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Q1. | An AM signal and a narrowband FM signal with identical carriers, modulating signals and modulation index of 0.1 are added together. The resultant signal can be closely approximated by |

A. | Broadband FM [Wrong Answer] |

B. | SSB with carrier [Correct Answer] |

C. | DSB-SC [Wrong Answer] |

D. | SSB without carrier [Wrong Answer] |

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

⇒ Magnetic flux density has the dimensions

MI

^{-1}T

^{-2}

M

^{-1}I

^{-2}T

^{-2}

ML

^{-3}T

^{-2}

MI

^{-1}T

^{-3}

⇒ Which of the following impedance inversion is obtained?

Short-circuited stub

A quarter wave line

Balun transformer

A half wave line

⇒ The common emitter short circuit current gain β of a transistor

is a monotonically increasing function of the collector current I

_{c}

is a monotonically decreasing function of I

_{c}

increasing with I

_{c}, for low I

_{c}, reaches a maximum and then decreases with further increase in I

_{c}

is not a function of I

_{c}

⇒ The 2's complement representation of - 17 is

1110

1111

11110

10001

⇒ For Bode plot of (1 +

*j*ωT) has

slope of 20 dB/decade and phase angle + tan

^{-1}(ωT)

slope of - 20 dB/decade and phase angle + tan

^{-1}(ωT)

slope of 20 dB/decade and phase angle - tan

^{-1}(ωT)

slope of - 40 dB/decade and phase angle - tan

^{-1}(ωT)

⇒ The noise sources shot noise, partition noise and thermal noise are associated with which component

BJT

diode

resistor

capacitor

⇒ Which of the following READ statements is correct in FORTRAN 77?

`READ *, HONEY (I), I = 1, 5 `

`READ *, (HONEY (I), I = 1, 5)`

`READ * HONEY I, I = 1, 5`

`READ HONEY I, I = 1, 5`

⇒ A variable reluctance tachometer has 180 teeth on rotor. The speed of shaft on which it is mounted in 1200 rpm. The frequency of output pulses is

1800 per second

3600 per second

4800 per second

5600 per second

⇒ In a series resonant circuit, the resonant frequency is

geometric mean of half power frequencies

arithmetic mean of half power frequencies

difference of half power frequencies

none of the above

⇒ Space wave may be a direct wave or wave reflected from earth.

TRUE

FALSE

⇒ In a Ballistic galvanometer

inertia is small and damping is also small

inertia is large and damping is critical

inertia is large and damping is small

both inertia and damping are large

⇒ When a P-N junction is unbiased, the junction current at equilibrium is

zero as no charges cross the junction

zero as equal number of carriers cross the barrier

mainly due to diffusion of majority carriers

mainly due to diffusion of minority carriers

⇒ Pick the odd-one out

Hartley Oscillator

Colpitt oscillator

Clapp oscillator

Weinbridge oscillator

⇒ Maximum usable frequency is [

*f*

_{muf}]

*f*sec

_{c}*i*

*f*cos

_{c}*i*

*f*sin

_{c}*i*

*f*sec

_{c}*i*

⇒

*i*

_{1}(

*t*) for

*t*> 0 is give

2.5 - 2.5

*e*

^{-2t}

2.5 - 1.25

*e*

^{-2t}

1.25 - 1.25

*e*

^{-2t}

None of these

⇒ If reflection coefficient is 1/5, then corresponding VSWR is given by

1

2

3

42796

⇒ In a N-P-N transistor the function of the emitter is

to emit or inject holes into the collector

to emit or inject electrons into the collector

to emit or inject electrons into the base

to emit or inject holes into the base

⇒ 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)

⇒ A NAND gate has 3 inputs and one output. The number of thyristors required for this gate are

1

2

3

3 or 4

⇒ The chip 8257 is a

programmable interrupt controller

programmable DMA controller

programmable peripheral interface

none of the above

⇒ In a CE amplifier, the collector resistance is 6 kΩ and load resistance is 3 kΩ. The ac load resistance is

9 kΩ

6 kΩ

3 kΩ

2 kΩ

⇒ RTD is generally suitable for temperature up to

about 800°C

about 1500°C

about 200°C

about 50°C

⇒ For the switch circuit, taking open as 0 and closed as 1, the expression for the circuit is Y. Y is give

A + (B + C) D

A + BC + D

A(BC + D)

none of these

⇒ The scale of PMMC instrument is linear.

TRUE

FALSE

⇒ The open loop frequency response of a unity feed back system is as u

20 dB and 15°

20 dB and 25°

6 dB and 15°

6 dB and 25°

⇒ 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}⇒ Which one of the following statements is not a property of RL driving point impedance?

The first critical frequency at the origin is a zero

The last critical frequency is a pole

The impedance at S = ∞ always less than the impedance at S = zero

The slope of the impedance curve is positive at all points

⇒ Which of the following is used to provide tracking between RF amplifier and local oscillator stages of receiver?

Variable tuning inductor

Ganged tuning inductor

Variable capacitor

Variable preset

⇒ One of the function of the Sio

_{2}layer in an IC is to

act as a dielectric for capacitors

prevent shorting of elements by interconnections

from cathodes for diodes

afford protection from the radiations

⇒ In frequency modulation noise can be further reduced by

increasing deviation

reducing deviation

reducing carrier frequency

increasing signal amplitude