HARD
JEE Main
IMPORTANT
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A signal of 5 kHz frequency is amplitude modulated on a carrier wave of frequency 2 MHz. The frequencies of the resultant signal is/are:

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Important Questions on Electronic Devices Semiconductors

MEDIUM
JEE Main
IMPORTANT

The value of the resistor, RS, needed in the DC voltage regulator circuit shown here, equals:

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EASY
JEE Main
IMPORTANT
A 2V battery is connected across AB as shown in the figure. The value of the current supplied by the battery when in first case battery's positive terminal is connected to A and in second case when positive terminal of battery is connected to B will respectively be:
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EASY
JEE Main
IMPORTANT

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Given, A and B are input terminals

Logic 1 is>5 V

Logic 0 is<1 V

Which logic gate operation, the following circuit does?

Note: This question was awarded a bonus. C option changed. 

EASY
JEE Main
IMPORTANT
Long-range radio transmission is possible when the radio waves are reflected from the ionosphere. For this to happen the frequency of the radio waves must be in the range:
MEDIUM
JEE Main
IMPORTANT

An n-p-n transistor has three leads A, B and C. Connecting B and C by moist fingers, A to the positive lead of an ammeter, and C to the negative lead of the ammeter, one finds large deflection. Then, A, B and C refer respectively to :

MEDIUM
JEE Main
IMPORTANT

A transmitting antenna at the top of a tower has a height 32 m and the height of the receiving antenna is 50 m. What is the maximum distance between them for satisfactory communication in line of sight (LOS) mode?

EASY
JEE Main
IMPORTANT

Identify the gate and match A,B,Y in the bracket to check.

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