Comp 4 part 4
Marine Engineering Systems Quiz
Test your knowledge on marine engineering systems with our comprehensive quiz! This quiz comprises 66 multiple-choice questions that cover various aspects of air conditioning systems, fuel oil, refrigeration, and more.
Whether you're a professional in the field or a student looking to enhance your understanding, this quiz is designed for you. Key features include:
- Wide range of topics
- Detailed questions
- Multiple-choice format
In the relation to air conditioning system, where is the latent heat of water vapor depends>
Wet bulb temperature
Dry point
Dry bulb temperature
Dew point
An oil mist detector is used to detect an oil mist formation in the diesel engine crankcase. Which of the following causes oil mist formation?
Low oil pressure
Low oil level
Dirty oil
Overheating of oil
Salinity cell is installed in the distilling unit to indicate the ?
Quality of water produced
Quantity of freshwater produced
Leaking tube
Amount of chemical to be added
How does the power transfer from the engines located deep inside the hull of a vessel to the propeller at the aft. The answer lies in an integral mechanical component known as_____.
The marine shaft or propeller shaft
The tail shaft
The thrust shaft
The intermediate shaft
In the refrigeration system the refrigerant absorbs the latent heat of vaporization in the ?
Condenser
Compressor
Evaporator
Liquid receiver
Which significant combustion element of fuel oil is major source of air pollution?
Carbon monoxide
Carbon
Sulphur
Hydrogen
In the refrigeration system, the heat normally producing the flash gas at the thermostatic expansion valve, is obtain from__.
The portion of liquid refrigerant which does not flash
Exposure to the high ambient temperature within the coil
Exposure to the high ambient temperature of the cooled space
The hot as bypass connection at the three way valve
Inspection of the a low pressure gear pump for cavitation will usually be indicated by wear pattern?
Even throughout the entire periphery of housing when matched machine gear sets are used
At the extreme upper and lower peripheries of the housing
Along the inlet side of the housing
Along the discharge side of the housing
Which of the items listed below is normally describe a ventillating fan?
Centrifugal
Axial flow
Positive displacement
Rotary vane
The firing rate of the boiler using steam atomization is indicated by the ?
Steam atomizing pressure
Fuel oil return pressure
Fuel oil supply pressure
Burner register opening
In a main propulsion turbine installation the condensate pump initially discharge to the ____.
Air ejector condenser
Distillate tank
Dearating feed tank`
First stage heater
What is the cause of fuel oil accumulation in boiler casing is ?
Leaking fuel oil strainer
High atomizing steam pressure
Dripping atomizers
Faulty steam return traps
Rapid fluctuations of absolute pressure in the last effects of a multi-effect submerged tube distilling plant will tend to cause?
Scale formation with increase heat transfer
Slight foaming at the distillate feed pump
Priming with increased salinity of distillate
Improved operating conditions at the brine pump
An advantage of a helical gear pump over a simple gear pump is that the helical gear pump is capable of ?
Maintaining a steadier speed
Producing a smoother discharge flow
Delivering liquids over greater distances
Operating for longer period of time
An internally mixed steam atomizer requires which of the following compared to a return flow oil burner system?
Higher air velocity
High fuel viscosity
Less excess air
Greater turbulence in ari/oil stream
An inadequate reciprocation bilge pump discharge is most often caused by ?
Scarred cylinder walls
Clogged drain valves
Clogged suction strainner
Defective intake valves
What type of engine uses a high cetane number ?
Large, medium speed
Large, slow speed
Small, medium speed
Small, high speed
Which items on the list could reduce high salinity in steaming boiler?
Using the continuous blowdown
Adding calcium carbonate to precipitate solid
Steaming at low firing for 24 hours
Adding hydrazine to control dissolved oxygen
Which of the following is a function of a burner atomizing steam"?
Impart swirling motion of the oil efficient combustion
Maintain a constantly high fuel pressure
Maintain a constant high fuel temperature
Prevent overheating of the atomizer
What is the simplest method used for determining if a centrifugal pump is operating as designed?
Close off the discharge valve, and watch for a rise in pressure
Closely observe the pump discharge temperature
Use a clamp on ammeter and compare the readings to past records
Momentarily close off the suction valve, and watch for a rise in pressure
A reading of zero on a bourdon tube instrument generally means ?
Equal to atmospheric pressure
Absolute zero
Absolute vacuum
Near absolute zero
Which of the following is the possible cause of fluctuating steam pressure of atomizing steam pressure of atomizing steam system is?
Partially closed atomizing steam valve
Ruptured steam passage in the boiler burner
Incorrectly assembled burner tip
Malfunctioning of steam traps in the atomizing steam
One of the main functions of wearing rings, as used in a centrifugal pumps is to_.?
Allow for economical replacement of worn internal pump components during regular overhaul maintenance
Prevent water leakage to the atmosphere
Maintain radial alignment between the pump impeller and casing
Absorb all impeller shaft end thrust
What is the most effective method in removing water from diesel fuel oil?
By straining the fuel
By using it in the engine
By heating the fuel tanks
By centrifuging the fuel
What is known as an air motion induced in four-cycle diesel engine cylinder to improve air fuel mixing?
Swept volume charging
Scavenging
Super charging
Turbulence
Irregular feeding or surging of the feedwater supply to a low pressure distilling plant may be attributed to___.
A dirty strainer in the saltwater feed pump suction line
A clogged vent line from the air e
Erratic water flow through the air educator
Excessive pressure in the seawater feed heater
In an electric-hydraulic steering gear any change in relative position between synchronous receiver and the follow-up gear result in____.
Driving the rams up against the stops
Closing of the six-way valve
A corresponding slowing or increasing of the pumped flow rate
The pump going to full stroke
Which of the following cases listed should soot blowing be applied to avoid soot fire?
Prior to wet cleaning
Prior to dry cleaning
Prior to an increase in power
Prior to engine air intake
If condensate is accumulated in the steam side of a fuel oil heater, it could result in ?
Overheating
Scale accumulation
Corrosion
Immediate oil contamination of the condensate
The capacity of a rotary pump, delivering a constant viscosity fluid, will decrease when the discharge pressure is increased due to?
Decreased suction pressure
Reduced slippage
Increased slippage
Increased suction pressure
An internal bypass is provided on some hydraulic system suction strainer to help reduce the possibility of?
Contamination of the oil
Pump cavitations
Spongy actuator movements
Aeration of the oil
In an engine operation what is the effect called that describe the unstable operation of the governor that will not maintain a steady state condition?
Deadbeat
Hunting
Sensitivity
Stabilily
The function of seal cages or lantern rings installed in the centrifugal pump stuffing boxes is to___.
Distribute the sealing liquid within the stuffing box
Lubricate the packing
Cool the shaft
Seal air from entering along the shaft
Regarding the low pressure evaporator steam control orifice in the live steam supply line, the steam at the outlet of the orifice if not properly conditioned will be developed as?
Desuperheated steam
Poor quality steam
Saturated steam
Superheated steam
In hydraulic system with an increase in temperature, what will happen to the volume of hydraulic fluid ?
Remains constants if pressure decreases
Contracts
Remain the same
Expand
Dirty condenser in a refrigeration system would indicate ?
High pressure discharge
Drifting
Emulsifying
Flooding
Which of these bearing listed below is preferred by makers for use in the engine room supply blowers?
Ball
Thrust
Roller
Sleeve
Before loosening pump covers how should the pressure be checked ?
Remove drain plug
Air vent valve open and clear
Checking the pressure gauge
Remove cover slowly
The oil scraper ring of a 4-stroke engine piston is installed at this part?
3rd ring
Middle ring
Top ring
Lowest ring
In flash type distilling unit, which of the following first absorbs heat from the evaporator feed ?
Saltwater heater
Distillate cooler
Vapor feed heater
Air ejector condenser
If the existing vapour presure is subtracted from the indicated pressure at the pump suction, the remainder is the ?
Discharge head
Total suction head
Apparent net positive suction head
Pump head
Sub-cooling is the method of reducing the temperature of the liquid refrigerant below its?
Condensing temperature
Freezing point
Floc point
Compression pressure
An eccentric reducer , used as a transition piece between a centrifugal pump suction flange and the suction piping flange, must be installed with the eccentric portion below the suction pipe centerline to___?
Allow sediments to settle on the bottom
Reduce vapour pressure of the water entering the pump suction
Slope the suction line upward the pump
Prevent the formation of air pocket
Which of the following terms is used to identify the pressure of the liquid ?
Suction head
Discharge head
Pump head
Total head
Centrifugal pumps, used to handle hot liquids, must have minimum flow through them under all operating condition, this flow serves to>
Maintain the net positive head of the pump
Maintain hydraulic differential in the pump impeller passage
Keep the shaft glands cool
Prevent overheating and vapour bound conditions
What is the purpose of the boiler drum air cock ?
Permit escape of steam in the drum after lighting off
Admit air when the boiler is being emptied
Permit escape of air when steam is forming in the drum after lighting off
Permit escape of air when the boiler is being filled
Which of the following admits air to the piston of a cylinder relay valves in a correct sequence for engine starting?
Starting air valve
Brake-air valve
Reversing air valve
Starting air distributo
In a refrigeration system the amount of refrigerant admitted to the evaporator is directly related to___
Condenser cooling water temperature
All warding file the compressor discharge pressure
The solenoid valve differential pressure
The superheat of the refrigerant in the tail coil
A squeaking sound occurring from within an operating reciprocating air compressor is an indication of ?
Compressor overload
Motor overloard
Light compressor bearings
Badly leaking unloader
a distorted spray pattern from fuel injector can cause a diesel engine to have?
Less power output
Higher firing pressure
Lower fuel pressure
More power output
Passages are drilled at the diesel engine crankshaft in order to provide lubricating oil in the ?
Cooling water pump outlet
Piston rod bearings
Jacket water output
Heat exchanger outlet
What cause carbon deposits on the boiler throat ring/
Too much excess combustion air
A faulty ignition electrode
The burner cycling on and off
A dirty atomizer sprayer plate
Excess refrigerant in a refrigeration system is normally removed from the ___.
Suction side of the system
Discharge side of the evaporator
Charging connection of the system
Compressor crackcase
What can be found when subjecting a metal to an axial?
Elasticity
Breaking strength
Strength
Main haul
Increasing the valve clearance of diesel engine intake valve will cause the valve to open?
Later and have less duration
Earlier and remain open longer
Earlier and have greater lift
Later and have greater lift
A pounding noise in steam cylinder in a mooring winch could be caused by?
Leaky packing
Low winch load
Excessive bearing clearance
Low steam pressure
Integral water jacket liner use O-ring near the bottom of the liner. These O-ring serves to?
Prevent the escape of lubricating oil from the crankcase
Form a water seal between the liner and engine block
Ensure proper temperature flow between the liner and engine block
Allow for sight misalignment of the liner
The average pressure exerted on a piston during each power stroke is termed __.
AA exhaust back pressure
AA compression pressure
Mean effective pressure
AA indicated horsepower
Parts of the pump use to maintain the alignment of the pump are ?
Bearings
Lantern ring
Wear ring
Impeller
How do you control freshwater heating temperature in the evaporator side of the fresh water generator?
Regulate vent valve
Regulate inlet valve
Regulate by-pass valve
Regulate outlet valve
The bore of a diesel engine describe the ?
AA height of the piston
AA volume of the cylinder
AA diameter of the cylinder
AA length of the piston ron
If you were operating a centrifugal water service pump with worn wearing rings, the ___.
Pump would vibrate excessively
Pump would develop insufficient flow
Pump would be very noisy
Stuffing box would leak excessively
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