EASY
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With increasing biasing voltage of a photo diode, the photocurrent magnitude:

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Important Questions on Atomic Structure

MEDIUM
The given graph represents V - I characteristic for a semiconductor device.
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Which of the following statement is correct?
HARD
For the circuit shown below, the current through the Zener diode is

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MEDIUM
The figure represents a voltage regulator circuit using a Zener diode. The breakdown voltage of the Zener diode is 6 V and the load resistance is, RL=4 kΩ . The series resistance of the circuit is  Ri=1 kΩ . If the battery voltage VB varies from 8 V  to  16 V , what are the minimum and maximum values of the current through Zener diode?
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EASY

Two p - n photodiodes are fabricated from semiconductors with band gap of 2.8eV and 2.6eV, respectively.

Choose the correct statement from the following.

MEDIUM

The 6 V Zener diode shown in the figure has negligible resistance and a knee current of 5 mA. The minimum value of R in Ω so that the voltage across it does not fall below 6 V is
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EASY

Take the breakdown voltage of the zener diode used in the given circuit as 6 V. For the input voltage shown in the figure below, the time variation of the output voltage is: (Graphs drawn are schematic and not to the scale)

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MEDIUM
The reverse break down voltage of a Zener diode is 5.6 V in the given circuit.
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The current Iz through the Zener is:
EASY
Zener diode is used to regulate the voltage supply because, while using a zener diode
MEDIUM

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

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EASY
A Zener diode with a breakdown voltage of 4 V is connected in series with a resistance R to a battery of emf 10 V. The maximum power dissipation rating for the Zener diode is 1 W. The value of R to ensure maximum power dissipation across the diode is
MEDIUM

In the circuit shown, what will be the current through the 6 V zener?

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EASY
The I - V characteristics of an LED is:
MEDIUM

What will be the current flowing through the 6  resistor in the circuit shown, where the breakdown voltage of the Zener is 6 V?

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EASY

Two Zener diodes (A and B) having breakdown voltages of 6 V and  4 V respectively, are connected as shown in the circuit below. The output voltage V0 variation with input voltage linearly increasing with time, is given by (Vinput = 0 V at t = 0)

 

EASY

In case of a p-n junction diode at high value of reverse bias, the current rises sharply. The value of reverse bias is known as

EASY
LED is constructed from Ga-As-P semiconducting material. The energy gap of this LED is 1.9 eV. Calculate the wavelength of light emitted and its colour. h=6.63×10-34 J-s and c=3×108 m s-1
EASY
Zener breakdown occurs in a p-n junction having pand n both:
MEDIUM
Figure shows a DC voltage regulator circuit, with a Zener diode of breakdown voltage =6 V . If the unregulated input voltage varies between 10 V to 16 V, then what is the maximum Zener current?
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EASY
In the given circuit the current through zener diode is:
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