Electronic Devices (NEET Physics): Questions 15 - 19 of 65

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Passage

A student performs an experiment for drawing the static characteristic curve of a triode valve in the laboratory. The following data were obtained from the linear portion of the curves:

Data obtained from the linear portion of curve

List of data obtaining from liner portion of curve of static characteristic curve of a triode

Grid voltage V g (Volt)

-2.0

-3.5

-2.0

Plate voltage V p (Volt)

180

180

120

Plate current I P (mA)

15

7

10

Question number: 15 (2 of 3 Based on Passage) Show Passage

» Electronic Devices » Semiconductor Diode

MCQ▾

Question

Calculate the mutual conductance (g m) of the triode valve?

Choices

Choice (4) Response
a.

5.00 × 10 -3 ohm -1

b.

5.33 × 10 -3 ohm -1

c.

4.32 × 10 -3 ohm -1

d.

53.3 × 10 -3 ohm -1

Question number: 16 (3 of 3 Based on Passage) Show Passage

» Electronic Devices » Semiconductor Diode

MCQ▾

Question

Calculate the amplification factor μ of the triode valve?

Choices

Choice (4) Response
a.

62

b.

54

c.

52

d.

64

Question number: 17

» Electronic Devices » Semiconductor Diode

MCQ▾

Question

Two PN-j unctions can be connected in series by three different methods as shown in the figure. If the potential difference in the junctions is the same, then the correct connections will be

Two PN junctions connected in series.

Two PN Junctions Connected in Series.

In figure two PN junctions are connected in series by three different methods.

Choices

Choice (4) Response
a.

In the circuit (1) and (2)

b.

In the circuit (2) and (3)

c.

In the circuit (1) and (3)

d.

Only in the circuit (1)

Question number: 18

» Electronic Devices » Semiconductors

Assertion-Reason▾

Assertion (Ꭺ)

Ohm’s law is obeyed by semiconductors only in low electric fields.

Reason (Ꭱ)

Ohm’s law is not same for weak field and strong electric fields.

Choices

Choice (4) Response
a. Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ
b. Ꭺ is true but Ꭱ is false
c. Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ
d. Both Ꭺ and Ꭱ are false

Question number: 19

» Electronic Devices » Semiconductors

MCQ▾

Question

Choose the correct statement

Choices

Choice (4) Response
a.

When we heat a semiconductor its resistance decreases

b.

When we heat a semiconductor its resistance increases

c.

Resistance of a semiconductor is independent of temperature

d.

When we cool a semiconductor to 0 K then it becomes superconductor

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