更多"An indicator on the main switchboar"的相关试题:
[单项选择]The purpose of a main switchboard circuit breakers reverse-power trip is to （）.
A. prevent main circuit overload
B. protect the circuit breaker blowout coil
C. prevent alternator motorization
D. prevent low voltage tripout
[单项选择]（）are supplied by main switchboard directly.
A. Suez Canal searchlight, air compressor and air conditioning compressor
B. Air compressor, boiler blower and refrigeration plant
C. Boiler blower, Suez Canal searchlight and refrigeration plant
D. Suez canal searchlight, air compressor and boiler blower
[单项选择]（）is power supplied by main switchboard directly not through sub-board.
A. Deck machinery
B. Little power load
C. Some important load
D. stationary submersible pump
[单项选择]（）is not installed on the main switchboard.
A. Ammeter and changeover switch
B. Power factor meter
C. Synchroscope
D. Reverse sequence relay
[单项选择]To （） , the power is supplied by main switchboard directly not though sub-board.
A. save network cost
B. improve the reliability of supplying power to important load
C. prevent sequence reverse
D. increase the power factor of important load
[单项选择]（）is not a part of the main switchboard.
A. Busbar
B. Load panel of main generator
C. Paralleling panel
D. Shore connection box
[单项选择]（） is (are) not power supplied by main switchboard directly.
A. Steering gear and windlass
B. Navigation light and radio power panel
C. Navigation device power box
D. Daily fresh water pump
[单项选择]An indicator card or pressure-volume diagram, shows graphically the （）
A. compression ratio of the engine
B. volume of the engine
C. relationships between pressure and volume during one stroke of the engine
D. relationships between pressure and volume during one cycle of the engine
[单项选择]The oil index of main engine should be controlled to prevent it from in heavy weather（）
A. over heat
B. over speed
C. over pressure
D. over worn
[单项选择]Main propulsion engine lube oil sumps should be constructed （）
A. so as to never be integral lube
B. with a sloped bottom
C. only of nonferrous, noncorrosive metals
D. with drain/return lines terminating just above or at the designed normal level
[单项选择]（）day，pilot flag should be displayed from main mast．
A. From
B. By
C. on
D. With
[单项选择]A switchboard for an AC electrical system requires the use of which of the following devices（）.
A. Frequency meter
B. Ohmmeter
C. Induction voltage regulator
D. Current transformer governor
[单项选择]An alternator switchboard has a synchroscope and synchronizing lamps, if the synchroscope is broken, which of the steps listed is the most essential before an alternator can be paralleled with the bus （）
A. The breaker should be closed when one synchronizing lamp is dark and the other is bright
B. The breaker should be closed when both synchronizing lamps are bright
C. The frequency meter should be used to determine that the incoming alternator frequency is slightly higher than the bus
D. A portable phase sequence indicator must be used to verify the information from the lamps
[单项选择]A switchboard, for a AC electrical distribution system, will be provided with which of the following components （）.
A. Frequency meter
B. Ammeter
C. Voltmeter
D. All of the above
[单项选择]（）is not installed on the emergency switchboard.
A. Control panel
B. Paralleling panel
C. Load panel
D. Busbar
[单项选择]The （） of the main shaft should be measured with a （）.
A. clearance；calipers
B. sinking；bridge gauge
C. diameter；bridge gauge
D. clearance；lead wire
