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Q1. | For FM, which of the following statement is not true? |

A. | The bandwidth increases as modulation index is increased [Wrong Answer] |

B. | The total power remains constant with respect to modulation index [Wrong Answer] |

C. | The carrier never becomes zero [Correct Answer] |

D. | All of the above [Wrong Answer] |

View Answer
Explanation:-
Answer : CDiscuss 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 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

⇒ The most commonly used magnetron is

cylindrical

parallel plate

inclined plate

flat plate

⇒ Reception through space wave is limited to line of sight distance.

TRUE

FALSE

⇒ The accuracy of measurement by ohmmeter is very good.

TRUE

FALSE

⇒ The main drawback in the performance of shunt peaked wide band amplifier is

two low gain at low frequency

poor phase response

reduce frequency at middle frequency

that the maximum gain of the stage is small

⇒ The electromagnets of an induction wattmeter

are laminated

are not laminated

may be laminated

must not be laminated

⇒ In orthogonal BFSK, the energy of information bearing term is

the same as total transmitted energy

one-half of total transmitted energy

one-fourth of total transmitted energy

none of the above

⇒ A parametric amplifier uses

non linear resistance

non linear reactance

either (a) or (b)

neither (a) nor (b)

⇒ The function in the given figure can be writte

*u*(

*t*- 1) sin p (

*t*- 1) -

*u*(

*t*- 3) sin p (

*t*- 3) +

*u*(

*t*- 4) sin p (

*t*- 4) -

*u*(

*t*- 6) sin p (

*t*- 6)

*u*(

*t*- 1) sin p (

*t*- 1) -

*u*(

*t*- 3) sin p (

*t*- 3) +

*u*(

*t*- 4) sin p (

*t*- 4)

*u*(

*t*- 1) sin p (

*t*- 1) +

*u*(

*t*- 4) sin p (

*t*- 4)

*u*(

*t*- 1) sin 2p (

*t*- 1) +

*u*(

*t*- 4) sin 2p (

*t*- 4)

⇒ A signal

*m*(

*t*) with bandwidth 500 Hz is first multiplied by a signal

*g*(

*t*) w

δ(

*t*)

*m*(

*t*)

0

*m*(

*t*) δ(

*t*)

⇒ Two coupled coils have self inductance L

_{1}and L

_{2}. The coefficients of coupling is

*k*. The mutual inductance is

*k*L

_{1}L

_{2}

*k*

^{2}L

_{1}L

_{2}

*k*L

_{1}L

_{2}

*k*L

_{1}L

_{2}

⇒ The reactance of bypass capacitor in a CE amplifier circuit should be

equal to the resistance in parallel with it

equal to 10% or less of the resistance in parallel with it

equal to 50% of the resistance in parallel with it

independent of the resistance in parallel with it

⇒ Which of the following parameters is negligible in transmission lines?

R

L

C

G

⇒ The conduction band is

same as forbidden energy gap

generally located on the top of the crystal

generally located on the bottom of the crystal

a range of energies corresponding to the energies of the free electrons

⇒ A real number consists of

integer part

integer part and fraction part

integer part, fraction part along with positive or negative sign

none of the above

⇒ A current 10 sin (200

*t*) A flows through a 5 mH inductance. The expression for voltage is

10 sin (200

*t*+ 90°)

10 sin (200

*t*- 90°)

10 sin(1000

*t*+ 90°)

10 sin (1000

*t*- 90°)

⇒ The radiation pattern of loop antenna is

circle

semicircle

elliptical

cardoid or Limacon

⇒ A 1 kHz sinusoidal signal is ideally sampled at 1500 samples/sec and the sampled signal is passed through an ideal low pass filter with cut off frequency 800 Hz. The output signal has the frequency.

0 Hz

0.75 kHz

0.5 kHz

0.25 kHz

⇒ If I = J = K = 13, then in Fortran 1 = 10 - (1 / 10) * 10 + (J / 5) * 4 + K ** (- 2) is equal to

8

7

6

5

⇒

Match the following:

List I (Diode Rectifier) | List II (Efficiency is R_{f}/R_{L} = 0.25) | ||
---|---|---|---|

A. | Half wave | 1. | 0.54 |

B. | Bridge Rectifier | 2. | 0.65 |

C. | Full wave using tapped centre transformer | 3. | 0.325 |

A-1, B-2, C-3

A-2, B-1, C-3

A-3, B-2, C-1

A-3, B-1, C-2

⇒ If

*r*

_{e}is ac resistance of diode, the Thevenin input impedance of a differential amplifier is

*r*

_{e}

b

*r*

_{e}

2 b

*r*

_{e}

0.5 b

*r*

_{e}

⇒ The output wave of a cycloconverter consists of a number of segments derived from the input wave.

TRUE

FALSE

⇒ In a rectifier only a portion of input power is converted into DC power. The rest is AC power.

TRUE

FALSE

⇒ 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

⇒ From an

*n*channel JFET for V

_{DS}constant and if V

_{GS}is made more negative, pinch off would occur at

higher value of drain current

saturation value of drain current

zero drain current

gate current equal to drain current

⇒ For real and odd signals, the Fourier series coefficient

*a*is

_{n}purely imaginary

purely real and even

purely imaginary and odd

purely real and odd

⇒ A trimmer is basically a

insulator

inductor

capacitor

variable resistor

⇒ A non-inverting voltage feedback amplifier is a

voltage amplifier

current amplifier

current to voltage converter

voltage to current converter

⇒ Which mode has the minimum cutoff frequency in rectangular wave guides?

TE

_{11}

TE

_{10}

TE

_{01}

TE

_{20}

⇒ Gain margin and phase margin can be determined from Bode plots as well as Nyquist plot.

TRUE

FALSE