Quiz #6: Q. 151-175 Flashcards
Control of the fuel oil metering valve in an automatically fired auxiliary boiler is accomplished by a __________.
steam pressure sensing device with linkage to the damper air vanes
If the cooling water temperature and the lube oil temperature in a diesel engine are too high, the cause can be __________.
excessive wear of the cooling water pump
If the raw water supply pressure for a diesel engine cooling system is below normal, you should check for a __________.
clogged sea strainer
Antifreeze solutions containing ethylene glycol, should not be mixed with corrosion protection oils, as the resultant mixture __________.
may cause frothing
In a closed cooling water system, which of the following problems can cause the water pressure to fluctuate?
A An open vent in the cooling system.
B A restricted water passage in the engine.
C A fouled sea chest.
D Air entrained in the cooling water.
D Air entrained in the cooling water.
How is the illustrated strainer element cleaned during engine operation? Illustration MO-0057
The T-handle is rotated
In a normally operating diesel engine, the main source of lubricating oil contamination in the crankcase is a result of the __________.
combustion by-products removed from the cylinder walls
A dirty diesel engine oil filter element can best be detected by __________.
the pressure drop across the filter
The color of the diesel engine detergent type lube oil in an operating diesel engine is black, this indicates __________.
normal oil condition
A dirty lube oil strainer can result in \_\_\_\_\_\_\_\_\_\_. A crankcase dilution B low lube oil temperature C low bearing oil pressure D excessive oil consumption
C low bearing oil pressure
When a leak has developed in the lube oil cooler of an operating diesel engine, which of the listed operating conditions can be expected to occur?
A Lube oil level decreases
B Lube oil level increases
C Lube oil contaminated with fresh water coolant
D Lube oil contaminated with saltwater
A Lube oil level decreases
Scale and dirt accumulation in the waterside of a lube oil cooler will be indicated by a gradual increase in the lube oil __________.
temperature
On small diesel engines, a noticeable decrease in the time interval between the replacement of the lube filter cartridge indicates __________.
piston ring blow-by
In an operating diesel engine, pre-ignition can be caused by __________.
oil in the air charge
Irregular engine speed in a diesel generator can be caused by __________.
binding in the fuel control linkage
If fuel oil were being discharged from the waste water outlet of a fuel oil disk type centrifuge, operated as a separator, you should __________.
re-prime the purifier with sealing water
A modern centrifuge, similar to the device shown in the illustration, is opened for periodic cleaning. The most common cause of operating failure after reassembling, is due to __________. MO-0012
not replacing the bowl O-rings that have taken a permanent set
Heat damage to fuel injection nozzles can be prevented by avoiding __________.
long periods of engine overload
One cause of diesel engine surging can be a result of __________.
A injection pump fuel rack binding or sticking
B low compression
C solenoid stuck open
D fuel booster pump pressure too high
A injection pump fuel rack binding or sticking
Which of the following problems can occur if you continually fail to drain off condensate from a starting air receiver?
Corrosion and eventual failure of the tank.
On a diesel engine with direct-cylinder admission air starting, a leaking air starting valve would be indicated by __________.
an overheated starting air supply pipe
Which of the following conditions is most likely to occur if the electric starter motor pinion gear fails to disengage from the flywheel of a diesel engine after the engine has started?
A Engine will stop
B Starting motor will dangerously over-speed
C Flywheel will be damaged
D Combustion gases will enter the air starting system
B Starting motor will dangerously over-speed
When starting air is admitted, a diesel engine turns over very slowly without firing. The cause may be __________.
low starting air pressure
When an additional load is applied to a diesel engine which is using an inadequately inflated air bladder clutch unit, you can expect __________.
overheating because of slipping shoes
Misalignment of the drive shaft and propeller shaft flanges can be detected by using a dial indicator or __________.
feeler gauge
