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Introduction to Diodes

Comprehensive introduction to diode characteristics, applications, and types including semiconductor and vacuum diodes

16 Questions Published
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Questions

Question 1 Multiple Choice (Single Answer)

For detecting intensity of light we use

  1. Photodiode in forward bias
  2. Photodiode in reverse bias
  3. LED in forward bias
  4. LED in reverse bias
Question 2 Multiple Choice (Single Answer)

In the forward bias characteristic curve, a diode appears as :

  1. an OFF switch
  2. a high resistance
  3. an ON switch
  4. a capacitor
Question 3 Multiple Choice (Single Answer)

A p-n junction diode cannot be used

  1. as a rectifier.
  2. for converting light energy to electric energy.
  3. for getting light radiation.
  4. for increasing the amplitude of an AC signal.
Question 4 Multiple Choice (Single Answer)

If ‘p’ region of a semi conductor is connected to negative and ‘n’ region to positive pole, it is said to be

  1. directed biased
  2. unbiased
  3. forward biased
  4. reverse biased
Question 5 Multiple Choice (Single Answer)

For germanium diode, the junction voltage is about _____.

  1. $0.7V$
  2. $0.3V$
  3. $0.6V$
  4. $3V$
Question 6 Multiple Choice (Single Answer)

Diode can work as

  1. Modulator
  2. Demodulator
  3. Rectifier
  4. Amplifier
Question 7 Multiple Choice (Single Answer)

For detecting the light_______________.

  1. The photodiode has to be forward biased
  2. The photodiode has to be reversed biased
  3. The LED has to connected in forward bias mode
  4. The LED has to be connected in reverse bias mode
Question 8 Multiple Choice (Single Answer)

In a diode detector, output circuit consist of $R=1M\Omega \quad and\quad C=1pF$. Calculate the carrier frequency it can detect.

  1. 3000Hz
  2. 1000Hz
  3. 2000Hz
  4. 4000Hz
Question 9 Multiple Choice (Single Answer)

Select the correct statement from the following 

  1. a diode can be used as a rectifier
  2. a diode cannot be used as a rectifier
  3. the current in a diode is always proportional to the applied voltage
  4. None of these
Question 10 Multiple Choice (Single Answer)

A light emitting diode (LED) has a voltage drop of 2 V across it and passes a current of 10 mA. When it operates with a 6 V battery through a limiting resistor R, the value of R is 

  1. 200 $\Omega$
  2. 400 $\Omega$
  3. 40 $k\Omega$
  4. 4 $k\Omega$
Question 11 Multiple Choice (Single Answer)

When a diode is heavily doped the 

  1. Zener voltage will be low
  2. Avalanche voltage will be high
  3. Depletion region will be thin
  4. Leakage current will be low
Question 12 Multiple Choice (Single Answer)

The relation between dynamic plate resistance $\left( r _ { p } \right)$ of a vacuum diode and plate current in the space charge limited region, is 

  1. $r _ { p } \propto I _ { p }$
  2. $r _ { p } \propto I _ { p } ^ { 3 / 2 }$
  3. $r _ { p } \propto \frac { 1 } { I _ { p } }$
  4. $r _ { p } \propto \frac { 1 } { \left( I _ { p } \right) ^ { 1 / 3 } }$
Question 13 Multiple Choice (Single Answer)

Zener diode is used as

  1. Half wave rectifier
  2. Full wave rectifier
  3. ac voltage stabilizer
  4. dc voltage stabilizer
Question 14 Multiple Choice (Single Answer)

What is the work function of tungsten at $1500\ K$ temperature, when a diode valve with a tungsten filament works at $1500\ K$? Assume the work function of tungsten at $0\ K$ is $4.52\ eV$:

  1. $4.71\ eV$
  2. $0.39\ eV$
  3. $8.86\ eV$
  4. $1.25\ eV$
Question 15 Multiple Choice (Single Answer)

Diodes are used to ___________.

  1. convert DC into AC
  2. convert AC into DC
  3. resistance control
  4. current regulation
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