NEW
Font size
WorksheetsDiesel Plant
Total questions: 55
Worksheet time: 28mins
An engine in which the fuel is burned directly within the working cylinder.
internal combustion engine
external combustion engine
compression ignition engine
spark ignition engine
An engine in which the fuel is burned outside of the power cylinder.
internal combustion engine
external combustion engine
compression ignition engine
spark ignition engine
An engine where the ignition is caused by heat of compression.
internal combustion engine
external combustion engine
compression ignition engine
spark ignition engine
What temperature is required to ignite the fuel oil?
800 to 1000 F
700 to 900 F
900 to 1100 F
1000 to 1200 F
What air pressure is required to produce the required ignition temperature?
350 to 500 psi
250 to 400 psi
450 to 600 psi
150 to 300 psi
In a four stroke Diesel engine, drawing air into the cylinder is what stroke?
first stroke
second stroke
third stroke
fourth stroke
Compressing air in a four stroke cycle is
first stroke
second stroke
third stroke
fourth stroke
Which of the following strokes is produced by the burning gases?
first stroke
second stroke
third stroke
fourth stroke
Which of the following strokes expels the burned gases?
first stroke
second stroke
third stroke
fourth stroke
Clearing a cylinder of exhaust gases by forcing into it a current of air which provides clean air for the next compression stroke.
scavenging
supercharging
choking
knocking
Increasing the total amount of charging air in the working cylinder of the engine.
scavenging
supercharging
choking
knocking
The portion of the piston which extends below the piston pin and serves as a guide for the piston and connecting rod.
piston skirt
piston ring
piston scoring
piston seizure
Rings located in the grooves of the piston usually near the top and near the bottom.
piston skirt
piston ring
piston scoring
piston seizure
Binding of the piston and the cylinder wall as a result of the lubrication having been destroyed by excessive temperature and friction.
piston skirt
piston ring
piston scoring
piston seizure
Grooves in the cylinder wall or piston or in both. It is caused by the piston scraping the cylinder wall in its movement without proper lubrication.
piston skirt
piston ring
piston scoring
piston seizure
A device which automatically governs or controls the speed of an engine.
servomotor
governor
indicator
speedometer
A combination of liquids which do not mix or combine chemically.
emulsion
deposition
evaporation
separation
What temperature should be the maximum to which lubricating oil is permitted to rise?
not more than 100 F
not more than 200 F
not more than 300 F
not more than 400 F
What air pressure is needed for air starting a Diesel engine?
250 psi
150 psi
350 psi
450 psi
At what temperature will self igniting cartridges ignite?
About 200 F
About 190 F
About 210 F
About 250 F
The fuel is supplied by one pump and switched to each cylinder by a multi outlet rotating valve or distributor.
distributor system
injector system
non injector system
non distributor system
This is virtually a distributor two stage pumping system, that is, modified distributor system.
distributor system
injector system
A chamber so proportioned with respect to the clearance volume proper of the cylinder that only about 30% of the combustion takes place within the chamber itself.
pre combustion chamber
separate combustion chamber
ante combustion chamber
mixed combustion chamber
The entire charge is ignited in the separate combustion chamber before the initial expansion takes place, forcing the burning gases through the connecting passages and against the moving piston.
pre combustion chamber
separate combustion chamber
ante combustion chamber
mixed combustion chamber
A chamber so designed that injection takes place directly opposite its outlet, the chamber extending backward from the outlet.
pre combustion chamber
separate combustion chamber
ante combustion chamber
air cell chamber
Fuel is injected only into the main cylinder, during expansion of the burning gases in the main chamber, when the pressure therein drops below that of the air in the cell.
pre combustion chamber
separate combustion chamber
ante combustion chamber
air cell chamber
What is the temperature of the air in the cylinder when the Diesel engine is operating at full load?
between 800 and 1100 F
between 800 and 1000 F
between 900 and 1200 F
between 900 and 1100 F
What are the exhaust gas temperatures at normal operating conditions?
between 400 and 700 F
between 500 and 800 F
between 300 and 600 F
between 200 and 500 F
How are high speed Diesel engines started?
by an electric motor
by compressed air
by a diesel fuel
by an electric spark
What speeds are considered high speed diesel engine?
100 to 2000 rpm or 3000 rpm
100 to 1000 rpm
100 to 1500 rpm
100 to 1750 rpm
It is a device used for atomizing or cracking fuel oil and through which the fuel oil is injected into the working cylinders of Diesel engines.
atomizer
fuel spray nozzle
injector
cracker
What is the proper seat width of a spray valve?
1/16 in.
1/8 in.
1/32 in.
1/4 in.
A cylindrical vessel connected in the fuel system to absorb the shock of the injection pumps and to provide a reservoir at high pressure for supplying an even flow of fuel oil to the cylinders.
absorber
accumulator
governor
injector
How hot are the exhaust gases?
400 to 700 F
300 to 600 F
200 to 500 F
500 to 800 F
Which of the following is an automatic device used for keeping constant air pressure?
relief valve
unloader
strainer
barometer
What is the other term of the diameter of the circular cylinder?
bore
stroke
swept volume
clearance
What do you call the maximum distance traveled by the piston?
bore
stroke
swept volume
clearance
Which of the following is the product of the cylinder area and stroke.
bore
stroke
swept volume
clearance
The ratio of the clearance volume to the swept volume.
fractional clearance
compression ratio
expansion ratio
cut off ratio
The piston is at maximum reach from the crankshaft to which of the following?
top dead center
bottom dead center
3/4 from top center
3/4 from bottom center
The piston is closest to the crankshaft to which of the following?
top dead center
3/4 from top center
bottom dead center
3/4 from bottom center
Which of the following engines where the expanding combustion gases act on one end of the piston?
single acting engine
double acting engine
single expansion engine
double expansion engine
Which of the following types of engine where the expanding combustion gases act on both ends of the piston?
single acting engine
double acting engine
single expansion engine
double expansion engine
The compression ratio of a Diesel engine varies from about
13.5 to 17.5
14 to 19
8 to 10
10.5 to 14.5
In standard Diesel, thermal efficiency was not much higher than about what percent?
35 %
40 %
30 %
50 %
A closed heat exchanger that transfers heat from compressed air to cooler air.
regenerator
aftercooler
intercooler
reheater
Which of the following is used to improve cold weather starting?
poppet valve
check valve
glow plug
spark plug
The rated power that the manufacturer claims the engine is able to provide on a continuous basis without incurring damage.
brakepower
continuous duty rating
intermittent rating
power rating
What is the peak power rating that can be produced on an occasional basis?
brakepower
continuous duty rating
intermittent rating
power rating
Which of the following is the value of a property that includes the effect of friction?
brake value
friction value
indicated value
actual value
Which of the following is NOT the cause of black smoke in diesel engine?
fuel valve open too long
carbon in exhaust pipe
high compression pressure
overload on engine
Which of the following is not a method of starting a diesel engine?
Manual: rope, crank and kick
Compressed air
Electric (battery)
Using another generator
Two-stroke engine performs ______ to complete one cycle.
suction and discharge stroke
compression & power stroke
power and exhaust stroke
suction and exhaust stroke
If the cut-off ratio of diesel cycle increases, the cycle efficiency will ______
decrease
remains the same
increase
none of these
For the same heat input and same compression ratio:
both Otto cycle and Diesel cycle are equally efficient
Otto cycle is less efficient than diesel cycle
efficiency depends mainly on working substance
none of the above is correct
