JEE Main Semiconductor PYQ

1. (JEE Main 2021 (Online) 31st August Evening Shift)

Statement - I :

To get a steady dc output from the pulsating voltage received from a full wave rectifier we can connect a capacitor across the output parallel to the load R_L.

Statement - II :

To get a steady dc output from the pulsating voltage received from a full wave rectifier we can connect an inductor in series with R_L.

In the light of the above statements, choose the most appropriate answer from the options given below :

A. Statement I is true but Statement II is false

B. Statement I is false but Statement II is true

C. Both Statement I and Statement II are false

D. Both Statement I and Statement II are true

The Correct Answer is Option (D)

To convert pulsating dc into steady dc both of mentioned method are correct.

2. ( AIEEE 2009)

A $p$ - $n$ junction $(D)$ shown in the figure can act as a rectifier. An alternating current source $(V)$ is connected in the circuit. AIEEE 2009 Physics - Semiconductor Question 155 English

The current $(I)$ in the resistor $(R)$ can be shown by :

A. AIEEE 2009 Physics - Semiconductor Question 155 English Option 1

B. AIEEE 2009 Physics - Semiconductor Question 155 English Option 2

C. AIEEE 2009 Physics - Semiconductor Question 155 English Option 3

D. AIEEE 2009 Physics - Semiconductor Question 155 English Option 4

The Correct Answer is Option (B)

We know that a single $p$ - $n$ junction diode connected to an $a$ - $c$ source acts as a half wave rectifier [ Forward biased in one half cycle and reverse biased in the other half cycle ]

3. (AIEEE 2005)

In a full wave rectifier circuit operating from $50$ $H z$ mains frequency, the fundamental frequency in the ripple would be

A. $25$ $H z$

B. $50$ $H z$

C. $70.7$ $H z$

D. $100$ $H z$

The Correct Answer is Option (D)

$f = 50 H z \Rightarrow T = \frac{1}{50}$

For full wave rectifier, $T_{1} = \frac{T}{2} = \frac{1}{100} \Rightarrow f_{1} = 100 H z .$

Semiconductor Electronics