In the figure given below, assuming the diodes to be ideal,
1. | D1 is forward biased and D2 is revers-biased and hence current flows from A to B. |
2. | D2 is forward biased and D1 is reverse-biased and hence no current flows from B to A and vice-versa. |
3. | D1 and D2 are both forward-biased and hence current flows from A to B. |
4. | D1 and D2 are both reverse-biased and hence no current flows from A to B and vice-versa. |
A 220 V AC supply is connected between points A and B (figure). What will be the potential difference V across the capacitor?
1.
2.
3.
4.
Hole is:
1. | an anti-particle of electron. |
2. | a vacancy created when an electron leaves a covalent bond. |
3. | absence of free electrons. |
4. | an artificially created particle. |
The output of the given circuit in figure given below,
1. | would be zero at all times |
2. | would be like a half wave rectifier with positive cycles in output |
3. | would be like a half wave rectifier with negative cycles in output |
4. | would be like that of a full wave rectifier |
In the circuit shown in the figure given below, if the diode forward voltage drop is 0.3 V, the voltage difference between A and B is:
1. 1.3 V
2. 2.3 V
3. 0
4. 0.5 V
When an electric field is applied across a semiconductor
a. | electrons move from lower energy level to higher energy level in the conduction band |
b. | electrons move from higher energy level to lower energy level in the conduction band |
c. | holes in the valence band move from higher energy level to lower energy level |
d. | holes in the valence band move from lower energy level to higher energy level |
1. (a, c)
2. (a, d)
3. (b, d)
4. (c, d)
In the depletion region of a diode:
a. | there are no mobile charges |
b. | equal number of holes and electrons exist, making the region neutral |
c. | recombination of holes and electrons has taken place |
d. | immobile charged ions exist |
1. (a, b)
2. (a, b, d)
3. (c, d)
4. All options are correct
What happens during the regulation action of a Zener diode?
1. | the current and voltage across the Zener remain fixed. |
2. | the current through the series Resistance (Rs) changes. |
3. | the Zener resistance is constant. |
4. | the resistance offered by the Zener changes. |
Choose the correct option:
1. | (a, b) |
2. | (b, d) |
3. | (b, c) |
4. | (c, d) |
To reduce the ripples in rectifier circuit with capacitor filter:
(a) RL should be increased
(b) input frequency should be decreased
(c) input frequency should be increased
(d) capacitors with high capacitance should be used
1. (a, c)
2. (b, d)
3. (a, c, d)
4. (b, c, d)