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Q1. | A transmitter serial current contains |

A. | carrier frequencies [Wrong Answer] |

B. | audio frequencies [Wrong Answer] |

C. | radio frequencies [Correct Answer] |

D. | none of the above [Wrong Answer] |

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Explanation:-
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**Also Read Similar Questions Below :**

⇒ In case of probability of the message is 1 to 16 then the information will be

16 bits

8 bits

4 bits

2 bits

⇒ If

*q*is charge on an electron, R is radius of electron orbit and ω is angular velocity of electron rotation, the magnetic dipole moment of electron in orbit is

0.5

*q*ωR

0.5

*q*

^{2}ω

^{2}R

^{2}

0.5

*q*ωR

^{2}

0.5

*q*ω

^{2}R

⇒ As the number SWG increases, area of cross-section decreases.

TRUE

FALSE

⇒ An ac tachometer has a drag cup construction so that

rotor inertia is low

rotor body is conducting

rotor is easy to fabricate

both (a) and (b)

⇒ In a minimum phase system

all poles lie in the left half plane

all zeros lie in the left half plane

all poles lie in the right half plane

all except one pole or zero lie in the left half plane

⇒ The voltage of single phase supply to residential consumers in India is

400 V

230 V

2.2 kV

11 kV

⇒ In a purely inductive ac circuit, the supply voltage and voltage induced across inductance are equal and opposite at all instants.

TRUE

FALSE

⇒ When

*x*(

*n*) is real then the Fourier series coefficients are correlated as __________ .

*a*

_{-k}=

*a*

_{k}^{*}

*a*

*=*

_{k}*a*

*k*

^{*}

*a*

_{k+1}=

*a*

_{k}_{*}

*a*

_{-k+1}=

*a*

_{k}^{*}

⇒ Which of the following does not cause losses in optical fibre cables?

Impurities

Microbending

Attenuation in glass

Stepped index operation

⇒ Which of the following is not a characteristic of a flip flop?

It is a bistable device

It has two outputs

It has two outputs are complement of each other

It has one input terminal

⇒ In waveguides the existing waves are

TE only

TM only

both (a) and (b)

all of the above

⇒ The effective length of an 1/2 antenna (Given R

_{r}= 73 Ω and (A

_{e})

_{max}= 0.34λ

^{2}and η = 120p) is __________ .

0.6348 λ

0.5133 λ

0.1587 λ

0.3714 λ

⇒ The circuit shown in the figure has 4 boxes each described by inputs P, Q, R and outputs Y, Z

4 bit adder giving P + Q

4 bit subtractor giving P - Q

4 bit subtractor giving Q - P

4 bit adder giving P + Q + R

⇒ In the circuit shown in the given figure, R

_{L}will absorb maximum power when its valu

2.75 Ω

7.5 Ω

25 Ω

27 Ω

⇒ In an RC series circuit R = 100 Ω and X

_{C}= 10 Ω. In this circuit

the current and voltage are in phase

the current leads the voltage by about 6°

the current leads the voltage by about 84°

the current lags the voltage by about 6°

⇒ 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

⇒ Which of following digital modulation technique?

ASK

FSK

PSK

All

⇒ The approximate value of input impedance of a common emitter amplifier with emitter resistance R

_{e}is given by

*h*

_{ie}+ A

_{I}R

_{e}

*h*

_{ie}+ (

*i*+

*h*

_{fe}) R

_{e}

*h*

_{ie}

(1 +

*h*

_{fe}) R

_{e}

⇒ The spectral component of noise associated with

*k*

^{th}frequency is given, in the limit as Δ

*f*→ 0 by

*n*(

_{k}*t*) written as

*n*(

_{k}*t*) = C

_{k}cos (2p

*k*Δ

*ft*+ θ

_{k1, 2 only1, 3 only1, 2, 32, 3 only}

⇒ The number of distinct Boolean expressions of 3 variables is

8

256

64

7

⇒ Directive gain is

a power ratio

a voltage ratio

a current ratio

a distance ratio

⇒ Consider the following as regards cumulative disribution function F(

*x*)

- 0 ≤ F(
*x*) ≤ 1 - F(- ∞) = 0
- F(∞) = 1
- F(
*x*_{1}) ≤ F(*x*_{2}) If*x*_{1}<*x*_{2}

1 and 2 only

1, 2 and 3 only

1, 2, 3 and 4

2 and 4

⇒ In a loss line R

_{L}< Z

_{0}, then

Reflection coefficient is zero

Reflection coefficient is ∞

Reflection coefficient is negative

Reflection coefficient is positive

⇒ The zeros of a minimum phase function lie on

imaginary axis

left half plane or origin

left half plane or imaginary axis

right half plane or origin

⇒ In the design of a single mode step index optical fiber close to upper cut-off, the single mode operations is NOT preserved if

radius as well as operating wavelength are halved

radius as well as operating wavelength are doubled

radius is halved and operating wavelength is doubled

radius is doubled and operating wavelength is halved

⇒ Padders are used in a receiver to

discard the carrier

facilitate tracking

filter the input signal

suppress noise

⇒ A photo diode is

forward biased

reverse biased

either forward or reverse biased

unbiased

⇒ For the transport lag G(

*j*ω) =

*e*

^{-jωT}, the magnitude is always equal to

0

1

10

0.5

⇒ In a P type silicon sample, the hole concentration is 2.25 x 10

^{15}/ cm

^{3}. If the intrinsic carrier concentration is 1.5 x 10

^{10}/ cm

^{3}the electron concentration is

zero

10

^{10}/cm

^{3}

10

^{5}/cm

^{3}

1.5 x 10

^{25}/cm

^{3}

⇒ Use of high permeability core in moving iron instrument helps in

reducing size of meter

increasing sensitivity

reducing temperature error

all of the above