Plugged injector nozzles
Excessive fuel injection
Very late injection timing
Incorrect crankshaft clearance
第1题：
Which of the following conditions could contribute to the cracking of a diesel engine cylinder head?
A.Leaking seal ring
B.Insufficient heat transfer from the exhaust valves
C.Blocked cooling water passages to the head
D.Excessive scavenging air provided to the engine
第2题：
Excessive cylinder liner
water in the fuel system
Cracked cylinder liner
Leaking lube oil cooler
第3题：
Which of the conditions listed will cause a refrigeration compressor to run constantly without simultaneously decreasing the temperature in the refrigerated space?( )
A.Shortage of refrigerant oil
B.Slight shortage of refrigerant
C.Excessive condenser cooling water flow
D.Faulty expansion valve
第4题：
Shortage of refrigerant oil
Slight shortage of refrigerant
Excessive condenser cooling water flow
Faulty expansion valve
第5题：
Glazing of the cylinder liners
Increase valve wear
Excessive oil pumping
Increase fuel consumption
第6题：
Which of the problems listed could cause erosion of the expansion valve disks and seats?
A.Overcharging the system with refrigerant
B.Faulty compressor suction valve
C.Failure of the high pressure cutout
D.Flash gas formed in the liquid line
第7题：
cold fuel oil
low fuel oil pressure
low atomizing steam pressure
water in the fuel oil
第8题：
Which of the listed conditions can be considered as the single greatest cause of accidents?
A.Speed
B.Excessive knowledge or skill
C.Human error
D.Excitement
第9题：
Improper fuel rack positioning
Lengthy opening of the exhaust valve
Excessively early injection timing
Extended light load operation
第10题：
clogged air filter
compression stroke
burned exhaust valves
all of the above