MDLB 1221 MODULE I QUESTIONS AND ANSWERS A+
GRADED. Buy Quality Materials!
electrical safety
power must come from a grounded, 3-wire distribution system (use isolation
transformers, ground-fault circuit interrupters (GFCI), and line isolation monitors); dont
use extension cords; inspect cords and connection; equipment logs; avoid water; report
hazards
electrical hazards
a potential ignition source; burn human tissue; cause muscle contraction and ventricular
fibrillation; can be fatal
electrical injury risk/severity depend on:
duration of contact, voltage, current, pathway of current through the body, moisture
content of the skin, susceptibility of the individual
electrical hazard controls
maintenance for any work involving faulty wiring, electrical outlets; remove and
disconnect from power sources, and tag defective; avoid extension cords; avoid placing
cords across areas of pedestrian traffic; inspect cords and equipment regularly
compoonents of fire
oxygen, heat, fuel, chemical reaction that produces fire
class A (fire)
involving ordinary combustible material such as paper, wood, and many plastics
class B (fire)
involving flammable liquids such as oil and gasoline
class C (fire)
involving electrical equipment that is plugged into an electrical source
class D (fire)
involving combustible, reactive, or flammable material
class K (fire)
involving high temperature cooking oils or fat
fire extinguishers
work by removing one or more of the key components; class ABC (dry chemical)
extinguisher is the most versatile and commonly used
class A - ordinary combustibles (fire extinguisher)
A-water, AB-foam, ABC-dry chemical
class B - flammable liquids (fire extinguisher)
AB-foam, ABC-dry chemical, BC-dry chemical
class C - electrical equipment (fire extinguisher)
BC-carbon dioxide, ABC-dry chemical, BC-dry chemical
class D - combustable metals (fire extinguisher)
D-dry, powder
class K - cooking oils and fats (fire extinguisher)
K-potassium based alkaline liquid
PASS
GRADED. Buy Quality Materials!
electrical safety
power must come from a grounded, 3-wire distribution system (use isolation
transformers, ground-fault circuit interrupters (GFCI), and line isolation monitors); dont
use extension cords; inspect cords and connection; equipment logs; avoid water; report
hazards
electrical hazards
a potential ignition source; burn human tissue; cause muscle contraction and ventricular
fibrillation; can be fatal
electrical injury risk/severity depend on:
duration of contact, voltage, current, pathway of current through the body, moisture
content of the skin, susceptibility of the individual
electrical hazard controls
maintenance for any work involving faulty wiring, electrical outlets; remove and
disconnect from power sources, and tag defective; avoid extension cords; avoid placing
cords across areas of pedestrian traffic; inspect cords and equipment regularly
compoonents of fire
oxygen, heat, fuel, chemical reaction that produces fire
class A (fire)
involving ordinary combustible material such as paper, wood, and many plastics
class B (fire)
involving flammable liquids such as oil and gasoline
class C (fire)
involving electrical equipment that is plugged into an electrical source
class D (fire)
involving combustible, reactive, or flammable material
class K (fire)
involving high temperature cooking oils or fat
fire extinguishers
work by removing one or more of the key components; class ABC (dry chemical)
extinguisher is the most versatile and commonly used
class A - ordinary combustibles (fire extinguisher)
A-water, AB-foam, ABC-dry chemical
class B - flammable liquids (fire extinguisher)
AB-foam, ABC-dry chemical, BC-dry chemical
class C - electrical equipment (fire extinguisher)
BC-carbon dioxide, ABC-dry chemical, BC-dry chemical
class D - combustable metals (fire extinguisher)
D-dry, powder
class K - cooking oils and fats (fire extinguisher)
K-potassium based alkaline liquid
PASS
