更多"Which of the listed extinguishing a"的相关试题:
[单项选择]Which of the fire extinguishing agents listed is the safest to use when combating a class C fire?（）
A. CO2
B. Foam
C. Water fog
D. Soda acid
[单项选择]0f all the extinguishing agents listed below, which one has the greatest capacity for heat adsorption?（）.
A. Water fog
B. Carbon dioxide
C. Dry chemical
D. Solid stream of water
[单项选择]Fire extinguishing agents used on Class C fires must be（）.
A. able to absorb heat
B. water based
C. nonconducting
D. nontoxic
[单项选择]An extinguishing agent which effectively cools，dilutes combustible vapors，removes oxygen，and provides a heat and smoke screen is（）.
A. carbon dioxide
B. Halon 1301
C. dry chemical
D. water fog
[单项选择]Which extinguishing agent is effective in combating an isoprene fire?（）
A. Dry chemicals
B. CO2
C. Foam
D. All the above
[单项选择]Which extinguishing agent will cool down a heated bulkhead in the least amount of time?（）
A. Water stream
B. Water fog or apray
C. Steam
D. Dry chemical
[单项选择]Which extinguishing agent is recommended in the Chemical Data Guide for use on a carbon disulfide fire?（）
A. Alcohol foam
B. Dry chemical
C. Chemical foam
D. Water fog
[单项选择]Which extinguishing agent is NOT recommended in the Chemical Data Guide for use on a cyclohexane fire?（）
A. Foam
B. Carbon dioxide
C. Dry chemical
D. Water fog
[单项选择]Which fire extinguishing agent has the greatest capacity for absorbing heat?（）
A. Water
B. Foam
C. Dry chemical
D. Carbon Dioxide
[单项选择]Which extinguishing agent is most effective on a mattress fire?（）
A. CO2
B. Foam
C. Dry Chemical
D. Water
[单项选择]Which fire extinguishing agent can NOT be used on an ethylenediamine?（）
A. Water foam
B. Dry chemical powder
C. Water fog
D. Alcohol foam
[单项选择]Which extinguishing agent is the best for use on electrical fires?（）
A. Foam
B. CO2
C. Dry chemical
D. Water fog
[单项选择]Which extinguishing agent is best for use on a magnesium fire?（）
A. Water
B. Sand
C. CO2
D. Dry chemical
[单项选择]Which of the listed refrigeration system components keeps the refrigerant circulating through the system?（）
A. Expansion valve
B. Condenser
C. Evaporator
D. Compressor
[单项选择]Which of the listed governor characteristics will greatly affect the load sharing relationship between paralleled diesel generators?（）
A. Sensitivity
B. Power
C. Speed droop
D. Compensation
[单项选择]Which of the routine maintenance procedure listed is required for starting air receivers?（）
A. Frequent draining of accumulated moisture
B. Frequent testing of relief valves
C. A close watch on temperature to prevent fluctuations in pressure
D. Frequent cleaning to re move oil and foreign matter
[单项选择]Which of the routine maintenance procedures listed is required for starting air receivers?（）
A. over-speeding
B. overload
C. low exhaust temperature
D. high crankcase pressure
[单项选择]Which of the listed statements is correct concerning the starting of centrifugal pumps?（）
A. They should always be started with the discharge valve closed
B. They should always be started with the discharge valve opened
C. A priming pump is always required to flood the impeller suction
D. They should always be started with the sealing line valves closed
