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This MCQ is based on Semiconductor -Electronics: Materials, Devices and Simple Circuits which includes the following topics Holes and Electrons Band Theory, Properties of Semiconductors, Types of Semiconductors, Intrinsic Semiconductor, Extrinsic Semiconductor, N-Type Semiconductor, P-Type Semiconductor, Intrinsic vs Extrinsic, and Applications.
For the depletion region of a diode which one is incorrect?
To reduce the ripples in a rectifier circuit with capacitor filter which one is false?
Carbon, silicon and germanium have four valence electrons each. These are characterised by valence and conduction bands separated by energy band gap respectively equal to (Eg)C, (Eg)Si and (Eg) Ge. Which of the following statements is true?
Winch of the following gate is not an universal gate?
Number of electrons in the valence shell of a semiconductor is:
Calculate the value of peak reverse voltage (P.I.V.) if the full-wave rectifier has an alternating voltage of 300 V.
What is the rms value of output current if the peak value of output current is given as 0.092 A?
Find the value of output direct current if the peak value of output current is given as 0.095 A.
An alternating voltage of 360 V, 50 Hz is applied to a full-wave rectifier. The internal resistance of each diode is 100 W. If RL = 5 kW, then what is the peak value of output current?
What is the ripple factor for a half-wave rectifier?
In a p-type semiconductor, current conduction is by:
Atoms
Holes
Electrons
Protons
Main function of a transistor is to :
Rectify
Simplify
Amplify
All the above
With fall of temperature, the forbidden energy gap of a semiconductor
Increases
Decreases
Sometimes increases and sometimes decreases
Remains unchanged
Semiconductors of both p-type and n-type are produced by:
Ionic solids
Covalent solids
Metallic solids
Molecular solids
In semi conductor, at room temperature :
The valence bond is partially empty and the conduction band is partially filled
The valence band is completely filled and the conduction band is partially filled
The valence band is completely filled
The conduction band is completely empty
In intrinsic semiconductor at room temperature, the number of electrons and holes are:
Equal
Unequal
Infinite
Zero
In an unbiased p-n junction, holes diffuse from the p-region to n-region because
Free electrons in the n-region attract them.
They move across the junction by the potential difference.
Hole concentration in p-region is more as compared to n-region.
All the above.
Hole is
An anti-particle of electron.
A vacancy created when an electron leaves a covalent bond.
Absence of free electrons.
An artificially created particle.
Zener diode is used for:
Producing oscillations in a oscillator
Amplification
Stabilisation
Regulator
p-n junction diode can be used as:
Amplifier
Oscillator
Rectifier
Modulator
