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Q1. | In communication satellites, the up-link normally operates at a higher frequency than the down-link because it |

A. | gives a narrow beam shining into space [Correct Answer] |

B. | results in lesser signal attenuation [Wrong Answer] |

C. | gives better beam-shaping [Wrong Answer] |

D. | is easier to polarize a high frequency beam [Wrong Answer] |

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⇒ To ensure that only dominant TE

_{10}mode propagates in a rectangular waveguide, the operating frequency

must be more than cutoff frequency of

*TE*

_{10}mode

must be less than cutoff frequency of

*TE*

_{20}mode

must be more than cutoff frequency of

*TE*

_{10}mode and less than cutoff frequency of TE

_{20}mode

must be less than cutoff frequency of

*TE*

_{10}mode

⇒ If N = 196, the result of the following program will be

16

16

196

⇒ In a reactance function

all poles are simple

all poles and zeros are simple

all poles and zeros are simple and lie on

*j*ω axis only

all poles and zeros lie on negative real axis

⇒ In a proportional plus integral control action

proportional gain K

*is adjustable but integral time T*

_{p}*is constant*

_{i}proportional gain K

*is adjustable but integral time T*

_{p}*is adjustable*

_{i}both proportional gain K

*and integral time T*

_{p}*are adjustable*

_{i}both proportional gain K

*and integral time T*

_{p}*are constant*

_{i}⇒ The satellites used for intercontinental communication are called

Comsat

Domsat

Marisat

Intelsat

⇒ If two networks are connected in parallel then equivalent

*y*parameter of both is

[

*y*] = [

*y*

_{a}] [

*y*

_{b}]

[

*y*] = [

*y*

_{a}] + [

*y*

_{b}]

[

*y*] = [

*y*

_{a}]/[

*y*

_{b}]

none

⇒ The number of noise sources in a BJT are

3

2

1

4

⇒ The power dissipation in a transistor is the product of

emitter current and emitter to base voltage

emitter current and collector to emitter voltage

collector current and collector to emitter voltage

none of the above

⇒ In a crystal oscillator of the Colpitt's oscillator type, the crystal is put is place of the

resistor R

_{1}

condenser C

_{2}

condenser C

_{1}

inductor L

⇒ The beam of a radar should be

very narrow

very wide

neither too narrow nor very wide

either (

*b*) or (

*c*)

⇒ The inductance of connecting leads can be a source of

low frequency parasitics

high frequency parasitics

carrier frequency parasitics

none of the above

⇒ The counter in the given figur

Mod 3

Mod 6

Mod 8

Mod 7

⇒ For a push pull circuit the most favoured biasing method is

self bias

emitter bias

diode bias

collector bias

⇒ The advantage of using crystal oscillator is that it

requires low d.c. supply voltage

works at high frequency

gives high output voltage

gives constant frequency of oscillations

⇒ The polarities of the magnetised iron rod of

A is N, B is S and C is neutral

A is N, B is S and C is S

A is N, B is N and C is S

A is S, N is S and C is N

⇒ For demodulating PCM; it is first converted into

PDM

PPM

PWM

PAM

⇒ An inductor filter has a ripple that __________ with load resistance and consequently is used only with relatively __________ load currents.

decreases, low

decreases, high

increases, low

increases, high

⇒ In terms of classical representation of electrons

an atom is essentially empty

an atom is essentially full

an atom may be essentially empty or full depending on the material

an atom may be essentially empty or full depending on temperature

⇒ For making a capacitor it is better to have a dielectric having

high permittivity

low permittivity

permittivity same as that of air

permittivity which is neither high nor low

⇒ If F(

*t*) = δ(

*t*-

*a*), F(

*s*)=

0

1

*e*

^{-as}

*e*

^{as}⇒ A ripple counter has propagation delay.

TRUE

FALSE

⇒ The signal input to a given amplifier is made up of 100 mΩ signal power and 1 mΩ noise power. The amplifier contributes an additional 100 mΩ of noise and has a power gain of 20 dB. The output signal-to-noise ratio is

100

50

10

5

⇒ Which one is time invariant system?

*y*[

*n*] =

*x*[2

*n*]

*y*[

*n*] =

*x*[

*n*]

*x*[

*n*- 1]

*y*[

*n*] =

*x*[

*n*/2]

all

⇒ A synchro transmitter receiver unit is a

two phase ac device

3 phase ac device

dc device

1 phase ac device

⇒ -8 is equal to signed binary number

10001000

1000

10000000

11000000

⇒ A line has Z

_{0}= 300 ∠ 0° Ω. If

*Z*

_{L}= 150 ∠ 0° Ω, reflection coefficient is

0.5

0.3333

-0.3333

-0.5

⇒ Work function of oxide coated cathode is much lower than that of tungsten cathode.

TRUE

FALSE

⇒ Consider the following statements about Java variables

- Java variable must start with a letter or underscore or dollor sign.
- Java variable can not start with a digit.
- After the first character the variable can have any combination of letters or numbers.
- Capitalization of letters must be consistent.

All

1, 2 and 3 only

2, 3, 4 only

1, 2 and 4 only

⇒ In a piezoelectric crystal, the application of mechanical force will cause

plastic deformation of crystal

magnetic dipoles in the crystal

electrical polarization in the crystal

shift in Fermi level

⇒ A shift register can be used for all of the following EXCEPT

ring counter

A/D conversion

series to parallel conversion

generation of delay