A real voltage source has
Zero internal resistance
Infinite internal resistance
A small internal resistance
A large internal resistance
If a load resistance is 100 Ω, a stiff voltage source has a resistance of
Less than 1 Ω
At least 10 Ω
More than 10 kΩ
Less than 10 kΩ
The Thevenin voltage is the same as the
Shorted-load voltage
Open-load voltage
Ideal source voltage
Norton voltage
An open resistor has
Infinite current through it
Zero voltage across it
Infinite voltage across it
Zero current through it
A shorted resistor has
The voltage out of an ideal voltage source
Is zero
Is constant
Depends on the value of load resistance
Depends on the internal resistance
Assume the valence electron is removed from a copper atom. The net charge of the atom becomes
0
+1
-1
+4
Which is the most widely used semiconductor?
Copper
Germanium
Silicon
None of the above
Silicon atoms combine into an orderly pattern called a
Covalent bond
Crystal
Semiconductor
Valence orbit
The flow of valence electrons to the right means that holes are flowing to the
Left
Right
Either way
Trivalent atoms have how many valence electrons?
1
3
4
5
Negative ions are atoms that have
Gained a proton
Lost a proton
Gained an electron
Lost an electron
What is the barrier potential of a silicon diode at room temperature?
0.3 V
0.7 V
1 V
2 mV per degree Celsius
The voltage where avalanche occurs is called the
Barrier potential
Depletion layer
Knee voltage
Breakdown voltage
When the diode current is large, the bias is
Forward
Inverse
Poor
Reverse
The knee voltage of a diode is approximately equal to the
Applied voltage
Forward voltage
The ideal diode is usually adequate when
Troubleshooting
Doing precise calculations
The source voltage is low
The load resistance is low
The second approximation works well when
Load resistance is high
Source voltage is high
All of the above
If the line frequency is 60 Hz, the output frequency of a bridge rectifier is
30 Hz
60 Hz
120 Hz
240 Hz
With the same secondary voltage and filter, which has the most ripple?
Half-wave rectifier
Full-wave rectifier
Bridge rectifier
Impossible to say
If the secondary voltage increases in a bridge rectifier with a capacitor-input filter, the load voltage will
Decrease
Stay the same
Increase
None of these
If the filter capacitance is increased, the ripple will
A circuit that removes positive or negative parts of a waveform is called a
Clamper
Clipper
Diode clamp
Limiter
With a half-wave rectified voltage across the load resistor load current flows for what part of a cycle?
0°
90°
180°
360°
A circuit that adds a positive or negative dc voltage to an input sine wave is called a