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Assertion (A): In AM the amplitude of carrier is made proportional to the instantaneous amplitude of modulating wave Reason (R): In AM, frequency of side band = frequency carrier ± frequency of modulating wave. | |
A. | Both A and R are correct and R is correct explanation of A [Wrong Answer] |
B. | Both A and R are correct but R is not correct explanation of A [Correct Answer] |
C. | A is correct but R is wrong [Wrong Answer] |
D. | A is wrong but R is correct [Wrong Answer] |
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Explanation:-
Answer : B Discuss it below : !! OOPS Login [Click here] is required to post your answer/result |
Also Read Similar Questions Below :
⇒ Consider the sequence x(n) whose fourier transform X(e^{jω}) is depicted for - p ≤ ω ≤ p as shown in fig
1 - True, 2 - True, 3 - True, 4 - True
1 - False, 2 - True, 3 - False, 4 - True
1 - True, 2 - False, 3 - True, 4 - False
1 - False, 2 - False, 3 - False, 4 - True
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a straight line
a circle
an ellipse
a square
⇒ For a bit rate of 8 kbps, the best possible values of the transmitted frequencies in a coherent binary FSK system are
16 kHz and 20 kHz
20 kHz and 32 kHz
20 kHz and 40 kHz
32 kHz and 40 kHz
⇒ The two conductors of a single phase transmission line suspended in air carry currents in opposite directions. The force per unit length on each conductor varies
directly as the current in either conductor
directly as the distance between the two conductors
directly as the square of the current in either conductor
inversely as the square of the distance between the two conductors
⇒ 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}
⇒ A cycloconverter is
ac-dc converter
dc-ac converter
dc-dc converter
ac-ac converter
⇒ The thermionic emission current is given by
Fermi-Dirac distribution
Maxwell's equation
Richardson Dushman equation
Langmuir Child law
⇒ The number of product terms in the minimized sum of product expression obtained through the following K-map, where d, don't c
2
3
4
5
⇒ The waveguides compared to equivalent transmission lines at low frequency are
able to carry more power
less noisy
having lower attenuation
all of the above
⇒ The decimal equivalent of ABC_{16} is
348
2583
2748
33
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Match the following:
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---|---|---|---|
A. | Reciprocity | 1. | Impedance matching |
B. | Tellegen's | 2. | Bilateral |
C. | Superposition | 3. | ∑ V_{jk} I_{jk} = 0 |
D. | Maximum power transfer | 4. | Linear |
5. | Non linear |
A-1, B-2, C-3, D-4
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A 6 H, 1
A 6 H, 0
00 H, 0
00 H, 1
⇒ CMRR of a difference amplifier is equal to
(A_{v}')/(A_{com})
A_{v}/A_{com}
A_{com}/A_{v}'
(A_{v})/(A_{com})^{2}
⇒ Consider the following Statements regarding resistance strain gauge
- The gauge factor is in the range of 2 to 5.
- The resistance changes due to change in specific resistance with strain.
- The resistance increases with increase in temperature.
1, 2, 3
1 and 2
2 and 3
1 and 3
⇒ The power density spectrum of noise voltage of resistor R can be expressed as
2 kTR
1 kTR
0.5 kTR
0.25 kTR
⇒ In the basic series inverter circuit, the source current has
low harmonic content
high harmonic content
low or high harmonic content depending on firing angle
zero harmonic content
⇒ A rectangular waveguide has a discontinuity in the form of reduced narrow dimension. In the equivalent circuit this discontinuity can be represented by
a shunt capacitance at the discontinuity
a shunt inductance at the discontinuity
a shunt resistance at the discontinuity
none of the above
⇒ The number of layers in a Shockley diode are
2
3
4
2 or 3
⇒ In the circuit shown below, the outputs Y_{1} and Y_{2} for the given initial condition Y_{1} = Y_{2} = 1 and after four input pulses wil
Y_{1} = 1, Y_{2} = 0
Y_{1} = 0, Y_{2} = 0
Y_{1} = 0, Y_{2} = 1
Y_{1} = 1, Y_{2} = 1
⇒ When R and C are connected in parallel, phase angle of Y is positive.
TRUE
FALSE
⇒ In CE connection, the leakage current of a transistor is about
10 x 10^{-9} A
5 x 10^{-6} A
200 x 10^{-6} A
5 x 10^{-3} A
⇒ It is possible to copy a file in the same directory.
TRUE
FALSE
⇒ What is the direction of control
Unidirectional into μp
Unidirection out of μp
Bidirectional
Mixed direction, i.e., some lines into μp an some others out of μp
⇒ 74 HC series can sink upto 4 mA. The 74 LS series has I_{IL(max)} - 0.4 mA. How many 74 LS inputs be driven by 74 HC output?
100
none
8
10
⇒ For a BJT if β = 50, I_{CEO} = 3 μA and I_{C} = 1.2 mA then I_{B}
24 μA
23 μA
20 μA
10 μA
⇒ A receiver having poor IF selectivity will also have poor
sensitivity
double spotting
blocking
all of the above
⇒ Symbol shown in figure represen
P-channel DEMOSFET
N-channel DEMOSFET
UJT with N-type base
UJT with P-type base
⇒ The total number of input words for 4 input OR gate is
20
16
12
8
⇒ In a dynamometer instrument, the moving coil is pressure coil.
TRUE
FALSE
⇒
Match the following:
List I | List II | ||
---|---|---|---|
A. | Former | 1. | Produces deflecting torque |
B. | Coil | 2. | Provides base for coil |
C. | Core | 3. | Makes the magnetic field radial |
D. | Spring | 4. | Provides controlling torque |
A-1, B-2, C-3, D-4
A-2, B-1, C-3, D-4
A-1, B-2, C-4, D-3
A-2, B-1, C-4, D-3