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WorksheetsAnalog Electronics
Total questions: 46
Worksheet time: 23mins
BJT is biased to _________ ?
Work as a switch
Prevent thermal runaway
Increase DC collector current
Operate it in the saturation region
S2=151,S1=150, Circuit1 has better stability
S2=100,S1=10,Circuit 2 has better stability
S2=151, S1=10.3, Circuit 1 has better stability
S2=151, S1=10.3, Circuit has better stability
5 mA
4.807mA
4.5mA
5.2 mA
Why is self bias circuit not used in IC amplifier?
To reduce power losses
To reduce area used on the chip
Stability factor reduces in the IC
Voltage gain is reduced
Reverse saturation current of a common emitter transistor is __________
Collector current when emitter is open circuited and base-collector junction is reverse biased
Emitter current when collector is open circuited and base-collector junction is reverse biased
Base current when emitter circuit is open circuited and emitter-collector junction is reverse biased
Collector current when base circuit is open circuited
Reverse collector saturation is greater than Reverse saturation current because of reverse collector saturation __________
Is ideal
Doesn’t include leakage current
They are same
Include avalanche multiplication current which is caused by the collision in collector junction
Which of the following statement about a common base transistor is true?
Very low input impedance
Very low output Impedance
Current gain is greater than unity
Voltage gain is very low
Which of the following statement about a common emitter transistor is true?
Very high input resistance
High output resistance
Current gain is less than unity
Voltage gain is very low
Which of the following statement about a common collector transistor is true?
Very low input impedance
Very high output impedance
Unity current gain
Unity voltage gain
Which of the following configuration is used as input stage of the multistage amplifier?
Common base configuration
Common emitter configuration
Common collector configuration
All configurations are equally suited
At saturation, which of these is not true for a BJT?
The collector current IC cannot increase further
The base current IB, cannot increase further
The collector-to-emitter voltage, VCE is due to the non-zero internal resistance of BJT
VCE(saturation) is the minimum voltage drop between C and E
For a transistor in saturation, which one is true ?
What is the ON resistance of a transistor?
3ms
1ms
2ms
5ms
How is BJT used as a faster switch?
By operating it in the saturation and cut-off region
By operating it in the active and cut-off region
By using it in strong saturation
By decreasing its ON resistance
The state amplifier has no input is not called ______________
Zero signal condition
Non-signal condition
Quiescent condition
Empty-signal condition
Which of the following is not considered for quiescent operating point?
DC collector-emitter voltage
DC collector current
DC base current
DC input voltage
R1
R2
Rc
RL
Which of the following statements is most correct to explain role of biasing circuit in the implementation of a transistor circuit?
It is used provide proper voltage to every component in the circuit
It is used to ensure maximum power is obtained out of the circuit
It is used to provide the quiescent collector current
It is used to provide proper and stable functional environment to all quiescent point parameters
What is the role of input capacitance in the transistor amplifying circuit?
To prevent input variation from reaching output
To prevent DC content in the input from reaching transistor
There isn’t any role for input capacitance
To increase input impedance
Which of the following is actually not a function of emitter bypass capacitor?
Increase gain
Lower the impedance of emitter resistance
Provide a low reactance path
Help emitter resistance to withstand voltage variation
What is the role of emitter resistance in the transistor amplifying circuit?
To prevent thermal runaway
To prevent increase in gain
To lower the output impedance
To increase gain
Which of the following is not true regarding the output capacitor in the transistor biasing circuit?
To pass AC signal
To stop DC signal
To couple the amplifier to load or next amplifier
There is no importance for an output capacitance
Which of the following is the best biasing method for transistor bias?
emitter bias
voltage divider bias
fixed bias
collector feedback bias
Which of the following statement is incorrect?
Output of CE amplifier is out of phase with respect to its input
CC amplifier is a voltage buffer
CB amplifier is a voltage buffer
CE amplifier is used as an audio (low frequency) amplifier
C3,C1,C4
C4, C1, C2
C2, C3, C2
C4, C3, C2
-278
-277.9
-300
-280
28mA
280mA
2.5A
2A
•Which of the following oscillators is suitable for frequencies in the range of mega hertz?
To prevent a DC return between source and load, it is necessary to use ………………
resistor between source and load
inductor between source and load
capacitor between source and load
Both resistor and inductor between source and load.
Which of the following statement is true ?
Negative feedback in an amplifier _______ .
reduces gain
increase frequency and phase distortion
reduces bandwidth
increases noise
The abbreviation PIV in the case of a diode stands for ____________
Peak Inferior Voltage
Problematic Inverse Voltage
Peak Inverse Voltage
Peak Internal Voltage
The diode current equation is not applicable in ____________
Forward biased state
Reverse biased state
Unbiased state
It is applicable in all bias states
What happens to cut-in voltage when the temperature increases?
Cut-in voltage increases
Cut-in voltage decreases
Cut-in voltage either increases or decreases
Cut-in voltage doesn’t depend on temperature
When temperature increases, reverse saturation current _________
Increases
Decreases
Doesn’t depend on temperature
Either increases or decreases
JFET is a ______ carrier device.
Unipolar
Bipolar
Minority
Majority
The n-channel JFET, the pinch off voltage is ______________
not greater than 0
greater than or equal to 0
less than or equal to 0
not less than 0
If the doping concentration of the gate increases, the internal pinch-off voltage ___________
Increases logarithmically
Increases linearly
Increases exponentially
Decreases linearly
The cut-off frequency of a JFET is ___________
linearly related to the transconductance of the JFET
inversely proportional to the transconductance of the JFET
exponentially related to the transconductance of the JFET
logarithmically related to the transconductance of the JFET
How is the transconductance at saturation related to the pinch off voltage of the JFET?
Inversely proportional
Directly proportional
Inverse-squarely related
Directly and proportional to square of the pinch-off voltage
5mA
0.5A
0.125A
0.3A
A first-order Butterworth low pass filter is an interconnection of ____________ and ___________
Single low pass RC circuit, Voltage follower
Low pass RC circuit, Band-pass RC circuit
Low pass RC circuit, LC feedback
Single low pass RC circuit, Power amplifier
Considering a second-order Butterworth LPF using an op-amp, where damping factor = 1.414 find the value of R3, given the following circuit. (R2=5kΩ)
6.71 kΩ
4.22 kΩ
2.93 kΩ
5 kΩ
Maximum gain = 22, Phase shift = 45°
Maximum gain = 23, Phase shift = 135°
Maximum gain = 22, Phase shift = 225°
Maximum gain = 23, Phase shift = 45°
