13.Fuel droplets injected into a diesel engine cylinder must have adequate penetration to _____________.
A.prolong the ignition delay period
B.ensure the beginning of fuel injection
C.thoroughly utilize the air charge
D.allow controlled fuel combustion
14.Loss of lubricating oil pressure to the main propulsion diesel engine will actuate a/an _____________.
C.the ships/boats general alarm
D.reserve oil storage tank
15.The amount of fuel injected into a cylinder by a unit injector is controlled by _____________.
A.the firing pressure in the cylinder
B.a metering helix
C.varying the length of the plunger stroke
D.varying the clearance between the injector cam and the injector rocker arm
16.The dripping of fuel from an injector nozzle after injection terminates, often results in ____________.
B.incomplete combustion and decreased fuel consumption
C.coking and blocking of the fuel nozzles
D.decreased cylinder wall temperatures and increased exhaust gas temperatures
17.The amount of fuel delivered for each cycle must be in accordance with the engine load, and the same quantity of fuel must be delivered to each cylinder for each power stroke at that load. Which of the following statements describes this requirement?
C.Suitable injection rate
D.Suitable atomization rate
18.The knock occurring when a cold diesel engine is started and continues while running at low speed, but stops when the engine reaches normal operating speed and temperature, is _________________.
A.caused by retarded injection timing
B.caused by a mechanical defect in one cylinder
C.caused by high fuel injection pressures
D.normal for these conditions
19.The most crucial time for any bearing with regards to lubrication is _____________.
A.during low loads
B.after proper oil viscosity is reached
D.after cleaning filters
20.Which of the listed diesel engine operating conditions should be checked immediately after any diesel engine is started?
B.Lube oil level
C.Lube oil pressure
D.Water level in the expansion tank