更多"Auxiliary boilers are divided into "的相关试题:
[单项选择]Auxiliary boilers are divided into several classifications, one of which is （）.
A. water-tube supercritical circulation
B. water-tube forced circulation
C. fire-tube controlled circulation
D. fire-tube express circulation
[单项选择]Oxygen corrosion in auxiliary boilers is prevented by treating the boiler feed tank with either sodium （）
A. sulfite or hydrazine
B. sulfite or hygroscopic sulfite
C. bromide or hydrazine
D. bromide or hygroscopic sulfite
[单项选择]The procedures recommended for auxiliary boilers having high salinity include （）.
A. treating with oxygen scavengers
B. securing the boiler and giving it a blowing down
C. increasing the pH
D. reducing the phosphate level
[单项选择]Auxiliary boilers can be classified as（）
A. water-tube natural circulation boilers
B. fire-tube boilers
C. water-tube forced circulation boilers
D. all of the above
[单项选择]Who is in charge of the auxiliary boilers?（）
A. The chief engineer
B. The second engineer
C. The third engineer
D. The fourth engineer
[单项选择]An auxiliary reservoir for starting auxiliary engines should be kept at （）.
A. low pressure at all times
B. full pressure at all times
C. low pressure at intermittence
D. full pressure at intermittence
[单项选择]Boilers and cylinders are（）.
A. raw metallic products
B. finished metallic products
C. consumable products
D. Manufactured goods of large Size
[单项选择]Generating tubes in waste heat boilers are finned to （）.
A. reduce gas flow turbulence
B. prevent exhaust gas corrosion
C. increase the rate of combustion
D. increase the rate of heat transfer
[单项选择]The purpose of designing some waste heat boilers with sinuous fire tubes, is to（）
A. increase exhaust gas velocity through the boiler
B. reduce accumulations of carbon deposits on the heat transfer surfaces
C. eliminate exhaust gas pulsations and noise
D. increase the rate of heat transfer to the waterside
[单项选择]Electrically operated safety devices on auxiliary diesel engines function to stop the engine by （）.
A. increasing the volume of intake air
B. shutting off the fuel supply
C. increasing the engine back pressure
D. over-speeding the engine
[单项选择]Auxiliary machinery covers everything onboard except （）.
A. main engines
B. main boilers
C. pipes and fittings
D. A and B
[单项选择]Fusible plugs are installed in fire-tube boilers to （）.
A. provide a means of draining the boiler
B. warn the engineer of low water level
C. cool the crown sheet at high firing rates
D. open the burners electrical firing circuits
[单项选择]The exhaust boilers are used to recover some of （） carried in the exhaust gas from the main engine.
A. water
B. oil
C. heat
D. steam
[单项选择]In boilers, besides maintaining the burner atomizers, air diffuser vanes, fuel temperature, forced draft fan, fuel pump and other hardware in good condition, there are some adjustments on the （）that can produce a good flame for the most efficient operation.
A. fuel-air ratio
B. compression ratio
C. fuel rack
D. viscosity index
[单项选择]For auxiliary engines the permissible overload is （） for one hour every twelve hours.
A. 10%
B. 15%
C. 20%
D. 25%
[单项选择]Flame failure in an automatically fired auxiliary boiler can from a/an （）
A. incorrect electrode setting
B. incorrect nozzle position
C. clogged fuel nozzle
D. broken high tension lead
[单项选择]According to Regulations, a power driven auxiliary steering gear for a vessel capable of a 20 knot service speed, must be capable of producing a rudder movement at which of the minimum speeds listed below?（）
A. 7 knots
B. 10 knots
C. 15 knots
D. 20 knots
[单项选择]If an auxiliary diesel engine temperature is higher than normal ,but the thermostat is determined not to be defective you would suspect a /an （）
A. cavitation erosion in the water jackets
B. excess corrosion inhibitor in the coolant
C. dirty jacket water cooler
D. defective turbocharger
