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Q1. | When a complex signals is used to frequency modulate a carrier, the resulting sideband distribution is |

A. | symmetrical about the carrier [Correct Answer] |

B. | not necessarily symmetrical about the carrier [Wrong Answer] |

C. | decided by the predominant sidebands [Wrong Answer] |

D. | none of the above [Wrong Answer] |

View Answer
Explanation:-
Answer : ADiscuss it below :!! OOPS Login [Click here] is required to post your answer/resultHelp other students, write article, leave your comments |

**Also Read Similar Questions Below :**

⇒ In the diode circuit shown in figure the diodes are ideal. The impedance seen by source is

1 k ohm

2 k ohm

0.5 k ohm

infinite

⇒ It is necessary to measure the amplitudes of two signals and also the phase difference between them. This can be done by using a

phase meter

waveform meter

vector voltmeter

digital voltmeter

⇒ If Z is the number of zeros of 1 + G(

*s*) H(

*s*) in the right half

*s*plane. N is the number of clockwise encircle elements of (-1 +

*jo*) point. P is the number of poles of G(

*s*) H(

*s*) in right half

*s*plane. The Nyquist stability criterion can be expressed as

Z = N + P

Z = P/N

Z = N - P

Z = PN

⇒ A cycloconverter can be

step down

step up

step down or step up

none of the above

⇒ Fourier transform o the function

*f*(

*t*) = 1 is

2p δ (ω)

p δ (ω)

δ(ω)/2p

δ(ω)/p

⇒ An unmodulated voltage 10

*V*effective is applied to a dioxide detector in which load resistance is 4 x 10

^{-5}ohms. A micrometer shows that the rectified DC current in this resistance is 30

*A*. The efficiency of detection is

0.34

0.555

0.688

0.847

⇒ Two capacitors of 20 μF each are in series. The total capacitance is

5 μF

10 μF

40 μF

400 μF

⇒ Consider the following statements:

- Taking 2's complement is equivalent to sign change.
- In the 2's complement representation the most significant bit (MSB) is zero for a positive number.
- In a 4 bit binary representation of a binary number A, A + 1's complement of A = 2
^{4}.

1 and 2 only

1 and 3 only

2 and 3 only

1, 2 and 3

⇒ In D-type FF, Preset (Pr) and clear (Clr) inputs are called

Synchronous

Asynchronous

Data

None

⇒ In a two stage CE amplifier circuit, the ac collector resistance of the first stage depends on

load resistance

input impedance of first stage

input impedance of second stage

all of the above

⇒ Magnetic deflection is inversely proportional to

voltage

(voltage)

^{0.5}

(voltage)

^{1.5}

(voltage)

^{2}

⇒ In 2's complement representation the number 11100101 represents the decimal number

37

-31

27

-27

⇒ Which one of the following statements regarding DSI is wrong?

It is a digital form of TASI

Though it is more efficient than TASI, it is much slower

A speaker has to wait (it at all) for only a few milliseconds for reallocation of channel

It has increased the capacity of satellite channels by a factor of 2.2 or more with out degrading speech quality

⇒ If two time varying signals of equal magnitudes and 90° phase displacement are applied to X and Y plates of CRO, the display will be

a straight line

a circle

an ellipse

a rectangle

⇒ Which factor determines whether the medium is free space, lossless dielectric, lossy dielectric or good conductor?

Attenuation constant

Constitutive parameters (σ, μ, ε)

Loss tangent

Reflection coefficient

⇒ The response of a function is decided by

the location of its zeros

the location of its poles

both (a) and (b)

none of the above

⇒ The elements which become superconducting at extremely low temperatures are

good conductors at room temperature

ferromagnetic at room temperature

relatively poor conductors at room temperature

insulators at room temperature

⇒ In a varistor the

*v*-

*i*graph is linear.

TRUE

FALSE

⇒ When the

*i*-

*v*curve of a photodiode passes through origin the illumination is

maximum

minimum

zero

equal to rated value

⇒ In a current mirror

the

*i*-

*v*curve of compensating diode is similar to collector curve of transistor

the

*i*-

*v*curve of compensating diode is similar to transconductance curve of transistor

either (a) or (b)

neither (a) nor (b)

⇒ The number FF in hexadecimal system is equivalent to number __________ in decimal system.

256

255

240

239

⇒ A resistance strain gauge is usually

wire grid type

foil type

any of these

none of these

⇒ In the given figure, the combinations of two non touching loop

1

2

3

4

⇒ If γ = (S

_{0}/N

_{0})/(S

_{i}/N

_{m}) where S

_{0}and S

_{1}are signal power output and signal power input and N

_{0}and N

_{m}are noise power output and noise power input, the value of γ for SSB-SC and DSB-SC amplitude modulated system respectively are

1 and 1

1 and 2

2 and 1

0.5 and 0.5

⇒ The log magnitude plot of the given figure is

type 0 system

type 1 system

type 2 system

either type 0 or type 1 system

⇒ The mass of an electron is nearly

9.1 x 10

^{-27}kg

9.1 x 10

^{-29}kg

9.1 x 10

^{-31}kg

9.1 x 10

^{-35}kg

⇒ Which of the following is not a transducer in true sense?

Thermocouple

Piezo electric

Photo electric cell

LCD

⇒ In standing wave pattern on a transmission line

voltage and current nodes coincide

voltage and current antinodes coincide

voltage nodes and current antinodes as well as current nodes and voltage antinodes coincide

both (a) and (b)

⇒ A single phase half wave converter is used to charge a battery of 50 V. The thyristor is continuously fired by dc signal. Input voltage is

*v*= V

_{m}sin ω

*t*. The thyristor will conduct

from 0 to 180°

when

*v*> 50 V

from 0 to 90°

When

*v*< 50 V

⇒ When a material becomes a superconductor, its resistivity becomes

very small

zero

about 10% of normal value

about 20% of normal value