Intro to Semiconductors
True or False:
An electron is a negatively charged particle
True
For a silicon diode, the value of the forward bias voltage typically is:
Greater than 0.7 volts
True or False:
A basic half-wave rectifier consists of one diode
True
True or False:
A smaller filter capacitor reduces the ripple
False
If one of the diodes in a bridge full wave rectifier opens, the output is:
A half wave rectified voltage
These electrons are in the most distant orbit from the nucleus
Valence electrons
A diode conducts current when it is:
Forward biased
The average value of a half-wave rectified voltage with a peak value of 200 V is:
63.7 Volts
The ideal dc output of a capacitor-input filter is equal to:
The peak value of the rectified voltage
If you are checking a 60 Hz full wave rectifier and observe that the output has a 60 Hz ripple, what is the problem?
There is an open diode
The most widely used semiconductive material in electronic devices is:
Silicon
Ideally, a diode can be represented by a:
Switch
The average value of a Full wave rectified voltage with a peak value of 75 volts is:
47.8 Volts
A 60 V peak full-wave rectified voltage is applied to a capacitor-filter. If the frequency = 120 Hz, RL = 10 Kiloohms and C = 10 microfarads, the ripple voltage is:
5 Volts
In testing the power supply circuit, you find that the voltage at the positive side of the filter capacitor has a 60 Hz ripple voltage. You replace the bridge rectifier and check again, and it still has the 60 Hz ripple? What now?
The rectifier must be connected backwards
The boundary of a p-type and a n-type material is called:
A pn junction
When a silicon diode is working properly in forward bias, a DMM in the diode test position will indicate:
Approximately 0.7 Volts
A Bridge Rectifier uses ________ diodes
Four
If the load resistance of a capacitor filtered full wave rectifier is reduced, the ripple voltage __________
Increases
A full wave rectifier with a capacitor input filter provides a DC output voltage of 35 V to a 3300 ohm load. What is the minimum value of filter capacitor if the maximum peak-to-peak ripple voltage is 0.5 V?
177 microfared
The term bias means:
A DC voltage applied to control the operation of a device
When a diode is open, a DMM will generally indicate:
OL
The total secondary voltage in a center-tapped full wave rectifier is 125 Volts RMS. What is the RMS output voltage?
62.5 Volts
True or False:
The purpose of the capacitor filter in a rectifier is to convert AC to DC
False
A voltage doubler has 20 V RMS on its input. What is the output voltage?
56.6 V Peak