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Electronic Devices And Circuits Online Exam Quiz

Important questions about Electronic Devices And Circuits. Electronic Devices And Circuits MCQ questions with answers. Electronic Devices And Circuits exam questions and answers for students and interviews.

1. A p - n junction diode has

Options

A : low forward and high reverse resistance

B : a non-linear v - i characteristics

C : zero forward current till the forward voltage reaches cut in value

D : all of the above

2. Assertion (A): The reverse saturation current in a semiconductor diode is 4nA at 20°C and 32 nA at 50°C. Reason (R): The reverse saturation current in a semiconductor diode doubles for every 10°C rise in temperature.

Options

A : Both A and R are true and R is correct explanation of A

B : Both A and R are true but R is not a correct explanation of A

C : A is true but R is false

D : A is false but R is true

3. Calculate the stability factor and change in I C from 25°C to 100°C for, ? = 50, R B / R E = 250, ?I C0 = 19.9 nA for emitter bias configuration.

Options

A : 42.53, 0.85 ?A

B : 40.91, 0.58 ?A

C : 40.91, 0.58 ?A

D : 41.10, 0.39 ?A

4. An increase in temperature increases the width of depletion layer.

Options

A : True

B : False

C :

D :

5. An amplifier without feedback has a voltage gain of 50, input resistance of 1 k? and output resistance of 2.5 k?. The input resistance of the current shunt - ve feedback amplifier using the above amplifier with a feedback factor of 0.2 is

Options

A : 1/11 k?

B : 1/5 k?

C : 5 kW

D : 11 kW

6. Work function is the maximum energy required by the fastest electron at 0 K to escape from the metal surface.

Options

A : True

B : False

C :

D :

7. Crossover distortion behaviour is characteristic of

Options

A : class A O/P stage

B : class B O/P stage

C : class AB output stage

D : common pulse O/P state

8. In which of these is reverse recovery time nearly zero?

Options

A : Zener diode

B : Tunnel diode

C : Schottky diode

D : PIN diode

10. In which region of a CE bipolar transistor is collector current almost constant?

Options

A : Saturation region

B : Active region

C : Breakdown region

D : Both saturation and active region

1. The types of carriers in a semiconductor are

Options

A : 1

B : 2

C : 3

D : 4

2. When a voltage is applied to a semiconductor crystal then the free electrons will flow.

Options

A : towards positive terminal

B : towards negative terminal

C : either towards positive terminal or negative terminal

D : towards positive terminal for 1 ?s and towards negative terminal for next 1 ?s

3. In a bipolar transistor the barrier potential

Options

A : 0

B : a total of 0.7 V

C : 0.7 V across each depletion layer

D : 0.35 V

4. The word enhancement mode is associated with

Options

A : tunnel diode

B : MOSFET

C : JFET

D : photo diode

5. At very high temperatures the extrinsic semi conductors become intrinsic because

Options

A : drive in diffusion of dopants and carriers

B : band to band transition dominants over impurity ionization

C : impurity ionization dominants over band to band transition

D : band to band transition is balanced by impurity ionization

6. A potential of 7 V is applied to a silicon diode. A resistance of 1 K ohm is also in series with the diode. The current is

Options

A : 7 mA

B : 6.3 mA

C : 0.7 mA

D : 0

7. Secondary emission is always decremental.

Options

A : True

B : False

C :

D :

8. The number of doped regions in PIN diode is

Options

A : 1

B : 2

C : 3

D : 1 or 2

9. In an n channel JFET, the gate is

Options

A : n type

B : p type

C : either n or p

D : partially n & partially p

10. Recombination produces new electron-hole pairs

Options

A : True

B : False

C :

D :

1. A silicon (PN) junction at a temperature of 20°C has a reverse saturation current of 10 pico Ampere. The reverse saturation current at 40°C for the same bias is approximately.

Options

A : 30 pA

B : 40 pA

C : 50 pA

D : 60 pA

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