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WorksheetsEDC CAT - 3 EXAM
Total questions: 60
Worksheet time: 10mins
What is the term for the electromagnetic field between the acceptor and donor ions in a PN junction when there is no external voltage applied?
Peak
Barrier
Base
Path
In a PN junction, the charges on both sides of the electric field barrier are due to these charges
Majority carriers
Minority carriers
Both (a) and (b)
Fixed ions and mobile ions
What happens to a negative bias PN junction?
Increases when negative bias increases
Decreases when negative bias increases
Increases when negative bias decreases
Is very low
In a non-degenerate PN junction
Current in the junction occurs only due to a small number of carriers
The current in the junction is zero when in equilibrium, because equal but opposite carriers cross the junction
The current in the junction decreases with an increase in temperature
The current in the junction is zero when in equilibrium, because charges do not cross the junction
In a PN junction diode, the reverse bias can have
Some milliamperes
Between 0.2 A and 15 A
Some amperes
Some micro or nano amperes
When the PN junction is in the forward bias, what happens when the battery voltage increases?
Resistance increases
Current increases in the PN junction
Current decreases in the PN junction
None of the above occurs
What happens when a PN junction is under reverse bias?
Holes and electrons tend to concentrate near the junction
The barrier breaks down
Holes and electrons tend to move away from the junction
None of the above
In a PN junction, when the applied voltage ........ exceeds the potential, the diode current becomes significant, this is called .............
forward, reverse voltage
reverse, reverse voltage
resistance, reverse voltage
barrier, forward voltage
When a PN junction is under forward bias voltage
The positive terminal of the battery is connected to the P-side and the negative terminal is connected to the N-side
The junction is connected to the ground
The N-side is directly connected to the P-side
The positive terminal of the battery is connected to the N-side and the negative terminal is connected to the P-side
A PN connection
There is low resistance in both forward and reverse directions
There is high resistance in both forward and reverse directions
Works only in the forward direction
Works only in the reverse direction
Failure of the PN junction below 5 V is primarily caused by
Avalanche breakdown
Zener breakdown
Either (a) or (b)
None of the above
When a PN junction is under forward bias voltage
Electrons and holes tend to move away from the junction
The measuring area decreases
The barrier breaks down
None of the above
In a variable PN connection, the current increases steadily through the connection
Where is a diode used?
Digital circuits
Detectors
Rectifiers
All of the above
How many doped regions does a transistor have?
1
2
3
4
What is an important function of transistors?
Amplifying weak signals
Regulating series voltage
Modulating voltage
Generating light
Who invented the first junction transistor?
Bell
Faraday
Marconi
Shockley
In an npn transistor, what is the majority carrier in the base?
Free electrons
Holes
None
Both
The blocking capability across every silicon junction layer
0
0.3 V
0.7 V
1 V
Emitter diode is generally
used in the forward direction
reused
non-functional
function in the breakdown region
How should the collector diode be for cotton processing?
Forward-biased
Reverse-biased
Non-conducting
Operating in break-down mode
The basic type of an npn transistor is
heavily doped
lightly doped
metallic
doped with five evaluation materials
Where do the magnetic fields primarily flow based on an npn transistor?
Through the base lead
Into the collector
Into the emitter
Into the base supply
Transistors are generally not reconnected at the bottom because they
have a long lifespan
have a negative charge
must run long at the bottom
flow out from the bottom
Electromagnetic waves generally flow based on
They will flow into the collector
They will flow out of the base
They will recombine with the coils in the base
They will recombine with the coils of the collector
The current value of a transistor is
Collector current to emitter current
Collector current to base current
Base current to collector current
Emitter current to collector current
If the collector increases the electric pressure, what will increase?
Base electric
Collector electric
Discharge electric
None of the above
Due to the presence of only a few droplets in the base section, the base
Young shoot
Mineralization
Without droplets
None of the above
In a normally biased npn transistor, the electrons in the emitter have enough energy to overcome the base-emitter junction potential barrier.
Base-Emitter Junction
Base-Collector Junction
Collector-Base Junction
Recombination Path
A transistor functions like a diode and
through voltage
through data
resistance
power supply
Sanya is conducting an experiment to measure the base-emitter voltage in her electronics lab. What is the base-emitter voltage of the second approach?
0
0.3 V
0.7 V
1 V
The current ratio of IC/IE is generally less than one, and what is it called?
Beta
Delta
Alpha
Omega
What is the current ratio of the bat?
IC / IB
IC / IE
IC / IE
IE / IB
A collector's properties curve is:
Emitter current (IE) and collector-emitter voltage (VCE) (VBB) while keeping the base-emitter voltage constant
Collector current (IC) and collector-emitter voltage (VCE) (VBB) while keeping the base-emitter voltage constant
Collector current (IC) and collector-emitter voltage (VCE) (VBB) while keeping the base-emitter voltage constant
Collector current (IC) and collector-emitter voltage (VCC) (VBB) while keeping the base-emitter voltage constant
In a transistor, what controls the collector group:
Collector voltage
Base group
Collector resistance
All of the above
Total emitter current:
IE – IC
IC + IE
IB + IC
IB – IC
In a EDC lab, Rahul is experimenting with a transistor circuit. For a C-C configuration to function correctly, the collector-base junction must be reverse-biased, but which junction should be forward-biased?
Collector-Emitter
Base-Emitter
Collector-Base
Gate-Source
What are the conditions required to properly bias an NPN transistor amplifier?
Forward bias the base/emitter junction and reverse bias the base/collector junction.
Forward bias the collector/base junction and reverse bias the emitter/base junction.
Provide positive voltage to the n-type material and negative voltage to the p-type material.
Provide high current to the base.
In CB configuration, input resistance
High
Medium
Low
None of these
BJT is a ———– device
Bipolar
Unipolar
Constant Voltage
Constant Current
MOHITH is learning about electronics in his class. He wonders what transistors are used for.
Switch
Amplifier
Both (A) & (B)
None of these
What is FET?
Which of the following technologies is used for the enhancement of the type of MOSFET known as P-channel?
The emitter feedback is .................... loop
Voltage feedback
Data feedback
Both voltage and data feedback
None of the above
If a amplifier is supplied with a negative electric voltage, its output resistance ..............
will remain the same
will increase
will decrease
none of the above
When is negative feedback used in deep-sea environments?
To increase its output resistance
To decrease its output resistance
To stabilize the foundation of deep-sea environments
To stabilize the output level
A depth charge................ creates depth charges
Less
Not less
Modified
None of the above
A deep dive .................. uses feedback
Procedure
Counter
Neither procedure nor counter
Insufficient data
KIRAN is working on a project involving communication devices. She learns that the Hartley Oscillator is generally used in ..................
Radio receivers
Radio transmitters
TV receivers
None of the above
In a phase-shift oscillator, the components that are often determined are ............
L and C
R, L and C
R and C
None of the above
9. Most of the electrons in the base of an NPN transistor flow
a. Out of the base lead
b. Into the collector
c. Into the emitter
d. Into the base supply
36. In a transistor, collector current is controlled by:
A. collector voltage
B. base current
C. collector resistance
D. all of the above
60. FETs are preferred to BJTs at high frequencies because they are
A. Less noisy
B. Capable of handling highest frequencies
C. Easy to fabricate
D. All of the above
58. The input control parameter of a JFET is ……………
1. gate voltage
2. source voltage
3. drain voltage
4. gate current
54. A second condition for oscillations is ……………….
1. A gain of 1 around the feedback loop
2. No gain around the feedback loop
3.The attention of the feedback circuit must be one-third
4.The feedback circuit must be capacitive
53. One condition for oscillation is ………….
1. A phase shift around the feedback loop of 180 Degree
2. A gain around the feedback loop of one-third
3. A phase shift around the feedback loop of 0 Degree
4. A gain around the feedback loop of less than 1
55. A 2-transistor class B power amplifier is commonly called ……….. amplifier
1. Dual
2.Push-pull
3. Symmetrical
4.Differential
48. MAGESH is experimenting with a pendulum and observes that it produces……………. oscillations
1. Damped
2. Undamped
3. Modulated
4.None of the above
31. Which is beta's current ratio?
A. IC / IB
B. IC / IE
C. IC / IE
D. IE / IB
23. NITHIYA is working on a project where she needs to understand how a transistor behaves. She learns that a transistor acts like a diode and a
a. Voltage source
b. Current source
c. Resistance
d. Power supply
