Eduqas A-Level Electronics Semiconductors and power overview quiz quiz

$200\ \Omega$

$500\ \Omega$

$300\ \Omega$

$700\ \Omega$

Forward bias above 0.7 V

Cut-off

Saturation

Reverse breakdown

$5.0\ \text{mA}$

$0.5\ \text{mA}$

$2.5\ \text{mA}$

$50\ \text{mA}$

The BJT is voltage-controlled and the MOSFET is current-controlled

The BJT is current-controlled and the MOSFET is voltage-controlled

Both are current-controlled

Both are voltage-controlled

Exactly in phase with the input signal

90 degrees out of phase with the input

Inverted (180 degrees out of phase)

It depends entirely on the signal frequency

$h_{FE} \times I_C$

$\frac{h_{FE}}{I_C}$

Equal to the collector current

$\frac{I_C}{h_{FE}}$

$12.7\ \text{V}$

$9.0\ \text{V}$

$6.4\ \text{V}$

$25.5\ \text{V}$

It decreases

It increases

It stays the same

It becomes zero

Lower electrical noise

Simpler circuit

Much higher efficiency

Higher output voltage accuracy at all loads

To rectify the alternating current flowing through the coil

To increase the steady current that flows through the relay coil

To smooth the ripple on the supply rail feeding the coil

To provide a safe path for the inductive back-EMF on switch-off

A triac

A thyristor

A single diode

A Zener diode

$3.0\ \text{V}$

$9.0\ \text{V}$

$6.0\ \text{V}$

$12\ \text{V}$