50top special purpose diode mcq Zener Schottky LEDforExams

50 top MCQ special purpose diode Zener Schottky LED for Exams

special purpose diode mcq

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Special purpose diodes MCQ quiz

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A varactor diode is optimised for

2 / 5

A zener diode is used as

3 / 5

The light emitting diode (LED)

4 / 5

The barrier potential of schottky diode is

5 / 5

What is true about the breakdown voltage in the zener diode

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MCQs on different types of semiconductor diodes for competitive exams. Special purpose diodes mcq

  • LED
  • Zener diode
  • Rectifier diode
  • Tunnel diode
  • Variable capacitance diode
  • Photodiode
  • back diode
special purpose diode mcq
LED special purpose diode mcq

Q1)A Zener diode has a

a) high forward voltage rating

b) negative resistance

c) high amplification

d) sharp breakdown voltage at lower reverse voltage

Q2) A Zener diode is used as

a) an amplifier

b) a voltage regulator

c) a coupler

d) a rectifier

Q3) A Zener diode is operated in

a) breakdown region

b) forward characteristic region

c) both a and b

d) none of these

Q4) The output voltage of a Zener diode rated as 12 volt +/- 10% tolerance is

a) 12.2 to 11.8 volt

b) 13.2 to 10.8 volt

c) only 12 volt

d) none of these

Hint:(12+1.2=13.2 and 12-1.2=10.8)

Q5) A varactor diode is optimised for

a) high output voltage

b) high output current

c) its variable capacitance

d) its variable inductance

Q6) When the reverse bias potential is increased across a varactor diode

a) width of depletion layer increases which increases the capacitance

b) width of depletion layer increases which decreases the capacitance

c) width of depletion layer decreases which increases the capacitance

d) width of depletion layer decreases which decreases the capacitance

Q7) The light emitting diode (LED)

a) it usually made from metal oxide

b) used in reverse biased junction

c) gives a light output which increases with temperature

d) emits light due to recombination of holes and electrons

Q8) The material used for the construction of LED is

a) silicon

b) germanium

c) gallium arsenide phosphide

d) none of these

Q9) The barrier potential of Schottky diode is

a) 0.25 volt

b) 0.7 volt

c) 0.3 volt

d) 1.7 volt

Q10) A diode which has zero breakdown voltage is known as

a) zener diode

b) backward diode

c) schottky diode

d) tunnel diode

Q11) A zener diode is always operated in the (………………………………….)region.

answer is breakdown region

Q12) Usually a Zener diode is used as a (…………………………….).

answer is voltage regulator

Q13) When a PN junction is heavily doped its breakdown voltage will (…………………………………).

answer is decreases

Q14) A manufacturers specifies that for a particular Zener the output voltages 10 volt with 10% tolerance, Zener voltage for that diode lies between (………….) and (……………) volt.

answer is 9 volt and 11 volt

Q15) Current in a 1.2 watt 6 volt Zener diode should be limited to a maximum of (…………….) ampere.

answer is 0.2 ampere (Special purpose diodes mcq)

Q16) The silicon diodes which are optimised for their variable capacitance are known as (………………………….) diodes.

answer is varactor diodes

Q17) In a forward bias, LED light is radiated when free electrons and holes (………………………) at the junction.

answer is recombine

Q18) The most common LED array is the (…………………….) indicator.

Answer is seven segment indicator.

Q19) LEDs typically have a voltage drop of (………………………..) volt to (……………………..)volt.

answer is 1.5 and 2.5 volt

Q20) A photodiode is optimised for its sensitivity to (……………….)

answer is light

Q21) Schottky diodes are made of n type semiconductor and (……………………….)

answer is metal

Q22) The barrier potential of a Schottky diode is (………………………..) volt.

answer is 0.25 volt

Q23) For the rectification of very high frequency hundred megahertz signals (…………………………….) diode is used.

answer is schottky diode

Q24) For the rectification of very small peak voltage 0.5 volt only signal (………………..) diode is best suited.

answer is backward diode.

Q25) (……………….) diode has a negative resistance.

answer is tunnel diode

Q26) A specially designed silicon diode which is optimised to operate in the breakdown region is known as (…………………….).

answer is zener diode

Q27) The (…………………….) breakdown and (……………………..) breakdown are two different mechanism of which a PN junction breaks.

answer is avalanche and zener breakdown

Q28) (……………) occurs in thicker junctions (ordinary diodes) ,after this breakdown the junction is destroyed forever and the diode is said to be burnt off.

answer is avalanche breakdown

Q29) (………………………………………..) occurs in thin junction( Zener diodes) after this break down, the junction is not destroyed till the current flowing through it exceeds the rated value.

answer is Zener breakdown

Q30) The voltage at which a Zener diode breaks in the reverse bias condition is known as (…………………).

answer is zener voltage Vz

Q31) The range of voltages about the breakdown voltage in which Zener diode conducts in reverse direction is called (……………………).

answer is tolerance

Q32) The maximum power which Zener diode can handle without damage is known as its (………………………..).

answer is is Power rating ( Pzm)

Q33) The maximum value of current which zener diode can handle at its rated voltage without damage is known as its (……………………).

answer is maximum current rating Izm

Q34) The opposition to the current flowing through the Zener diode in the operating region is known as(…………………).

answer is zener resistance (Rz) or zener impedance (Zz)

Q35) For ideal Zener diode ,voltage across the Zener,{ V equal to (………………)}

answer is Vz

Q36) For actual Zener diode , voltage across the Zener ,{V is equal to (………………..)}

answer is Vz+ IzRz

Q37) The important applications of Zener diode are

a) metre protection

b) voltage stabilizer

c) wave shaping

d) All of these

Q38) The silicon diodes which are optimised for their variable capacitance are known as (………………..).

answer is varactors diode.

Q39) (i)The capacitance of a varactor diode is given by the relation

answer is C=EA/W where , w is width of the depleted region,

Q39) (ii) width of the depleted region depends upon the applied voltage and a related as

answer is W = √V

Q40) The diodes in which the energy is radiated in the form of light (photons) and glow are known as (……………).

answer is LEDs (light emitting diode)

Q41) LED are made up of

answer is gallium arsenide phosphide and gallium phosphide

Q42) A diode that is optimised for its sensitivity to light is known as

answer is photodiode

Q43) A special purpose diode in which one side is of metal like gold ,silver or platinum and the other side is of n type semiconductor (silicon) is known as

answer is Schottky diode

Q44) The diodes that keep the current constant flowing through them when the voltage changes are known as (………………………………………)

answer is constant current diodes

Q45) A (………………………….) diode is just a Zener diode in which a doping level is increased to such an extent that its Zener effect occurs near to zero ( say 0.1 volt ).

answer is back diode

Q46) By increasing the doping level we can get breakdown at 0 volt such diodes are known as (…………….)

answer is tunnel diode

Q47) What is true about the breakdown voltage in the Zener diode

a) it decreases when current increases

b) it destroys the diode

c) it approximately constant

d) it equals to the current times of the resistance

Q48) Which of these is the best description of Zener diode

a) it is the rectifier diode

b) it is a constant voltage device

c) it is a constant current device

d) it works in forward region

Q49) The voltage across the Zener resistance is usually

a) small

b) large

c) measured in volts

d) subtracted from the breakdown voltage

Q50) At high frequencies, ordinary diode don’t work properly because of

a) forward biased

b) reverse biased

c) breakdown voltage

d) charge storage

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