AND gate is only active when both the inputs are high same as series switching circuit which is active only when both switches are closed.

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Semiconductor Electronics Materials Devices And Simple Circuits

Q: Consider the following statements A and B and identify the correct answer.Statement(A):A Zener diode is always connected in reverse bias to use it as voltage.Statement(B):The potential barrier of a p-n junction lies between \$0.1\$ to \$0.3\ V\$, approximately.

When Zener diode is forward biased, it behaves like ordinary diode and when reverse biased, it will be a voltage stabilizer. Also, at room temperature, the voltage across the depletion layer for silicon is about \$0.6-0.7V\$ and for germanium is about \$0.3-0.35 V\$ Hence, statement A is correct but statement B is wrong.

Q: There is a sudden increase in current in zener diode is

When Zener diode is connected in reverse bias, as applied voltage reaches at Zener breakdown voltage, due to rupture of bonds there is a sudden increase in current in Zener diode.

Q: A p-n junction diode cannot be used

To increase the amplitude of an AC signal, transistors are used. p-n junction diodes can be used as rectifiers and in photo-diode and LED.

Q: A Zener diode when used as a voltage regulator, is connected (a) in forward bias. (b) in reverse bias.(c) in parallel to the load.(d) in series to the load.

When Zener diode is biased in the forward direction it behaves like a normal signal diode passing the current increasing linearly with voltage, but as soon as a reverse voltage applied across the Zener diode attains the breakdown voltage of the device, a large current starts to flow through the diode. Thus, for a constant voltage large current will flow through it. Hence, it always connected in parallel to the load.

Q: In an insulator, the energy gap between conduction band and valence band is about

Atoms are neutral in the insulator, thus there are no valence electrons in the outer orbit. The electrons are tightly bound with the nucleus hence, at room temperature thermal energy is not enough to push the electrons into conduction band and hence, no electrons are available for conduction. The energy required for electron to escape out from orbit and to over come the energy gap is thus of the order of \$6\ eV\$.

Q: Consider the following statements A and B and identify the correct answer:A) germanium is preferred over silicon in the construction of Zener diode.B) germanium has high thermal stability than silicon in the construction of Zener diode.

Germanium diode does not have a sharp breakdown in reverse bias and hence, the voltage does not remain constant at \$5\ V\$ after breakdown while silicon diode is better in this respect. Hence, silicon is preferred in Zener diode. Also, thermal stability of silicon is better than germanium.

Q: The following is NOT equal to \$0\$ in the Boolean algebra is

(A) For \$A = 0\$,\$\overline{\bar A.A} = \overline{\bar 0.0} = \overline{1.0} = \bar 0 = 1\$ For \$A = 1\$,\$\overline {\bar A.A} = \overline {\bar 1.1} = \overline {0.1} = \bar 0 = 1\$ (B) For \$A = 0\$,\$A.\bar A = 0. \bar 0 = 0.1 = 0\$For \$A = 1\$,\$A.\bar A = 1. \bar 1 = 1.0 = 0\$(C) For \$A = 0\$,\$A.0 = 0.0 = 0\$For \$A = 1\$,\$A.0 = 1.0 = 0\$(D) For \$A = 0\$,\$\overline{A+\bar A} = \overline{0+\bar 0} = \overline{0+1} = \bar 1 = 0\$For \$A = 1\$,\$\overline{A+\bar A} = \overline{1+\bar 1} = \overline{1+0} = \bar 1 = 0\$

Q: Digital circuit can be made by repetitive use of :

NAND gate is called universal gate because all other logic gates such as AND, OR and NOT can be constructed from various combinations of NAND gates. Thus, any digital circuit can be made by appropriate repetitive use of NAND gate.

Q: NAND and NOR gates are called universal gates because they

it is a mixture of series and parallel switching circuit.

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In an insulator, the energy gap between conduction band and valence band is about

0 e V

6 e V

1 e V

0.6 e V

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Consider the following statements A and B and identify the correct answer:
A) germanium is preferred over silicon in the construction of Zener diode.
B) germanium has high thermal stability than silicon in the construction of Zener diode.

Both (A) and (B) are true.

Both (A) and (B) are false.

(A) is true but (B) is false.

(A) is false but (B) is true.

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The following is NOT equal to $0$ in the Boolean algebra is

\overline{\overline{A} . 0}

A . \overset{ˉ}{A}

A . 0

\overline{A + \overline{A}}

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Digital circuit can be made by repetitive use of :

OR gates

AND gates

NOT gates

NAND gates

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NAND and NOR gates are called universal gates because they

are universally available.

can be combined to produce OR, AND and NOT gates.

are widely used in the integrated circuits.

can be easily manufactured.

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Semiconductor Electronics Materials Devices And Simple Circuits

Physics 4236 Views

Consider the following statements A and B and identify the correct answer. Statement(A):A Zener diode is always connected in reverse bias to use it as voltage. Statement(B):The potential barrier of a p-n junction lies between 0.1 to 0.3 V, approximately.

There is a sudden increase in current in zener diode is

A p-n junction diode cannot be used

A Zener diode when used as a voltage regulator, is connected (a) in forward bias. (b) in reverse bias. (c) in parallel to the load. (d) in series to the load.

AND gate

In an insulator, the energy gap between conduction band and valence band is about

Consider the following statements A and B and identify the correct answer: A) germanium is preferred over silicon in the construction of Zener diode. B) germanium has high thermal stability than silicon in the construction of Zener diode.

The following is NOT equal to 0 in the Boolean algebra is

Digital circuit can be made by repetitive use of :

NAND and NOR gates are called universal gates because they

Physics
4236 Views

Consider the following statements A and B and identify the correct answer.
Statement(A):A Zener diode is always connected in reverse bias to use it as voltage.
Statement(B):The potential barrier of a p-n junction lies between $0.1$ to $0.3 V$ , approximately.

A Zener diode when used as a voltage regulator, is connected
(a) in forward bias.
(b) in reverse bias.
(c) in parallel to the load.
(d) in series to the load.

Consider the following statements A and B and identify the correct answer:
A) germanium is preferred over silicon in the construction of Zener diode.
B) germanium has high thermal stability than silicon in the construction of Zener diode.

The following is NOT equal to $0$ in the Boolean algebra is