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Exam 17: Electrical Hazards

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Question 1

Multiple Choice

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Which of the following circuit voltage levels results in the most frequent occurrence of electrocution?

A) 110v
B) 220v
C) 440v
D) 7800v

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Question 2

Multiple Choice

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When equipment is connected to a circuit having an "open ground," but equipped with a GFCI

A) a fuse will blow or a breaker will be tripped
B) the equipment will not operate
C) the GFCI will be tripped
D) the equipment will operate normally

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Question 3

Short Answer

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The diagram illustrates what type of tester?

"Reversed polarity" means that

Which of the following will result in the largest arc flash?

Even body perspiration can provide the dampness that can make electrical contact fatal.

Fibrillation is due primarily to

Explain why electric shock can arrest the heart.

Which of the following miswiring conditions is likely to cause a piece of equipment to continue to operate even after it is turned off?

Ordinary household 110v circuits are capable of electric shock but such shocks can be assumed to not be fatal.

The diagram illustrates what type of tester?

Which of the following circuit voltage levels results in the most frequent occurrence of electrocution?

The current drawn by a 60-watt table lamp circuit is approximately

"Double insulation" is permitted in lieu of

The diagram illustrates what type of tester?

When a receptacle wiring tester is plugged into a receptacle that is wired correctly

Public utility companies regulate the oscillation of alternating current to 60 hertz because this frequency has been found to be the most safe for exposure to the human heart muscle and thus to prevent most electrocutions.

Explain the limitations of the phrase "electricity follows the path of least resistance," as it pertains to electrocution hazards.

When the ground-fault current flows through a person's body,the 15-amp circuit breaker in the circuit will throw and protect the worker from electrocution.

The peak voltage for an ordinary household A.C.circuit is approximately