Free Printable AC Webxam Review 1

1.

What formula is pictured?

a)

Inductive Reactance

b)

Capacitive Reactance

c)

Z in Series

d)

Z in parallel

2.

Which of the following is true about Ground Fault Circuit Interrupters (GFCIs)?

a)

They don't need to be tested regularly

b)

GFCIs test for electrocution

c)

There is only one type of GFCI

d)

Each type of GFCI needs to be tested per the guidelines of the type

3.

A Ground Fault Circuit Interrupter (GFCI) is designed to do which of the following?

a)

Detect Ground Faults

b)

Detect any amount of electricity

c)

Shut down the power to the entire grid upon detection of a fault

4.

A weightlifter lifts two 300 newton weights 1.5 meters off the ground. How much work has he done?

a)

600 J

b)

660 J

c)

900 J

d)

1200 J

5.

You do 90 joules of work in 30 seconds. How much power have you generated?

a)

30 watts

b)

3 watts

c)

120 watts

d)

270 watts

6.

The current in the wires of a circuit is 90.0 milliAmps. If the light bulb was replaced by one with double the original resistance and the battery is replaced by one with triple the original voltage, then its new current would be _____ milliAmps.

a)

15 milliAmps

b)

60 milliAmps

c)

135 milliAmps

d)

540 milliamps

7.

A1 measures 50 milliamps. A3 measures 20 milliamps. What would A2 measure?

a)

70 ma

b)

24 ma

c)

30 ma

d)

50 ma

8.

Which of the following is symbol of capacitor ?

a)

b)

c)

d)

9.

Capacitance is measured in___________

a)

Coulombs

b)

Farads

c)

Hz

d)

Volts

10.

The picture and symbol of capacitor to the right represents:

a)

non-polarized

b)

polarized

c)

variable

d)

preset

11.

The picture and symbol of capacitor to the right represents:

a)

non-polarized capacitor

b)

polarized capacitor

c)

variable

d)

preset

12.

What is a capacitor?

a)

A device that resists changes in voltage

b)

A device that stores electrical energy in an electric field

c)

A device that converts electrical energy into mechanical energy

d)

A device that increases the voltage of an electrical circuit

13.

When capacitors are connected in series, how is the total capacitance $C_{eq}$ calculated?

a)

$C_{eq}=C_1+C_2+C_3+...$

b)

$C_{eq}=\frac{1}{\frac{1}{C_1}+\frac{1}{C_2}+\frac{1}{C_3}+...}$

c)

$C_{total} = \frac{C_1 \cdot C_2 \cdot C_3 \cdot ...}{C_1 + C_2 + C_3 + ...}$

d)

$C_{eq}=\sqrt{C_1^2+C_2^2+C_3^2+...}$

14.

When capacitors are connected in parallel, how is the total capacitance $C_{eq}$ calculated?

a)

$C_{eq}=C_1+C_2+C_3+...$

b)

$C_{eq}=\frac{1}{\frac{1}{C_1}+\frac{1}{C_2}+\frac{1}{C_3}+...}$

c)

$C_{total} = \frac{C_1 \cdot C_2 \cdot C_3 \cdot ...}{C_1 + C_2 + C_3 + ...}$

d)

$C_{eq}=\sqrt{C_1^2+C_2^2+C_3^2+...}$

15.

What happens to the capacitance of a capacitor if the area of the plates is doubled?

a)

The capacitance is halved

b)

The capacitance remains the same

c)

The capacitance is doubled

d)

The capacitance is quadrupled

16.

What effect does increasing the distance between the plates of a capacitor have on its capacitance?

a)

Increases the capacitance

b)

Decreases the capacitance

c)

Has no effect on the capacitance

d)

Initially increases then decreases the capacitance

17.

In a series circuit of three capacitors with capacitances of 2F, 3F, and 6F, what is the total capacitance?

a)

11F

b)

1F

c)

$\frac{1}{11}$ F

d)

$\frac{1}{3}$ F

18.

Three identical 50 μF capacitors are arranged in parallel. Determine the overall capacitance of the circuit

a)

50 μF

b)

100 μF

c)

150 μF

d)

25 μF

e)

17 μF

19.

What are the factors that influence capacitance of a capacitor?

a)

Surface area

b)

Temperature

c)

Dielectric

d)

Length

e)

Distance between plates

20.

A 5uF, a 10uF and a 20uF capacitor are connected in SERIES to a 6V battery. Calculate the total equivalent capacitance of the circuit?

a)

35uF

b)

0,35uF

c)

2,857uF

d)

0,0286uF

21.

A 5uF, a 10uF and a 20uF capacitor are connected in PARALLEL to a 6V battery. Calculate the total equivalent capacitance of the circuit?

a)

35uF

b)

0,35uF

c)

2,857uF

d)

0,0286uF

22.

Frequency is measured in?

a)

Seconds

b)

Hertz

c)

Henries

d)

Farads

23.

Capacitive Reactance is measured in?

a)

Amps

b)

Volts

c)

Ohms

d)

Watts

24.

What formula is pictured?

a)

Inductive Reactance

b)

Capacitive Reactance

c)

EMF

d)

Power

25.

Inductance is the property in an electrical circuit that

a)

resists change in voltage

b)

creates magnetic flux

c)

resists change in current

d)

cancels magnetic fields

26.

The unit of measurement for the inductor is

a)

Farad

b)

Henry

c)

George

d)

Jones

27.

There are two 10H inductors in series. What is the total inductance?

a)

20

b)

10

c)

5

28.

there are two 10H inductors in parallel. Total inductance is...

a)

5

b)

10

c)

20

29.

What is L Total?

a)

5 uH

b)

10 uH

c)

3.33 uH

d)

5 mH

30.

To find L from the reactance equation, use:

a)

$\frac{1}{2\pi fL}$

b)

$\sqrt{2\pi fl}$

c)

$\frac{X_L}{2\pi f}$

d)

$\frac{X_L}{2\pi L}$

31.

How should you sit in your chair while keying?

a)

Feet flat on floor

b)

Legs stretched out

c)

Chair pulled out from table

d)

Feet crossed in a "X" position

32.

To reduce stress, you should

a)

Get enough sleep

b)

Eat right

c)

Exercise

d)

Be rude

33.

Define Ergonomics

a)

The science of designing computers

b)

This was not covered in lecture

c)

The science of designing equipment and workplace for a comfortable and safe environment

d)

The science of designing chairs

34.

ANSWER ONLY WITH NUMBERS and the prefix k or M (if necessary): A 4-band resistor colored orange, white, orange, gold has a value of...

(a)

35.

What are the first three bands of a

47\ k\Omega

resistor?

a)

yellow, violet, brown

b)

yellow, blue, orange

c)

orange, violet, yellow

d)

yellow, violet, orange

36.

What are the first three bands of a

2.7\ k\Omega

resistor?

a)

red, yellow, red

b)

red, violet, red

c)

red, violet, orange

d)

orange, blue, brown

37.

A resistor's first three colour bands are brown, black, and red. What is its value?

a)

10 ohms

b)

10 Kohms

c)

200 ohms

d)

1000 ohms

38.

A 47 Kohm resistor would have which colours on its first three bands?

a)

yellow, violet, white

b)

red, white, blue

c)

yellow, violet, orange

d)

orange, yellow, violet

39.

The meaning of NEC is

a)

non-metallic earth conductors

b)

National electrical code

c)

North eastern code

40.

Class A fires involve...

a)

Flammable liquids

b)

Flammable solids

c)

Reactive metals

d)

Fats and oil

41.

Class B fires involve...

a)

Flammable liquids

b)

Flammable solids

c)

Reactive metals

d)

Fats and oil

42.

Class E fires involve...

a)

Metals

b)

Fats and oils

c)

Flammable gases

d)

Electrical appliances

AC Webxam Review 1

Total questions: 42

Worksheet time: 33mins

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