EASY

12th CBSE

IMPORTANT

Earn 100

The input resistance, in the common emitter amplifier circuit of a given transistor, has a value of $1.5 k Ω$ . The output of this circuit is obtained across a collector resistance of $7.5 k Ω$ . What would be the output voltage, corresponding to an input voltage of $5 m V$ , if the current amplification factor, of this transistor, has a value of $60$ ?

Important Questions on Semiconductor Devices and Digital Circuits

MEDIUM

12th CBSE

IMPORTANT

PHYSICS A Reference Book for Class 12 Volume 2>Chapter 6 - Semiconductor Devices and Digital Circuits>Problems For Practice>Q 12

The current gain of a transistor in common base arrangement is

0.95

. Find the voltage gain and power gain if load resistance of output circuit is

400 k Ω

and input resistance is

200 Ω

MEDIUM

12th CBSE

IMPORTANT

PHYSICS A Reference Book for Class 12 Volume 2>Chapter 6 - Semiconductor Devices and Digital Circuits>Problems For Practice>Q 13

In common emitter amplifier, current gain is

60 .

If the emitter current is

7.7 m A

, calculate the base current and collector current. Also calculate current gain, when the same transistor is working as common base amplifier.

MEDIUM

12th CBSE

IMPORTANT

PHYSICS A Reference Book for Class 12 Volume 2>Chapter 6 - Semiconductor Devices and Digital Circuits>Problems For Practice>Q 14

The power gain for

C B

amplifier is

800,

and the voltage amplification factor is

840 .

Find the collector current when the base current is

1.2 m A

EASY

12th CBSE

IMPORTANT

PHYSICS A Reference Book for Class 12 Volume 2>Chapter 6 - Semiconductor Devices and Digital Circuits>Problems For Practice>Q 15

The current gain of a transistor in CB configuration is

0.98 .

Find the change in collector current corresponding to a change of

5.0 m A

in the emitter current. What would be the change in base current?

EASY

12th CBSE

IMPORTANT

PHYSICS A Reference Book for Class 12 Volume 2>Chapter 6 - Semiconductor Devices and Digital Circuits>Problems For Practice>Q 16

In common‐emitter transistor amplifier, the load resistance of the output circuit is

1000

times the load resistance of the input circuit. If

α = 0.98

, then calculate the voltage gain.

MEDIUM

12th CBSE

IMPORTANT

PHYSICS A Reference Book for Class 12 Volume 2>Chapter 6 - Semiconductor Devices and Digital Circuits>Problems For Practice>Q 17

In common‐emitter transistor amplifier, an increase of

50 μ A

in the base current causes an increase of

1.0 m A

in the collector current. Calculate gain

β

. What will be the change in emitter current? Also calculate current gain

α .

MEDIUM

12th CBSE

IMPORTANT

PHYSICS A Reference Book for Class 12 Volume 2>Chapter 6 - Semiconductor Devices and Digital Circuits>Problems For Practice>Q 18

The base current of a transistor is

105 μ A

and collector current is

2.05 m A .

(i) Determine the value of

β,

I_{E}

and

α .

(i i)

A change of

27 μ A

in the base current produces a change of

0.6 m A

in the collector current. Find

β_{a c}

MEDIUM

12th CBSE

IMPORTANT

PHYSICS A Reference Book for Class 12 Volume 2>Chapter 6 - Semiconductor Devices and Digital Circuits>Problems For Practice>Q 19

A transistor is used in common emitter mode in an amplifier circuit. When a signal of

30 m V

is added to the base‐emitter voltage, the base current changes by

30 μ A

and collector current by

3 m A .

The load resistance is

5 k Ω

. Calculate (i) the current gain

β

(ii) the input resistance

R_{B E}

(iii) transconductance and (iv) voltage gain.

Important Questions on Semiconductor Devices and Digital Circuits

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