SQA Higher Engineering Science Area 2 Electronics and control overview quiz quiz

A signal that has only two discrete levels, high or low

A signal that is always exactly zero volts

A signal produced only by a logic gate output

A signal that varies continuously and can take any value in a range

Output, process, input

Process, output, input

Input, process, output

Input, output, process

8 ohms

2 ohms

4 ohms

0.5 ohms

P equals V squared over R

P equals IV

P equals V over I

P equals I squared R

that resistor divided by the total resistance

the total resistance divided by that resistor

that resistor multiplied by the total resistance

the current divided by that resistor

It stays exactly constant at all temperatures

It decreases

It increases steadily without limit

It becomes infinite

It falls towards zero

It stays the same

It increases

It reverses its polarity

+4

-4

+0.25

-0.25

When the inverting input is higher than the non-inverting input

When both inputs are at exactly zero volts

Only when the supply is switched off

When the non-inverting input is higher than the inverting input

A small signal at its base or gate

The colour of the output device

The length of the connecting wires

The ambient air pressure

To increase the speed of the motor

To safely conduct the back-emf when the motor switches off

To convert the motor's output into light

To reduce the supply voltage to the motor

When at least one input is 1

When both inputs are 0

Only when both inputs are 1

When the inputs are different from each other

1

0

It depends on the supply

Both 1 and 0

0

1

It cannot be determined

2

500 ohms

200 ohms

300 ohms

700 ohms

Because a logic output supplies too little current to drive it directly

Because the motor would otherwise run backwards

Because logic gates only work in the dark

Because a transistor produces light as well