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The phenomenon known as "Early effect" in a BJT refers to a reduction of the effective base width caused by | |
A. | electron-hole recombination at the base [Wrong Answer] |
B. | reverse biasing of the base collector junction [Correct Answer] |
C. | forward biasing of emitter base junction [Wrong Answer] |
D. | the early removal of stored base charge during saturation to cut off switching [Wrong Answer] |
View Answer
Explanation:-
Answer : B Discuss it below : !! OOPS Login [Click here] is required to post your answer/result |
Also Read Similar Questions Below :
⇒ For a parallel two wire line with both conductors touching each other, the characteristic impedance is about
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200 Ω
80 Ω
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⇒ A bridge rectifier circuit has input of 50 Hz frequency. The load resistance is R_{L} and filter capacitance is C. For good output wave shape, the time constant R_{L}C should be at least equal to
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A is true but R is false
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⇒ For a parallel two wire line with both conductors touching each other, the characteristic impedance is about
300 Ω
200 Ω
80 Ω
24 Ω
⇒ The Boolean function realized by the logic circuit show
F = Σm(0, 1, 3, 5, 9, 10, 14)
F = Σm(2, 3, 5, 7, 8, 12, 13)
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F = Σm(2, 3, 5, 7, 8, 9, 12)
⇒ An accelerometer has a seismic mass of 0.05 kg and spring constant of 3 x 10^{5} N/m. If maximum displacement of mass is ± 1 mm, the maximum acceleration which can be measured is
30 m/s^{2}
60 m/s^{2}
90 m/s^{2}
120 m/s^{2}
⇒ Noise temperature of Sun is more than __________ °K.
1000
5000
100000
500
⇒ A lag compensator is essentially a
low pass filter
high pass filter
band pass filter
either (a) or (b)
⇒ Which of the following is non-sinusoidal oscillator?
Multivibrator
Relaxation oscillator using UJT
Relaxation oscillator using tunnel diode
Any of the above
⇒ Brewster angle is the angle for which there is
no reflection and the incident wave is vertically polarized
reflection and the incident wave is horizontally polarized
no reflection and the incident wave is horizontally polarized
none of the above
⇒ The braking torque in single phase energy meter is proportional to speed of disc.
TRUE
FALSE
⇒ A meter coil has a resistance of 100 Ω and a full scale deflection current of 10 mA. To convert it into a voltmeter of 0-200 V range, the series resistance should be
20 kΩ
19.9 kΩ
1.9 kΩ
20.1 kΩ
⇒ In a CE amplifier the input impedance is equal to the ratio of
ac base voltage to ac base current
ac base voltage to ac emitter current
ac emitter voltage to ac collector current
ac collector voltage to ac collector current
⇒ If σ standard deviation, probable error
σ
± 1.19 σ
± 0.6745 σ
± 0.4125 σ
⇒ The integral of a unit step function is
a unit impulse function
a unit pulse function
a ramp function of slope 1
none of the above
⇒ An electromagnetic wave incident on a perfect conductor is
fully transmitted
partially transmitted
entirely reflected
none of the above
⇒ Computers use thousands of flip-flops. To coordinate the overall action, a common signal is sent to all flip-flop known as
debug signal
toggle signal
active signal
clock signal
⇒ If operator 'a' = 1 ∠120° then (1 + a + a^{2}) =
-a
-a^{2}
1
0
⇒ Two sinusoidal waves 1 and 2 have peak values V_{m1} and V_{m2}. Wave 1 is leading wave 2 by ∠θ. Which of the following is correct?
v_{1} = V_{m1} sin θ and v_{2} = V_{m2} cos θ
v_{1} = V_{m1} sin ωt and v_{2} = V_{m2} sin (ωt - θ)
v_{1} = V_{m1} sin (ωt + θ/2) and v_{2} = V_{m2} sin ωt
none of the above
⇒ In CCIR-B system, the time between start of one H syn. pulse and next is
64 μs
6.4 μs
640 μs
0.64 μs
⇒ With regard to a transmission line, which of the following statements is correct?
Any impedance repeats itself every 1/4 on the Smith chart.
The S.W.R. = 2 circle and the magnitude of reflection coefficient = 0.5 circle coincide on the Smith chart.
At any point on a transmission line, the current reflection coefficient is the reciprocal of the voltage reflection coefficient.
Matching eliminates the reflected wave between the source and the matching device location.
⇒ Which of the following characteristics of a silicon p-n junction diode make it suitable for use as ideal diode?
- It has low saturation current.
- It has high value of cut in voltage.
- It can withstand large reverse voltage.
- When compared with germanium diode, silicon diode shows a lower degree of temperature dependence under reverse conditions.
1 and 2
1, 2, 3, 4
2, 3, 4
1, 3
⇒ If f(t) = 1, F(jω) =
2p
p
2pδ (p)
pδ (ω)
⇒ According to Barkhausen criteria in order to sustain the oscillations
loop gain of the circuit must be negligible
loop gain of the circuit must be equal to unity
the phase shift around the circuit must be 180°
none of the above
⇒ If J = 12 and X = 24.4 the result of the following FORTRAN 77 program will be
15.0, 144.0, 73.2
15.0, 144.0, 73
15. 144. 73
⇒ In a series RLC circuit for lower frequency power factor is ________
leading, Lagging
lagging, Leading
independent of frequency
same
⇒ A certain sound has 10000 times more energy than another sound. The number of times it would sound stronger to a listener is
40
10000
100
10
⇒ If the midband gain of an amplifier is 40 dB, the gain at half power frequency is
37 dB
30 dB
20 dB
13 dB
⇒ Which material is generally used for LED?
Compounds of silica
Compounds of gallium
Compounds of phosphorus
Compounds of sulphur
⇒ If f_{1} and f_{2} and half-power frequency and f_{0} be resonant frequency, the selectivity of R-L-C series circuit is given by
(f_{2} - f_{1})/2f_{0}
(f_{2} - f_{1})/f_{0}
(f_{2} - f_{0})/(f_{1} - f_{0})
(f_{2} - f_{1})/(f_{1} - f_{0})
⇒ A bridge rectifier circuit has input of 50 Hz frequency. The load resistance is R_{L} and filter capacitance is C. For good output wave shape, the time constant R_{L}C should be at least equal to
10 ms
20 ms
50 ms
100 ms
⇒ How many different binary numbers can be stored in a register consisting of six switches?
16
32
64
128
⇒
Assertion (A): Intrinsic resistivity of silicon is lower than that of germanium.
Reason (R): Magnitude of free electron concentration in germanium is more than that of silicon.
Both A and R are true and R is correct explanation of A
Both A and R are true but R is not correct explanation of A
A is true but R is false
A is false but R is true