Electronic Devices

The reading of the ammeter for a silicon diode in the given circuit

The reading of the ammeter for a silicon diode in the given circuit is:

15 mA
11.5 mA
13.5 mA
0

In a common emitter amplifier circuit using an n-p-n transistor

In a common emitter amplifier circuit using an n-p-n transistor, the phase difference between the input and the output voltages will be:

180°
45°
90°
135°

The combination of gates shown below yields

NAND gate
NOT gate
XOR gate
OR gate

A strip of copper and another germanium are cooled

A strip of copper and another germanium are cooled from room temperature to 80 K. The resistance of

each of these decreases
each of these increases
copper strip increases and that of germanium decreases
copper strip decreases and that of germanium increases

In a transformer, number of turns in the primary coil are 140 and that in the secondary coil are 280

In a transformer, number of turns in the primary coil are 140 and that in the secondary coil are 280. If current in primary coil is 4 A, then that in the secondary coil is

10 A
6 A
4 A
2 A

A diode detector is used to detect an amplitude modulated wave of 60% modulation

A diode detector is used to detect an amplitude modulated wave of 60% modulation by using a condenser of capacity 250 pico farad in parallel with a load resistance 100 kilo ohm. Find the maximum modulated frequency which could be detected by it.

10.62 KHz
5.31 MHz
5.31 KHz
10.62 MHz