Semiconductor Electronics

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

The barrier potential of a p-n junction depends on
(1)   type of semiconductor material
(2)   amount of doping
(3)   temperature
Which one of the following is correct ?

The given graph represents V-I characteristic for a semiconductor device.

Which of the following statement is correct ?

The output from a NAND gate is divided into two in parallel and fed to another NAND gate. The resulting gate is a

One way in which the operation of a n-p-n transistor differs from that of a p-n-p

In an unbiased p-n junction, holes diffuse from the p-region to n-region because of

In a n-type semiconductor, which of the following statement is true.

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 transistor is replaced with another one with transconductance 0.02 mho and current gain 20, the ...

The output (X) of the logic circuit shown ion figure will be

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\(\Omega\) and the current amplification of the transistor is 100, the input signal voltage is

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 gate 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 using transistor as a switch, it is used

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 because

Two ideal diodes are connected to a battery as shown in the circuit. The current supplied by the battery is

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 current by 2 mA. This transistor is used as a common emitter amplifier with a load resistance of...

To get an output Y= 1 in given circuit which of the following input will be correct ?

If a small amount of antimony is added to germanium crystal

In forward biasing of the p-n junction

Symbolic representation of four logic gates are shown as

Pick out which ones are for AND, NAND and NOT gates, respectively

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 produces a change in the collector current from 10 mA to 20 mA. The current gain 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 \(\times\) 1022 m\(-\)3. The doped semiconductor is of

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

Which one of the following bonds produces a solid that reflects light in the visible region and whose electrical conductivity decreases with temperature and has high melting point ?

The device that can act as a complete electronic circuit is

Which one of the following statement is false ?

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 of the amplifier is

To get an output Y = 1 in given circuit which of the following input will be correct ?

For transistor action
(1)  Base, emitter and collector regions should have similar size and doping concentrations.
(2)  The base region must be vety thin and lightly doped.
(3)  The emitter-base junction is forward biased and base-collecto...

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 logic gate is

A p-n photodiode is fabricated from a semiconductor with a band gap of 2.5 eV. It can detect a signal of wavelength

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 produces a change in the collector current from 5 mA to 10 mA. The current gain is

The symbolic representation of four logic gates are given below

The logic symbols for OR, NOT and NAND gates are respectively

Sodium has body centred packing. Distance between two nearest atoms is 3.7 \(\mathop A\limits^ \circ\). The lattice parameter is

If the lattice parameter for a crystalline structure is 3.6 \(\mathop A\limits^ \circ\), then the atomic radius in fcc crystal 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 nearly

The voltage gain of an amplifier with 9% negative feedback is 10. The voltage gain without feedback will be

For a cubic crystal structure which one of the following relations indicating the cell characteristics is correct ?

In the following circuit, the output Y for all possible inputs A and B is expressed by the truth table.

Which one of the following represents forward bias diode ?

In the energy band diagram of a material shown below, the open circles and filled circles denote holes and electrons respectively. The material is

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.

The logic circuit gate is

Which one of the following represents forward bias diode ?

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 \(\mu\)A to 150 \(\mu\)A profuces a change in the collector current from 5 mA to 10 mA. The ...

Choose the only false statement from the following.

Copper has face centered cubic (fcc) lattice with interatomic spacing equal to 2.54 \(\mathop A\limits^ \circ\). The value of lattice constant for this lattice is

In a p-n junction photo cell, the value of the photo-electromotive force profuced by monochromatic light is proportional to

Application of a forward bias to a p-n junction

Carbon, silicon and germanium atoms have four valence electrons each. Their valence and conduction bands are separated by energy band gaps represented by (Eg)C, (Eg)si and (Eg)Ge respectively. Which one of the following relationships is tr...

Zener diode is used for