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Q1. | A pre-emphasis circuit provides extra noise immunity by |

A. | converting the phase modulation of FM [Wrong Answer] |

B. | preamplifying the whole audio band [Wrong Answer] |

C. | amplifying the higher audio frequencies [Correct Answer] |

D. | boosting the pass frequencies [Wrong Answer] |

View Answer
Explanation:-
Answer : CDiscuss 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 figure, the tree branches are

*bdf*. The fundamental loops inc

*abc*,

*def*,

*bdea*

*cea*,

*bdea*,

*abc*

*cdb*,

*def*,

*bfa*

*abde*,

*def*,

*cdb*

⇒ For most metals, Fermi level E

_{F}is less than

0.1 eV

2 eV

5 eV

10 eV

⇒ In

*h*parameter representation, the independent variables are

I

_{1}and V

_{2}

I

_{2}and V

_{1}

V

_{1}and V

_{2}

I

_{1}and I

_{2}

⇒ The voltage transfer functions of two port circuits connected in cascade can be easily found from

product of individual ABCD matrices

product of voltage transfer functions of two networks

sum of

*z*matrices

sum of

*h*matrices

⇒ As per time displacement theorem in Laplace transformation, displacement in the time domain by T becomes

division by s in the

*s*domain

division by

*e*

^{-sT}in the

*s*domain

multiplication by

*s*in the

*s*domain

multiplication by

*e*

^{-sT}in the

*s*domain

⇒ The number of address lines in EPROM 4096 x 8 is

2

4

8

12

⇒ The decimal equivalent of the hexadecimal number E 5 is

279

229

327

0

⇒ In VHS format the width of tape is

2"

1"

1/2"

1/4"

⇒ Which materials find application in MASER?

Diamagnetic

Paramagnetic

Ferromagnetic

Ferrimagnetic

⇒ In a varactor diode the increase in width of depletion layer results in

decrease in capacitance

increase in capacitance

no change in capacitance

either (a) or (b)

⇒ A periodic voltage has following values for equal time intervals changing suddenly from one value to next : 0, 5, 10, 20, 50, 60, 50, 20, 10, 5, 0, - 5, - 10

31

*v*

32

*v*

insufficient data

none of these

⇒ Consider the following statements in amplitude modulation

- The harmonic and intermodulation distortion may occur in audio and RF amplifiers
- The sum and difference frequencies are present in the output of mixer
- The diode detector has audio frequencies in its output
- A balanced modulator cannot produce an AM with suppressed carrier

1, 2, 3, 4

1, 2, 3

1, 2

3, 4

⇒ For a Mod 64 parallel counter we need

6 flip flops

6 flip flops and 2 AND gates

6 flip flops and 4 AND gates

none of the above

⇒ Which of the following is a balanced line?

Coaxial line

Strip line

Microstrip line

TV twin lead

⇒ An RC oscillator uses

one RC combination

two RC combinations

at least three RC combinations

either (a) or (b)

⇒ In a Communication system, noise is most likely to affect the signal.

at the transmitter

In the channel

in Information source

at the destination

⇒ A resistance and an inductance are connected in parallel and fed from 50 Hz ac mains. Each branch takes a current of 5 A. The current supplied by source is

0.416666666666667

7.07 A

0.208333333333333

zero

⇒ A two-input OR gate is designed for positive logic. However, it is operated with negative logic. The resulting logic operation will then be

OR

AND

NOR

EX-OR

⇒ For pole-zero plot shown, the system is ________

minimum phase

maximum phase

mixed phase

none of these

⇒ The circuit of the figure is an example of feedback of the following

current series

current shunt

voltage series

voltage shunt

⇒ For a NOR SR latch the normal resting state of inputs is

S = R = 1

S = 0, R = 1

S = 0, R = 0

S = 1, R = 0

⇒ Special circuits using neon tubes, contact relays and capacitors are used in many domestic appliances. The role of capacitor in figure i

reduce power loss

function as resistor when relay is on

delay the operation of the contact relay after switching on

open circuit the relay terminals

⇒ Which camera tube has highest dark current?

Plumbicon

Vidicon

Saticon

GCD imager

⇒ The frequency of oscillation in a backward wave oscillator can be changed by

varying the voltage which controls beam velocity

varying the beam current

both by varying the beam current and by light varying the voltage which controls beam velocity

changing the rate of thermionic emission

⇒ In 8085 microprocessor, which of the following interrupts has the highest priority?

RST 5.5

RST 7.5

TRAP

INTR

⇒ Waveguides are generally used above

20 MHz

100 MHz

200 MHz

1000 MHz

⇒ Klystron amplifier is not used to amplifier very weak microwave signals due to

low gain for weak signals

low noise for weak signals

high noise

both (a) and (b)

⇒ The rotation of direction of E field of a linearly polarized wave passing through a magnetised ferric medium is called

Lorentz rotation

Faraday rotation

Steinmitz rotation

Fleming's rotation

⇒ For the circuit, let us assume that R = 1 Ω, L = 10

^{-3}H, and V(t) = 10 cos (1000

*t*+ 30°)V and the differential equation for I(

*t*) is give

7.07 cos (1000

*t*+ 15°) A

70.7 cos (1000

*t*- 30°) A

7.07 cos (1000

*t*- 15°) A

7.07 cos (1000

*t*+ 15°) A

⇒ The analog signal given below is sampled by 600 samples per second for

*m*(

*t*) = 3 sin 500 p

*t*+ 2 sin 700 p

*t*then folding frequency is

500 Hz

700 Hz

300 Hz

1400 Hz