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Q1. | The disadvantage of FM over AM is that |

A. | high output power is needed [Wrong Answer] |

B. | high modulating power is needed [Wrong Answer] |

C. | noise is very high for high frequency [Wrong Answer] |

D. | large bandwidth is required [Correct Answer] |

View Answer
Explanation:-
Answer : DDiscuss 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 :**

⇒ Which of the following antennas is λ /4 length?

Dipole

Marconi

Monopole

Parabolic

⇒ The total number of leads in MOS controlled thyristor is

2

3

4

2 or 3

⇒ The generally used value of EHV supply in TV receivers is

1 kV per diagonal cm

1 kV per diagonal inch

0.5 kV per diagonal cm

0, 5 kV per diagonal inch

⇒ An ideal rectifier should have

100% efficiency, zero ripple factor, zero harmonic factor and unity displacement factor

100% efficiency, zero tipple factor, zero harmonic factor and zero displacement factor

100% efficiency, zero ripple factor, unity harmonic factor and unity displacement factor

100% efficiency, unity ripple factor, zero harmonic factor and unity displacement factor

⇒

Match the following:

List I (Instrument) | List II (Measured quantity) | ||
---|---|---|---|

A. | Hot wire | 1. | only voltage |

B. | PMMC | 2. | phase |

C. | Electrostatic | 3. | true RMS value |

D. | Lock in Amplifier | 4. | dc value |

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

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

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

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

⇒ In a bipolar junction transistor the base region is made very thin so that

recombination in base region is minimum

electric field gradient in base is high

base can be easily fabricated

base can be easily biased

⇒ In a CE bipolar transistor operating in active region, collector current is independent of

V

_{CE}

I

_{B}

both V

_{CE}and I

_{B}

none of the above

⇒ A single phase half wave converter is feeding a resistive load. Output dc power is P

_{dc}and total power delivered to load is P

_{ac}then

P

_{dc}= P

_{ac}for all values of firing angles

P

_{dc}= P

_{ac}if firing angle is less than 180°

P

_{dc}< P

_{ac}for all values of firing angles

P

_{dc}< P

_{ac}if firing angle is less than 180°

⇒ A dynamometer wattmeter is connected in ac circuit. The reading will be

V-A product

average power

peak power

instantaneous power

⇒ A periodic voltage has following value for equal time intervals changing suddenly from one value to next... 0, 5, 10, 20, 50, 60, 50, 20, 10, 5, 0, -5, -10 etc. Then rms value of the waveform is

31 V

32 V

insufficient data

none of these

⇒ When satellite radio beam is aimed towards earth, it illuminates on the earth for an oval shaped area called

foot print

beam area

satellite service area

radiated area

⇒ The cascade amplifier is a multistage configuration of

CC-CB

CE-CB

CB-CC

CE-CC

⇒ Square root of 4 is

(16)

_{16}

(2)

_{2}

(8)

_{16}

(5)

_{16}

⇒ For the two ports in figure,

*y*

_{11}= 8 mho,

*y*

_{12}=

*y*

_{21}= -6 mho and

*y*

_{22}= 6 mho. The values of Y

_{A}, Y

_{B}, Y

_{C}respectively

2, 6, 6 mho

2, 6, 0 mho

2, 0, 6 mho

2, 6, 8 mho

⇒ Tropospheric scatter propagation is not subject to any fading.

TRUE

FALSE

⇒ Which of the following statement regarding single-sideband (SSB) transmission is not correct?

In such transmission only or sideband is transmitted, leaving of the other sideband and the carrier

It has gained general acceptance of use in home-entertainment equipment

It is generally reserved for point-to-point communication

The amount of power and bandwidth necessary to be transmitted for a given amount of information are appreciable reduced

⇒ Household taperecorders generally use

crystal microphone

moving coil microphone

condenser microphone

cardioid microphone

⇒ An 8 bit transistor register has output voltage of low-high-low-high-low-high-low-high. The decimal number stored is

105

95

85

75

⇒ The analog signal given below is sampled by 600 samples per se

600 Hz

120 Hz

300 Hz

360 Hz

⇒ The decimal equivalent of the binary number 10110.0101011101 is

22.24082165

22.340821675

22.3408213125

22.3408203125

⇒

**Assertion (A):** An ideal rectifier should have unity harmonic factor

**Reason (R):** An ideal rectifier should have unity displacement factor.

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

⇒ In which of the following devices can the operation be visualised in terms of a series feedback loops?

TWT

Reflex klystron

Klystron amplifier

Backward wave oscillator

⇒ 10's complement of 16

_{10}is

83

_{10}

84

_{10}

38

_{10}

48

_{10}

⇒ Multiplexer can be used as logic function generator.

TRUE

FALSE

⇒ Lowest resistivity of the following is

constantan

german silver

manganin

nichrome

⇒ In a multiphase chopper, all choppers operate together.

TRUE

FALSE

⇒ Divergence of curl A is

∇ . (∇ x A) = 1

∇ . (∇ x A) = 0

∇ . (∇ x A) = ∇

∇ . (∇ x A) = - ∞

⇒ A noiseless 3 KH

*z*channel can transmit binary at the rate __________ .

12000

*bps*

10000

*bps*

6000

*bps*

3000

*bps*

⇒ An ideal current source has

infinite source resistance

zero source resistance

large value of source resistance

finite value of source resistance

⇒ The Hilbert transform of cos ω

_{1}

*t*+ sin ω

_{2}

*t*is

sin ω

_{1}

*t*+ cos ω

_{2}

*t*

sin ω

_{1}

*t*- cos ω

_{2}

*t*

cos ω

_{1}

*t*- cos ω

_{2}

*t*

sin ω

_{1}

*t*+ sin ω

_{2}

*t*