更多"Dry chemical extinguishers extingui"的相关试题:
[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]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]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]When fighting a fire with a portable dry chemical fire extinguisher，the stream should be directed（）.
A. over the top of the flames
B. off a bulkhead into the fire
C. in front of the fire
D. at the base of the fire
[单项选择]On a class B fire，which portable fire extinguisher would be the LEAST desirable?（）
A. Carbon dioxide
B. Water (stored pressure)
C. Dry chemical
D. Foam
[单项选择]Halon extinguishers used on a class C fire should be directed at the（）.
A. base of the equipment
B. top of the equipment
C. power source
D. source of the fire
[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]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]The best method of extinguishing a class A fire is to（）.
A. remove oxygen from the area
B. cool fuel below ignition temperature
C. smother with CO2
D. smother fire with foam
[单项选择]A class C fire would be burning（）.
A. fuel oil
B. wood
C. celluloid
D. electrical insulation
[单项选择]The class of fire on which a blanketing effect is essential to extinguish the fire is （）.
A. class A
B. class B
C. class C
D. class D
[单项选择]As compared to carbon dioxide，dry chemical has which advantage?（）.
A. Cleaner
B. Effective on metal fires
C. Greater range
D. More cooling effect
[单项选择]An advantage of a dry chemical over a carbon dioxide fire extinguisher is its（）.
A. greater range
B. effectiveness 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
