MHT CET
Physics
Semiconductor Devices and Logic Gates
Previous Years Questions

In the study of transistor as an amplifier if $$\alpha=\frac{I_C}{I_E}=0.98$$ and $$\beta=\frac{I_C}{I_B}=49$$, where $$I_C, I_B$$ and $$\mathrm{I}_{\... If$$p$$-$$n$$junction diode is in forward bias then In the digital circuit the inputs are as shown in figure. The Boolean expression for output$$\mathrm{Y}$$is ... Identify the correct circuit diagrams for the normal operation from the following. ... In energy band diagram of insulators, a band gap and the conduction band is respectively In the case of NAND gate, if A and B are the inputs and$$\mathrm{Y}$$is the output then A pure$$\mathrm{Si}$$crystal has$$4 \times 10^{28}$$atoms per$$\mathrm{m}^3$$. It is doped by 1 ppm concentration of antimony. The number of free... The output of an 'OR' gate is connected to both the inputs of a 'NAND' gate. The combination will serve as Which one of the operations of$$\mathrm{n}-\mathrm{p}-\mathrm{n}$$transistor differs from that of$$p-n-p$$transistor? For the diagram shown, the resistances between points A and B when ideal diode D is forward biased is '$$R_1$$' and that when reverse biased is '$$R_2...
To obtain the truth-table shown, from the following logic circuit, the gate G should be ...
In insulators
Identify the mismatch out of the following.
In the reverse biasing of a p-n junction diode :
In a transistor, in common emitter configuration, the ratio of power gain to voltage gain is
If the frequency of the input voltage is $$50 \mathrm{~Hz}$$, applied to a (a) half wave rectifier and (b) full wave rectifier. The output frequency i...
For an intrinsic semiconductor $$\left(\mathrm{n}_{\mathrm{h}}\right.$$ and $$\mathrm{n}_{\mathrm{e}}$$ are the number of holes per unit volume and nu...
A $$5.0 \mathrm{~V}$$ stabilized power supply is required to be designed using a $$12 \mathrm{~V}$$ DC power supply as input source. The maximum power...
To get the truth table shown, from the following logic circuit, the Gate G should be ...
Combination of NAND gates is shown in the figure. It is equivalent to ...
In an ideal junction diode, the current flowing through PQ is ...
LED is manufactured using zinc selenide then it emits.
In a pure silicon, number of electrons and holes per unit volume are $$1.6 \times 10^{16} \mathrm{~m}^{-3}$$. If silicon is doped with Boron in a way ...
For a transitor, $$\frac{1}{\alpha_{\mathrm{DC}}}-\frac{1}{\beta_{\mathrm{DC}}}$$ is equal to [ $$\alpha_{\mathrm{DC}}$$ and $$\beta_{\mathrm{DC}}$$ a...
The current in the following circuit is ...
The output of an 'OR' gate is 'one'
In the case of insulators, a band gap and conduction band is respectively
A rectifier is used to
Two different logic gates moving output '0' for the inputs (0, 1) and then for (1, 0) are
The frequency of a given a.c. signal is 'N' Hz. When it is connected to a half wave rectifier, the number of output pulses given by the rectifier in 1...
Silicon and copper are cooled from 300 K to 100 K, the specific resistance (resistivity)
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