ECS101_L02_Quiz_Solution
Safety in Electrical Environment - Quiz Solutions
Questions and Answers
The generation of charges by friction is called
(a) electrostatic charge
(b) triboelectric effect
(c) electrostatic induction
(d) none of the above
A device that has the highest sensitivity to electrostatic discharge (<250 V) is classified as:
(a) class 1
(b) class 3
(c) class 3B
(d) none of the above
The clothing that is good to wear in an ESD free environment is made of:
(a) polyester
(b) cotton
(c) wool
(d) none of the above
In ESD safe areas, the floor is made:
(a) conductive
(b) static
(c) heat dissipative
(d) none of the above
To remove static electricity from our body while working at a workstation in an ESD controlled room, we wear:
(a) cotton made clothes
(b) grounded wrist strap
(c) silk shirt
(d) none of the above
For storing or transporting ESD sensitive devices we use special bags that are made of the:
(a) metalized plastic foil
(b) static conductive layer
(c) static dissipative layer
(d) none of the above
Small glitch that may cause loss of information but ultimately the system goes back to normal operation is categorized as:
(a) latent ESD damage
(b) catastrophic ESD damage
(c) measurable ESD damage
(d) none of the above
Additional Questions
From the triboelectric series, which material has a tendency to retain the most negative charge?
(a) acetate
(b) cotton
(c) teflon
(d) none of the above
Ionizers are used when the relative humidity in an ESD-controlled room is:
(a) low
(b) high
(c) extreme
(d) none of the above
Example of the triboelectric effect is:
(a) walking on a carpet on a dry day
(b) unpacking a new piece of equipment with a plastic cover (wrapped in nylon sheet)
(c) clothes just taken out of the hot-air dryer
(d) all of the above
Creating electrical charge without physical contact is known as:
(a) the triboelectric effect
(b) remote charging
(c) friction
(d) none of the above
In order to have ESD you must have:
(a) accumulated static electricity
(b) conductor
(c) both of the above
(d) none of the above
Maximum permissible exposure depends on:
A. incident irradiance level
B. exposure time
C. both options above
D. none of the options above is correct
Danger signs are used for:
A. class 1 and class 2 lasers
B. class 3 and class 4 lasers
C. only class 4 lasers
D. none of the options above is correct
What class of lasers is the most dangerous to human eye?
A. 1
B. 2
C. 3
D. 4