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Physics
Semiconductor Electronics
Previous Years Questions

## MCQ (Single Correct Answer)

Identify the equivalent logic gate represented by the given circuit...
The incorrect statement about the property of a Zener diode is :
The collector current in a common base amplifier using n-p-n transistor is 24 mA. If 80% of the electrons released by the emitter is accepted by the c...
In the given circuits (a), (b) and (c), the potential drop across the two p-n junctions are equal in...
As the temperature increases, the electrical resistance
In half wave rectification, if the input frequency is 60 Hz, then the output frequency would be
The truth table for the given logic circuit is...
Consider the following statements (A) and (B) and identify the correct answer.(A) A Zener diode is connected in reverse bias, when used as a voltage r...
The electron concentration in an n-type semiconductor is the same as hole concentration in a p-type semiconductor. An external field (electric) is app...
For the given circuit, the input digital signals are applied at the terminals A, B and C. What would be the output at the terminal y? ...
For transistor action, which of the following statements is correct?
The increase in the width of the depletion region in a p-n junction diode is due to :
For the logic circuit shown, the truth table is : ...
The correct Boolean operation represented by the circuit diagram drawn is : ...
For a p-type semiconductor, which of the following statements is true?
In the circuit shown in the figure, the input voltage Vi is 20 V, VBE = 0 and VCE = 0. The values of IB , IC and $$\beta$$ are given by ...
In the combination of the following gates the output Y can be written in terms of inputs A and B as ...
In a p-n junction diode, change in temperature due to heating
Which one of the following represents forward bias diode ?
In a common emitter transistor amplifier the audio sgnal voltage across the collector is 3 V. The resistance of collector is 3 k$$\Omega$$. If curren...
The given electrical network is equivalent to ...
For CE transistor amplifier, the aufio signal voltage across the collector resistance of 2 k$$\Omega$$ is 4 V. If the current amplification factor of...
The given circuit has two ideal diodes connected as shown in the figure. The current flowing through the resistance R1 will be ...
What is the output Y in the following circuit, when all the three inputs A, B, C are first 0 and then 1 ? ...
To get output 1 for the following circuit, the correct choice for the input is ...
A npn transistor is connected in common emitter configuration in a given amplifier. A load resistance of 800 $$\Omega$$ is connected in the collector...
Consider the junction diode as ideal. The value of current flowing through AB is ...
The input signal given to a CE amplifier having a voltage gain of 150 is Vi = 2cos(15t + $${\pi \over 3}$$). The corresponding output signal will be ...
In the given figure, a diode D is connected to an external resistance R = 100 $$\Omega$$ and an e.m.f. of 3.5 V. If the barrier potential developed a...
Which logic gate is represented by the following combination of logic gates ? ...
If in a p-n junction, a square input signal of 10 V is applied, as shown, then the output across RL will be...
The given graph represents V-I characteristic for a semiconductor device. Which of the following statement is correct ? ...
The barrier potential of a p-n junction depends on (1)   type of semiconductor material (2)   amount of doping (3)   t...
The output from a NAND gate is divided into two in parallel and fed to another NAND gate. The resulting gate is a ...
In an unbiased p-n junction, holes diffuse from the p-region to n-region because of
One way in which the operation of a n-p-n transistor differs from that of a p-n-p
In a common emitter (CE) amplifier having a voltage gain G, the transistor used has transconductance 0.03 mho and current gain 25. If the above transi...
In a n-type semiconductor, which of the following statement is true.
The output (X) of the logic circuit shown ion figure will be ...
The input resistance of a silicon transistor is 100 $$\Omega$$. Base current is changed by 40 $$\mu$$A which results in a change in collector curren...
To get an output Y= 1 in given circuit which of the following input will be correct ? ...
Two ideal diodes are connected to a battery as shown in the circuit. The current supplied by the battery is ...
In a CE transistor amplifier, the audio signal voltage across the collector resistance of 2 k$$\Omega$$ is 2 V. If the base resistance is 1 k$$\Omega... C and Si both have same lattice structure; having 4 bonding electrons in each. However, C is insulator where as Si is intrinsic semiconductor. This is... Transfer characteristics [output voltage (V0) vs input voltage (Vi)] for a base biased transistor in CE configuration is as shown in the figure. For u... The figure shows a logic circuit with two inputs A and B and the output C. The voltage wave forms across A, B and C are as given. The logic circuit g... A Zener diode, having breakdown voltage equal to 15 V, is used in a voltage regulator circuit shown in figure. The current through the diode is ... In the following figure, the diodes which are forward biased, are ... Pure Si at 500 K has equal number of electron (ne) and hole (nh) concentrations of 1.5$$ \times $$1016 m$$-$$3. Doping by indium increases nh to 4.5... A transistor is operated in common emitter configuration at VC = 2 V such that a change in the base current from 100$$\mu $$A to 300$$\mu $$A produc... Symbolic representation of four logic gates are shown as Pick out which ones are for AND, NAND and NOT gates, respectively... If a small amount of antimony is added to germanium crystal In forward biasing of the p-n junction The following figure shows a logic gate circuit with two inputs A and B and the output Y. The voltage waveforms of A, B and Y are as given. The logi... For transistor action (1) Base, emitter and collector regions should have similar size and doping concentrations. (2) The base ... To get an output Y = 1 in given circuit which of the following input will be correct ? ... Which one of the following statement is false ? The device that can act as a complete electronic circuit is Which one of the following bonds produces a solid that reflects light in the visible region and whose electrical conductivity decreases with temperat... A common emitter amplifier has a voltage gain of 50, an input impedance of 100$$\Omega $$and an output impedance of 200$$\Omega $$. The power gain ... The symbolic representation of four logic gates are given below The logic symbols for OR, NOT and NAND gates are respectively... A transistor is operated in common-emitter configuration at VC = 2V such that a change in the base current from 100$$\mu $$A to 200$$\mu $$A produce... A p-n photodiode is fabricated from a semiconductor with a band gap of 2.5 eV. It can detect a signal of wavelength Sodium has body centred packing. Distance between two nearest atoms is 3.7$$\mathop A\limits^ \circ $$. The lattice parameter is A p-n photodiode is made of a material with a band gap of 2.0 eV. The minimum frequency of the radiation that can be absorbed by the material is nearl... The voltage gain of an amplifier with 9% negative feedback is 10. The voltage gain without feedback will be If the lattice parameter for a crystalline structure is 3.6$$\mathop A\limits^ \circ $$, then the atomic radius in fcc crystal is Which one of the following represents forward bias diode ? In the following circuit, the output Y for all possible inputs A and B is expressed by the truth table. ... In the energy band diagram of a material shown below, the open circles and filled circles denote holes and electrons respectively. The material is ... For a cubic crystal structure which one of the following relations indicating the cell characteristics is correct ? The following figure shows a logic gate circuit with two inputs A and B and the output C. The voltage waveforms of A, B and C are as shown below. ... A transistor is operated in common emitter configuration at constant collector voltage VC = 1.5 V such that a change in the base current from 100$$\m...
Which one of the following represents forward bias diode ?
Choose the only false statement from the following.
Application of a forward bias to a p-n junction
Zener diode is used for
Carbon, silicon and germanium atoms have four valence electrons each. Their valence and conduction bands are separated by energy band gaps represented...
Copper has face centered cubic (fcc) lattice with interatomic spacing equal to 2.54 $$\mathop A\limits^ \circ$$. The value of lattice constant for t...
In a p-n junction photo cell, the value of the photo-electromotive force profuced by monochromatic light is proportional to
The peak voltage in the output of a half wave diode rectifier fed with a sinusoidal signal without filter is 10 V. The d.c. component of the output vo...
In semiconductors at a room temperature
Of the diodes shown in the following diagrams, which one is reverse biased ?
The output of OR gate is 1
Reverse bias applied to a junction diode
A n-p-n transistor conducts when
If a full wave rectifier circuit is operating from 50 Hz mains, the fundamental frequency in the ripple will be
Barrier potential of a p-n junction diode does not depened on
Number of atom per unit cell in B.C.C.
For a transistor $${{{I_C}} \over {{I_E}}}$$ = 0.96, then current gain for common emitter is
In a p-n junction
The given truth table is for which logic gate               $$\matrix{ A &am... For the given circuit of p-n junction diode which is correct ... The given truth table is for which logic gate$$\matrix{ A &am...
For a common base circuit if $${{{I_C}} \over {{I_E}}}$$ = 0.98 then current gain for common emitter circuit will be
The current in the circuit will be ...
The cations and anions are arranged in alternate form in
From the following diode circuit, which diode is in forward biased condition
The correct relation for $$\alpha$$, $$\beta$$ for a transistor
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