Electronics Information · Practice test 6

Question 1Not answered

A capacitor blocks the flow of

1. steady direct current, once it is fully charged
2. alternating current at any frequency
3. current of any kind under all conditions
4. current only while it is being charged

Question 2Not answered

Two 10 ohm resistors are connected in parallel. What is the total resistance?

1. 20 ohms
2. 10 ohms
3. 5 ohms
4. 100 ohms

Question 3Not answered

A 9 volt battery drives 0.5 ampere through a resistor. What is the resistor's value?

1. 4.5 ohms
2. 9.5 ohms
3. 18 ohms
4. 0.056 ohms

Question 4Not answered

An LED produces light when

1. current flows through it in either direction
2. current flows through it in the forward direction
3. it is heated by the surrounding circuit
4. voltage is applied with no current flowing

Question 5Not answered

Each branch of a parallel circuit sees a voltage that

1. is the same as every other branch
2. divides equally among the branches
3. is highest where resistance is least
4. depends on how many branches there are

Question 6Not answered

A 1200 watt appliance is plugged into a 120 volt outlet. How much current does it draw?

1. 100 amperes
2. 0.1 amperes
3. 10 amperes
4. 1320 amperes

Question 7Not answered

The tolerance band on a resistor's color code indicates

1. the resistor's maximum safe operating voltage
2. the exact resistance value in ohms
3. how far the actual resistance may vary from its marked value
4. the temperature at which the resistor will fail

Question 8Not answered

Voltage in an electrical circuit is best described as

1. the pressure that pushes current through the circuit
2. the rate at which charge flows past a point
3. the opposition the circuit offers to flow
4. the energy the circuit uses each second

Question 9Not answered

The coloured bands printed on a resistor indicate its

1. operating voltage
2. resistance value
3. physical size
4. date of manufacture

Question 10Not answered

Capacitance is measured in

1. henries
2. farads
3. coulombs
4. watts

Question 11Not answered

In a series-parallel network, the first step in finding the total resistance is usually to

1. measure the current at the supply terminals
2. assume all branches carry equal current
3. add every resistor's value regardless of arrangement
4. combine the parallel branches into a single equivalent resistance

Question 12Not answered

A properly grounded metal appliance case protects the user chiefly by

1. preventing the appliance from drawing any current
2. giving fault current a low-resistance path away from the user's body
3. raising the case to the same voltage as the live wire
4. insulating the case from the internal wiring

Question 13Not answered

A heat sink is fitted to an electronic component in order to

1. raise the component's operating voltage
2. insulate the component electrically
3. increase the current the component draws
4. carry heat away from the component

Question 14Not answered

An electric shock delivered to a person is caused directly by

1. voltage being present near the body
2. resistance building up on the skin's surface
3. current passing through body tissue
4. the frequency of the nearby power lines

Question 15Not answered

The main advantage of a circuit breaker over a fuse is that a breaker

1. reacts to overload far more slowly
2. allows a higher current before tripping
3. needs no connection to the circuit
4. can be reset instead of replaced

Question 16Not answered

In a series-parallel circuit, a component wired in series with a parallel group will

1. carry the full current supplied to that group
2. carry only a fraction of the group's total current
3. have no current through it at all
4. carry twice the current of the group

Question 17Not answered

If one branch of a parallel circuit develops an open, the remaining branches

1. stop operating as well
2. receive twice their normal voltage
3. reverse the direction of their current
4. continue to operate normally

Question 18Not answered

A 100 watt bulb is left on for 10 hours. How much energy does it consume?

1. 10 kilowatt-hours
2. 1000 kilowatt-hours
3. 1 kilowatt-hour
4. 0.1 kilowatt-hours

Question 19Not answered

In a schematic diagram, a zigzag line most commonly represents

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

Question 20Not answered

A short circuit is hazardous because

1. the supply voltage suddenly increases
2. current stops flowing without warning
3. current bypasses the load and rises sharply
4. the circuit resistance rises very quickly