【正文】 C. Waste Heat Recovery D. Waste Handle Reference 1159 When the boiler load returns to normal, the drum pressure will rise and steam bubble formation will reduce, causing a fall in water level. This is known as _____當(dāng)鍋爐負(fù)荷回到正常時(shí)，鍋筒壓力上升，氣泡減少，水位下降。 A. ① B. ① and ② C. ② D. neither ① and ② 1157 As for a oilfired boiler too much air would indicated by _____ 對(duì)于燒油鍋爐，空氣過多，火焰呈亮白色。 A. latent heat of condensation B. latent heat of vaporization C. latent heat of saturation D. sensible heat of condensation 1151 C 1152 B 1153 D 1154 A 1155 A 1156As for an oilfired boiler if at a normal steaming condition and water goes out of sight in gauge glasses the action you should take is: ① secure oil to fires。 1154 Latent heat changes the _____ of 。 A. Descriptions B. Discrepancies C. Different D. Deflections 1146 A 1147 C 1148 B 1149 B 1150 B 1151 Impurities from the boiler water surface can be removed through the _____ 鍋爐水面的雜質(zhì)可通過上排污閥清除。 A. one to supply steam to the main propulsion turbine B. an auxiliary boiler C. A and B D. neither A nor B 1149 The safety valves should be tested and adjusted when the boiler survey is _____ 當(dāng)進(jìn)行鍋爐檢驗(yàn)時(shí)，應(yīng)對(duì)鍋爐安全閥作試驗(yàn)和調(diào)整。 1147 Safety valves on a boiler vent to the _____鍋爐安全閥通大氣。 A. feed pump suction line B. hot well C. shell of the feed heater D. feed lines to the boiler 1145 If in doubt as to the tree water level when a boiler is being oilfired, you should _____ 燒油鍋爐運(yùn)行時(shí)，對(duì)真實(shí)水位沒有把握時(shí)，應(yīng)盡快熄火。 A. to raise water level B. only while making steam C. to remove scum D. when fire are secured 1143 The water level in a steaming auxiliary boiler will always _____ 輔助鍋爐的水位：降隨蒸汽需求量的變化而變化。 A. filled with water B. purged C. cleared of air D. None of the above is true 1134 D 1135 B. 1136 C 1137 A 1138 B 1139 A 1140 B 1141 When steam is being raised on a boiler, the water level will normally _____ 鍋爐開始運(yùn)行時(shí)，水位將隨鍋爐溫度的提高而升高。 A. Safety valves B. Water tube C. Steam stop valves D. Blow down valves 1140 The furnace of a oil fired boiler should be _____ before the operating burner is lit. 鍋爐點(diǎn)火前，應(yīng)進(jìn)行掃氣。 A. watertube B. firetube C. exhaust gas D. none of the above 1138 In a _____ boiler the hot gases from the furnace pass through the tubes while the water is on the outside. 對(duì)于火管鍋爐，高溫氣體在管子內(nèi)流動(dòng)，而水在管子外流動(dòng)。 A. scaled B. cracked C. shape changed D. deformed 1136 The tube in a boiler should be blinded if found ____鍋爐管子發(fā)現(xiàn)泄露，應(yīng)封死。 A. in series B. in parallel C. either A or B D. None of the above is true 1133 If an operating auxiliary boiler has a water pH reading of 7, you should _____ 如果輔助鍋爐給水的 pH值是 7，則應(yīng)使用氫氧化鈉進(jìn)行處理，使 pH值在 10左右； A. bottom blow the boiler B. treat the water with cat~stic soda C. treat the water with chemical scavengers D. reduce the water alkalinity to remended readings 1130 C 1131D 1132 A 1133 B 1134 The internal part of the boiler, if found _____ , has to be chemically washed by yard. 鍋爐內(nèi)側(cè)發(fā)現(xiàn)水垢，應(yīng)化學(xué)清洗。 ③ gear. ① ② ③ A. ① only B. ① and ② C. ② ③ and ③ D. ① ② and ③ 往復(fù)泵、齒輪泵和葉片泵都具有干吸能力。 A. ① ② B. ② ③ C. ① ② ③ D. ② only 1131 Which of the following pumps are selfpriming, and can deal with liquid from a level below the pump: ① reciprocating 。 ② It has no internal valves。注意“ rise”與“ raise”之區(qū)別。 A. slack enough to allow slight leakage of fluid B. slightly clocked C. brought up tight so as not to allow any leakage D. fitted with a relief valve 1128 Air chambers are usually fitted to reciprocating pumps in order to ______ 往復(fù)泵中的空氣室用來保持流量穩(wěn)定。選項(xiàng) C應(yīng)是“ reciprocating pump”。 A. ① and ② B. ② and ③ C. ① and ③ D. ① ② and ③ 1125 The _______ pump discharges a nearly constant amount of liquid regardless of pressure. 不管壓力如何，容積式泵的排量幾乎恒定。 ② . they are selfpriming。 ③ . screw. 齒輪泵和螺桿泵都是容積式泵，排出閥關(guān)閉’將會(huì)產(chǎn)生具有破壞性的壓力，而離心泵不會(huì)。 A. providing the impeller with balancing holes B. the use of symmetrical impeller C. neither A nor B D. either A or B 1123 Which of the following pumps will build up a bursting pressure or stall their motors if the discharge valves are closed? ① gear。 A. ① only B. ① ② and ③ C. ① and ③ D. ① ② and ③ 1116 A 1117 C 1118 A 1119 B. 1120 B 1121 The amount of fluid delivered by a gear pump can be regulated by _______ 齒輪泵屬于容積式泵，排量只能通過改變轉(zhuǎn)子的速度來調(diào)節(jié)。 ② screw。 A. centrifugal B. plunger C. injector D. water 1120 Which of the following pumps are selfpriming, and can deal with liquid from a level below the pump。 A. Piston pump B. Screw pump C. Diffuser pump D. Waterring pump 1118 The volute pump is one in which the impeller ____對(duì)于旋渦泵，葉輪將液體排至漸漸變寬的流道。 A. to fill 2 tanks at the same time B. to use pump at a higher pressure C. to return liquid to suction side if discharge valve is closed D. All of the above are true. 1111 A 1112 C 1113 B 1114 B 1115 C 1116 The pump discharge pressure will be considerably higher than the pressure at the _______泵的排出壓力比泵進(jìn)口支管的壓力要高得多。 A. injector pumps B. posi