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DC Review Part I-2020

Total questions: 20

Worksheet time: 10mins

Name
Class
Date
1.

A basic principle of electromagnetism: the magnetic field is ______________ to the current that created it.

a)

perpendicular

b)

180 degrees

c)

parallel to the current

d)

opposite

2.

Saturation is the condition where all the material has been completely magnetized. The domain theory says saturation occurs when all the _____________ are lined up in the same direction.

a)

domains

b)

atoms

c)

electrons

d)

protons

3.

The property that creates a magnetic field is called ________ force.

a)

magnetic

b)

electromotive

c)

magnetomotive

d)

magnetic flux

4.

>Like charges repel is the basic law of:

a)

attraction

b)

magnetism

c)

sameness

5.

What component is measured in ohms?

a)

capacitor

b)

coil

c)

resistor

d)

battery

6.

>Atoms have subatomic particles which are:

a)

fire, water, and oxygen

b)

Proton, electrons, and neutrons

c)

gas, charges, and force

7.

A electrical shock could cause a severe problem if current flows from one hand to the other, right through the heart. An immediate symptom could be _______________ or cardiac arrest.

a)

loss of vision

b)

loss of hearing

c)

fibrillation

d)

numbness

8.

The insulator is used to allow current or voltage to freely flow.

a)

True

b)

False

9.

Use caution when talking to someone that is operating equipment or working in electrical circuits. A distraction could cause:

a)

equipment to become damaged

b)

personal injury

c)

damage to metering equipment

d)

all of these

10.

The basic time-related power unit is the ______.

a)

farads

b)

ohm

c)

amp

d)

joule

11.

Store chemicals and used rags away from the work bench, ideally __________________ rated for the purpose.

a)

in a waste basket

b)

in a metal cabinet

c)

in the work bench drawer

d)

in a area where there are no fires

12.

>With Ohm's Law how could resistance be determined?

a)

Voltage squared

b)

Divide voltage by the current

c)

Resistance times the current

d)

Resistance squared

13.

_____________is an insulator, but not to be trusted around dangerous voltages. This becomes something of a conductor when wet.

a)

Phenolic material

b)

Paper

c)

Dry wood

d)

Epoxy

14.

The proper safety measures for high-current situations are

the same as for high voltage situations, with one addition:

a)

all jewelry should be removed

b)

only earrings should be removed

c)

only wallet chains should be removed

d)

only wrist watch should be removed

15.

The part of the multimeter used to measure current is:

a)

ammeter

b)

ohmmeter

c)

voltmeter

d)

wattmeter

16.

>A resistor that has a value of 200 and no tolerance(+/-) band. It has an acceptable value of:

a)

0.185Ω at 1%

b)

185Ω at 10%

c)

185Ω at 5%

d)

185Ω at 20%

17.

Atoms must contain two subatomic particles

a)

True

b)

False

18.

What type of fire extinguisher is used on electrical fires?

a)

Class A

b)

Class B

c)

Class C

d)

Class D

19.

>Circuit values for resistance and current are provided. Which can be used to determine voltage?

a)

E = IR

b)

E = I/R

c)

E = R/I

d)

E = I + R

20.

Safety googles are needed to protect your eyes from possible injury. As goggles age the likelihood of the plastic becoming brittle and cab be easily scratched or weakened.

a)

True

b)

False