题海让大学四年没有难题
白天模式登陆

题目详情

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 brittle

B. prevent moisture from condensing in the windings during shutdown

C. prevent acidic pitting of the slip rings

D. keep the lube oil warm for quick starting

轮机英语课程封面

学科：轮机英语

时间：2023-10-18 16:00:27

相关题目

相关作业

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 circuit
A. 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 equipment
A. 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 energy
A. 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
Copyright © 2022 津ICP备2021001502号