Electronic Devices Exam Prep
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Electronic Devices Exam Prep
English 28 leveled MCQs Free
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Sample questions with model answers
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5 marks Long answer
With circuit diagram, explain the working of a full-wave centre-tapped rectifier. Also draw the waveform.
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A full-wave centre-tapped rectifier uses two diodes and provides full-wave rectification.
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5 marks Long answer
With circuit diagram, explain the working of a half-wave rectifier. Also draw the waveforms.
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A half-wave rectifier allows current to pass during one half-cycle of AC input.
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5 marks Long answer
Describe the operation of a JFET with the help of its output and transfer characteristics.
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JFET operates by controlling current flow through a channel with voltage applied to the gate.
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5 marks Long answer
A full-wave rectifier uses two diodes having internal resistance of $20\Omega$ each. The transformer RMS secondary voltage from centre to each end is 50V. Find $I_m$, $I_{dc}$, $I_{rms}$ and $V_{dc}$, if the load resistance is $980\Omega$.
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Calculate $I_m$, $I_{dc}$, $I_{rms}$, and $V_{dc}$ using the given values.
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5 marks Long answer
With circuit diagram, explain the input and output characteristics of an NPN transistor in CE configuration.
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In CE configuration, the input and output characteristics show the relationship between base current and collector current.
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5 marks Long answer
In a NPN transistor, $I_{dc} = 0.995$, $I_E = 10mA$, Leakage current $I_{co} = 0.5\mu A$. Determine $I_C$, $I_B$, $\beta_{dc}$ and $I_{CEO}$.
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Use the given values to calculate $I_C$, $I_B$, $\beta_{dc}$, and $I_{CEO}$.
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5 marks Long answer
List the properties of Negative feedback in Amplifier.
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Negative feedback reduces gain and improves stability and linearity.
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5 marks Long answer
The intrinsic stand-off ratio for a UJT is determined to be 0.6. If the interbase resistance is $10K\Omega$, what are the value of $R_{B1}$ and $R_{B2}$?
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Calculate $R_{B1}$ and $R_{B2}$ using the intrinsic stand-off ratio.
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5 marks Long answer
Describe the operation of a UJT and its characteristics.
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A UJT operates as a switching device with specific characteristics in its output curve.
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5 marks Long answer
Describe the working of Crystal Oscillator with circuit diagram.
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A crystal oscillator uses a quartz crystal to stabilize frequency and generate oscillations.
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5 marks Long answer
A 2MHz quartz crystal oscillator is specified to have $L = 0.52H$, $C_s = 0.012pf$, $C_p = 4pf$ and $R = 120\Omega$. Find Series resonance frequency '$f_s$', parallel Resonance frequency '$f_p$', and quality factor.
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Calculate $f_s$, $f_p$, and quality factor using the given parameters.
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5 marks Long answer
List the important key parameters of Amplifiers.
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Key parameters include gain, bandwidth, input/output impedance, and noise figure.
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5 marks Long answer
Deduce the rectification efficiency of a full-wave centre tapped rectifier.
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Rectification efficiency is derived from the output DC voltage and input AC voltage.
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1 marks Short answer
Silicon diode has a knee voltage of __________ volt.
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0.7
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1 marks Short answer
The maximum rectification efficiency of a full-wave centre tapped rectifier is __________ %.
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81.2
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1 marks Short answer
Zener diode utilizes __________ characteristics for its operation.
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reverse breakdown
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1 marks Short answer
In an NPN transistor __________ are the majority carriers.
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electrons
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1 marks Short answer
The process of adding impurities to a semiconductor is called __________.
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doping
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1 marks Short answer
If the positive terminal of the battery is connected to the Anode, then it is known as
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Forward bias
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1 marks Short answer
In an NPN Transistor, the arrow is pointed towards
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The Emitter
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1 marks Short answer
What is the intrinsic stand-off ratio 'n' of a Unijunction transistor when $R_{B1} = 10K\Omega$ and $R_{BB} = 15K\Omega$
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0.67
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1 marks Short answer
The control element of a Silicon Controlled Rectifier is
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Gate
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1 marks Short answer
An SCR is a __________ triggered device
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Voltage as well as Current
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1 marks Short answer
Negative feedback in an Amplifier
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Reduce gain
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1 marks Short answer
A TRIAC is a __________
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Bilateral device
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1 marks Short answer
An Oscillator converts
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DC power into AC power
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1 marks Short answer
MOSFET is a __________ device
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All of the above
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1 marks Short answer
A JFET has three terminals, namely
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Source, Gate, Drain
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