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Q1. | In binary data transmission DPSK is preferred to PSK because |

A. | a coherent carrier is not required to the generated at the receiver [Correct Answer] |

B. | for a given energy per bit, the probability for zero is less [Wrong Answer] |

C. | the 180° phase shifts of the carrier [Wrong Answer] |

D. | more protection is provided against impulse noise [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 :**

⇒ The number of logic or arithmetic operations with

`ALU 1C 74181`

can carry out is4

8

16

32

⇒ Varactor diode is forward biased when it is used.

TRUE

FALSE

⇒ A dual trace CRO has

one electron gun

two electron guns

one electron gun with one two pole switch

two electron guns with one two pole switch

⇒ When the light falling on a photodiode increases, the reverse minority current

increases

increases or decreases

decreases

remains the same

⇒ A function Z(

*s*) has zero at infinity if

the degree of numerator and denominator are equal

the numerator of Z(

*s*) is one degree higher than denominator

the denominator of Z(

*s*) is one degree higher than numerator

the degree of numerator and denominator are either equal or differ by one

⇒ Which of the following antennas is circularly polarized?

Yagi-Uda

Parabolic reflector

Small circular loop

Helical

⇒ The mean free path of conduction electrons in copper is about 4 x 10

^{-8}m. For a copper block, find the electric field which can give, on an average, 1 eV energy to a conduction electron

2.62 x 10

^{7}V/m

2.64 x 10

^{7}V/m

2.5 x 10

^{7}V/m

2.58 x 10

^{7}V/m

⇒ The log magnitude for the system in the given figure is (where T =

20 log (1 + ωT)

-20 log (1 + ωT)

-10 log (1 + ω

^{2}T

^{2})

-20 log (1 + ω

^{2}T

^{2})

⇒ The rate of change of excess carrier density is proportional to carrier density.

TRUE

FALSE

⇒ The transfer function of a controller is given as K

_{p}+ K

_{d}.

*s*where K

_{p}and K

_{d}are constants. What type of controller is this?

Proportional

Proportional plus integral

Proportional plus derivative

Integral plus derivative

⇒ In satellite communication, highly directional antennas are used to

direct the spot beam to a particular region of space on Earth

strengthen the beam to overcome the cosmic noise

make corrections in change of polarisation of the beam

select a particular channel in transmission and reception

⇒ Consider the following statements as regards communication receiver

- Variable sensitivity is used to eliminate selective fading
- A product demodulator can be used to receive Morse code
- The noise limiter cuts off receiver output during a noise pulse
- Double conversion is used to improve image rejection

1, 2, 3, 4

1, 2, 3

2, 3, 4

1, 3, 4

⇒ The ability of a radio receiver to discriminate between different input signals and to accept only one definite signal is called its

sensitivity

attenuation

selectivity

modulation

⇒ Mobility is directly proportional to Hall coefficient.

TRUE

FALSE

⇒ The circuit in figur

Cauer I form

Foster I form

Cauer II form

Foster II form

⇒ Thermal noise is independent of

temperature

bandwidth

centre frequency

Boltzmann constant

⇒ In a JK flip-flop, J is connected to Q and K is connected to Q outputs. The JK FF converts into a

RS FF

D FF

T FF

Clocked RS FF

⇒ Complex pole in z-plane is as shown below. This is the pole diagram for ________

Decaying sinusoidal sequence

Growing sinusoidal sequence

Decaying non sinusoidal sequence

Growing non sinusoidal sequence

⇒ The p mode of operation of magnetron signifies that

the phase difference between adjacent anode poles is p radians

the phase difference between adjacent anode poles is a multiple of p radians

the total phase shift around the periphery is p radians

none of the above

⇒ Which is not a software?

DOS

Windows

MS WORD

Hard disk

⇒ In figure, V reads 45V. Then

10.1 A

13.3 A

16.1 A

19.4 A

⇒ The minimum decimal equivalent of the number 11C0 is

183

194

268

269

⇒ In which of the following device electrons will be the majority carriers?

P-type semiconductor

N-type semiconductor

N-P-N transistor

P-N-P transistor

⇒ For matching over a range of frequencies in a transmission line it is best to use

a balun

a broad band directional coupler

double stub

a single stub of adjustable position

⇒ For an P-N-P transistor in normal operation its junction are biased as

emitter base : reverse, collector base : forward

emitter base : forward, collector base : reverse

emitter base : forward, collector base : forward

emitter base : reverse, collector base : reverse

⇒ Consider the circuit shown below of 2 : 1 MUX is given by the function

*g*=

*ac*+

*bc*

X ⊕ Y

XY + EXY

XE + XY

none of these

X ⊕ Y

XY + EXY

XE + XY

none of these

⇒ When two

the carry out of first stage is connected to carry in of second stage

the carry in of first stage connected to carry in of second stage

the carry in of first stage is connected to carry out of second stage

the carry out of first stage is connected to carry out of second stage

⇒ Open-circuit voltage is the potential difference between two point when the impedance between these points is

zero

infinity

capacitive

reactive

⇒ The expression given is F(A, B, C, D, E, F, G, H) = Σ(33, 48, 102, 158, 222, 229, 233, 243, 255); then the __________ and __________ minterms are grouped together into dual and variable __________ is reduced using the dual

243, 233, D

222, 158, B

243, 255, A

229, 243, E

⇒ The oscillator shown in figure

Clapp oscillator

R-C Phase shift oscillator

Hartley oscillator

Colpitt's oscillator

⇒ When two

`ALU 1C 74181`

are cascadedthe carry out of first stage is connected to carry in of second stage

the carry in of first stage connected to carry in of second stage

the carry in of first stage is connected to carry out of second stage

the carry out of first stage is connected to carry out of second stage

⇒ Open-circuit voltage is the potential difference between two point when the impedance between these points is

zero

infinity

capacitive

reactive

⇒ The expression given is F(A, B, C, D, E, F, G, H) = Σ(33, 48, 102, 158, 222, 229, 233, 243, 255); then the __________ and __________ minterms are grouped together into dual and variable __________ is reduced using the dual

243, 233, D

222, 158, B

243, 255, A

229, 243, E

⇒ The oscillator shown in figure

Clapp oscillator

R-C Phase shift oscillator

Hartley oscillator

Colpitt's oscillator