Forward Bias

Q.

Why is the Zener diode used in reverse bias?

Q.

PN-junction diode works as an insulator when connected in?

1. To A.C

2. In forward bias

3. In reverse bias

4. None of these

Q. Which one of the following represents forward bias diode?

1. 
2. 
3. 
4. 

Q.

A 2V battery is connected across the points A and B as shown in the figure given below. Assuming that the resistance of each diode is zero in forward bias and infinity in reverse bias, the current supplied by the battery when its positive terminal is connected to A is

1. 0.2A

2. 0.4A

3. Zero

4. 0.1A

Q.

When a zener diode is operated in forward biased then

Q.

Two PN-junctions can be connected in series by three different methods as shown in the figure. If the potential difference in the junctions is the same, then the correct connections will be [IIT-JEE 1989]

1. In the circuit (1) and (2)

2. In the circuit (2) and (3)

3. In the circuit (1) and (3)

4. Only in the circuit (1)

Q.

When forward bias is applied to a p-n junction, then what happens to the potential barrier $V_B$, and the width of charge depletion region?

1. $V_B$ increases, x decreases

2. $V_B$ decreases, x increases

3. $V_B$ increases, x increases

4. $V_B$ decreases, x decreases

Q.

The diode used in the circuit shown in the figure has a constant voltage drop of 0.5 V at all currents and a maximum power rating of 100 milliwatts. What should be the value of the resistor R, connected in series with the diode for obtaining maximum current

1. 1.5 ohm

2. 5 ohm

3. 6.67 ohm

4. 200 ohm

Q.

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

Q. A diode is said to be forward biased if

1. p-side is at a higher potential with respect to n-side
2. n-side is at a higher potential with respect to p-side
3. p-side is at the same potential as n-side
4. None of these

Q.

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

Q.

In the circuit given below, the value of the current is

1. 0 amp

2. 

3. 

4. 

Q. Which one of the following represents forward bias diode?

1. 
2. 
3. 
4. 

Q. The forward biased diode connection is:

1. 
2. 
3. 
4. 

Q. A Zener diode

1. is a heavily doped in reverse bias junction diode.
2. is a lightly doped in forward bias junction diode.
3. is a lightly doped in reverse bias junction diode.
4. is a heavily doped in forward bias junction diode.