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Q1. | For a NPN bipolar transistor, what is the main stream of current in the base region? |

A. | Drift of holes [Wrong Answer] |

B. | Diffusion of holes [Correct Answer] |

C. | Drift of electrons [Wrong Answer] |

D. | Diffusion of electrons [Wrong Answer] |

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Explanation:-
Answer : BDiscuss it below :!! OOPS Login [Click here] is required to post your answer/resultHelp other students, write article, leave your comments |

**Also Read Similar Questions Below :**

⇒ For the circuit shown in the figure, the time constant RC = 1 ms. The input voltage is V

_{1}(

*t*) = 2 sin 10

^{3}

*t*. The output voltage V

_{0}(

*t*) is equa

sin (10

^{3}

*t*- 45°)

sin (10

^{3}

*t*+ 45°)

sin (10

^{3}

*t*- 53°)

sin (10

^{3}

*t*+ 53°)

⇒ The point P in the following figure is stock at 1. The output

*f*wil

ABC

A

AB C

A

⇒ A series resonant circuit is fed by a voltage having rms value V. At resonance, the voltage across inductance V

_{L}and voltage across capacitance V

_{C}are related as

V

_{L}> V

_{C}

V

_{L}< V

_{C}

V

_{L}= V

_{C}

V

_{L}= 0.5 V

_{C}

⇒ Pico-farad is equal to

10

^{-6}farad

10

^{-12}farad

10

^{-3}farad

10

^{-9}farad

⇒ Which DOS command improves memory usage?

MEM MAKER

MOVE

MEM IM

None on the above

⇒ Which of the following is not a valid variable name in C?

*p o, t*

*p o t*

*po*_

*t*

*p*_

*ot*

⇒ Pick the odd one out

PPM

PDM

PWM

PLM

⇒ In a single phase full wave regulator feeding R-L load, short gate pulse are not suitable.

TRUE

FALSE

⇒

**Assertion (A):** The 'do while' statement is used less frequently than the 'while' statement.

**Reason (R):** For most applications it is more natural to test for continuation of loop at the beginning than at the end of loop.

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

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

A is correct R is wrong

A is wrong R is correct

⇒ In a vacuum tube, the transit time of electron between cathode and anode is important at

low frequencies

high frequencies

both (a) and (b)

frequencies which are neither very low nor very high

⇒ The internal impedance of a source is 3 +

*j*4 Ω. It is desired to supply maximum power to a resistive load. The load resistance should be

3 Ω

4 Ω

7 Ω

5 Ω

⇒ In an

*n*type semiconductor the fermi level is 0.35 eV below the conduction band, the concentration of donor atoms is increased to three times. The new position of Fermi level will be

0.35 eV below conduction band

about 0.32 eV below conduction band

about 0.32 eV above conduction band

about 0.1 eV below conduction band

⇒ If X = 1 in the logic equation [X + Z { Y + (Z + X Y)}] { X + Z (X + Y)} = 1, then

Y = Z

Y = Z

Z = 1

Z = 0

⇒ If an amplifier with gain of - 1000 and feedback factor β = - 0.1 had a gain change of 20% due to temperature, the change in gain of the feedback amplifier would be

0.1

0.05

0.002

0.0001

⇒ For a random variable

*x*following the probability density function, p(

*x*), shown in figure, the mean and the variance are respective

1/2 and 2/3

1 and 4/3

1 and 2/3

2 and 4/3

⇒ A transistor has two

*p*-

*n*junctions. The batteries should be connected such that

both junctions are forward biased

both junctions are reverse biased

one junction is forward biased and the other is reverse biased

none of the above

⇒ A system has 12 poles and 2 zeros. Its high frequency asymptote in its magnitude plot has a slope of

-200 dB/decade

-240 dB/decade

-280 dB/decade

-320 dB/decade

⇒ The output

*y*(

*t*) of a linear time invariant system is related to its input

*x*(

*t*) by the following equation

*y*(

*t*) = 0.5

*x*(

*t*-

*t*

*+ 1) +*

_{d}*x*(

*t*-

*t*

*) + 0.5*

_{d}*x*(

*t*-

*t*

*+ 7). The filter transfer function*

_{d}*H*(ω) of such a system is given by

(1 + cos ωt)

*e*

^{-jωt}

*d*

(1 + 0.5 cos ωt)

*e*

^{-jωt}

*d*

(1 + cos ωt)

*e*

^{jωt}

*d*

(1 - 0.5 cos ωt)

*e*

^{-jωt}

*d*

⇒ A coil is connected across a 200 V, 50 Hz supply and takes a current of 10 A. The loss in the coil is 1000 W. The impedance and resistance of the coil are

10 Ω, 8 Ω

15 Ω, 8 Ω

20 Ω, 10 Ω

30 Ω, 15 Ω

⇒ In a medium if ε, μ and σ are constant throughout the medium, then it is known as

perfect vacuum

distributed medium

homogeneous medium

dielectric medium

⇒ In the circuit shown in the given figure, power dissipated in the 5 Ω resisto

zero

80 W

125 W

405 W

⇒ A 3 stage Johnson counter shown in figure is clocked at a constant frequency of

*f*

_{c}from the starting state of Q

_{0}Q

_{1}Q

_{2}= 101. The frequency of output Q

_{0}Q

_{1}Q

_{2}wil

*f*/2

_{c}*f*/3

_{c}*f*/6

_{c}*f*/8

_{c}⇒ The damping coefficient for the given circuit is _______

42737

42739

2

1

⇒ Nibble is

a string of 4 bits

a string of 8 bits

a string of 16 bit

a string of 64 bits

⇒ Breakdown in dielectric may be

electrical breakdown

thermal breakdown

electrochemical breakdown

any of the above

⇒ The best excited reflector from a wave guide is

horn

parabolic

biconical

corner

⇒ A linear discrete time system has the char. equation

*z*

^{3}- 0.81

*z*= 0, the system is

stable

marginally stable

unstable

stability cannot be assessed from the given information

⇒ A cycloconverter for single phase operation has

one positive group and one negative group converters

two positive group and two negative group converters

three positive group and three negative group converters

any of the above

⇒ In figure the effective resistance faced by voltage source

1 Ω

2 Ω

3 Ω

3.3 Ω

⇒ A particular current is made up of two components 10A dc and sinusoidal current of peak value 14.14A. The average of resultant current is

zero

24.14A

10A

14.14A