#3001  Burns that cause the skin to form blisters only are referred to as:   	2	first-degree burn.   	second-degree burn.   	third-degree burn.   	none of these.   	   	
#3002  Which light wavelengths are most harmful?    	2	visible and infrared   	ultraviolet   	infrared   	visible and ultraviolet   	   	
#3003  Clothing worn in the welding shop should be:    	1	100% wool or 100% cotton.   	100% polyester or 100% nylon.   	25% cotton and 75% rayon.   	35% polyester and 65% rayon.   	   	
#3004  The haze in welding shops is caused by:    	3	dust.   	cigarette and pipe smoke.   	decomposed and vaporized fluxes and metals.   	high-speed fans.   	   	
#3005  How far must oxygen cylinders be stored from flammable materials?    	4	5 ft (1.5 m)   	10 ft (3m)   	16 ft (4.9 m)   	20ft(6.1m)   	   	
#3006  A room that is used to store acetylene cylinders must:    	4	be well lit.   	have a solid steel door.   	be large enough for two workers.   	be located away from halls.   	   	
#3007  What can be used to free an acetylene cylinder that has been frozen to the ground?   	1	warm water   	hot air   	propane torch   	Nothing can be used safely to free acetylene cylinder.   	   	
#3008  How long must an acetylene cylinder that has been lying on its side be set vertically before it is used?   	1	15 minutes   	60 minutes   	10 minutes   	30 minutes   	   	
#3009  When is it necessary in a weld shop to have a fire watch?    	4	when a person is welding outdoors   	if a person cannot see the nearest fire extinguisher   	when sparks are traveling more than 15 ft (4.6m)   	when welding within 35 ft (10.7m) of combustible materials   	   	
#3010  What type of fire extinguisher is used on electrical fires?    	3	type A   	type B   	type C   	type D   	   	
#3011  When using a fire extinguisher on a fire, it should be:    	1	pointed at the base of the fire.   	moved up and down to cool the flame.   	pointed at the top of the fire.   	held very close to the flames.   	   	
#3012  One advantage of a two-stage regulator over a single-stage regulator is that the two-stage regulator can be used:   	4	for a larger number of different types of gases.   	with lower pressures and slower flow rates.   	with less chance of exploding.   	on higher flow rates.   	   	
#3013  The first stage of a two-stage regulator reduces the cylinder pressure to approximately:   	3	125 psig (8.7 kg/cm2g).   	175 psig (12.3 kg/cm2g).   	225 psig (17.5 kg/cm2g).   	300 psig (21.0 kg/cm2g).   	   	
#3014  What causes the difference in the pressure shown on the working pressure gauge and the actual pressure at the torch tip?   	4	line drop   	resistance of the gas as it flows through the hose   	There is no difference in pressure.   	both a and b   	   	
#3015  How far from the actual work should regulators be located?    	2	25 ft (7.6 m)   	so that flames or sparks cannot reach the regulators   	10 ft (3m)   	so that the regulators can be easily reached   	   	
#3016  A notched nut indicates:    	1	left-hand threads.   	that the nut is extra strong.   	right-hand threads.   	that the nut is made of brass.   	   	
#3017  Combination welding and cutting torches are most often used    	2	to cut thick material.   	by schools and small welding shops.   	by steel mills.   	both a and c   	   	
#3018  An injector torch can use fuel gases with pressures as low as:    	4	4 oz/in2 (17.5 g/cm2).   	2 lb/in2 (140.6 g/cm2).   	1 lb/in2 (70.3 g/cm2).   	6 oz/in2 (26.3 g/cm2).   	   	
#3019  Injector torches can use fuel gases with pressures as low as:    	3	7 psi (0.49 kg/cm2).   	2 psig (0.14 kg/cm2g).   	6 oz/in2 (26.3 g/cm2).   	9 oz/in2 (39.4 g/cm2).   	   	
#3020  All welding tips are numbered according to:    	3	the AWA standard numbering system.   	the National Association of Equipment Manufacturers numbering system.  	the manufacturer's own numbering system.   	both a and b   	   	
#3021  Repeated use of a tip cleaner:    	4	keeps the tip clean and in good shape.   	makes welding easy.   	makes the torch easy to light.   	enlarges the orifice in the tip.   	   	
#3022  Which one of the following will affect the temperature of an oxyacetylene flame?   	4	flame condition (neutral, oxidizing, or carburizing)   	purity of the gases   	homogeneity of the gas mixture   	all of these   	   	
#3023  The highest temperature produced in an oxyacetylene flame is found:   	3	in the inner cone.   	near the end of the secondary flame.   	around the inner cone.   	along the centerline of the flame.   	   	
#3024  The maximum safe pressure of acetylene is:    	1	15 psig (1.05 kg/cm2g).   	26 psig (172 kPa).   	30 psig (2.1 kg/cm2g).   	10 psig (69 kPa).   	   	
#3025  Which one of the following is used inside an acetylene cylinder to absorb the gas?   	4	calcium carbide   	alkaline   	acetate   	acetone