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单选题 The ratio of the weight of moisture contained in a given volume of air, to the weight of moisture that the same sample would hold if saturated, is called the
学科：轮机英语
时间：2023-11-07 17:17:13
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题目1单选题
In a _____ boiler the hot gases from the furnace pass through the tubes while the water is on the outsideA. water-tubeB. fire-tubeC. exhaust gasD. None of the above is true
题目2单选题
Large pipes or _____ are fitted between the steam and water drums to ensure good natural circulation of waterA. fire-tubesB. furnacesC. down-comersD. soot-blowers
题目3单选题
Between the steam dram and the smaller water dram below, large numbers of smaller diameter _____ tubes are fittedA. fireB. water wallC. generatingD. down comer
题目4单选题
_____ are mounted in pairs to protect the boiler against overpressureA. Safety valvesB. Water tubesC. Steam stop valvesD. Blow down valves
题目5单选题
W.H.R stands for _____A. Water Head RegisterB. Water Heater Re-circulatingC. Waste Heat RecoveryD. Waste Handle Reference
题目6单选题
In general, _____ is suitable for delivering small quantities at high pressureA. reciprocating pumpB. gear pumpC. centrifugal pumpD. vane pump
题目7单选题
A vane pump belongs to _____ according to its working principleA. reciprocating pumpB. positive displacement pumpC. centrifugal pumpD. centripetal pump
题目8单选题
Through a _____ pump, the liquid is transferred from the suction to the discharge by the mechanical variation of the volume of a chamber or chambersA. positive displacementB. ejectorC. centrifugalD. air compressor
题目9单选题
The gear, screw, and vane pumps are all classified as _____A. variable stroke pumpsB. multistage pumpsC. positive displacement pumpsD. triple-ported pumps
题目10单选题
A centrifugal pump produces the required pressure energy by means of a rotating _____ provided with vanesA. propellerB. impellerC. circumferenceD. screw
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