更多"It is not surprising if in these co"的相关试题:
[单项选择]Messages concerning weather conditions transmitted by radiotelephone are preceded by（）.
A. MAYDAY
B. PAN-PAN
C. SECURITE
D. SOS
[单项选择]Given the high price,（） it's not surprising they didn't buy it.
A. and
B. but
C. –（不填）
D. that
[单项选择]Which general weather conditions should you expect to find in a low pressure system（）.
A. Fair weather
B. Precipitation and cloudiness
C. Scattered clouds at high elevations
D. Gradual clearing and cooler temperatures
[单项选择]Weather conditions in the middle latitudes generally move（）．
A. Eastward
B. Westward
C. Northward
D. Southward
[单项选择]When under maneouvring conditions with the machinery being manually operated the control unit or console should be （）
A. automatically controlled
B. continuously manned
C. off power
D. none of the above is true
[单项选择]Which of the following operational conditions will occur to the diesel engine lube oil at extremely high temperature?（）
A. The oil oxidizes and forms carbon deposits
B. The viscosity increases
C. Engine oil consumption decreases
D. Lubricating qualities of the oil are enhanced
[单项选择]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. Block cooling water passages to the head
D. Excessive scavenging air provided to the engine
[单项选择]Under normal conditions a liferaft is released from itscradle by（）.
A. cutting the restraining strap
B. unscrewing the turnbuckle on the back of the cradle
C. lifting one end of the raft
D. pushing the plunger on the center of the hydrostatic release
[单项选择]The three conditions which cause engine shutdown are overspeed，low lube oil pressure，and（）.
A. High lube oil pressure
B. High jacket water pressure
C. High jacket water temperature
D. Low jacket water pressure
[单项选择]Which of the following conditions will develop if the flow of ‘raw’ cooling water to diesel engine is obstructed?（）
A. Air will enter the cooling system
B. Carbon will plug the water cooled exhaust manifolds
C. The jacket water temperature will rise
D. The lube oil viscosity will increase
[单项选择]Which of the listed conditions will affective pressure the most in the cylinder of a diesel engine?（）
A. TBN of the lubricating oil
B. Temperature of the lube oil
C. Completeness in the mixing of the fuel and air
D. Temperature of the cooling (sea) water
[单项选择]Which of the following conditions would cause carbon deposits to form in the piston ring belt of a diesel engine?（）
A. faulty combustion
B. excessive ring temperature
C. over lubrication
D. all of the above
[单项选择]Operating conditions in the crank chamber are very （） those in the cylinder.
A. the same as
B. similar to
C. separated from
D. different from
[单项选择]Which of the following conditions indicates the dilution of diesel engine lube oil by fuel oil?（）
A. Water discharging from the water outlet of the lube oil purifier
B. Fuel oil discharging from the water outlet of the lube oil purifier
C. Lube oil discharging from the water outlet of the lube oil purifier
D. A change in the lube oil viscosity
[单项选择]Which of the following conditions can cause above normal air temperature to develop in the intake manifold of a four-stroke/cycle turbo-charged diesel engine?（）
A. Clogged air intake falters
B. Piston blow-by
C. A defective after-cooler
D. Faulty exhaust valves
[单项选择]Which of the following operating conditions can occur when shims are removed from the joint between the foot of a marine type diesel engine connecting rod and the bearing box?（）
A. Decreased connecting rod bearing clearance
B. Increased connecting rod bearing clearance
C. Decreased compression ratio
D. Increased compression ratio
[单项选择]Which of the following conditions is true concerning a flammable liquid with a concentration above the upper explosive limit?（）
A. The mixture is too lean to burn
B. The mixture is too rich to burn
C. The vapor is about to explode
D. Conditions are perfect for combustion
[单项选择]Which of the following conditions can cause below normal air pressure in the intake manifold of a turbocharged diesel engine?（）
A. Excessive piston blow-by to the manifold
B. Insufficient cooling water flow
C. Accumulated water in the air boxes
D. Clogged air intake filters
[单项选择]Which of the following conditions could cause the feed pump for an auxiliary boiler to lose suction?（）
A. Increased suction head pressure
B. Decreased feedwater temperature
C. Pump recirculating line being open too much
D. Excessive feedwater temperature
