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WorksheetsPPD REVIEW PART II
Total questions: 81
Worksheet time: 48mins
Name
Class
Date
1.
Medium- and high-speed diesel engines operate mostly on ___________.
a)
two-stroke cycle
b)
four-stroke cycle
c)
four-cycle
d)
multi stroke
2.
These cylinder liner wear which is in form of local welding between particles of the piston ring and the liner rubbing surface, resulting in very rapid wear is known as ___________.
a)
Abrasion
b)
Adhesion
c)
Corrosion
d)
Frictional wear
3.
Fuel leakage in high-pressure fuel pipe between the injection pumps & fuel nozzle needs immediate repair because of ________________.
a)
clogging of the orifices
b)
distortion of the spray pattern
c)
high cost of fuel
d)
serious fire hazard
4.
Fitted to crosshead engines and vertical sliding bearing which locate and maintain alignment of the crosshead over the hole length of a stroke is the _____.
a)
Bushing
b)
Connecting rod
c)
Slide shoes
d)
Piston rod
5.
In a heat exhanger, where the cooling medium is seawater (SW) and fresh water (FW) is the medium to cooled, which of the following statement is true?
a)
SW pressure is higher than FW
b)
SW pressure is the same as FW
c)
FW pressure is higher than SW pressure
d)
SW and FW may at times higher than each other
6.
Draining your air reservoirs in the starting air system is important to ______.
a)
ensure there is enough pressure
b)
increase air efficiency
c)
check that the valve is operational
d)
removed accumulated water and oil
7.
Fuel on the system recirculates by the action of _____________.
a)
pressure control valve
b)
viscosimeter
c)
quick closing valve
d)
suction valve
8.
What part of the engine that has the function of measuring the speed and changing the fuel control?
a)
Generator
b)
Governor
c)
Indicator
d)
Injector
9.
What type of engine construction is involved if the cylinders are generally angle at about 45 degrees to each other and opposite pairs of cylinders are connected to the same crank?
a)
Crosshead construction
b)
Trunk type construction
c)
Opposite piston construction
d)
Vee type construction
10.
Fuel is admitted to a diesel engine cylinder through __________.
a)
injector nozzles
b)
intake valves
c)
exhaust ports
d)
carburetor
11.
a single cylinder, single acting , 305 mm x 460 mm, four stroke diesel engine was tested for an hour with a total revolution of 12,120. What is the rated rpm of the engine?
a)
3.37 rpm
b)
202 rpm
c)
12,120 rpm
d)
727,200 rpm
12.
The power available at the output of the shaft on a diesel engine is ________.
a)
Brake power
b)
Electric power
c)
Friction power
d)
Indicated power
13.
What procedure is advisable before a heat exchanger will be subjected for repairs, refitting, etc.?
a)
Drain the sea water side of heat exchangers
b)
Drain the fresh water side of heat exchanger
c)
Flush through with chemicals
d)
Clean and flush through with sea water
14.
What type of cylinder liner is use when the outside surface of the liner is in direct contact with water?
a)
Air cooled type
b)
Dry type
c)
Oil cooled type
d)
Wet type
15.
The direct cause of a crankcase explosion can be attributed to ___________.
a)
extremely hot scavenge air
b)
an overheated bearing
c)
faulty air cooler
d)
piston seizure
16.
Which statement describes a two-stroke cycle engine?
a)
It has short skirt of its piston.
b)
It has two-power stroke in every revolution
c)
The air inlet valve is in the cylinder cover
d)
The fuel ignites every time the piston is almost at TDC
17.
The vibration incurred by the main engine is transferred to the hull of the ship by the _______.
a)
cross head
b)
fly wheel
c)
reduction gear
d)
thrust bearing
18.
What part of a diesel engine that acts as an air compressor mostly driven by belt but sometimes with a chain or gear arrangement?
a)
Air cooler
b)
air intake manifold
c)
Turbocharger
d)
Supercharger
19.
Which term applies to the seawater supply system to fire hydrants fitted to every ship?
a)
fire main
b)
freshwater system
c)
sanitary seawater system
d)
seawater system
20.
What is the first thing to consider when about to start a large engine?
a)
Pressure of lube oil
b)
Pressure of seawater
c)
Temperature of fuel
d)
Temperature of jacket
21.
The main cause of scavenge fire is ______.
a)
too high oil mist content
b)
oil carried over to the starting air line
c)
damaged piston ring allowing blow by
d)
leaking/faulty fuel injection valve.
22.
The main purpose or of oil scraper ring is to __________-.
a)
seal the space between the piston and the liner
b)
reduce the amount of lube oil burned in the combustion chamber
c)
transmit the heat from the piston to the cylinder liner
d)
damp out fluctuations of the piston side thrust
23.
Why is it necessary to compress the air charge in the cylinders of a diesel engine?
a)
To ignite the fuel
b)
to increase fuel consumption
c)
To insure pumping losses are held to a minimum
d)
To keep exhaust temperature low
24.
In an internal combustion engine, which of the following is the basic of cycle?
a)
Exhaust
b)
Intake
c)
Power
d)
Scavenging
25.
It is the volume remaining between the piston & cylinder when the piston is at the top dead center.
a)
Clearance volume
b)
Displaced volume
c)
Swept volume
d)
Volume ratio
26.
In an engine parts exposed to extreme heat, which is necessary to retain its physical properties?
a)
Adequate cooling
b)
Adequate lubrication
c)
Enough clearance
d)
Enough ventilation
27.
A disk like piece attach to the shaft, a portion of which is circular, the remainder protruding beyond the circle used to import a desired motion to proper valve protruding is called ________.
a)
Bellows
b)
Cam
c)
Diaphragm
d)
Flywheel
28.
Which part of the engine fitted to isolate the power surface of the cylinder and scavenge box from the crankcase?
a)
A-frame
b)
Bedplate
c)
Crosshead
d)
Diaphragm
29.
In a four-stroke diesel engine, what event follows the compression of air in the cylinder?
a)
Exhaust stroke
b)
Ignition
c)
Injection of atomized fuel
d)
Power stroke
30.
What type of bearing is installed on the main bearing of a diesel engine?
a)
Ball
b)
Radial
c)
Roller
d)
Sleeve
31.
Normal temperature of inlet for jacket cooling water in the engine is _______ degree Celcius.
a)
40~45
b)
75~85
c)
95~98
d)
140~145
32.
Which of the following is used to hold the bed plate, frame, and entablature firmly together in compression?
a)
Main frame
b)
Steel frame
c)
Stud bolt
d)
Tie bolt
33.
In the distribution of heat balance in a four-stroke cycle diesel engine, which of the following has the least percent?
a)
Cooling water
b)
Exhaust gas
c)
Indicated power
d)
Radiation
34.
A possible cause why lube oil pump fails to build up discharge pressure could be __________.
a)
bypass valve is closed
b)
discharged valve is open
c)
suction valve is closed
d)
suction vacuum is high
35.
What property of fuel oil resists the force, which causes the fluid to flow?
a)
Flash point
b)
Heating value
c)
Specific gravity
d)
Viscosity
36.
Which is the process of evacuating the cylinder combustion products and replacing them with fresh air?
a)
Charging
b)
Scavenging
c)
Supercharging
d)
Turbo charging
37.
A diesel engine emits blue exhaust smoke due to __________.
a)
cold air intake
b)
excessive cylinder lubrication
c)
high compression pressure
d)
light load
38.
The single shaft of a turbocharger has a turbine on one end and a ______ on the other end.
a)
Bearing
b)
Blower
c)
Spring
d)
Valve
39.
The governor on a diesel engine controls crankshaft RPM by adjusting the _____.
a)
engine speed droop
b)
fuel injection pumps
c)
intake air supply
d)
turbocharger speed
40.
The intake ports of a two - stroke/cycle diesel engine are open and close by the action of the ______.
a)
camshaft
b)
exhaust valves
c)
piston movement
d)
vertical drive
41.
The process of pushing a large amount of air into the cylinder that is grater than the atmospheric pressure is called _________.
a)
air charging
b)
compressing
c)
turbocharging
d)
scavenging
42.
Which of the following is the reason why seawater is not use directly as engine coolant?
a)
corrosive action
b)
explosive effect
c)
hard to maintain
d)
low specific heat
43.
In an engine power the difference between indicated and brake power is called _________.
a)
Friction power
b)
Horse power
c)
True power
d)
Watt
44.
The piston rod scraper box incorporated in a two-stroke cycle, crosshead diesel engine serves to __________.
a)
Eliminate the necessity for an oil scraper ring
b)
Prevent sludge and dirty oil from entering the crankcase
c)
Prevent slide thrust and cylinder scoring
d)
Scrape oil and carbon deposit of the cylinder walls
45.
The purpose of the thrust bearing of a propulsion diesel engine is to ________.
a)
absorb vibrations in the propeller shafting
b)
control axial movement of the crankshaft
c)
transmit engine thrust to the proprller shaft
d)
prevent propeller thrust being transmitted to the hull
46.
Upon receiving on-hour notice for main engine, you should at once _______.
a)
start additional generator
b)
inform chief engineer and/or duty engineer
c)
turn the engine using turning gear
d)
inspect the engine room
47.
The most important factor in engine performance is the actual power output at the end of the crankshaft available for doing work. This is known as __________.
a)
Brake horsepower
b)
Friction horsepower
c)
Indicated horsepower
d)
Net horsepower
48.
An electric power plant is to have a 6-cylinder, 585 kW, 720 rpm, four stroke diesel engine with a mechanical efficiency of 87%. Calculate the indicated power.
a)
87.41 kW
b)
508.95 kW
c)
672.41 kW
d)
3,510 kW
49.
What is the arrangement of a trunk type engine?
a)
Gigh engine height
b)
High engine cost
c)
Cylinder liners close to crankcase
d)
Cylinder liners open to the crankcase
50.
If a four-stroke/cycle engine is running at 1600 RPM, the speed of the camshaft will be ______ RPM.
a)
600
b)
800
c)
1000
d)
1600
51.
Which type of packing is use in steam joints?
a)
Asbestos
b)
Copper gasket
c)
Diatherma packing
d)
Elastic packing
52.
The purpose of turning the diesel engine with indicator cocks open before starting is to ________.
a)
test the starting system
b)
ensure the proper lubrication of moving parts
c)
ensure thet water is not present in the cylinders
d)
ensure proper pre-heating of cylinder head
53.
A dark exhaust from a running diesel engine can be caused by ________.
a)
high compression temperature
b)
lack of air
c)
starting valve stuck open
d)
water in a fuel oil
54.
Which part of the diesel engine covers the cylinder where suction valve, exhaust valve, starting air valve and relief valve are located?
a)
Bedplate
b)
Cylinder head
c)
Cylinder block
d)
Piston rod
55.
What is the area of the piston if the diameter measures 0.75 m?
a)
0.43 meter squared
b)
0.44 meter squared
c)
0.53 meter squared
d)
0.54 meter squared
56.
Find mean effective pressure if the spring constant is 65 kPa/mm with a mean height diagram of 12.9 mm.
a)
5.04 kPa
b)
52.1 kPa
c)
77.9 kPa
d)
838.5 kPa
57.
What type of starting system used particularly for large diesel engine that requires considerable energy to start the engine?
a)
Air starting system
b)
Electric starting system
c)
Hand starting system
d)
Hydraulic starting system
58.
These cylinder wear may take place from the product of mechanical wear. corrosion and combustion, all of which form hard to removed known as ________.
a)
Abrasion
b)
Adhesion
c)
Corrosion
d)
Frictional wear
59.
A part of an engine where the air from the air cooler passes by way of non-return valves and into the cylinder as ports are uncovered by the piston is known as ___________.
a)
Air - inlet port
b)
Scavenge air trunk
c)
Super charger
d)
Turbo-charger
60.
What does scavenging mean?
a)
Injection fuel into the cylinder
b)
Forcing air into the cylinder under pressue after the exhaust valve has closed
c)
Forcing lubricating oil into the moving parts
d)
Taking exhaust gases out of the cylinder
61.
The single shaft of a turbocharger has a turbine on one end and a _________.
a)
Bearing on the other side
b)
Blower on the other end
c)
Spring on the other side
d)
Valve on top end
62.
What part of big diesel engine where burnt gases passes through before it reaches the funnel?
a)
Scavenging manifold
b)
Supercharger
c)
Air cooler
d)
Exhaust gas manifold
63.
Shime is placed in order to bring back the height of the piston to prevent ignition lag, this is being found ________.
a)
between piston skirt and piston crown
b)
between piston crown and piston rod
c)
between crosshead and connecting rod
d)
between crosshead and piston rod foot
64.
What type of scavenging process where the incoming air is directed upwards, pushing the exhaust gases before it, the exhaust gases then travel down and out of the exhaust ports which are big and located opposite the inlet ports?
a)
Uni-flow
b)
Multiflow
c)
Cross-flow
d)
Loop flow
65.
Which type of internal combustion engine ignites the fuel by injecting it into hot, high-pressure air in a combustion chamber?
a)
Diesel engine
b)
Gasoline engine
c)
Steam engine
d)
Steam turbine
66.
Which of the following part of diesel engine is used to reduce variations in the crankshaft rotating spreed during the engine cycle?
a)
intake port
b)
intake valve
c)
flywheel
d)
thrust bearing
67.
Which of the following part of diesel engine is to reduce variations in the crankshaft rotating speed during the engine cycle?
a)
Flywheel
b)
Propeler shaft
c)
Reduction gear
d)
Thrust bearing
68.
In bunker tanks, which of the following tanks is use in storing fuel ready for immediate use for starting up diesel engine?
a)
Double buttom tank
b)
Service tank
c)
Settling tank
d)
Sup tank
69.
A part of an engine that accomodates the cylinder liner; has spaces to accomodatecamshaft drice arrangement (chain or gear); housing for the camshaft and doors allowing access to the crankcase is known as ____________.
a)
Cylinder block
b)
Cylinder cover
c)
Bedplate
d)
A-frame
70.
Friction, engine wear, and oil consumption in a diesel engine can be directly attribute to the _______.
a)
acidity of the oil
b)
flash point of the oil
c)
pour point of the oil
d)
viscosity of the oil
71.
Calculate the friction power of the engine eith indicated power output is 190 hp and shaft power of 162 hp.
a)
28 kg/cm
b)
28 hp
c)
28 kW
d)
84.4 hp
72.
What must be done immediately in the event of hot spot or explosive conditions detected?
a)
Adjust lube oil pressure
b)
Continue with the operation
c)
Observe the temperature
d)
Slow down and stop the engine
73.
Which of the following is used to secure the main engine bedplate to the tank top?
a)
Allen screw
b)
Holding down bolt
c)
Hydraulic jack
d)
Tie bolt
74.
the turbocharger has two sides, namely __________.
a)
exhaust and inlet side
b)
turbine and the blower side
c)
turbine and exhaust side
d)
turbine and inlet side
75.
kPa is equivalent to _______.
a)
3 in of Hg
b)
3.06 mm of Hg
c)
43.52 psi
d)
2,250.2 bars
76.
A diesel engine indicator diagram has an area of 22 cm2 and a length of 12.5 cm. If the scale of the indicator spring is 1 mm = 1 kg/cm2, what is the cylinder mean effective pressure?
a)
17.6 kg/centimeter squared
b)
27.5 kg/centimeter squared
c)
34.5 kg/centimeter squared
d)
36.0 kg/centimeter squared
77.
When a pressure gauge reads zero, the absolute pressure is equal to ______psi.
a)
1.47
b)
4.17
c)
7.41
d)
14.7
78.
In a four-stroke cycle engine, what event follows the compression of air in the cylinder?
a)
Compression stroke
b)
Exhaust stroke
c)
Injection of fuel
d)
Power cycle
79.
Which engine component admits air to open the starting valve of the cylinder, which is in starting position with respect to the direction of rotation?
a)
Air control valve
b)
Distributor
c)
Servomotor
d)
Starting air cam
80.
Which term refes to the distance traveled by the piston between its extreme points?
a)
Cycle
b)
Revolution
c)
Stroke
d)
Turn
81.
which of the extinguishing agent use for combating scavenging fire?
a)
Carbon monoxide
b)
Dry chemical
c)
Foam
d)
Steam
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