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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] |
View Answer
Explanation:-
Answer : B Discuss it below : !! OOPS Login [Click here] is required to post your answer/result |
Also Read Similar Questions Below :
⇒ If the iron core of a coil is removed so that it becomes an air cored coil, its inductance
will increase
will decrease
will remain the same
may increase or decrease
⇒ The frame of an electric motor is earthed through three earthing plates resistances 30 Ω, 20 Ω and 10 Ω respectively. During fault the energy dissipated by three plates are W_{1}, W_{2} and W_{3}. Then
W_{1} > W_{2} > W_{3}
W_{1} < W_{2} < W_{3}
W_{1} = W_{2} = W_{3}
W_{1} + W_{3} < W_{2}
⇒ The integral of a unit step function is
a unit impulse function
a unit pulse function
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none of the above
⇒ Which one is true for writing array variable in Pascal?
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⇒ In an ac circuit that delivers constant power at varying p.f., the current is
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⇒ A 3 phase semiconverter when supplying a certain load has a rectification efficiency of 0.6 and transformer utilisation factor of 0.35. When a 3 phase full converter is supplying the same load
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⇒ The characteristic equation of a control system is given as s^{4} + 8s^{3} + 24s^{2} + 32s + K = 0. What is the range of values of K for this system to be stable?
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0 ≤ K < 100
0 ≤ K < 2300
0 ≤ K < 600
⇒ If the iron core of a coil is removed so that it becomes an air cored coil, its inductance
will increase
will decrease
will remain the same
may increase or decrease
⇒ The frame of an electric motor is earthed through three earthing plates resistances 30 Ω, 20 Ω and 10 Ω respectively. During fault the energy dissipated by three plates are W_{1}, W_{2} and W_{3}. Then
W_{1} > W_{2} > W_{3}
W_{1} < W_{2} < W_{3}
W_{1} = W_{2} = W_{3}
W_{1} + W_{3} < W_{2}
⇒ 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
⇒ Which one is true for writing array variable in Pascal?
The general form of an array variable is an integer or a real variable name followed by subscripts enclosed within square brackets. The subscripts are separated by commas
The general form of an array variable must be an integer name followed by subscripts enclosed within square brackets. The subscripts are separated by commas
The subscripts in array variable must be separated by dots
The subscripts must be enclosed within parenthesis
⇒ For underdamped second order systems the rise time is the time required for the response to rise from
0% to 100% of its final value
10% to 90% of its final value
5% to 95% of its final value
either (a) or (b)
⇒ Consider the following sets of values of E, R and C for the circuit in the given fig
1 and 4
1 and 2
3 and 4
2 and 3
⇒ What is the correct sequence of the following step in the fabrication of a monolithic, Bipolar junction transistor?
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- Base diffusion
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3, 4, 1, 2
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⇒ Which of the following is not an interrupt line in 8085?
TRAP
RST 5.5
RST 7.5
RST 9.5
⇒
Assertion (A): Negative feedback reduces the bandwidth of an amplifier
Reason (R): Negative feedback stabilizes the gain of an amplifier
Both A and R are correct and R is correct explanation for A
Both A and R are correct but R is not correct explanation for A
A is correct R is wrong
A is wrong R is correct
⇒ In a two terminals network the O.C. voltage measured at the given terminals is 100 V and s.c., currents at the same terminals 5 A. If a load of 80 Ω resistance is connected at the terminals, load current is
0.0416666666666667
1.25 A
0.25
6.25 A
⇒ A Charge Couple Device (CCD) is a
RAM
sequential accessed memory
content addressable memory
read only memory
⇒ In microwave communication, some times, microwave signals reach large distances by following the earth curvature. This phenomenon is called
tropospheric scatter
faraday effect
ionospheric reflection
ducting
⇒ Which of the following statements about the matched filter in a communication receiver are correct?
- Its impulse response depends on the signed shape
- It maximizes the SNR at the detection shape.
- It produces ISI.
- It may produce phase error if synchronization is improper.
1 and 4 only
1 and 2 only
2, 3 and 4
1, 2 and 4
⇒ The number of distinct Boolean expressions of 3 variables is
8
256
64
7
⇒ Which instrument needs creep compensation?
Dynamometer wattmeter
Induction wattmeter
Energy meter
Both (b) and (c)
⇒ An inverting voltage feedback is a
voltage amplifier
current amplifier
current to voltage converter
voltage to current converter
⇒ The transistor specification number 2N refers to
triac
diac
junction transistor
FET with one gate
⇒ Read the following statements about time and space requirements of microprocessors
- Space requirement is also known as memory requirement.
- Space requirement is expressed in terms of bytes.
- Time requirement is expressed in terms of states.
- Time requirement is expressed in terms of μ- s.
1, 2 and 3 only
1, 2 and 4 only
2 and 3 only
1 and 4 only
⇒ The resistance of resistance strain gauge is about
5 Ω
50 Ω
120 Ω
0.5 Ω
⇒ If the variance σ_{x}^{2} of d(n) = x(n) - x(n - 1) is one-tenth the variance σ_{x}^{2} of a stationary zero mean discrete time signal x(n), then the normalized autocorrelation function R_{xx}(x)/σ_{x}^{2} at k = 1 is
0.95
0.9
0.1
0.05
⇒ If an inverter is placed at the input to an SR flip-flop, the result is
T flip-flop
D flip-flop
JK flip-flop
BCD decade counter
⇒ The fourier transform of a voltage signal x(t) is X(f). The unit of X(f) is __________ .
volts
volt^{2}
volt/sec
volt-sec
⇒ A 2 mH inductor with some initial current can be represented as shown below, where s is the Laplace transform variable. The value of initial curren
0.5 A
1.0 A
2.0 A
0.0 A
⇒ Dielectric constant, under the condition of alternating fields, is a complex quantity.
TRUE
FALSE
⇒ An RL admittance function can also be realized as
RC admittance function
RC impedance function
LC admittance function
LC impedance function
⇒ A standard waveguide W R90 has inside wall dimensions of a = 2.286 cm and b = 1.016 cm. What is the cut-off wavelength for TE_{01} mode?
4.572 cm
2.286 cm
2.032 cm
1.857 cm
⇒ In an ac circuit that delivers constant power at varying p.f., the current is
lowest when p.f. is leading
lowest when p.f. is lagging
lowest when p.f is unity
the same for all power factors
⇒ When ω_{m} is the modulation frequency in frequency modulation, the modulation index is proportional to
ω_{m}
ω^{2}_{m}
1/ω_{m}
1/ω^{2}_{m}
⇒ A 3 phase semiconverter when supplying a certain load has a rectification efficiency of 0.6 and transformer utilisation factor of 0.35. When a 3 phase full converter is supplying the same load
rectification efficiency will be more than 0.6 and TUF will be more than 0.35
rectification efficiency will be more than 0.6 but TUF will be less than 0.35
rectification efficiency will be less than 0.6 and TUF will be less than 0.35
rectification efficiency will be less than 0.6 but TUF will be more than 0.35
⇒ The characteristic equation of a control system is given as s^{4} + 8s^{3} + 24s^{2} + 32s + K = 0. What is the range of values of K for this system to be stable?
0 ≤ K < 80
0 ≤ K < 100
0 ≤ K < 2300
0 ≤ K < 600