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Q1. | 24 telephone channels are frequency division multiplexed using an SSB modulation. Assuming 3 kHz per channel, the required band width is |

A. | 8 kHz [Wrong Answer] |

B. | 27 kHz [Wrong Answer] |

C. | 21 kHz [Wrong Answer] |

D. | 72 kHz [Correct Answer] |

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Explanation:-
Answer : DDiscuss 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 :**

⇒ For the circuit shown in the figure, the time constant RC = 1 ms. The input voltage is V

_{1}(

*t*) = 2 sin 10

^{3}

*t*. The output voltage V

_{0}(

*t*) is equa

sin (10

^{3}

*t*- 45°)

sin (10

^{3}

*t*+ 45°)

sin (10

^{3}

*t*- 53°)

sin (10

^{3}

*t*+ 53°)

⇒ Microprocessor 386SX is a 16/32 bit microprocessor. It has

16 bit registers and 32 bit data bus

16 bit registers and 16 bit data bus

32 bit registers and 32 bit data bus

32 bit register and 16 bit data bus

⇒ Consider the following statements

- Dissipative attenuator has a fixed value of attenuation.
- Reflective attenuator has a fixed value of attenuation.
- Both dissipative and reflective attenuators are available only with fixed attenuation.
- Both dissipative and reflective attenuators are available with either fixed or variable attenuation.

1 only

1 and 2

1, 2 and 3

4 only

⇒ When an alternating current passes through an ohmic resistance the electrical power converted into heat is

apparent power

true power

reactive power

none of the above

⇒ Which of the following is a valid variable in FORTRAN 77?

0.125

ALPHA -3

ALPHA 3

BALPHAC

⇒ The entries in the first column of Routh array of a fourth order are 5, 2, - 0.1, 2, 1. The number of poles in the right half plane are

1

2

3

4

⇒ An R-L series circuit is excited by a voltage

*v*(

*t*). The circuit was initially relaxed. Which of the following sources of

*v*(

*t*) would cause maximum current at

*t*= 0

^{+}?

unit step

unit impulse

unit ramp

unit step plus unit ramp

⇒ The derating factor for a BJT transistor is about

0.5 mW/°C

2.5 mW/°C

10 mW/°C

25 mW/°C

⇒ Highest value of autocorrelation function 100 sin 50 p

*t*is

50

zero

100

100/p

⇒ The output of a Piezoelectric crystal has

low amplitude and low impedance

high amplitude and low impedance

low amplitude and high impedance

high amplitude and high impedance

⇒ For maximum unclipped output from a CE amplifier, the Q point should be

at the centre of dc load line

at the centre of ac load line

at the centre of collector current

none of the above

⇒ A Hall effect transducer has K

_{H}= - 1 x 10

^{-8}. If B = 1 Wb/m

^{2}, I = 3 A and bismuth slab is 2 mm wide, the Hall voltage is

-7.5 x 10

^{-6}V

-15 x 10

^{-6}

-20 x 10

^{-4}V

-22.5 x 10

^{-4}V

⇒ The commonly employed filter in SSB generation is

high pass filter

RC filter

LC filter

mechanical filter

⇒ When satellite radio beam is aimed towards earth, it illuminates on the earth for an oval shaped area called

foot print

beam area

satellite service area

radiated area

⇒ In which of the following instructions of 8085 are the contents of accumulator complemented?

`STC`

`CMC`

`CMA`

`RAL`

⇒ If the changes in zener current in a voltage regulator circuit are too large, it can be corrected by using a

emitter follower

CE amplifier

capacitor

either (a) or (b)

⇒ For the Infix expression A + B - C + D the Postfix notation is

AB + C - D +

+ AB - C + D

AB - C + D

None of the above

⇒ The amplifier circuit shown below uses a silicon transistor. The capacitors C

_{c}and C

_{E}can be assumed to be short at signal frequency and the effect of output resistance

*r*

_{0}can be ignored. If C

_{E}is disconnected from the circuit, which one of the following statements is T

The input resistance R

_{i}increases and the magnitude of voltage gain A

_{v}decreases

The input resistance R

_{i}decreases and the magnitude of voltage gain A

_{v}decreases

Both input resistance R

_{i}and the magnitude of voltage gain A

_{v}decrease

Both input resistance R

_{i}and the magnitude of voltage gain A

_{v}increase

⇒ The colour coding of a resistors shows 100 K, ± 10%. When the resistance was measured with an ohmmeter, it read

95 K

80 K

120 K

85 K

⇒ In 8355, the ROM is organized as __________ words of 8 bits each.

2000

2048

8355

835

⇒ In synchronous detection of an AM signal

Carrier is completely suppressed

Both side hands are suppressed

Only one side band and part of carrier is suppressed

One side band and full carrier is suppressed

⇒ Nickel is a non-magnetic material.

TRUE

FALSE

⇒ IC counters are

synchronous only

asynchronous only

both synchronous and asynchronous

none of the above

⇒ MOSFET can be used as a

current controlled capacitor

voltage controlled capacitor

current controlled inductor

voltage controlled inductor

⇒ In

*n*channel JFET

I

_{D}and V

_{DS}are positive but V

_{GS}is negative

I

_{D}and V

_{GS}are positive but V

_{DS}is negative

V

_{DS}and V

_{GS}are positive but I

_{D}is negative

I

_{D}, V

_{DS}and V

_{GS}are all positive

⇒ In an amplifier the stray capacitances assume impedance at low frequencies

TRUE

FALSE

⇒ If two mutually exclusive events A and B can happen in

*m*and

*n*ways, then either

*A*or

*B*can happen in (

*m*+

*n*) ways.

TRUE

FALSE

⇒ At a particular time it is observed that the frequencies of F layer at Delhi is 3 MHz the maximum electron density is

11 x 10

^{10}

1.1 x 10

^{10}

0.11 x 10

^{10}

11 x 10

^{12}

⇒

Match the following:

List I (Operator) | List II (Description) | ||
---|---|---|---|

A. | & & | 1. | Assignment |

B. | | | | 2. | Logical AND |

C. | = | 3. | Logical OR |

A-1, B-2, C-3

A-2, B-3, C-1

A-3, B-2, C-1

A-1, B-3, C-2

⇒ The given figure shows three Nyquist plots of G(

*s*) H(

*s*) =

*e*/[

^{-sT}*s*(

*s*+ 1)] for different values of T. The curves 1, 2, 3 ca

for T = 0, 0.5 and 1 respectively

for T = 1, 0.5 and 0 respectively

for T = 0.5, 1 and 0 respectively

for T = 0, 1 and 0.5 respectively