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单选题 2电气控制设备Copper is often used as an electrical conductor because it ( )
学科：轮机英语
时间：2023-10-18 16:00:28
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题目1单选题
船舶电气设备概况Time delayed or delayed action-type fuses are designed to( )A. prevent grounds in branch circuitsB. prevent opens in motor circuitsC. permit momentary(瞬间的) overloads without meltingD. guard lighting and electronic circuits
题目2单选题
1船舶电气设备概况In a series circuit, which value will remain unchanged at all places in the circuitA. VoltageB. CurrentC. ResistanceD. Inductance
题目3单选题
船舶电气设备概况The main purpose of an electric space heater installed in a large AC generator is to ( )A. prevent the windings from becoming brittleB. prevent moisture from condensing in the windings during shutdownC. prevent acidic pitting of the slip ringsD. keep the lube oil warm for quick starting
题目4单选题
1船舶电气设备概况Electric wires should have each feature of the following except ( )A. flame retardant(阻燃性)B. moisture resistantC. oil resistantD. low conductivity
题目5单选题
船舶电气设备概况A. voltmeter is positioned across the bus-bars to indicate their( ).A.currentB. voltageC. powerD. Resistance
题目6单选题
1船舶电气设备概况( )belongs to emergency power supplying equipmentA. Emergency fire pumpB. WindlassC. Main-sea water pumpD. Fresh water pump
题目7单选题
船舶电气设备概况( ) is a machine by which electrical energy is transformed into mechanical energyA. An alternatorB. An electric motorC. A diesel engineD. A main switchboard
题目8单选题
电气控制设备Since fuse elements are made of zinc or any alloy of tin and lead(铅锡合金), the melting point of the fuse element must be ( )A. higher than that of copperB. lower than that of copperC. equal to that of copperD. reached when the conductor it is protecting becomes 'white hot'
题目9单选题
2电气控制设备Copper is often used as an electrical conductor because it ( )A. has high resistance at low temperaturesB. has a highly polished surfaceC. is able to pass current with little resistanceD. holds insulation together well
题目10单选题
电气控制设备Ammeter is to measure the ( )A. currentB. voltageC. powerD. frequency
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