3-2-2

Research found that a male worker should be protected against body current to a perception level of ? . a.0.11 mA b.1.1 mA c.11 mA d.111 mA

B. 1.1 mA

A current of as little as ? lasting three seconds will result in possible ventricular fibrillation in both men and women. a.50 mA b.100 mA c.0.5 A d.1.0 A

B. 100 mA

At the ? current threshold, muscles contract and a hand grip on an energized object cannot be released. a.freeze b.let-go c.perception d.seize

B. Let-go

A current of 1.1 milliamperes will cause a slight tingling in the hand of an average male worker. This current threshold level is called ? . a.let-go b.perception c.sensation d.shock

B. Perception

The amount of body current depends upon both the voltage across the body and the ? . a.body temperature b.resistance of the body c.threshold current d.time in contact

B. Resistance of the body

A current of 0.016 amperes is equal to ? . a.0.16 mA b.1.6 mA c.16 mA d.160 mA

C. 16 mA

A short shock with a time duration of 0.03 seconds and a body current of ? can have the same result as a longer shock (3.0 seconds) with a body current of 0.1 amperes. a.50 mA b.75 mA c.1 A d.3 A

C. 1A

A body current of ? will result in certain death from a 0.03-second shock. a.500 mA b.1 A c.2.75 A d.5 A

C. 2.75 A

The research discussed in the reference material considers a longer shock, in which current flows for a duration of ? . a.0.03 seconds b.0.33 seconds c.3 seconds d.33 seconds

C. 3 seconds

The most serious current path through the body occurs through ? contact. a.foot to foot b.foot to hand c.hand to hand d.hip to hand

C. Hand to hand

Higher body current levels occur when ? . a.a worker is wearing clothing made from synthetic fabrics b.an electrical arc flash occurs c.the skin is punctured d.two workers form a series circuit

C. The skin is punctured

A painful and severe shock, causing difficulty in breathing and muscle contraction, will occur in men with a body current of ? . a.0.009 A b.0.015 A c.0.018 A d.0.023 A

D. 0.023A

To return the heart to a rhythmic beat, ? . a.administer chest compressions b.place the patient in rescue position c.treat for shock d.use an AED

D. Use an AED

The formula is used to calculate ? . a.available fault current b.long shock current c.short shock current d.worker body current

D. Worker body current

Voltage flow through the human body causes burning of body tissues. Select one: True False

False

The human body can withstand a higher current for a shorter time or a lower current for a longer time and avoid heart fibrillation. Select one: True False

True

The human body is not designed to handle even the most minimal of electrical currents. Select one: True False

True

The perception and let-go current thresholds differ from men to women. Select one: True False

True

The speed at which overcurrent protection devices operate must be considered when determining worker protection methods. Select one: True False

True

The type of boots and gloves worn can affect the resistance across worker contact points. Select one: True False

True

Tests to evaluate the body's reaction to low currents were conducted on volunteers by ? . a.Charles Dalziel b.Thomas Edison c.Michael Faraday d.Nikola Tesla

a.Charles Dalziel

An assumed body resistance of ? , while an approximation, allows calculations to be made for worker protection methods. a.10 Ω b.100 Ω c.1,000 Ω d.10,000 Ω

c.1,000 Ω

When contact is made with a line energized at ? or more, the outer skin can be punctured, allowing higher currents to flow through inner-body tissues. a.120 V b.240 V c.480 V d.1,000 V

d.1,000 V