1
JEE Main 2022 (Online) 27th June Morning Shift
+4
-1

Identify the correct Logic Gate for the following output (Y) of two inputs A and B.

A
B
C
D
2
JEE Main 2022 (Online) 26th June Evening Shift
+4
-1

The positive feedback is required by an amplifier to act an oscillator. The feedback here means :

A
External input is necessary to sustain ac signal in output.
B
A portion of the output power is returned back to the input.
C
Feedback can be achieved by LR network.
D
The base-collector junction must be forward biased.
3
JEE Main 2022 (Online) 26th June Morning Shift
+4
-1

The I-V characteristics of a p-n junction diode in forward bias is shown in the figure. The ratio of dynamic resistance, corresponding to forward bias voltage of 2 V and 4 V respectively, is :

A
1 : 2
B
5 : 1
C
1 : 40
D
20 : 1
4
JEE Main 2022 (Online) 25th June Evening Shift
+4
-1

Identify the logic operation performed by the given circuit:

A
AND gate
B
OR gate
C
NOR gate
D
NAND gate
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