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Q1. | The carrier mobility in a semiconductor is 0.4 m^{2}/Vs. Its diffusion constant at 300 K will be (in m^{2}/s) |

A. | 0.4 [Wrong Answer] |

B. | 0.16 [Wrong Answer] |

C. | 0.04 [Wrong Answer] |

D. | 0.01 [Correct Answer] |

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Explanation:-
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**Also Read Similar Questions Below :**

⇒ A silicon PN junction diode under reverse bias has depletion region of width 10 μm. The relative permittivity of silicon, ε

_{r}= 11.7 and the permittivity of free space ε

_{0}= 8.85 x 10

^{-12}F/m. The depletion capacitance of the diode per square meter is

100 μF

10 μF

1 μF

20 μF

⇒ In the given figure, the curves 1, 2, 3 are respectively

all pass, minimum phase and non-minimum phase functions

minimum phase, all pass and non-minimum phase functions

non-minimum phase, all pass and minimum phase functions

minimum phase, non-minimum phase and all pass functions

⇒ For a given carrier wave, maximum undistorted power is transmitted when value of modulation is

1

0.8

0.5

0

⇒ In a transistor, current I

_{CBO}flow when

some D.C. voltage is applied in the reverse direction to the emitter junction with the collector open circuit

some D.C. voltage is applied in the forward direction to the collector junction with the emitter open circuit

some D.C. voltage is applied in the reverse direction to the collector junction with the emitter open circuited

some D.C. voltage is applied in the forward direction to the emitter junction with the collector open circuited

⇒

**Assertion (A):** In CC amplifier the collector is at ac ground

**Reason (R):** CC amplifier is also called emitter follower

Both A and R are correct and R is correct explanation for A

Both A and R are correct but R is not correct explanation for A

A is correct R is wrong

A is wrong R is correct

⇒ Which factor determines whether the medium is free space, lossless dielectric, lossy dielectric or good conductor?

Attenuation constant

Constitutive parameters (σ, μ, ε)

Loss tangent

Reflection coefficient

⇒ Transverse electric (TE) waves have

electric field component E in the direction of propagation

magnetic field component H in the direction of propagation

magnetic field component H in the direction of propagation and no component of electric field E in this direction

electric field component E in the direction of propagation and no component of magnetic field H in this direction

⇒ The input to integrating op-amp is a rectangular wave. The output will be

a sine wave

a rectangular wave

a triangular wave

none of the above

⇒ McMurrary full bridge inverter uses

auxiliary commutation

complementary commutation

natural commutation

any of the above

⇒ To realize the full power of 8086 the pin of 8086 connected to ground is

DEN

ALE

INTR

MN / MX

⇒ The design of wave filter is based on characteristic impedance which is

pure resistance

pure reactance

pure resistance in pass band and pure reactance in attenuation band

pure reactance in pass band and pure resistance in attenuation band

⇒ The work done in moving a charge Q on an equipotential line for a distance

*d*will be

V/

*d*

QV/

*d*

Q.

*d*

zero

⇒

Match the following:

List I (Operation in Basic) | List II (Priority) | ||
---|---|---|---|

A. | Exponentiation | 1. | 1 |

B. | Multiplication and division | 2. | 2 |

C. | Addition and subtraction | 3. | 3 |

D. | Expression within parenthesis | 4. | 4 |

A-1, B-2, C-3, D-4

A-2, B-3, C-1, D-4

A-4, B-3, C-2, D-1

A-2, B-3, C-4, D-1

⇒ The number of thyristors in a single phase fully controlled bridge rectifier is

16

8

4

2

⇒ Two coupled coils have self inductance L

_{1}and L

_{2}. The coefficients of coupling is

*k*. The mutual inductance is

*k*L

_{1}L

_{2}

*k*

^{2}L

_{1}L

_{2}

*k*L

_{1}L

_{2}

*k*L

_{1}L

_{2}

⇒ What happens when forward bias is applied to a junction diode?

Majority carrier current is reduced to zero

Minority carrier current is reduced to zero

Potential barrier is increased

Potential barrier is decreased

⇒ The number of inputs and outputs of a full adder are

3 and 2 respectively

2 and 3 respectively

4 and 2 respectively

2 and 4 respectively

⇒ The transient currents are due to

resistance of the circuit

impedance of the circuit

voltage applied to the circuit

changes in stored energy in inductors and capacitors

⇒ In Z

_{RC}(

*s*) has a pole at

*s*= 0, the first element in second Foster realization is

R

C

R and C in series

R and C in parallel

⇒ For small size high frequency coils, the most common core material is

air

ferrite

powdered iron

steel

⇒ In radar system if the antenna diameter is increased by a factor of 4, the minimum range will increased by a factor of

1

2

22

4

⇒ In D-type FF, Preset (Pr) and clear (Clr) inputs are called

Synchronous

Asynchronous

Data

None

⇒ The time constant of the circuit in figur

RC

2 RC

3 RC

5 RC

⇒ Find V

_{th}in the cir

100 V

10 V

0 V

5 V

⇒ In molecules of ionic crystals, orientation polarization is zero.

TRUE

FALSE

⇒ A current of 1 A in the coil of an iron cored electromagnet cause a flux density of 0.2.T. If the current is 2 A, B=

0.2 T

0.4 T

0.4 T or less

0.4 T or more

⇒ The most commonly used logic family is

ECL

TTL

CMOS

PMOS

⇒ In an

*n*type semiconductor

number of free electrons and holes are equal

number of free electrons is much greater than the number of holes

number of free electrons may be equal or less than the number of holes

number of holes is greater than the number of free electrons

⇒ The multiplication of two

*n*bit numbers gives a product of length less than or equal to

*n*bits

2

^{n}bits

2

*n*bits

2

^{n}- 1 bits

⇒ A clipper

adds a dc component to the input signal

removes signal voltages above or below a specified value

both (a) and (b)

either (a) or (b)