Unit 3 Static Electricty

The imbalance that occurs during ___________ causes an object to either gain or lose electrons. A. static electricity B. lighting C. charging an object D. accumulating charge

Charging an object

In a clothes dryer, the greatest static charges generally are built up on ___________ fabrics. A. Man-made B. Natural

Man-made

Most lighting discharges associated with cloud occur between the cloud and the ground A. True B. False

False

The Precipitator uses a high-voltage DC power supply to provide a set of wires with a positive charge and a set of plates with a _______ charge. A. Negative B. Positive C. Neutral

Negative

Electrostatic charges occur on _______. A. Conductors B. Insulators

Insulators

In spray painting, the object to be painted has what _________ charge? A. Ground charge B. No charge C. Positive charge D. Negative charge

Negative charge

When using a dry copy machine, a dark powder that has what charge is applied to the drum? A. Ground charge B. No charge C. Positive charge D. Negative charge

Negative charge

Static electricity refers to electrons that _______ moving. A. Are B. Are not

Are Not

A lighting protection device that is grounded at one end, with the other end close to but not touching the object to be protected, is called lighting _________. A. Arrestor B. Catcher C. Umbrella D. Rod

Arrestor

Power lines are often protected by lighting __________ that exhibit a very high resistance at the normal voltage of the line.

Arrestors

Insulators are the only materials that can hold ________ stationary A. Elements B. Electrons

Electrons

Which of the following is an example of a nuisance static charge? A. An automobile moving through dry air B. Spray painting C. Lightning machine D. Lightning

An automobile moving through dry air

What would a truck carrying flammable materials use to avoid dangerous conditions due to static charges? A. Insulator B. Lightning arrestor C. Lighting rod D. Drag chain

Drag chain

Nuisance static charges are more likely to occur when the air is _______.

Dry

Within a lighting bolt, current flows _________. A. From positive to negative B. From negative to positive C. In both directions

From negative to positive

How can a person generally eliminate the accumulation of static charge in the home, especially when carpet exists? A. Use a carpet pad as in insulator B. Use a lighting rod. C. Install a humidifier D. Install a dehumidifier

Install a humidifier

Nylon is an excellent ____________ material and is used in most carpets. A. Insulating B. Resisting C. Attracting D. Grounding

Insulating

The Charge that accumulates on an object is determined by the ___________ used to produce the charge. A. Charge B. Current C. Materials D. Electrons

Materials

The shock that results from walking across a carpet and touching a doorknob is an example of a(n) _________ static charge. A. Nuisance B. Useful

Nuisance

Bringing a charge test object near the ball of a charged electroscope causes that leaves to move closer together. This indicates that the test object charge is the _________ polarity as the electroscope charge. A. Same B. Opposite

Opposite

As droplets of paint pass through the grid during, spray painting, what charge causes electrons to be removed from the paint droplets? A. Ground charge B. No charge C. Positive charge D. Negative charge

Positive charge

In spray painting, a high-voltage grid is placed in front of the spray gun. What charge does the grid have? A. Grounding charge B. No charge C. Positive charge D. Negative charge

Positive charge

When using a dry copy machine, a high-voltage wire located near the drum causes the selenium to have what charge as it rotates? A. Ground charge B. No charge C. Positive charge D. Negative charge

Positive charge

When an objective protected by a lighting ________ is struck by lightning bolt, it will bleed the lightning discharge to ground before the protected object can be harmed. A, Arrestor B. Umbrella C. Catcher D. Rod

Rod

The semiconductor material used as a coating on copy machine drums is _________. A. Aluminum B. Germanium C. Selenium D. Silicon

Selenium

Selenium is a(n) _________. A. conductor B. Insulator C. Semiconductor

Semiconductor

An electroscope can be used to determine the polarity of an electrostatic charge A. True B.False

True

Copy Machines operate on the principle of static electricity A. True B.False

True

Lighting is the result of static charges built up in clouds that contain a large amount of moisture A. True B. False

True

Lighting rods provide an easy path to ground for current to flow A. True B.False

True