1
MCQ (Single Correct Answer)

JEE Main 2019 (Online) 11th January Morning Slot

In the given circuit the current through Zener Diode is close to:

A
0.0 mA
B
6.7 mA
C
4.0 mA
D
6.0 mA

Explanation

Since voltage across zener diode must be less than 10V therefore it will not work in breakdown region, & its resistance will be infinite & current through it = 0
2
MCQ (Single Correct Answer)

JEE Main 2019 (Online) 11th January Evening Slot

The circuit shown below contains two ideal diodes, each with a forward resistance of 50 $$\Omega $$. If the battery voltage is 6 V, the current through the 100 $$\Omega $$ resistance (in Amperes) is :

A
0.027
B
0.030
C
0.036
D
0.020

Explanation

I = $${6 \over {300}}$$ = 0.02 (D2 is in reverse bias)
3
MCQ (Single Correct Answer)

JEE Main 2019 (Online) 12th January Morning Slot

The output of the given logic circuit is :

A
$$\overline A B$$
B
$$AB + \overline {AB} $$
C
$$A\overline B + \overline A B$$
D
$$A\overline B $$

Explanation


Y $$ = \overline {\left( {\overline A + \overline B } \right)\overline A } $$

$$ = \overline {\overline A + \overline A B} $$

$$ = A\left( {\overline {\overline A B} } \right)$$

$$ = A\left( {A + \overline B } \right)$$

$$ = A + A\overline B = A\overline B $$
4
MCQ (Single Correct Answer)

JEE Main 2019 (Online) 12th January Evening Slot

In the figure, given that VBB supply can vary from 0 to 5.0 V, VCC = 5V, $$\beta $$dc = 200, RB = 100 k$$\Omega $$, RC = 1 k$$\Omega $$ and VBE = 1.0 V. The minimum base current and the input voltage at which the transistor will go to saturation, will be respectively :

A
20 $$\mu $$A and 2.8 V
B
25 $$\mu $$A and 2.8 V
C
20 $$\mu $$A and 3.5 V
D
25 $$\mu $$A and 3.5 V

Explanation

At saturation, VCE = 0

VCE = VCC $$-$$ ICRC

$$ \Rightarrow $$  IC = $${{{V_{CC}}} \over {{R_C}}} = 5 \times {10^{ - 3}}\,A$$

Given

$$\beta $$dc = $${{{{\rm I}_C}} \over {{{\rm I}_B}}}$$

IB = $${{5 \times {{10}^{ - 3}}} \over {200}}$$

IB = 25$$\mu $$A

At input side

VBB = IBRB + VBE

= (25mA) (100k$$\Omega $$) + 1V

VBB = 3.5 V

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