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Which of the following types of noise assumes greater importance at high frequencies? | |
A. | Transit time noise [Correct Answer] |
B. | Shot noise [Wrong Answer] |
C. | Impulse noise [Wrong Answer] |
D. | Random noise [Wrong Answer] |
View Answer
Explanation:-
Answer : A Discuss it below : !! OOPS Login [Click here] is required to post your answer/result |
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increases
increases or decreases
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used short pieces of wire
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decreases
increases
remain the same
decreases or remains the scheme
⇒ Two ammeters having resistances of 0.5 Ω and 0.25 Ω and having full scale reading of 25 A each are connected in parallel. To ensure that neither of them goes beyond scale, the total current should not be more than
50 A
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⇒ A rare gas has N atoms per m^{3}. If electronic polarizability of single atom of this gas is a_{e}, then
∈_{r} = Na_{e}
∈_{0}∈_{r} = Na_{e}
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⇒ The standard intermediate frequency for FM ratio is
10.7 MHz
4.5 MHz
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455 kHz
⇒ A 4 bit synchronous counter has flip flops having propagation delay of 50 ns each and AND gates having propagation delay of 20 ns each. The maximum frequency of clock pulses can be
20 MHz
50 MHz
14.3 MHz
5 MHz
⇒ If Laplace transform of f(t) is F(s), then £ f(t - a) u (t - a)= 0
e^{as} F(s)
e^{-as} F(s)
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- e ^{-as} F(s)
⇒ In a system an input resistance of 20 kΩ causes a noise voltage of 15μV. If two such input resistances each of 20 kΩ are used in parallel, the total noise voltage will be about
15 μV
30 μV
7.5 μV
10.6 μV
⇒ The characteristic equation of flip-flop gives the next state Q_{N + 1} in terms of present state Q_{N} and the inputs. Which one of the following is the characteristic equation of J - K flip-flop?
Q_{N+1} = JQ_{N} + KQ_{N}
Q_{N+1} = J + KQ_{N}
Q_{N+1} = KQ_{N} + JQ_{N}
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⇒ The velocity factor of a transmission line depends on
temperature
skin effect
relative permittivity of dielectric
none of the above
⇒ A digital voltmeter has a 4 1/2 digit display. The 1 V range can measure voltage up to
0.9999 V
1.9999 V
0.199 V
9.999 V
⇒ 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
⇒ The owner of a communication satellite is usually required to keep the spacecraft on station at its assigned place in the geosynchronous orbit with an accuracy of __________ degree.
0.1
1
2
0.5
⇒ When a transistor is to be at a temperature above 25°C
smaller heat sink be provided
maximum power rating be derated
biasing circuit must be strengthened
earth connections must be connected through a resistor
⇒ In low pass filter of figure R_{0} = 1 Ω and cut off frequency is 1 rad/sec. The values of L and C
1 H and 2 F
1 H and 1 F
2 H and 1 F
1 H and 2 F
⇒ The response to sinusoidal excitation can be found by
settings s = jω in the network function
settings s = - jω in the network function
taking inverse transform of network function
none of the above
⇒ The temperature coefficient of a thermistor
is positive
is negative
zero
may be positive or negative depending on its composition
⇒ The shape of torque-speed curve of a two phase servo- motor mostly depends on
ratio of rotor reactance to rotor resistance
ratio of stator reactance to rotor resistance
ratio of rotor reactance to rotor resistance and also the ratio of stator reactance to stator resistance
magnitude of stator voltages
⇒
Assertion (A): Electron concentration n, hole concentration p and charge concentration n_{i} are related by n_{i}^{2} = np.
Reason (R): p type semiconductor is obtained by adding trivalent impurity to intrinsic semiconductor.
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
⇒ Which of the following is not a travelling wave?
e = E_{m} sin (βx - ωt)
e = E_{m} cos (βx - ωt)
e = E_{m} sin (ωt - βx)
e = E_{m} sin (βx)
⇒ A doped semi-conductor is called
impure semi-conductor
dipole semi-conductor
bipolar semi-conductor
extrinsic semi-conductor
⇒
Match the following:
List I (Operator) | List II (Description) | ||
---|---|---|---|
A. | ! = | 1. | Left shift |
B. | = = | 2. | Right Shift |
C. | < < | 3. | Equal to |
D. | > > | 4. | Not equal to |
A-1, B-2, C-3, D-4
A-2, B-3, C-4, D-1
A-4, B-1, C-3, D-2
A-4, B-3, C-1, D-2
⇒ If operator 'a' = 1 ∠120° then (1 - a^{2}) =
1 ∠ - 30°
1 ∠ 30°
1 ∠ - 60°
1 ∠60°
⇒ A pre-emphasis circuit provides extra noise immunity by
converting the phase modulation of FM
preamplifying the whole audio band
amplifying the higher audio frequencies
boosting the pass frequencies
⇒ Calculate the stability factor and change in I_{C} from 25°C to 100°C for, β = 50, R_{B}/ R_{E} = 250, ΔI_{C0} = 19.9 nA for emitter bias configuration.
42.53, 0.85 μA
40.91, 0.58 μA
40.91, 0.58 μA
41.10, 0.39 μA
⇒ For addition and subtraction operations, phasors
must be represented in polar form
must be represented in rectangular form
may be represented in any form
none of the above