WorksheetsDiodes and Applications
Total questions: 20
Worksheet time: 12mins
The reverse saturation current increases with an increase in
temperature
reverse bias voltage
A and B
the leakage current is unaffected
It is the process whereby an applied waveform of zero average value is changed to one that has a dc level.
(a)
A series diode circuit with a voltage source of 10 V is connected to a 500-Ω resistor. Determine the diode current.
18.6 mA
16.8 mA
14.8 mA
15.7 mA
A diode has a power rating of 5 W. If the diode voltage is 1.2 V and the diode current is 1.75 A, what is the power dissipation?
3.2 W
2.1 W
5.0 W
4.3 W
A half-wave rectifier uses a transformer having a primary to secondary ratio of 5:1. A supply voltage of 120 V, 60 Hz is applied to the primary of the transformer. The load has a value of 1 kΩ. Determine the dc load voltage using second approximation.
34 V
10.8 V
33.3 V
10.6 V
Determine the dc load voltage of a bridge rectifier with an input voltage of 120 V, 60 Hz applied to transformer having a 10:1 ratio.
15.6 V
4.97 V
9.93 V
10.36 V
The 1N4001 has a bulk resistance of 0.23 Ω. Determine the load current for a series diode circuit with V = 10 V, and RL = 10 Ω using the piecewise linear model.
0.547 A
0.453 A
0.875 A
0.909 A
•The average value of a full-wave rectified voltage with a peak value of 75 V is
53 V
47.8 V
37.5 V
23.9 V
When the peak output voltage is 100 V, the PIV for each diode in a center-tapped full-wave rectifier is (neglecting the diode drop)
100 V
200 V
141 V
50 V
When the rms output voltage of a bridge full-wave rectifier is 20 V, the peak inverse voltage across the diodes is (neglecting the diode drop)
20 V
40 V
28.3 V
56.6 V
If the load resistance of a capacitor-filtered full-wave rectifier is reduced, the ripple voltage
increases
decreases
is not affected
has a different frequency
Line regulation is determined by
load current
zener current and load current
changes in load resistance and output voltage
changes in output voltage and input voltage
Determine the thermal voltage at a temperature of 40 deg Celsius. Express answer in mV (nearest who number)
(a)
The region of positive and negative charges in a junction diode that is devoid of charge carriers is called
pn junction
Depletion region
Barrier potential
Threshold voltage
The voltage that exits due to the electric field established by the charges in the depletion region
Knee voltage
Depletion region
Barrier potential
Threshold voltage
The external voltage that must be applied at which the diode current increases significantly
Forward bias voltage
Breakdown voltage
Breakover voltage
Knee voltage
Predominant capacitive effect in a reverse biased diode is the
Diffusion capacitance
Transition capacitance
Junction capacitance
Reverse capacitance
The breakdown mechanism for diodes that are highly doped occurring at relatively lower reverse bias voltage is called
breakdown region
Zener breakdown
avalanche effect
avalanche breakdown
The maximum voltage that a diode can sustain in the reverse bias before entering the breakdown region.
breakdown potential
peak inverse voltage
reverse breakdown voltage
Zener voltage
Determine the output dc voltage of the circuit below. Use second approximation. Transformer has a turns ratio of 10:1. Assume the input ac voltage is 220 V instead of 120 V. Express final answer in 3 significant figures.
(a)
