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Flashcards in Electronics Information Deck (57)
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1

The farad is a unit of measurement for
a) Capacitance
b) Voltage
c) Power
d) Current

a) Capacitance

2

In electrical wiring, which of the following are proportional?
a) The insulation around the wire and the amount of the voltage
b) The length of the wire and the amount of the current
c) The insulation around the wire and the amount of the current
d) The diameter of the wire and the amount of the current

d) The diameter of the wire and the amount of the current

3

Regarding magnets, what is a measure of the quantity of magnetism?
a) Magnetic flux
b) Reluctance
c) Permeability
d) Retentivity

a) Magnetic flux

4

Silver is a better conductor of electricity but copper is used more often in electrical circuits. Why?
a) Copper is cheaper than silver
b) Copper is stronger than silver
c) Copper is less likely to be stolen than silver
d) Copper has a higher melting point than silver

a) Copper is cheaper than silver

5

In household electrical wiring, which color of insulation indicates the “hot” wire?
a) Copper
b) Black
c) Red
d) Green

b) Black

6

What is the primary difference between a rectifier and an inverter?
a) A rectifier strips out the DC portion of electricity while an inverter strips out the AC portion
b) A rectifier strips out the AC portion of electricity while an inverter strips out the DC portion
c) A rectifier converts AC input to DC while an inverter converts a DC input to AC
d) A rectifier multiplies DC power while an inverter multiplies AC power

c) A rectifier converts AC input to DC while an inverter converts a DC input to AC

7

In metals, increasing the temperature typically _____ conductivity?
a) Does nothing to
b) Increases
c) Doubles
d) Decreases

d) Decreases

8

Inductance is a factor in which of the following?
a) An AC circuit
b) Batteries connected in parallel
c) Determining connected in parallel
d) Determining energy stored by a capacitor
e) A DC circuit

a) An AC circuit

9

Which of the following is not a common type of battery?
a) Power cell
b) Deep cycle
c) Dry cell
d) Wet cell

a) Power cell

10

Which of the following is not true about a line drop?
a) It’s a decrease in voltage between two points on a line
b) It’s addressed by raising voltage and lowering current across the transmission line
c) It’s addressed by raising current and lowering voltage across the transmission line
d) It’s caused due to resistance

c) It’s addressed by raising current and lowering voltage across the transmission line

11

This is the circuit symbol for a ____
a) AC power supply
b) Transistor
c) Lamp
d) Resistor

d) Resistor

12

Which of these materials is not a good conductor of electricity?
a) Marble
b) Water
c) Bronze
d) Silver

a) Marble

13

Why is an insulator a poor conductor of electricity?
a) An insulator is made of organic material
b) An insulator has a crystalline structure
c) An insulator has a matrix structure
d) An insulator has few free electrons

d) An insulator has few free electrons

14

How would you connect 8 [6v 25A] batteries to achieve a combined power output of 6V 200A?
a) Parallel
b) Parallel-series
c) Series parallel
d) Series

a) Parallel

15

Use Ohm’s Law to calculate the value of voltage in this circuit if resistance = 30 ohms and current = 1.67 amps.
a) 25 volts
b) 17.96 volts
c) 50 volts
d) 100 volts

c) 50 volts

16

This is the circuit symbol for a ___
e) Transformer
f) Potentiometer
g) Ground
h) Rheostat

g) Ground

17

Which of the following is a characteristic of a conductor?
a) An example is an organic like cotton
b) An example is a metal like copper
c) Few free electrons
d) Low conductivity

b) An example is a metal like copper

18

Which of the following statements about a capacitor is false?
a) You should always discharge any capacitors before working on an electronic circuit
b) To discharge a capacitor safely, use a high wattage resistor comparable to the capacitance of the capacitor
c) It’s safe to touch a capacitor with your hands as long as it’s small
d) A capacitor remains charged even after the input voltage is removed

c) It’s safe to touch a capacitor with your hands as long as it’s small

19

This is the circuit symbol for a ____.
a) Transformer
b) Connected wires
c) Ground
d) Potentiometer

b) Connected wires

20

Which of the following is the preferred method for splicing wires?
a) Screw on connectors
b) Wrap in small gauge wire
c) Wire cutter
d) Soldering

d) Soldering

21

From what do photovoltaic cells produce their electrical energy?
a) Sun energy
b) Combustion energy
c) Chemical energy
d) Fusion energy

a) Sun energy

22

This is the circuit symbol for a ____
a) Potentiometer
b) Diode
c) Battery
d) Unconnected wires

a) Potentiometer

23

Which of these materials is not a good conductor of electricity?
a) Air
b) Carbon
c) Water
d) Bronze

a) Air

24

What is the frequency of most household electrical systems?
a) 60Hz
b) 220V
c) 220Hz
d) 60MHz

a) 60Hz

25

Which of the following is not a characteristic of batteries connected in parallel?
a) The positive terminal of one battery is connected to the positive terminal of the next
b) Two connections are made between each adjacent battery
c) One connection is made between each adjacent battery
d) Total current equals the sum of the individual battery currents

c) One connection is made between each adjacent battery

26

A rheostat is an adjustable
a) Voltmeter
b) Transistor
c) Resistor
d) AC power supply

c) Resistor

27

You would measure the amount of current through a circuit with a/an
a) Voltmeter
b) Ammeter
c) Battery
d) Ohmmeter

b) Ammeter

28

The diameter of a number 12 wire is ____ the diameter of a number 6 wire?
a) Less than
b) Twice
c) More than
d) Triple

a) Less than

29

What subatomic particle is responsible for electricity?
a) Volt
b) Ampere
c) Electron
d) Proton

c) Electron

30

The ohm is a unit of measurement for
a) Energy
b) Resistance
c) Frequency
d) Voltage

b) Resistance