更多"When fighting a fire with a portabl"的相关试题:
[单项选择]When must a dry chemical fire extinguisher be recharged?()
A. After each use
B. When the air temperature exceeds 90°F
C. Every 6 months
D. Every 12 months
[单项选择]A portable dry chemical fire extinguisher discharges by().
A. gravity when the extinguisher is turned upside down
B. pressure from a small CO2 cartridge on the extinguisher
C. air pressure from the hand pump attached to the extinguisher
D. pressure from the reaction when water is mixed with the chemical
[单项选择]Dry chemical fire extinguishers are effective on which type(s) of fire?()
A. Burning oil
B. Electrical
C. Paint
D. All of the above
[单项选择]An ABC dry chemical fire extinguisher would be LEAST effective against a fire in().
A. a mattress
B. spilled liquids such as oil or paint
C. high voltage electrical gear
D. a trash can
[单项选择]An ABC dry chemical fire extinguisher would be least effective against a fire in().
A. a mattress
B. spilled liquids such as oil or paint
C. high voltage electrical gear
D. a trash can
[单项选择]An “ABC” dry chemical fire extinguisher would be LEAST effective against a fire in().
A. a mattress
B. spilled liquids such as oil or paint
C. high voltage electrical gear
D. a trash can
[单项选择]Dry chemical extinguishers extinguish class B fires to the greatest extent by().
A. cooling
B. smothering
C. oxygen dilution
D. breaking the chain reaction
[单项选择]When dry chemical extinguishers are used to put out class B fires,there is a danger of reflash because dry chemical().
A. is not an effective agent on Class B fires
B. does little or no cooling
C. dissipates quickly
D. is rapidly absorbed by the liquid
[单项选择]When fire pumps are used for other than firefighting service,each pipe connecting the other service (except for branch lines used for deck washing) must have a().
A. check valve installed in the line
B. shut off valve at a manifold near the pump
C. quick disconnect union within ten feet of the pump
D. regulator in the line set at 125 psi
[单项选择]When two fire hose teams are attacking a fire they should().
A. use different fire hose pressures
B. use fire hoses of different sizes
C. not attack the fire from opposite sides
D. not wear protective clothing
[单项选择]When referring to dry bulk cargoes,the term “flow state”().
A. designates the state of a commodity when the ship is heeled past the angle of repose
B. relates to the suitability of loading a cargo by flowing down inclined chutes
C. refers to the saturation of a dry bulk product with water to the point where it acts as a liquid
D. relates to the minimum granule size of a particular product where it will flow like a liquid at an angle of 30°
[单项选择]One disadvantage of using regular dry chemical (sodium bicarbonate) in firefighting is that().
A. it can break down under high heat and emit noxious fumes
B. it will decompose under prolonged storage and lose its effectiveness
C. fire has been known to flash back over the surface of an oil fire
D. it is ineffective in fighting fires in high-voltage electrical equipment
[单项选择]An advantage of a dry chemical over a carbon dioxide fire extinguish is its().
A. greater range
B. effective on all types of fires
C. cleanliness
D. All of the above
[单项选择]An advantage of an ABC dry chemical over a carbon dioxide extinguisher is().
A. lack of toxicity
B. the multipurpose extinguishing ability
C. bum-back protection
D. cooling ability
[单项选择]As compared to carbon dioxide,dry chemical has which advantage?().
A. Cleaner
B. Effective
C. Greater range
D. More cooling effect