OBJECTIVE QUESTIONS (MAIN ENGINE)

1. If water is found in the crankcase of a diesel engine, the cause may be due to
A	cracking of cylinder head
B	leaky cylinder head gasket
C	cracking of cylinder liner
D	all of the above                                                                                                                     answer D

2. Oil accumulating in the exhaust piping or manifold of a diesel engine can be caused by
A	worn valve guides
B	excessive crankcase vacuum
C	damaged hydraulic valve lifters
D	excessive lube oil pressure                                                                                                answer A

3. The function of the after coolers installed in the diesel engine air intake system is
A	decrease air density
B	increase air density
C	increase the scavenge air temperature
D	increase the lube oil temperature                                                                                      answer B

4. Piston cooling fins are located
A	top of the piston crown
B	beneath the piston crown
C	base of the piston skirt
D	inside the cylinder liner cooling water jacket                                                                   answer B

5. A seven cylinder, two-stroke/cycle, single acting diesel engine with a cylinder indicated horsepower calculated as 1350 kW and brake horsepower measured at 7466 kW has a mechanical efficiency of
A	18%
B	58%
C	79%
D	84%                                                                                                                                        answer C

6. Diesel engine exhaust gas temperatures can be used to determine individual cylinder
A	horse power output
B	fuel oil consumption
C	lube oil consumption
D	performance                                                                                                                          answer D

7. Two important considerations to maintain proper lubrication of a diesel engine include the delivery of oil in sufficient amount along with an acceptable
A	pour point
B	viscosity index
C	cetane number
D	specific gravity                                                                                                                      answer B

8. Which of the following conditions is indicated by the presence of water in the scavenging air receiver?
A	leaking cylinder head gaskets
B	leaking after cooler
C	excessively high scavenge air temperature
D	auxiliary blower failure                                                                                                       answer B