The two basic electrical safety tests that should be performed on line powered equipment before
installation or after repairs are:
a input isolation and defibrillation protection
b ground wire integrity and ground wire leakage current
c exposed metal leakage and leakage current between leads
d proper polarity and contact tension - Answers b) ground wire integrity and ground wire leakage
current
The standard color coding of 115 VAC calls for the ground, neutral and hot wires to be colored as:
a green, white, black
b white, green, black
c orange, brown, green
d black, red, green - Answers a)) green, white, black
A reverse precaution sign on a patient's room indicated that the patient is
a infectious and may infect you
b has a compromised immune system and may be infected by you
c is on chemotherapy and cannot be disturbed
d is of no concern to a Biomed - Answers b)has a compromised immune system and may be infected by
you
4 Oxygen and nitrous oxide compressed gas cylinders should not
a be stored with protective caps in place
b be stored in an area cooler than normal room temperature
c be transported on a cart when secured with a metal chain
,d be stored in an area where readily combustible materials are present - Answers d be stored in an area
where readily combustible materials are present
The recommended test procedure for detecting the presence of electrical hazards in clinical settings is to
a observe the patients ECG for electrical interference
b observe the patient for indications of muscle twitching
c measure the presence of hazardous leakage currents using a specially designed microampmeter
d measure for stray or interference voltages using a Wheatstone bridge circuit - Answers c measure the
presence of hazardous leakage currents using a specially designed microampmeter
6 What basic electrical characteristic usually causes most leakage currents present in modern medical
equipment?
a capacitive reactance coupling
b inductive reactance coupling
c restive reactance coupling
d defective insulators - Answers d defective insulators
7 What is the typical cause of death in accidents involving electrocution?
a damage to the nervous system
b respiratory paralysis
c surface tissue destruction
d ventricular fibrillation - Answers d ventricular fibrillation
8 What is the safe "direct to the heart" current level?
a 10 uA
b 100 uA
c 500 uA
, d 1000 uA - Answers a 10 uA
9 The percentage of an external current flowing in the body from arm to arm that will pass through the
myocardium is about
a 0.1%
b 1.0%
c 10%
d 50% - Answers a 0.1%
10 In what two basically different ways can electrical currents flowing through the body affect tissues?
a alternating and pulsed
b fibrillation and tetany
c heating and stimulation
d tingling and jerking - Answers b fibrillation and tetany
11 When dealing with the general subject of electrical safety what basic dangers must be considered?
a shock and electrocutions
b explosions
c fires
d all of the above - Answers d all of the above
12 The hospitals essential electrical system shall be arranged that in the event of failure of normal
power, from the outside, the alternate source will be connected to the load within
a 1 second
b 10 seconds
c 1 minute