NEW
Font size
WorksheetsTest 1_Unit 1
Total questions: 20
Worksheet time: 15mins
The ideal value of reverse resistance of diode is
High
Infinite
Zero
Very low
The.......................... converts a.c voltage to pulsating d.c voltage
Rectifier
Filter
Clipper
Clamper
For an ideal diode, forward voltage drop Vf =
0.7 V
0 V
0.3 V
1 V
The current at which Zener breakdown occurs is
Maximum current
Test current
Minimum current
Knee current
For a Zener diode having Vz = 6 V, the voltage across Zener diode is ...................Vz in Zener breakdown region
Higher than
Less than
Equal to
None of thses
Transformer Utilization Factor for Centre tapped Full wave rectifier is
0.287
0.692
0.811
None of these
The semiconductor material used for LED
GaAs
Silicon carbide
GaAsP
All the above
The photo diode always operates in
Reverse biased
Forward biased
In parallel with load
None of thses
The average value of a half –wave rectified voltage with a peak value of 200V is
63.7 V
127 V
141 V
200 V
The valence shell in a silicon atom has the number designation of
0
1
2
3
The LED works on principle of
Fluorescence
Hall effect
Electroluminescene
None of these
The energy band where free electrons exist is the
First band
Second band
Conduction band
Valence band
The photodiode is..............................................device
Photo emitter
Photo rejector
Photo detector
None of these
What is the efficiency achieved by Full wave rectifier
81.2%
40.6%
20.3%
92%
The process of converting intrinsic semiconductor into extrinsic semiconductor is called
Doping
Recombination
Atom modification
Ionization
Electrons in an p-type semiconductor are
Minority carriers that are thermally produced
Minority carriers that are produced by doping
Majority carriers that are thermally produced
Majority carriers that are produced by doping
Which of the options correct with respect to Ripple factor of Half wave Rectifier
0.964
0.482
2.12
1.21
Total current in a semiconductor is due to
Only Diffusion current
Only Drift current
Both Drift and Diffusion current
None of these
The Atomic Number of Germanium and Silicon respective is
32,14
14,32
29,14
32,29
In absence of incident light, reverse current flowing through Photodiode is
Photo current
Dark current
PIN current
None of thses
