更多"If the discharge valve is closed be"的相关试题:
[单项选择]In （） pumps a closed discharge valve will cause bursting discharge pressure.
A. centrifugal
B. plunger
C. injector
D. water
[单项选择]In （） pump a closed discharge valve will not cause excessive pressure to build up.
A. gear
B. vane
C. screw
D. centrifugal
[单项选择]ENG VALVE CLOSED指哪个活门（）
A. HMV
B. PRSOV
C. HPSOV
D. spar valve
[单项选择]If the relief valve on the discharge side of a hydraulic pump lifts, the cause could be （）.
A. a low load on the unit
B. a clogged pump suction strainer
C. a blockage in the line between the pump and hydraulic motor
D. the hydraulic motor turning too fast
[单项选择]The valve on the discharge side of a cargo pump on a tank vessel will usually be a（）.
A. butterfly valve
B. spectacle valve
C. check valve
D. globe valve
[单项选择]ENG VALVE CLOSED灯熄灭，意味着（）
A. 活门开
B. 活门关
C. 活门在转换位
D. 活门故障
[单项选择]
The exhaust valve opens before bottom dead center in a four stroke engine to（）
Ⅰ.allow for blow down
Ⅱ.Reduce pumping losses
A. Ⅰ only
B. Ⅱ only
C. both Ⅰ and Ⅱ
D. neither Ⅰ nor Ⅱ
[单项选择]Increasing the valve clearance between a valve stem and rocker arm, will result in the valve （）
A. closing later
B. opening sooner
C. staying open for a shorter period of time
D. staying open for a longer period of time
[单项选择]The needle valve in a fuel valve will （） when the fuel pressure action on the needle valve tapered face exerts a force lower than that of the spring compression.
A. be jammed
B. be opened
C. be seated
D. be broken
[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]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 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]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]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
