Semiconductor Electronics: Materials, Devices and Simple Circuits Test 65

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Semiconductor Electronics: Materials, Devices and Simple Circuits Test 65

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Question 1
1 / -0

A zener diode is specified as having a breakdown voltage of $$9.1 V$$, with a maximum power dissipation of $$364 \ mW$$. What is the maximum current the diode can handle?

A
$$40 \ mA$$

B
$$60 \ mA$$

C
$$50 \ mA$$

D
$$45 \ mA$$

Solution
Question 2
1 / -0

The following configuration of gate is equivalent to:

A
$$NAND$$

B
$$XOR$$

C
$$OR$$

D
$$None\ of\ these$$

Solution

A B Y
1 1 0
1 0 1
0 1 1
0 0 0
Here gate gives $$1$$ only when there are odd $$1'$$ s Hence, it is $$XOR$$ gate equivalent option (B) is correct answer.
Question 3
1 / -0

If the lattice constant of this semiconductor is decreased, then which of the following is correct?

A
All $$E_c, E_g, E_v$$ increase

B
$$E_c$$ and $$E_v$$ increase but $$E_g$$ decreases

C
$$E_c$$ and $$E_v$$ decrease but $$E_g$$ incerases

D
All $$E_c, E_g, E_v$$ decrease

Solution
Question 4
1 / -0

Evaluate:

A
NAND

B
AND

C
NOR

D
OR

Solution
Question 5
1 / -0

If the revers bias voltage applied to a p-n junction diode is increased, its barrier capacitance would:

A
increase

B
decrease

C
remain constant

D
first increase then decrease

Solution
Question 6
1 / -0

The output of the gate is low when at least one of the its input is high. This is true for:-

A
NOR

B
OR

C
AND

D
NAND

Solution
Question 7
1 / -0

In a zener regulated power supply of a zener diode with $$V_z$$ = 6V is used for regulation. The load current is to be 4 mA and the unregulated input is 10 V. The value of series resistor $$R_s$$ is

A
less than $$ 5 \ \Omega$$

B
Infinite

C
greater than 100 $$\Omega$$

D
zero

Solution
Question 8
1 / -0

The length of germanium rod is $$0.928cm$$ and its area of cross-section is $$1\ mm^{2}$$. If for germanium $$n_1=2.5\times 10^{19}cm^{3}$$. $$\mu_{h}=0.19m^{2}V^{-1}s^{-1}$$. Its resistance is

A
$$2.5k\Omega$$

B
$$4.0k\Omega$$

C
$$5.0k\Omega$$

D
$$10.0k\Omega$$

Solution
Question 9
1 / -0

In the figure shown, the maximum and minimum currents through Zener diode are

A
5 mA, 1 mA

B
14 mA, 6 mA

C
14 mA, 5 mA

D
9 mA, 1 mA

Solution
Question 10
1 / -0

The current density (J) for an intrinsic semiconductor is given by which of the following equations?

A
$$j=n_1 . e . (\mu_e+\mu_h) . E$$

B
$$j=n_1 . e . (\mu_e-\mu_h) . E$$

C
$$j=\dfrac{n_1 . e . (\mu_e-\mu_h)} {E}$$

D
$$j=\dfrac{E}{n_1 . e . (\mu_e+\mu_h)} $$

Solution