If the lattice parameter for a crystalline structure is 3.6 0A, then the atomic radius in fcc crystal is
1. 1.810A
2. 2.100A
3. 2.920A
4. 1.270A
The voltage gain of an amplifier with 9% negative feedback is 10. The voltage gain without feedback will be
1. 90
2. 10
3. 1.25
4. 100
A p-n photodiode is made of a material with a band gap of 2.0 eV. The minimum frequency of the radiation that can be absorbed by the material is nearly
1. 10×1014 Hz
2. 5×1014 Hz
3. 1×1014 Hz
4. 20×1014 Hz
The circuit is equivalent to
1. AND gate 2. NAND gate
3. NOR gate 4. OR gate
In the forward bias arrangement of a PN-junction diode
(1) The N-end is connected to the positive terminal of the battery
(2) The P-end is connected to the positive terminal of the battery
(3) The direction of current is from N-end to P-end in the diode
(4) The P-end is connected to the negative terminal of battery
1. | the current in the reverse biased condition is generally very small. |
2. | the current in the reverse biased condition is small but the forward-biased current is independent of the bias voltage. |
3. | the reverse-biased current is strongly dependent on the applied bias voltage. |
4. | the forward-biased current is very small in comparison to reverse-biased current. |
The cut-in voltage for silicon diode is approximately
(1) 0.2 V
(2) 0.6 V
(3) 1.1 V
(4) 1.4 V
The electrical circuit used to get smooth output from a rectifier circuit is called:
1. oscillator.
2. filter.
3. amplifier.
4. logic gates.
PN-junction diode works as a insulator, if connected
(1) To A.C.
(2) In forward bias
(3) In reverse bias
(4) None of these
The reverse biasing in a PN junction diode
1. Decreases the potential barrier
2. Increases the potential barrier
3. Increases the number of minority charge carriers
4. Increases the number of majority charge carriers