更多"A gradual decrease in the discharge"的相关试题:
[单项选择]The boiler feed pump discharge pressure is higher than the steam drum pressure to （）.
A. ensure feed water flow into the boiler
B. keep the steam drum pressure high
C. prevent water hammer in the feed line
D. help the feed water flash to steam
[单项选择]The pump discharge pressure will be considerably higher than the pressure at the （）.
A. pump entry branch
B. outlet pipe
C. impeller
D. None of the above is true
[单项选择]To maintain design discharge pressure from a centrifugal pump, the design clearance must be maintained between the （）.
A. shaft and impeller
B. motor and pump shaft
C. casing and impeller wearing rings
D. lantern ring and impeller
[单项选择]A decrease in barometric pressure is associated with all of the following except（）.
A. rising warm air
B. proximity to a low pressure area
C. inward spiraling circulation
D. clear dry weather
[单项选择]The fuel oil pressure and forced draught pressure should be matched to ensure good combustion with a full steady flameIn the sentence the word “match” means （）
A. join with
B. mix
C. be equal to
D. be constant
[单项选择]High pressure and low pressure alarms must be tested（）.
A. no earlier than 24 hours prior to loading
B. no later than 24 hours prior to loading
C. anytime prior to loading
D. weekly
[单项选择]The vapor pressure of a gas is the pressure necessary to keep it in a(n)（）.
A. soluble state
B. solid state
C. liquefied state
D. inert state
[单项选择]Badly leaking refrigeration compressor discharge valves will cause（）.
A. overfeeding of the expansion valve
B. damage to the condenser
C. constant running of the compressor
D. flooding of the receiver
[单项选择]A slow，gradual fall of the barometer indicates approaching（）.
A. gale force winds within 12 hours
B. blizzard conditions
C. deteriorating or unsettled weather
D. heavy，wind driven rain
[单项选择]The discharge from a carbon dioxide fire extinguisher should be directed（）.
A. at the base of the flames
B. at the center of the flames
C. to the lee side of the flames
D. over the tops of the flames
[单项选择]You intend to discharge medical or hazardous wastes ashore MARPOL annex V requires you to notify a receiving port or terminal in advance.How much advance notice require?（）
A. 12 hours
B. 24 hours
C. 48 hours
D. Advance notification is not required
[单项选择]If the discharge valves on a refrigeration compressor are leaking badly, the compressor should （）.
A. run continuously
B. not start
C. have high discharge pressure
D. short cycle on the high pressure switch
[单项选择]The major difference between the discharge and suction valves installed in most low pressure, reciprocating air compressors is that（）
A. one valve seats upwards, while the other seats downwards
B. the reed valves used on the discharge are made substantially thicker and heavier than the suction valves
C. the suction valve springs exert a greater tension than the discharge valve springs
D. the discharge valve springs exert a greater tension than the suction valve springs
[单项选择]A seaman lost his continuous discharge book during the voyage. Upon discharge from Articles，he should be issued a（）.
A. letter of service on company letterhead signed and sealed by the master
B. Record of Entry in a Continuous Discharge Book for use in applying for a duplicate book
C. Certificate of Discharge with the white copy forwarded to the Commandant
D. Mutual Release (CG-2119)，and the articles should be annotated as to the loss
[单项选择]If the compressor-discharge temperature is higher than the receiver temperature（）
A. increase the amount of cooling water to the condenser
B. decrease the amount of cooling water to the condenser
C. add more refrigerant to the system
D. remove some of the refrigerant from the system
[单项选择]The discharge rate or capacity of a centrifugal pump will vary directly as the （）.
A. change in the impeller diameter
B. square of the impeller radius
C. cube of the impeller diameter
D. impeller efficiency for large changes in its size
[单项选择]When starting a centrifugal pump, the discharge valve should be （）.
A. closed
B. opened fully
C. cracked open
D. partly open
[单项选择]Which is an exception to the garbage discharge requirements in Annex V to MARPOL 73/78?（）
A. The garbage to be discharged will sink
B. Garbage accumulation on board has exceeded storage space
C. A person falls overboard，and a plastic ice chest is thrown for flotation
D. The destination port or terminal cannot receive garbage
[单项选择]The oil discharge monitoring system in the oil tanker vessels is used for detecting the amount of oil discharged overboard to ensure that it does not exceed（）
A. 15 liters nautical mile
B. 30 liters nautical mile
C. 60 liters nautical mile
D. 100 liters nautical mile
