轮机英语船舶电气与船舶安全单项选择题每日一练(2019.01.18)

单项选择题
To prevent the unnecessary loading of an air conditioning system while maintaining the designed dry bulb temperature and relative humidity in an air conditioning system, you should （）
A.admit only enough fresh outside air to provide proper ventilation
B.reduce the air reheating system load
C.lower the compressor head pressure
D.operate the purge recovery unit continuously
单项选择题
Fire detecting systems on merchant vessels may be arranged to sense （）.
A.smoke
B.rate of temperature rise
C.ionized particles
D.all of the above
单项选择题
If the speed of a turbocharged diesel engine is maintained constant the turbocharger speed will （）
A.decrease until the engine speed increases
B.increase as the load increases
C.decrease as the load
D.increases remain unchanged
单项选择题
A circuit breaker differs from a fuse in that a circuit breaker （）.
A.melts and must be replaced
B.is enclosed in a tube of insulating material with metal ferrules at each end
C.gives no visual indication of having opened the circuit
D.trips to break the circuit and may be reset
单项选择题
The safety management objectives of the ISM Code are （）.
A.to provide for safe practices in ship operation and a safe working environment
B.to establish safeguards against all identified risks
C.to continuously improve safety management skills of personnel, including preparing for emergencies
D.all the above