Electronics Information · Practice test 7

Question 1Not answered

Conventional current is described as flowing

1. from the negative terminal to the positive
2. from the positive terminal to the negative
3. in both directions at the same time
4. only through the ground conductor

Question 2Not answered

The proper first action if you find a coworker still in contact with an energized conductor is to

1. grab the coworker directly with your bare hands
2. pour water on the coworker to cool them down
3. cut power to the circuit or use a non-conductive object to separate them from it
4. wait for the coworker to release the conductor on their own

Question 3Not answered

A circuit breaker that trips repeatedly under normal household load most likely indicates

1. that the breaker itself needs no further attention
2. that a lower-rated breaker should be installed
3. a fault or overload somewhere on that circuit
4. that the wiring is oversized for the load

Question 4Not answered

Which best describes how a diode behaves in a circuit?

1. It conducts equally in either direction
2. It conducts only above a set temperature
3. It conducts one way and blocks the other
4. It conducts only while the circuit is open

Question 5Not answered

A battery supplies direct current because the chemical reaction inside it

1. reverses polarity many times each second
2. only operates when connected to an AC source
3. pushes charge from one terminal to the other in a fixed direction
4. generates current through electromagnetic induction

Question 6Not answered

In a schematic diagram, two parallel lines of equal length, one straight and one curved, are used to represent

1. a capacitor
2. a resistor
3. an inductor
4. a switch

Question 7Not answered

A lead-acid battery, like the type used to start a car, is an example of a

1. primary, non-rechargeable cell
2. secondary, rechargeable cell
3. capacitor bank rather than a battery
4. solar cell

Question 8Not answered

A device draws 2 amperes at 9 volts. What is its power consumption?

1. 18 watts
2. 4.5 watts
3. 11 watts
4. 36 watts

Question 9Not answered

A 2000 watt space heater runs for 3 hours. How much energy does it consume?

1. 6 kilowatt-hours
2. 600 kilowatt-hours
3. 0.6 kilowatt-hours
4. 666 kilowatt-hours

Question 10Not answered

As the gauge number of a wire increases, the wire

1. becomes thinner and carries less current
2. becomes thicker and carries more current
3. keeps the same diameter but grows longer
4. loses resistance along its whole length

Question 11Not answered

A series-parallel circuit is one that

1. switches between series and parallel automatically
2. contains both series and parallel connections
3. has exactly two components in each branch
4. carries alternating current in both directions

Question 12Not answered

A component dissipating 20 watts operates at 10 volts. What current does it draw?

1. 2 amperes
2. 200 amperes
3. 0.5 amperes
4. 30 amperes

Question 13Not answered

An inductor is most simply constructed as

1. two metal plates separated by an insulator
2. a coil of insulated wire, often wound around a core
3. a length of wire doped with impurities
4. a strip of metal that melts under overcurrent

Question 14Not answered

The quantity of electric charge is measured in

1. amperes
2. joules
3. coulombs
4. ohms

Question 15Not answered

A zener diode is specifically designed to

1. block current equally well in both directions
2. maintain a steady voltage when operated in reverse breakdown
3. amplify a weak signal into a stronger one
4. convert light falling on it into a small voltage

Question 16Not answered

Rubbing a plastic comb with wool typically leaves the comb

1. positively charged, because it picks up extra electrons
2. negatively charged, because it picks up extra electrons
3. neutral, because friction cannot transfer charge
4. magnetized, because friction creates a magnetic field

Question 17Not answered

A soldering iron rated at 480 watts on a 240 volt supply draws how much current?

1. 115200 amperes
2. 0.5 amperes
3. 20 amperes
4. 2 amperes

Question 18Not answered

An open circuit is one in which

1. current bypasses the load entirely
2. the path is broken so no current flows
3. the voltage exceeds the rated value
4. two conductors touch each other

Question 19Not answered

A single-pole, double-throw switch is best suited to a circuit that must

1. control two entirely separate circuits at once
2. vary resistance smoothly rather than switch it
3. route power to either of two different paths from one source
4. open and close only one fixed path

Question 20Not answered

An appliance uses 5 kilowatt-hours of energy while running for 5 hours. What is its power rating?

1. 25000 watts
2. 1 watt
3. 1000 watts
4. 100 watts