

  • incorrect fuel rack setting

  • low firing pressure

  • excessive lube oil temperature

Explanation

Question 18 of 112

1

Fuel is admitted to a diesel engine cylinder through the _______________.

Select one of the following:

  • injector nozzles

  • intake valves

  • carburetor

  • exhaust ports

Explanation

Question 19 of 112

1

Fuel consumption is usually measured by a flow meter with a unit of __________.

Select one of the following:

  • kg/h

  • m°/s

  • m/c

  • tons/hr

Explanation

Question 20 of 112

1

What kind of lubrication wherein the contact surfaces are completely separated by an oil film?

Select one of the following:

  • Hydrodynamic

  • Mixed lubrication

  • Boundary lubrication

  • Forced lubrication

Explanation

Question 21 of 112

1

Maintaining the proper fuel oil temperature will result in _____________.

Select one of the following:

  • improved atomization

  • the elimination of valve wear

  • a decrease in cylinder blow-by

  • an increase in cylinder blow-by

Explanation

Question 22 of 112

1

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?

Select one of the following:

  • 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

Explanation

Question 23 of 112

1

What is the main advantage of unit injectors over other fuel injection system?

Select one of the following:

  • 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

Explanation

Question 24 of 112

1

What is the purpose of an accumulator in a hydraulic system?

Select one of the following:

  • 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

Explanation

Question 25 of 112

1

Fuel oil discharged to the diesel engine cylinder is atomized at the _____________.

Select one of the following:

  • injector nozzle tip

  • turbocharger

  • carburetor

  • fuel oil pump

Explanation

Question 26 of 112

1

Which of the following fuel oil characteristic is being used in the calculation / computations of quantity?

Select one of the following:

  • Density

  • Viscosity

  • Flash point

  • Water content

Explanation

Question 27 of 112

1

On purifiers, as a rule of thumb, the time interval set between automatic de-sludging of 180 cst heavy fuel oil should be .............. ?

Select one of the following:

  • 2 to 3 hours

  • 1 to 2 hours

  • 4 to 6 hours

  • 6 to 8 hours

Explanation

Question 28 of 112

1

A segregated ballast system is a system where ___________.

Select one of the following:

  • 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

Explanation

Question 29 of 112

1

In the diesel cycle, at what stage of the compression stroke is fuel injected inside the cylinder?

Select one of the following:

  • Before the end

  • At the beginning

  • At the end

  • After the end

Explanation

Question 30 of 112

1

How are hydraulic valve lash adjusters on diesel engine rocker arm assemblies lubricated?

Select one of the following:

  • By forced lube oil supply

  • By sealed self-lubricators

  • By metered hydraulic oil supply

  • By cup-fed grease

Explanation

Question 31 of 112

1

On a gear pump, what is the usual method of reducing the delivery pressure?

Select one of the following:

  • 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.

Explanation

Question 32 of 112

1

When taking over the engine room watch, what should you check concerning the operational lubricating oil purifier ?

Select one of the following:

  • 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.

Explanation

Question 33 of 112

1

Fuel injectors used in heavy fuel oil systems are usually provided with cooling to reduce _________.

Select one of the following:

  • carbon accumulation on the nozzles

  • cold corrosion of the nozzles

  • fuel viscosity for better atomization

  • fuel detonation in the cylinders

Explanation

Question 34 of 112

1

Fuel injection systems meter fuel, atomize fuel and ____________.

Select one of the following:

  • inject fuel at the proper time

  • create turbulence in the combustion chamber

  • aid in completing cylinder scavenging

  • minimize fuel penetration into the cylinder

Explanation

Question 35 of 112

1

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 ?

Select one of the following:

  • 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..

Explanation

Question 36 of 112

1

For a continous operation of diesel engine, why is it that the use of a duplex filter unit would be the best arrangement?

Select one of the following:

  • 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

Explanation

Question 37 of 112

1

Which characteristic of fuel oil is the most significant when determining the temperature to which the fuel oil must be heated for proper atomization?

Select one of the following:

  • viscosity

  • flashpoint

  • pour point

  • specific gravity

Explanation

Question 38 of 112

1

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 _____.

Select one of the following:

  • the circuit breaker

  • for leaks in the suction piping

  • relief valve is not properly seated

  • the suction strainer

Explanation

Question 39 of 112

1

Which type of pump would be most suitable for pumping large quantities such as oil cargoes ?

Select one of the following:

  • Centrifugal pumps.

  • Gear pumps.

  • Screw pumps.

  • Reciprocating pumps.

Explanation

Question 40 of 112

1

A connection between bilge and ballast line must be made by installing a ______.

Select one of the following:

  • Non-Return Valve

  • Globel Valve

  • Gate Valve

  • Ball Valve

Explanation

Question 41 of 112

1

When heated, fuel oil will ______.

Select one of the following:

  • increase in specific gravity

  • have a higher specific heat

  • expand in volume

  • increase in viscosity

Explanation

Question 42 of 112

1

The construction of the main propulsion engine lube oil sump should ________________.

Select one of the following:

  • 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

Explanation

Question 43 of 112

1

What might be the cause of marine diesel engine having an excessive consumption of lubricating oil?

Select one of the following:

  • Excessive piston ring wear

  • High lube oil viscosity

  • Insufficient lube oil temperature

  • Dirty lube oil filters

Explanation

Question 44 of 112

1

The flash point of a residual fuel should be used to determine the _____.

Select one of the following:

  • 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

Explanation

Question 45 of 112

1

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?

Select one of the following:

  • Hydraulic cylinder

  • Hydraulic pump

  • Hydraulic motor

  • Hydraulic clutch

Explanation

Question 46 of 112

1

Burning fuel with a high sulfur content in a diesel engine will ____________.

Select one of the following:

  • 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

Explanation

Question 47 of 112

1

Fuel is admitted to a diesel engine cylinder through the _______________.

Select one of the following:

  • injector nozzles

  • intake valves

  • carburetor

  • exhaust ports

Explanation

Question 48 of 112

1

What is the harmful effect of sulfur in a fuel?

Select one of the following:

  • 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

Explanation

Question 49 of 112

1

What is the best gasket material to use in cargo fuel oil lines?

Select one of the following:

  • Oil-resistant sheet packing

  • Minimize the effect of a listing condition

  • Unvulcanized packing

  • Cork sheet packing

Explanation

Question 50 of 112

1

Fuel oil viscosity to the atomizer can be reduced by ________.

Select one of the following:

  • increasing the fuel oil heater steam supply

  • mixing heavier oil with the fuel

  • changing the atomizer orifice size

  • increasing fuel oil pressure

Explanation

Question 51 of 112

1

The BTU value of fuel oil is determined by a/an _______.

Select one of the following:

  • calorimeter

  • open cup test

  • viscosimeter

  • hydrometer

Explanation

Question 52 of 112

1

What would you do first to prevent oil from escaping into the sea when ballasting through a cargo piping system?

Select one of the following:

  • 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

Explanation

Question 53 of 112

1

Which of the following signs may indicate there is serious water contamination in the M/E lube oil system ?

Select one of the following:

  • Whitish lube oil

  • Partly corroded piston rings

  • Yellowish lube oil

  • Poor performance of the engine

Explanation

Question 54 of 112

1

Which component of a hydraulic system would enable the pump to be temporarily shutdown. And yet provide an instantaneous source of hydraulic oil?

Select one of the following:

  • Accumulator

  • pressure compensator valve

  • modulator

  • sump actuator

Explanation

Question 55 of 112

1

What should be done before performing any maintenance on a hydraulic system storing energy in an accumulator?

Select one of the following:

  • 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

Explanation

Question 56 of 112

1

A vessel whose fuel tanks are half full is subject to ___________

Select one of the following:

  • free surface effect

  • severe sagging

  • serious loss of reserve buoyancy

  • severe hogging

Explanation

Question 57 of 112

1

Demulsibility of a lube oil is defined as _________________.

Select one of the following:

  • 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

Explanation

Question 58 of 112

1

Oily water separators perform the following function?

Select one of the following:

  • 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.

Explanation

Question 59 of 112

1

Which of the following describes one of the functions of the ballasting system?

Select one of the following:

  • 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

Explanation

Question 60 of 112

1

Fuel oil discharged to the diesel engine cylinder is atomized at the _____________.

Select one of the following:

  • injector nozzles

  • turbocharger

  • carburetor

  • exhaust ports

Explanation

Question 61 of 112

1

What procedure must be done in order to have the fuel oil viscosity entering the atomizer be reduced?

Select one of the following:

  • 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

Explanation

Question 62 of 112

1

Oil mist detector takes a succession of air samples from all the compartments within the crankcase. When is the oil mist detector alarm activates?

Select one of the following:

  • 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%

Explanation

Question 63 of 112

1

Which of the pumps listed is normally used in fuel oil service systems?

Select one of the following:

  • positive displacement rotary

  • two-stage centrifugal

  • nonvented plunger

  • explosion proof gear

Explanation

Question 64 of 112

1

The purpose of the relief valve in a fuel oil service system is to ________.

Select one of the following:

  • 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

Explanation

Question 65 of 112

1

The boiler fuel oil service pump normally takes suction from the _______.

Select one of the following:

  • fuel oil settler tank

  • fuel oil heater discharge

  • contaminated drain inspection tank

  • double bottom fuel tanks

Explanation

Question 66 of 112

1

The fuel oil meter in the fuel oil service system should be bypassed when ______.

Select one of the following:

  • 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

Explanation

Question 67 of 112

1

When warming up a fuel oil service system, you should open the steam supply to the fuel oil heaters _____.

Select one of the following:

  • 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

Explanation

Question 68 of 112

1

The valve located between the fuel oil header and the burner valve is known as the ___.

Select one of the following:

  • Root valve

  • Return valve

  • Header valve

  • Register valve

Explanation

Question 69 of 112

1

Machinery driving fuel oil transfer and fuel oil service pumps must be fitted with a remote means of stopping the machinery from ______.

Select one of the following:

  • outside the space concerned

  • within the space concerned

  • within the fireroom

  • the throttle station

Explanation

Question 70 of 112

1

Which of the following systems must have an emergency stop, protected with a glass enclosure, and located outside of the machinery space?

Select one of the following:

  • fuel oil service pump

  • main fire pump

  • all of the above

  • main circulating/bilge injection valve

Explanation

Question 71 of 112

1

The fins on the tubes of a fin type fuel oil heater are provided to ____.

Select one of the following:

  • Increase heater efficiency

  • Clean the fuel oil

  • Prevent tube erosion

  • Decrease fuel flow

Explanation

Question 72 of 112

1

The primary purpose of the heater used in a pressurized fuel oil system is to ____.

Select one of the following:

  • 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

Explanation

Question 73 of 112

1

What will occur if the fuel oil heater condensate returns are not opened or are partially plugged?

Select one of the following:

  • Fuel may not be heated sufficiently for proper combustion

  • Fuel will become overheated

  • Fuel consumption will decrease

  • Fuel pump slippage will result

Explanation

Question 74 of 112

1

Failure of the fuel oil service pump to maintain fuel oil flow to the burner could be caused by ____.

Select one of the following:

  • Dirty fuel oil strainers

  • A high relief valve setting

  • Excessive return line oil pressure

  • Excessive fuel pump speed

Explanation

Question 75 of 112

1

The minimum temperature requirements for fuel oil in storage tanks is related to the _______.

Select one of the following:

  • pumpability of the oil

  • firepoint of the oil

  • size of the vents

  • size of the containment area in case of overflow

Explanation

Question 76 of 112

1

What is the harmful effect of sulfur in a fuel?

Select one of the following:

  • 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

Explanation

Question 77 of 112

1

The BTU value of fuel oil is determined by a/an _______.

Select one of the following:

  • calorimeter

  • open cup test

  • viscosimeter

  • hydrometer

Explanation

Question 78 of 112

1

When heated, fuel oil will ______.

Select one of the following:

  • increase in specific gravity

  • have a higher specific heat

  • expand in volume

  • increase in viscosity

Explanation

Question 79 of 112

1

The flash point of a residual fuel should be used to determine the _____.

Select one of the following:

  • 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

Explanation

Question 80 of 112

1

Which characteristic of fuel oil is the most significant when determining the temperature to which the fuel oil must be heated for proper atomization?

Select one of the following:

  • viscosity

  • flashpoint

  • pour point

  • specific gravity

Explanation

Question 81 of 112

1

Fuel oil viscosity to the atomizer can be reduced by ________.

Select one of the following:

  • increasing the fuel oil heater steam supply

  • mixing heavier oil with the fuel

  • changing the atomizer orifice size

  • increasing fuel oil pressure

Explanation

Question 82 of 112

1

The rate of expansion of heated fuel oil varies with the ______.

Select one of the following:

  • Specific gravity

  • conductivity

  • viscosity

  • volume

Explanation

Question 83 of 112

1

An emergency bilge suction is required for _____.

Select one of the following:

  • machinery space bilges

  • ballast tanks

  • sludge tanks

  • cargo hold bilges

Explanation

Question 84 of 112

1

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 _____.

Select one of the following:

  • the circuit breaker

  • for leaks in the suction piping

  • relief valve is not properly seated

  • the suction strainer

Explanation

Question 85 of 112

1

The construction of the main propulsion engine lube oil sump should ________________.

Select one of the following:

  • 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

Explanation

Question 86 of 112

1

Demulsibility of a lube oil is defined as _________________.

Select one of the following:

  • 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

Explanation

Question 87 of 112

1

One characteristic of a lubricating oil adversely affecting the results of centrifuging is ____________.

Select one of the following:

  • low oil demulsibility

  • high TBN value

  • low oil floc point

  • low oil neutralization number

Explanation

Question 88 of 112

1

Oil emulsification in engine lubricating oils will tend to ____.

Select one of the following:

  • 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

Explanation

Question 89 of 112

1

The function of lubricating oil is to ______________.

Select one of the following:

  • maintain a pressurized fluid film between moving surfaces

  • maintain even distribution of bearing wear

  • maintain a constant oil temperature

  • remove entrained water

Explanation

Question 90 of 112

1

An oil fog lubrication system is recommended for __________.

Select one of the following:

  • high speed continuous operation of roller bearings

  • gear shaft bearings

  • heavily loaded and high speed ball bearings

  • low and moderate speed ball bearings

Explanation

Question 91 of 112

1

To ensure adequate lubrication and to prevent a high operating temperature, the recommended amount of grease in a ball or roller bearing is approximately _________________.

Select one of the following:

  • 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

Explanation

Question 92 of 112

1

The lignum vitae in a stern tube bearing is normally lubricated with ______.

Select one of the following:

  • water

  • grease

  • oil

  • tallow

Explanation

Question 93 of 112

1

Adsorption filters are not commonly used in steam turbine or diesel engine lubricating systems because they ____________.

Select one of the following:

  • 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

Explanation

Question 94 of 112

1

The substance primarily responsible for heat loss in the combustion process is _____________.

Select one of the following:

  • nitrogen

  • sulphur

  • carbon

  • hydrogen

Explanation

Question 95 of 112

1

One function provided by a hydraulic accumulator is to _____.

Select one of the following:

  • 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

Explanation

Question 96 of 112

1

The component used in a hydraulic system to store potential energy in the form of hydraulic fluid under pressure, is the _____.

Select one of the following:

  • Accumulator

  • Ram

  • Pump

  • Piping

Explanation

Question 97 of 112

1

How can the chance of contaminating hydraulic fluid be decreased when working on hydraulic systems?

Select one of the following:

  • 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.

Explanation

Question 98 of 112

1

The volatility of any oil may be indicated by _____________.
I. the flash point
II. the fire point
III. the autogenous ignition point

Select one of the following:

  • I, II and III

  • I only

  • I and II only

  • II and III only

Explanation

Question 99 of 112

1

The term 'pour point' is defined as the lowest temperature at which lubricating oils will flow ____________.

Select one of the following:

  • by gravity

  • rapidly

  • at a rate of 60cc per second

  • through a standard orifice at a specified temperature

Explanation

Question 100 of 112

1

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?

Select one of the following:

  • Increased power consumption

  • Seal deterioration

  • Fast response and hunting

  • Oil film breakdown

Explanation

Question 101 of 112

1

The degree to which the viscosity of an oil will change with a change in temperature is indicated by the _______________.

Select one of the following:

  • viscosity index

  • weight designation

  • thermal change value

  • pour point

Explanation

Question 102 of 112

1

Which of the following precautions should be observed concerning the introduction of a fire resistant fluid into a hydraulic system?

Select one of the following:

  • 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.

Explanation

Question 103 of 112

1

Which characteristic or condition will have the greatest effect on increasing a hydraulic oil’s viscosity?

Select one of the following:

  • pressure

  • pour point

  • cloud point

  • vacuum

Explanation

Question 104 of 112

1

Increased internal leakage, in addition to poor hydraulic system response, and inadequate lubrication, is the result of _____.

Select one of the following:

  • low hydraulic oil viscosity

  • pump bearings in poor condition

  • excessively worn actuator-piston packing

  • broken directional control valve centering springs

Explanation

Question 105 of 112

1

The major source of chemical contaminants in hydraulic fluid is _____.

Select one of the following:

  • oxidation by-products

  • microscopic steel shavings

  • abrasive waste

  • anti-oxidant compounds

Explanation

Question 106 of 112

1

Purging air from a hydraulic system is necessary when _____.

Select one of the following:

  • 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

Explanation

Question 107 of 112

1

Sluggish response or action of the hydraulic actuators may be a result of _____.

Select one of the following:

  • excessively high oil viscosity

  • insufficient load

  • reservoir level being maintained two inches above normal

  • relief-valve pressure setting too high

Explanation

Question 108 of 112

1

Cavitation in a hydraulic pump is indicated by noisy pump operation and can be caused by a/an _____.

Select one of the following:

  • clogged suction strainer in the reservoir

  • high fluid level in the reservoir

  • hydraulic fluid low floc point

  • excessive discharge pressure from the pump

Explanation

Question 109 of 112

1

Air trapped in one end of a hydraulic actuator may be indicated by _____.

Select one of the following:

  • 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

Explanation

Question 110 of 112

1

Energy losses occurring in a hydraulic system are ultimately absorbed by the _____.

Select one of the following:

  • atmosphere as heat

  • reservoir expansion chamber

  • hydraulic piping flexibility

  • fluid as friction

Explanation

Question 111 of 112

1

Overheating of the hydraulic fluid in an electro-hydraulic anchor windlass can result from a/an _____.

Select one of the following:

  • low fluid viscosity around the shaft seal

  • overload on the pump motor

  • low fluid level in the reservoir

  • high oil level in the sump

Explanation

Question 112 of 112

1

The rate of fouling on the oil side of fuel heaters is directly related to the _______.

Select one of the following:

  • 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

Explanation

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