更多"What is head tank in the closed coo"的相关试题:
[单项选择]In a closed cooling water system, which of the problems can cause the water pressure to fluctuate?（）
A. An open vent in the cooling system
B. A fouled sea chest
C. A restricted water passage in the engine
D. Air entrained in the cooling water
[单项选择]In the closed cooling system, the water （）.
A. is made to circulate out of the system
B. is made to circulate within the system
C. is made circulate within the system
D. is made circulate out of the system
[单项选择]Head tank should be used to remove （） from cooling water.
A. scale
B. sludge
C. chemicals
D. air
[单项选择]Vents are led from the engine to the head tank for the release of （） from the cooling water.
A. air
B. heat
C. sludge
D. steam
[单项选择]Vents are led from the engine to head tank （） from the cooling water.
A. for the release of air
B. for the release of water
C. in order to the release of air
D. because the release of air
[单项选择]In any diesel engine closed freshwater cooling system, the lowest pressure exists at the （）.
A. jacket water outlet
B. cooling water pump outlet
C. heat exchanger outlet
D. expansion tank atmospheric vent
[单项选择]Approximately what percent of tank space should be left for expansion of oil due to possible temperature increase?（）
A. 1% to 3%
B. 1% to 2%
C. 4%
D. 2% to 4%
[单项选择]If the coolant temperature of a closed cooling water system for a diesel engine gradually increases, the trouble usually is （）
A. a broken shaft on the freshwater pump
B. an excessive accumulation of scale exchanger
C. an incorrect thermostatic element operating range
D. lube oil in the cooling water
[单项选择]In a closed diesel engine freshwater cooling system, the amount of coolant flowing through the heat exchanger is controlled by the （）.
A. suction pressure regulator
B. thermostatic bypass valve
C. sea water temperature
D. water level in the expansion tank
[单项选择]In a closed cooling system for a turbocharged, four-stroke/cycle diesel engine, fluctuating water pressure can be caused by （）
A. improper venting of the cooling system
B. carrying the expansion tank water level too high
C. a totally clogged impeller in the cooling water pump
D. an incorrectly set cooling system temperature control
[单项选择]In general, domestic flesh water tank kept under pressure by an external supply of （）.
A. forced circulating pump
B. compressed air
C. gravity tank
D. bead tank
[单项选择]When bilge water is heated in a holding tank, which one of the following statements is not accurate?（）
A. The high temperature facilitates primary gravity separation
B. Most of the oil and organic solvents are raised to the top layer
C. The high the temperature is, the more the top oil will be collected
D. The high temperature has little use on the separation of emulsified oil
[单项选择]A safe water daymark has what shape? （）
A. Triangular
B. Diamond
C. Circular
D. Octagonal
[单项选择]What is used to test a tank for oxygen content?（）
A. Combustible gas indicator
B. Vapor indicator
C. Atmosphere analyzer kit
D. None of the above
[单项选择]The pressure head of a water pump is given in the unit of （）.
A. kg
B. MPa
C. mH20
D. None of the above
[单项选择]What does the term head mean when applied to a fire pump?（）
A. Length of the discharge pipe
B. Height of the discharge pipe
C. Difference between the discharge and suction pressures
D. Sum of discharge and suction pressures
[单项选择]What does salt water draft mean?（）.
A. It means summer draft
B. It means maximum draft
C. It means fresh water draft
D. It means seawater draft
[单项选择]What DOCS SALT WATER DRAFT means?（）.
A. It means summer draft
B. It means Maximum draft
C. It means Fresh Water draft
D. It means Seawater Draft
[单项选择]What’s the advantage of oily water separator that meets the requirement of MEPC 60(33) over MEPC 107(49)?（）
A. more economic
B. larger capacity on oil treatment
C. less costive
D. more capable of separating emulsified oil
