WorksheetsSEMICONDUCTORS
Total questions: 20
Worksheet time: 10mins
Effectively, how many valence electrons are there in each atom within a silicon crystal?
1
2
4
8
The boundary between p-type material and n-type material is called
A diode
A reverse-biased diode
Pn junction
A forward-biased diode
When the reverse voltage increases from 5 to 10 V, the depletion later
Becomes smaller
Becomes larger
Is unaffected
Breaks down
What kind of a device is a diode?
Bilateral
Linear
Nonlinear
Unipolar
The ideal diode is usually adequate when
Troubleshooting
Doing precise calculations
The source voltage is low
The load resistance is low
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
A filtered full-wave rectifier voltage has a smaller ripple than does a half-wave rectifier voltage for the same load resistance and capacitor values because:
there is a shorter time between peaks
there is a longer time between peaks
the larger the ripple, the better the filtering action
none of the above
Testing a good diode with an ohmmeter should indicate
high resistance when forward or reverse biased
low resistance when forward or reverse biased
high resistance when reverse biased and low resistance when forward biased
high resistance when forward biased and low resistance when reverse biased
Shunting the ac component away from the load is the task of a:
transformer
filter
regulator
rectifier
The arrow in the schematic symbol of a diode points to
the n-type material, which is called the anode
the n-type material, which is called the cathode
the p-type material, which is called the anode
the p-type material, which is called the cathode
In BJT, what is the reason for biasing?
To turn the device off
To turn the device on
To stabilize the circuit
neutralize the device
When transistors are used in digital circuits they usually operate in the:
active region
breakdown region
saturation and cutoff regions
linear region
A current ratio of IC/IE is usually less than one and is called:
beta
theta
alpha
omega
Most of the electrons in the base of an NPN transistor flow:
out of the base lead
into the collector
into the emitter
into the base supply
For a C-C configuration to operate properly, the collector-base junction should be reverse biased, while forward bias should be applied to which junction?
collector-emitter
base-emitter
collector-base
cathode-anode
IDSS can be defined as:
the minimum possible drain current
the maximum possible current with VGS held at –4 V
the maximum possible current with VGS held at 0 V
the maximum drain current with the source shorted
With the E-MOSFET, when gate input voltage is zero, drain current is:
at saturation
zero
IDSS
widening the channel
When an input signal reduces the channel size, the process is called:
enhancement
substrate connecting
gate charge
depletion
