Time delayed or delayed action-type fuses are designed to ______.

试卷相关题目

• 1A ground in an electrical circuit outside the engine room ______.

  A.cannot be detected under normal conditions

  B.is of no consequence to engineering personnel

  C.is indicated at the branch circuit breaker panel

  D.is indicated by the ground detecting lamps on the main switchboard

  开始考试点击查看答案
• 2______is a machine by which electrical energy is transformed into mechanical energy.

  A.An alternator

  B.An electric motor

  C.A diesel engine

  D.A main switchboard

  开始考试点击查看答案
• 3The operation of _____ two alternators requires the voltages to be equal and also in phase.

  A.control

  B.series-mounting

  C.running

  D.paralleling

  开始考试点击查看答案
• 4The main generators are connected to ______.

  A.distribution boards

  B.section boards

  C.emergency switch boards

  D.main switch boards

  开始考试点击查看答案
• 5Electric insulation is made of organic substances and so gradually ______with age.

  A.deteriorates

  B.increases

  C.are fouled

  D.becomes better

  开始考试点击查看答案
• 6When voltage and current developed in an AC circuit reach their peak values at the same time, the power factor is ______.

  A.lagging

  B.leading

  C.maximum

  D.minimum

  开始考试点击查看答案
• 7When there is a fire in a large electric motor, normally the very FIRST step is to ______.

  A.secure the electric supply

  B.ventilate area to remove smoke

  C.start the fire pump and lead out hose

  D.apply foam

  开始考试点击查看答案
• 8Before “stand by” is rung on the engine telegraph, it is usual to give the main diesel engine a brief trial ______ahead and astern.

  A.with power

  B.on power

  C.with air

  D.on air

  开始考试点击查看答案
• 9Bridge orders must be ______and a record of any required changes in speed and direction should be kept.

  A.slowly carried away

  B.carried out with a period of delay

  C.promptly carried out

  D.paid by the captain

  开始考试点击查看答案
• 10After the order ' ______' is given, the air system is shut down, the turning gear put in.

  A.Finished With Engine

  B.Stop The Engine

  C.Stand-by Engine

  D.Slow-down Engine

  开始考试点击查看答案