Electronics meh

What is a varistor?

• a voltage-dependent resistor

• a voltage-dependent diode

• a current-dependent resistor

• a current-dependent diode

Which type of transformer is required to create a 180 degree input to a rectifier?

• center-tapped secondary

• step-down secondary

• stepped-up secondary

• split winding primary

What circuit activity may shift a characteristic curve so that diode operating points are different?

• higher power (heat)

• higher resistance

• lower voltage

• lower current

What is wrong with this diode?

• open

• short

• nothing

• not enough data

The dc current through each diode in a bridge rectifier equals:

• the load current

• half the dc load current

• twice the dc load current

• one-fourth the dc load current

When matching polarity connections have been made and the potential difference (PD) is above 0.7 V, the diode is considered to be:

• not working

• forward biased

• reverse biased

• an open switch

In a power supply diagram, which block indicates a smooth dc output?

• transformer

• filter

• rectifier

• regulator

If a 169.7 V half-wave peak has an average voltage of 54 V, what is the average of two full-wave peaks?

• 119.9 V

• 108.0 V

• 115.7 V

• 339.4 V

What is the current through the LED?

• 0 mA

• 23 mA

• 18 mA

• 13 mA

The characteristic curve for the complex model of a silicon diode shows that

• the barrier potential is 0 V

• the barrier potential stays fixed at 0.7 V

• the barrier potential increases slightly with an increase in current

• the barrier potential decreases slightly with an increase in current