Eduqas GCSE Electronics analogue processing and timing overview quiz quiz

$-5$

$+5$

$-6$

$+0.2$

$4$

$5$

$-4$

$0.25$

To increase the gain to its maximum

To set a stable gain that depends only on the resistor ratio

To make the output snap between two levels

To remove the need for a power supply

$0$

$+1$

$-1$

Infinite

$f = \frac{1.44}{(R_1 + 2R_2)C}$

$f = 1.1RC$

$f = \frac{1.44}{(R_1 + R_2)C}$

$f = \frac{R_f}{R_\text{in}}$

It charges and discharges through equal resistors

It charges through $R_1 + R_2$ but discharges through only $R_2$, so the high time is longer

The capacitor never fully discharges

The supply voltage is too high

$0.5\ \text{s}$

$1.1\ \text{s}$

$1.0\ \text{s}$

$2.2\ \text{s}$

The monostable gives a single triggered pulse; the astable free-runs continuously

The monostable has no capacitor

The astable needs a trigger; the monostable does not

They are the same circuit

Full-wave rectified d.c.

Half-wave rectified d.c. (only the positive half-cycles)

A.c. at twice the frequency

A steady d.c. with no ripple

In series with the load; it blocks d.c.

In parallel with the load; it charges on peaks and discharges between them to fill the gaps

In series with the load; it increases the voltage

In parallel with the load; it rectifies the a.c.

The a.c. mains frequency

The small remaining variation in the output as the capacitor discharges between peaks

The forward voltage of the diodes

The gain of the regulator

A smaller smoothing capacitor

A larger smoothing capacitor

Drawing a larger load current

Using half-wave instead of full-wave rectification