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Q1. | In phase modulation, the phase deviation is |

A. | proportional to the amplitude of the signal and varies with frequency [Wrong Answer] |

B. | remains constant while amplitude and frequency of signal varies [Wrong Answer] |

C. | proportional to the amplitude of the signal and independent of the frequency [Correct Answer] |

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

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

⇒ In a two phasor servomotor, the direction of rotation of the rotating field depends on

magnitudes of voltages applied to the two stator windings

phase relation of voltages applied to the two stator windings

both magnitude and phase relationship of voltages applied to the two stator windings

none of the above

⇒ The coefficients F

_{n}in the exponential form of Fourier series are

independent of frequency

functions of frequency

even function of frequency

odd functions of frequency

⇒ An R-C coupled amplifier has mid-frequency gain of 200 and a frequency response from 100 Hz to 20 kHz. A negative feedback network with β = 0.2 is incorporated into the amplifier circuit, the Bandwidth will be

50 kHz

20 kHz

100 kHz

infinite

⇒ For an ideal 3000 Hz channel, S/N ratio is

3

1.5

4

2

⇒ A Si sample is doped with a fixed number of group N impurities. The electron density

*n*is measured from 4 K to 1200

*k*for the sample. Which one of the following is correct?

n remains constant over the temperature range

n increases monotonicaliy with increasing temp

n increases first remains constant over a range and again increases with increasing temperature

n increases show a peak and then decrease with temperature

⇒ An ac network has a power factor of 0.8 lagging for fundamental frequency. If the applied voltage contains thrid and fifth harmonics, the overall power factor will be

more than 0.8 lagging

0.8 lagging

less than 0.8 lagging

0.8 lagging or less

⇒ Junction temperature is always the same as room temperature.

TRUE

FALSE

⇒ Binary number 11011.01 when converted to its 2's complement will become

101.11

1111.1

1100.1

100.11

⇒ A source is delivering maximum power to a resistance through a network. The ratio of power delivered to the source power,

is always 0.5

may be 0.54 or less

may be 0.5 or less

may be 0.5 or more

⇒

Match the following:

List I | List II | ||
---|---|---|---|

A. | Wein bridge oscillator | 1. | Low output impedance |

B. | Voltage shunt feedback amplifier | 2. | RF frequency range |

C. | Crystal oscillator | 3. | Audio frequency range |

D. | Current shunt feedback amplifier | 4. | High input impedance |

5. | High output impedance |

A-3, B-1, C-2, D-5

A-3, B-5, C-1, D-2

A-4, B-3, C-1, D-2

A-5, B-1, C-2, D-1

⇒ If a signal

*g*(

*t*) has energy E, then the energy of the signal

*g*(2

*t*) is equal to ...

E/2

E/4

*E*

2E

⇒ A 10 bit ADC with a full scale output voltage of 10.24 V is to be designed to have ± LSB/2 accuracy. If ADC is calibrated at 25°C, the maximum net temperature coefficient of ADC should not exceed

± 200 μV/°C

± 400 μV/°C

± 600 μV/°C

± 800 μV/°C

⇒ The integral of a unit step function is

an impulse function

a ramp function

a ramp function of slope 1

none of these

⇒ Two port circuits are connected in parallel. To determine the response, it is more convenient to use

O.C. impedance parameters

S.C. admittance parameters

ABCD parameters

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⇒ A power supply has full-load voltage of 20 V. What will be its no load voltage when its voltage regulation is 100%

0 V

10 V

20 V

40 V

⇒ The total area under the probability distribution curve is

1

0

depend upon curve equation

∞

⇒ The sum of two or more arbitrary sinusoidal is

always periodic

periodic under certain conditions

never periodic

periodic only if all the sinusoidals are identical in frequency and phase

⇒

**Assertion (A):** A high *dv*/*dt* may cause triggering of a thyristor.

**Reason (R):** A high *dv*/*dt* results in charging current in the thyristor.

Both A and R are correct and R is correct explanation of A

Both A and R correct but R is not correct explanation of A

A is correct but R is wrong

A is wrong but R is correct

⇒ The sensitivity of human eyes is maximum at

white portion of spectrum

green portion of spectrum

red portion of spectrum

violet portion of spectrum

⇒ The Z inverse of the given Z transfor

Unit step

Unit ramp

Unit impulse

Unit parabola

⇒ Which of the following real expressions is correct in Pascal?

`- Z + P * X `

`(X + Y) (A + B)`

`Z ** M `

`Z P * M`

⇒ Zinc oxide is a non-linear resistance.

TRUE

FALSE

⇒ A 4 bit binary adder has 4 full adders.

TRUE

FALSE

⇒ Kirchoff's voltage law is not valid for a non-linear network

the statement is true

the statement is false

can't say

none of the above

⇒ At

*f*= 7 GHz, a 120 cm dish antenna gives a gain of about

50

500

5000

50000

⇒ In a reflex klystron the output frequency is determined primarily by resonant frequency of cavity.

TRUE

FALSE

⇒ A semiconductor diode is biased in forward direction and carrying current I. The current due to holes in

*p*material is

I

0

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0.5

⇒ Which one of the following is applicable to any network-linear or non-linear, active or passive, time-varying or invariant - as long as Kirchhoff laws are

*not*violated?

Tellegen's theorem

Reciprocity theorem

Maximum power transfer theorem

Superposition theorem

⇒ The circuits with active pull up are preferred because of their stability for

wired - AND operation

wired - OR operation

bus operated system

reasonable dissipation and speed of operation

⇒ The antenna most commonly used for TV broadcasting in the UHF band is

turnstile antenna

dipole antenna

yagi antenna

rhombic antenna