Semiconductor Electronics: Materials, Devices and Simple Circuits Test 66

Result

Semiconductor Electronics: Materials, Devices and Simple Circuits Test 66

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Question 1
1 / -0

For inputs (A, B) and output (Y) of the following gate can be expressed as

A
$$A\oplus B$$

B
A.B

C
A+ B

D
$$\ \overset { - }{ A }B +\overset { - }{ B }A $$

Solution
Question 2
1 / -0

The following data are for intrinsic germanium at 300 K. $$n_1 = 2.4 \times 10^{19} \ /m^3, \ \mu_e = 0.39m^2 \ / Vs, \ \mu_n = 0.19 m^2 \ /Vs$$. Calculate the conductivity of intrinsic germanium.

A
$$4.3 Sm^{-1}$$

B
$$1.21 Sm^{-1}$$

C
$$2.22 Sm^{-1}$$

D
$$4.22 Sm^{-1}$$

Solution
Question 3
1 / -0

The majority current in a $$p-n$$ junction is $$:-$$

A
from the $$n-$$ side to the $$p-$$ side

B
from the $$p-$$ side to the $$n-$$ side

C
from the $$n-$$ side to the $$p-$$ side if the junction is forward$$-$$biased and in the opposite direction if it is reverse biased

D
from the $$p-$$ side to the $$n-$$ side if the junction is forward$$-$$biased and in the opposite direction if it is reverse biased

Solution
Question 4
1 / -0

The diode used in the circuit shown in the figure has a constant voltage drog currents and a maximum power rating of 100 mW. What should be the value r, connected in series with the diode, for obtaining maximum current l?

A
200 $$\Omega $$

B
6.67 $$\Omega $$

C
5 $$\Omega $$

D
1.5 $$\Omega $$

Solution
Question 5
1 / -0

Silicon is a semiconductor. On adding a small quantity of arsenic to it its conductivity

A
inceases

B
decreases

C
remaions the same

D
becomes zero

Solution
Question 6
1 / -0

The output in the figure is:-

A
$$\overline {AB} $$

B
$$\overline {\overline A .\overline B } $$

C
$$\overline {\overline {A.B} } $$

D
$${\overline A .\overline B }$$

Solution
Question 7
1 / -0

Two wires A and B of same material and same mass have radius $$2$$r and r. If resistance of wire A is $$34\Omega$$, then resistance of B will be?

A
$$544\Omega$$

B
$$272\Omega$$

C
$$68\Omega$$

D
$$17\Omega$$

Solution

The radius has a ratio of $$2:1$$, therefore the cross-sectional area is of ratio $$4:1.$$

The resistance per unit length is therefore $$ 1:4.$$

Because we are told the mass is the same, wire $$B$$, the smaller section wire will have to be $$4$$ times as long to have the same mass, neglecting the effects of any insulation on the mass.

So the final resistance of $$ B$$ will be $$16$$ times the resistance of $$A$$ or $$544$$ Ohms.
Question 8
1 / -0

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

A
20 mA

B
5 mA

C
10 mA

D
15 mA

Solution
Question 9
1 / -0

Figure shown the pacticle realisation of a logic gate, Identify the logic gate

A
$$NAND$$

B
$$NOR$$

C
$$XOR$$

D
$$XNOR$$

Solution
Question 10
1 / -0

What is the value of output voltage $$v _ { 0 }$$ in the circuit shown in the figure

A
6V

B
15V

C
20V

D
26V

Solution