NEW
Font size
WorksheetsDiodes and Clipper
Total questions: 20
Worksheet time: 10mins
Main phenomenons associated with formation of p-n junctions are
Drift only
Diffusion only
Diffusion and Drift
only doping
The region on either side of the junction which becomes free from the mobile charge carriers is called
Energy gap region
Charge free region
Diffusion region
Depletion region
Characteristics of a diode that helps in rectification
Allows Unidirectional flow of current
Allows Bidirectional flow of current
Opposes the flow of current
conducts in reverse biased
Zener diodes are mostly used for
rectifier circuits
Filter Circuits
solar cells
Voltage regulator circuits
What are ripples
DC supplied by a cell
AC component in household circuits
AC component that remains in rectified circuit
AC component that remains in filtered circuit
What type of diode circuit is used to clip off portions of signal voltages above or below certain levels?
clipper or limiter
clamper
voltage regulator
none of the above
A Zener diode is based on the principle of:
Thermionic emission
Tunneling of charge carriers across the junction
Diffusion of charge carriers across the junction
None of the above
Silicon diode is less suited for low voltage rectifier operation because:
ts breakdown voltage is high
Its cut-in voltage is high
Its reverse saturation current is low
None of the above
A Zener diode:
Has a high forward voltage rating
Has a sharp breakdown at low reverse voltage
Is useful as an amplifier
None of the above
Which of these is a best description of a Zener diode?
It operates in the reverse region
It is a constant voltage device
It is a constant current device
None of the above
When two Zener diodes each of 10 V and 15 V are connected in series, then the overall voltage between them when they are in conduction is 10 V 25 V 15 V Zero
10v
25v
15v
zero
Varactor diodes are used in FM receivers to obtain:
Automatic frequency control
Automatic gain control
Automatic volume control
None of the above
Zener diodes are:
Specially doped p–n junctions
Normally doped p–n junctions
Lightly doped p–n junctions
None of the above
A general propose diode is more likely to suffer an avalanche breakdown rather than a Zener breakdown because:
It is lightly doped
It is heavily doped
It has weak covalent bonds
None of the above
The Zener effect is valid approximately:
Below 5 V
Above 5 V
Equal to 5 V
None of these
Each diode of full-wave centre-tapped rectifier conducts for:
360°
270°
90°
180°
The clipping action of a diode requires that its forward resistance:
Be zero
Have a finite value
Be infinite
None of the above
For a low voltage rectification:
Two diode full-wave rectifier is suitable
Both bridge and full-wave rectifier are suitable
Bridge rectifier is suitable
None of the above
The most significant component of ripple voltage in a half-wave rectifier is contained in:
Fundamental frequency
Second harmonic
DC component
None of the above
