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Assertion (A): In a BJT, the base region is very thick. Reason (R): In p-n-p transistor most of holes given off by emitter diffuse through the base. | |
A. | Both A and R are true and R is correct explanation of A [Wrong Answer] |
B. | Both A and R are true but R is not a correct explanation of A [Wrong Answer] |
C. | A is true but R is false [Wrong Answer] |
D. | A is false but R is true [Correct Answer] |
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Explanation:-
Answer : D Discuss it below : !! OOPS Login [Click here] is required to post your answer/result |
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0.0833333333333333
0.208333333333333
0.416666666666667
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ensure proper firing
ensure proper current division
ensure proper voltage division
none of the above
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the total number of sidebands depends on the modulation index
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TRUE
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a few watts
about 500 W
about 2000 W
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⇒ In analog signal given below is sampled at such a rate that the samples of signal can be given to a collection of buffers having capacity of either 24 samples/sec. or 25 samples/sec. The sampling rate is minimum such that it fully utilizes the collection of both types of buffers m(t) = 2 sin 480pt + 3 sin 720 pt<
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1200 Hz
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⇒ A system is said to be marginal stable if
poles lies on Real axis
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poles lies on Imaginary axis
zeros lies on origin
⇒ The impulse response of the DT - LTI system is given be
1 and 2
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about 1000 kV
about 100 kV
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⇒ A parallel ac circuit in resonance will
act like a resistor of low value
have a high impedance
have current in each section equal to the line current
have a high voltage developed across each inductive and capacitive section
⇒ In a single phase full wave regulator feeding a resistive load, the average current over one full cycle
is always zero
cannot be zero
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efficiency of circuit is more
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By using de-emphasis circuit
By using RF amplifier in the receiver
By increasing the number of quantization levels
By sending sloping pulses
⇒ Which of the following is not correct in C?
6 / 4 = 1
2 / 5 = 0
2.0 / 5 = 0
2.0 / 5.0 = 0.4
⇒ Two capacitors of 2 μF and 4 μF capacitance are connected in series across a 30 V dc battery. After the capacitors have been charged, the voltage across them will be
15 V each
10 V and 20 V
20 V and 10 V
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⇒ When a wave reaches the open circuited end of a line
all the forward energy is reflected by the open circuit
all the forward energy is absorbed by the open circuit
a small portion of energy is radiated into atmosphere and the remaining energy is reflected
either (a) or (b)
⇒ In a series RLC high Q circuit the current peaks at a frequency.
equal to the resonant frequency
greater than the resonant frequency
less than the resonant frequency
none
⇒ A transmission line terminates in two branches, each of length λ/4, as shown. The branches are terminated by 50Ω loads. The lines are lossless and have the characteristics impedances shown. Determine the impedance Z_{1} as seen by the so
200Ω
100Ω
50Ω
25Ω
⇒ Two passive elements are connected in series and a dc voltage is applied to the circuit. The time variation of the current is shown in figure. The two elements
one resistance and the other inductance
both resistances
one inductance and the other capacitance
one resistance and the other capacitance
⇒ A dielectric does not have leakage current.
TRUE
FALSE
⇒ The pole of a reactive function
lie on jω axis only
lie on negative real axis only
may lie anywhere on s plane
lie on jω axis or on negative real axis
⇒ In case of low level amplitude modulation system, the amplifiers following the modulated stage must be
class C amplifiers
linear devices
non-linear devices
harmonic devices
⇒ Which of the following features is not associated with Nichols chart?
(0 dB, -180°) point on Nichols chart represent critical Point (-1, 0)
It is symmetric about -180°
M loci are centred about (0 dB, -180°) point
The frequency at intersection of G(jω) locus and M = +3 dB locus gives bandwidth of closed loop system
⇒ The current through a resistance R is shown in figure. The computed value of power
400 ± 0.42 W
400 ± 4.6 W
400 ± 8.85 W
400 ± 10.65 W
⇒ The frequency at which magnitude of closed loop frequency response is 3 dB below its zero frequency value is called critical frequency.
TRUE
FALSE