更多"Which characteristic of Halon is a "的相关试题:
[单项选择]Which is a disadvantage of Halon as a fire extinguishing medium?（）
A. Conducts electricity
B. Difficult to store
C. Large volume necessary to be effective
D. Ineffective in powdered metal fires
[单项选择]Which characteristic is an advantage of Halon as a fire extinguishing medium?（）
A. Electrically non-conductive
B. Relatively inexpensive
C. Effective against chemicals containing an oxidizer
D. All of the above
[单项选择]Which characteristic is a disadvantage of a controllable- pitch propeller as compared to a fixed-pitch propeller? （）
A. Slightly higher fuel consumption
B. Lack of directional control when backing
C. Inefficient at high shaft RPM
D. Some unusual handling characteristics
[单项选择]‘Offset’ is an inherent characteristic of which of the follow types of control modes?（）
A. Tow position
B. Proportional
C. Reset
D. Rate
[单项选择]Which characteristic or condition will have the greatest effect on increasing a hydraulic oils viscosity?（）
A. Pour point
B. Cloud point
C. Vacuum
D. Pressure
[单项选择]Which of the following characteristic of lube oil helps to reduce the amount of deposits in the piston ring belt during the combustion process in a diesel engine?（）
A. Low viscosity index
B. Low carbon forming tendencies
C. High film strength
D. High non-corrosive qualities
[单项选择]Which of the listed statements is a characteristic of the liquid charged power element used with thermostatic expansion valves?（）
A. At the designed operating temperature, the liquid refrigerant charge has changed to a vapor
B. The liquid refrigerant tends to collect at the bellows or diaphragm and reduces the valve sensitivity
C. The sensing bulb is empty of liquid refrigerant charge at the designed operating temperature
D. The sensing bulb is never emptied of liquid refrigerant under normal operating conditions
[单项选择]Which of the following is a characteristic of a data center core?（）
A. Server-to-server traffic always remains in the core layer.
B. The recommended practice is for the core infrastructure to be in Layer 3.
C. The boundary between Layer 2 and Layer 3 should be implemented in the aggregation layer.
D. The Cisco Express Forwarding hashing algorithm is the default, based on the IP address and Layer 4 port.
E. Core layer should run BGP along with an IGP becauseiBGP has a lower administrative distance than any IGP.
[单项选择]Which of the following is a characteristic of a Ro-Ro vessel（）.
A. Passenger tours available upon docking
B. Long port stays necessary to secure vehicles
C. Short in port turnaround times
D. Heavy vehicles only require lightweight securing equipment
[单项选择]Which of the following problems should be taken when cleaning the air filter on a diesel engine equipped with a turbocharger?（）
A. Reduce engine speed to idle before removing the filter
B. Soak the dirty filter in kerosene only
C. Blow out the air inlet with compressed air
D. Cover the air inlet after removing the filter
[单项选择]Which of the listed precautions should be taken when cleaning the internals of a motor with compressed air?（）
A. Open the machine on both ends so as to allow the air and dust to escape
B. Be certain that the circuit breaker is opened and tagged on the feeder panel
C. Be certain that the air is clean and as dry as possible
D. All of the above
[单项选择]Inspection of a Halon extinguisher involves checking the hose，handle，nozzle，and（）.
A. sight glass
B. weighing the extinguisher
C. service technicians report
D. last date it was charged
[单项选择]The principal personnel hazard unique to Halon extinguishers is（）.
A. displacement of oxygen
B. skin irritation
C. inhaling toxic vapors
D. eye irritation
[单项选择]Due to the hazards involved with Halon extinguishers on a ship，the size II extinguisher may only be used（）.
A. outside
B. on class C fires
C. in an emergency
D. on class B fires
[单项选择]Halon fire extinguishers are NOT effective when used on which types of fires?（）
A. Fires in electrical equipment
B. Flammable oils and greases
C. Class A fires in ordinary combustibles
D. Materials containing their own oxygen
[单项选择]Halon extinguishes fire primarily by（）.
A. cooling
B. smothering
C. shielding of radiant heat
D. breaking the chain reaction
[单项选择]Halon extinguishes a fire by（）.
A. breaking the chain reaction
B. smothering the fire
C. cooling the fire
D. coating the fule with a nonflammable surface
