更多"Which is not the maintenance work f"的相关试题:
[单项选择]The cooling system（） needs least maintenance work for in this kind of system（）
A. open；the minimum components
B. open；the high cooling efficiency
C. central；there are more coolers and a extra set of pumps
D. central；there is only one component contacts seawater
[单项选择]Which maintenance functions can a GMDSS Radio Operator perform（）.
A. The Operator can make fine internal adjustments to the transmitter as long as the output power does not change by more than one percent
B. The Operator is responsible for ensuring that INMARSAT antennas are free of built-up soot and clear of obstacles
C. All levels of maintenance must be performed by a licensed GMDSS Radio Maintainer
D. The Operator may install an EPROM in order to ensure that the equipment continues to operate within legal constraints
[单项选择]Which of the routine maintenance procedure listed is required for starting air receivers?（）
A. Frequent draining of accumulated moisture
B. Frequent testing of relief valves
C. A close watch on temperature to prevent fluctuations in pressure
D. Frequent cleaning to re move oil and foreign matter
[单项选择]Which of the routine maintenance procedures listed is required for starting air receivers?（）
A. over-speeding
B. overload
C. low exhaust temperature
D. high crankcase pressure
[单项选择]You are inspecting the lower main precision bearings on a diesel engine.You observe that about half the thin Babbitt linings are of a milky white colourThis condition is caused by （）
A. large dirt particles in the oil supply
B. insufficient lubricating oil and overheating
C. normal wear
D. water contamination of the lube oil
[单项选择]Which statement is TRUE concerning the tandem working arrangement of pedestal cranes when completing a quad lift? （）
A. The discharge is slow due to the size of the cargo and all the cranes working together
B. The cargo discharge can be accomplished with controlled pendulation
C. The cargo discharge can be performed in port or at anchor
D. The cranes enable the handling of heavy cargos without shoreside assistance
[单项选择]A vessel’s position should be plotted using bearings of（）.
A. buoys close at hand
B. fixed known objects on shore
C. buoys at a distance
D. All of the above
[单项选择]Where a propeller shaft passes through the hull，water is prevented from entering by means of a（）.
A. stuffing box
B. propeller boss
C. seacock
D. stop-water
[单项选择]Preventive maintenance （）.
A. should not be carried out during the watches
B. can only be carried out in port
C. is a kind of maintenances carried out prior to the occurrence
D. is a kind of maintenances carried out after the occurrence
[单项选择]Before doing maintenance on electrical equipment, you should （）.
A. turn off power first
B. turn on power first
C. with a test pen in hand
D. tell C/E
[单项选择]The shaft and spare parts（） should be well greased in order to avoid corrosion.
A. in the store room
B. in the cylinder
C. in the scavenge air box
D. in the water box
[单项选择]Misalignment of the drive shaft and propeller shaft flanges can be detected by using a dial indicator or （）.
A. inside micrometer
B. feeler gauge
C. adjustable trammel
D. sighting device
[单项选择]The （） of the main shaft should be measured with a （）.
A. clearance；calipers
B. sinking；bridge gauge
C. diameter；bridge gauge
D. clearance；lead wire
[单项选择]The projection on a shaft designed to change circular motion into up and down or back and fore motion is called （）.
A. wheel
B. crankshaft
C. running gear
D. cam
[单项选择]Leakage of hydraulic fluid from around the shaft of a hydraulic motor may be caused by（）
A. permanent loss of pump suction
B. worn shaft seals
C. high level in the oil sump
D. low motor RPM
[单项选择]Air leakage between the shaft and stuffing box packing in a centrifugal pump is prevented by （）.
A. a compressed packing gland
B. lantern tings between the packing rings
C. a liquid seal
D. the stuffing box gland
[单项选择]Shaft sealing in a centrifugal pump can be effected by （）.
A. the mechanical seal
B. packed stuffing boxes
C. either A or B
D. neither A nor B
[单项选择]When the tail-shaft is drawn from a vessel in dry-dock, which of the following inspections is required to be carried out?（）
A. The propeller hub taper and shaft keyway should be inspected for cracks or corrosion
B. The stern bearing alignment with the stern frame should be checked
C. The interior of the stern tube should be inspected for leaks
D. The shaft liner should be removed and inspected
