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Q1. | Consider the following stateme |

A. | 1 and 2 only [Wrong Answer] |

B. | 3 and 4 only [Wrong Answer] |

C. | 1, 2 and 3 [Correct Answer] |

D. | 2, 3 and 4 [Wrong Answer] |

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Explanation:-
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⇒ Long distance short wave radio broadcasting based on

line of sight

ionospheric wave

ground wave

skywave

⇒ An air gap provided in the iron core of an inductor prevents

flux leakage

hysteresis loss

core saturation

heat generation

⇒ In a multicavity klystron amplifier the signal to be amplified develops an ac voltage of signal frequency across the gap in buncher cavity

TRUE

FALSE

⇒ The function H (

*s*) is positive real if

H (

*s*) has no poles or zeros in right half plane

The poles of H(

*s*) on the imaginary axis are simple with real and positive residues

Re [H(

*jω*)] ≥ 0 for 0 ≤ ω ≤ ∞

all of the above

⇒ The main advantage of TWT over klystron is

higher bandwidth

higher gain

higher frequency

higher output

⇒ In figure, the transmission parameters are A = C = 1, B = 2 and D = 3. Then Z

_{in12/13 Ω13/12 Ω3 Ω4 Ω}

⇒ Which class of amplifiers operates with least distortion?

Class A

Class B

Class C

Class AB

⇒ The temperature at which some materials become superconductors is called

Transition temperature

Curie temperature

Neel temperature

Onnes temperature

⇒ In a 4 bit weighted resistor D/A converter, resistor value corresponding to LSB is 32 k ohm. The resistor value corresponding to MSB is

32 k ohm

16 k ohm

8 k ohm

4 k ohm

⇒ In a bipolar transistor, the emitter base junction has

forward bias

reverse bias

zero bias

zero or reverse bias

⇒ In a broadcast superheterodynes receiver having no RF amplifier, the loaded Q of the antenna coupling circuit is 100. If the intermediate frequency is 455 kHz. The rejection ratio at 25 MHz will be

1.116

1.386

2.116

2.386

⇒ Which control action is also called rate control?

Proportional

Derivative

Integral

Proportional plus integral

⇒ In figure the output

*v*(

*t*)

phase modulated signal

amplitude modulated signal

frequency modulated signal

none of the above

⇒ A pre-emphasis circuit provides extra noise immunity by

converting the phase modulation to frequency modulation

pre-amplifying the whole audio band

boosting the base frequencies

amplifying the higher audio frequencies

⇒ A 12 bit ADC is operating with 1 μs clock period. Total conversion time is 14 μs. ADC is

flash type

counting type

integrating type

successive approximation type

⇒ For a transfer function the coefficients of the numerator and denominator polynomials in s must be real.

TRUE

FALSE

⇒ For a good public address system the sound intensity at the farthest point should be at least

20 dB over threshold of hearing

40 dB over threshold of hearing

80 dB over threshold of hearing

120 dB over threshold of hearing

⇒ In FORTRAN 77 FLOAT (-28) gives the value

28

-28

-28

none of the above

⇒ In a circular waveguide with radius

*r*, the dominant mode is

TM

_{01}

TE

_{01}

TM

_{11}

TE

_{11}

⇒ If velocity of sound waves in air at 0°C is 330 m/s, the velocity at 40°C is about

330 m/s

334 m/s

353 m/s

380 m/s

⇒ Which of the following is not a valid arithmetic statement in C?

*x*=

*x*+ 1

*x*=

*y*

^{*}

*z*

*x*

^{*}

*y*=

*z*

*z*=

*y*/

*x*

⇒ The intrinsic carrier concentration of silicon sample at 300 K is 1.5 x 10

^{16}/m

^{3}. If after doping, the number of majority carriers is 5 x 10

^{20}/m

^{3}. The minority carrier density is

4.5 x 10

^{11}/m

^{3}

3.33 x 10

^{4}/m

^{3}

5 x 10

^{20}/m

^{3}

3 x 10

^{-5}/m

^{3}

⇒ In an SSB transmitter one is most likely to find

class C audio amplifier

tuned modulator

class B RF amplifier

class AB power amplifier

⇒ Wave A = 100 sin ω

*t*and wave B = 100 cos ω

*t*. Then

rms values of the two waves are equal

rms values of A is more than that of B

rms values of A is less than that of B

rms values of the two waves may or may not be equal

⇒ In measuring a resistance by voltmeter-ammeter method, the voltmeter can be connected either across supply or across the resistance. If the resistance is low, the voltmeters should be connected

across the supply

across the resistance

either in two positions

preferably across the supply

⇒ All other parameters remaining the same, a 3 phase bridge inverter with 180° mode of operation

has the same peak thyristor current as in 120° mode of operation

has higher peak thyristor current than in 120° mode of operation

has lower peak thyristor current than in 120° mode of operation

any of the above

⇒ A current of 3.25 A is flowing through a resistance of 34.98 Ω. The voltage drop across resistance to the appropriate number of significant figures is

113.685 V

113.68 V

113.6 V

114 V

⇒ The signal plate of vidicon tube is coated with tin oxide.

TRUE

FALSE

⇒ Consider the following statemen

1, 2, 3, 4

1, 2, 3

1, 2

1, 3, 4

⇒ The orbital period of a geostationary communication satellite is

12 hours

24 hours

36 hours

48 hours