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Q1. | In case of frequency modulation, modulating voltage remains constant if the modulating frequency is lowered, then |

A. | amplitude of distant sidebands decreases [Wrong Answer] |

B. | amplitude of distant sidebands increases [Correct Answer] |

C. | amplitude of distant sidebands remains constant [Wrong Answer] |

D. | amplitude of distant sidebands first increases, then decreases [Wrong Answer] |

View Answer
Explanation:-
Answer : BDiscuss 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 sensitivity curve of a standard receiver is represente

curve A

curve B

curve C

curve D

⇒ If X = 2.5 and Y = 2.5, which of the following expressions would give the result as 5/7?

X + 2.5 / Y + 3.0

(X + 2.5) / Y + 4.5

(X + 2.5) / (Y + 4.5)

(X + 2.5) / Y + 3.5

⇒ For TM waves in a parallel plate waveguide, the minimum attenuation arising from imperfect conductors would occur at a freq. of (

*f*is the cut off frequency)

_{c}3

*f*

_{c}3

*f*

_{c}2

*f*

_{c}2

*f*

_{c}⇒ The fuse material used in electrical lines must have which one of the following properties?

High resistivity

Low conductivity

High melting point

Low melting point

⇒ For circuit in figure, which combination of V

_{TH}and R

_{TH}represents the circuit as seen from

*ab<*

1 V, 10 Ω

1 V, 1000 Ω

1 mV, 1000 Ω

1 mV, 10 Ω

1 V, 10 Ω

1 V, 1000 Ω

1 mV, 1000 Ω

1 mV, 10 Ω

⇒ In the 8421 BCD code, the decimal number 125, is written as

1111101

0001 0010 0101

7 D

none of these

⇒ The dielectrics having only one kind of atoms are known as elemental dielectrics.

TRUE

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⇒ There are four different algorithms A1, A2, A3 and A4 to solve, a given problem with the complexity order log(n), log(log(n)), n log and n/log(n) respectively. Which is the best algorithm?

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⇒ The impulse response

a is positive and β is positive

a is negative and β is negative

a is positive and β is negative

a is negative and β is positive

⇒ A ship-to-ship communication system is plagued by fading. The best solution seems to be the use of

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a broad band antenna

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⇒ The 8085 microprocessor is interrupted while executing MOV instruction at location 0210 H. What is the location at which contents of register D are stored

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⇒ When the gate terminal of MOSFET is positive, it is said to operate in

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none of the above

⇒ In MTI radar, clutter means

echos from moving targets

echos from stationary targets

atmospheric noise

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⇒ Gain of isotropic antenna is

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⇒ Which group of instructions is used to change sequence of operations in a computer program?

Data transfer group

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⇒ In a single-stage RC coupled common emitter amplifier, the phase shift at the lower 3 dB frequency is

zero

135°

180°

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

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

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

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⇒ Read the following statements about Java

All

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⇒ A periodic voltage has following values 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

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insufficient data

none

⇒ Which of the following is correct (FDM means Frequency Division Multiplexing and TDM means Time Division Multiplexing)?

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FDM requires channel synchronization while TDM has more noise immunity

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⇒ The standard FORTRAN exponential form of decimal number 0.0000437 is

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4.37 E - 4

43.7 E - 5

43.7 E - 4

⇒ In figure V

10 mA

20 mA

30 mA

40 mA

⇒

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

Both A and R are correct but R is not correct explanation for A

A is correct R is wrong

A is wrong R is correct

⇒ L/C has the dimension of

time

capacitance

inductance

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⇒ The signal m(

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4 cos 100 p

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none

⇒ Linear transistor circuits always operate in

saturation region

cut off region

active region

passive region

⇒ Consider isotropic radiator radiating a power of 1 watt. At a distance of 1 metre, the power per unit area with equal

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2p watt/m

⇒ δ(

energy signal

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none

⇒ A memory system has a 9 chips. If MTBF of one clip is 900 000 hours, MTBF of complete memory system is

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100000 hours

8100000 hours

1800000 hours

⇒ In the 8421 BCD code, the decimal number 125, is written as

1111101

0001 0010 0101

7 D

none of these

⇒ The dielectrics having only one kind of atoms are known as elemental dielectrics.

TRUE

FALSE

⇒ There are four different algorithms A1, A2, A3 and A4 to solve, a given problem with the complexity order log(n), log(log(n)), n log and n/log(n) respectively. Which is the best algorithm?

A1

A2

A3

A4

⇒ The impulse response

*h*(*t*) of a linear time-invariant continuous time system is described by*h*(*t*) = exp (a*t*)*u*(*t*) + exp (β*t*)*u*(-*t*), where*u*(*t*) denotes the unit step function, and a and β are constants. This system is stable ifa is positive and β is positive

a is negative and β is negative

a is positive and β is negative

a is negative and β is positive

⇒ A ship-to-ship communication system is plagued by fading. The best solution seems to be the use of

space diversity

frequency diversity

a broad band antenna

a more directional antenna

⇒ The 8085 microprocessor is interrupted while executing MOV instruction at location 0210 H. What is the location at which contents of register D are stored

054 CH

054 DH

054 EH

054 FH

⇒ When the gate terminal of MOSFET is positive, it is said to operate in

depletion mode

conduction mode

enhancement mode

none of the above

⇒ In MTI radar, clutter means

echos from moving targets

echos from stationary targets

atmospheric noise

thermal noise

⇒ Gain of isotropic antenna is

10 dB

0 dB

∞

1 dB

⇒ Which group of instructions is used to change sequence of operations in a computer program?

Data transfer group

Branch group

Arithmetic group

Logic group

⇒ In a single-stage RC coupled common emitter amplifier, the phase shift at the lower 3 dB frequency is

zero

135°

180°

225°

⇒

Match the following:

List I (Transmission system) | List II (Mode) | ||
---|---|---|---|

A. | Rectangular waveguide | 1. | TE/TM |

B. | Circular waveguide | 2. | TEM |

C. | Coaxial line | 3. | Quasi TEM |

D. | Microstrip line |

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

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

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

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

⇒ Read the following statements about Java

- It is well suited to design software which works in conjunction with internet.
- It is cross platform language.
- Java is close to programming language C, C ++ etc.
- It is an object oriented.

All

1, 2 and 3 only

1, 2 and 4 only

2, 3, 4 only

⇒ Which of the following microphones is used as a standard for calibration?

Moving coil

Carbon

Condenser

Ribbon

⇒ A periodic voltage has following values 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 volt

32 volt

insufficient data

none

⇒ Which of the following is correct (FDM means Frequency Division Multiplexing and TDM means Time Division Multiplexing)?

FDM requires lower bandwidth but TDM has more noise immunity

FDM has more noise immunity and requires lower bandwidth than TDM

FDM requires channel synchronization while TDM has more noise immunity

FDM requires more multiplexing while TDM requires band pass filter

⇒ The standard FORTRAN exponential form of decimal number 0.0000437 is

4.37 E - 5

4.37 E - 4

43.7 E - 5

43.7 E - 4

⇒ In figure V

_{CE}(sat) = 0.1 V. Then I_{C}(sa10 mA

20 mA

30 mA

40 mA

⇒

**Assertion (A):** In an RC coupled amplifier the junction capacitances can be neglected at low frequencies but not at high frequencies

**Reason (R):** Capacitive reactance is inversely proportional to frequency.

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

Both A and R are correct but R is not correct explanation for A

A is correct R is wrong

A is wrong R is correct

⇒ L/C has the dimension of

time

capacitance

inductance

resistance

⇒ The signal m(

*t*) = 10 cos 100 p*t*is sampled at the rate of F_{s}= 75 H_{z, }then determine signal after sampling.4 cos 100 p

*t*+ 8 sin 200 p*t*4 cos 100 p

*t*+ 8 sin 200 p*t*+ cos 75 p*t*4 cos 25 p

*t*+ 8 sin 50 p*t*+ cos 75 p*t*none

⇒ Linear transistor circuits always operate in

saturation region

cut off region

active region

passive region

⇒ Consider isotropic radiator radiating a power of 1 watt. At a distance of 1 metre, the power per unit area with equal

1 watt/m

^{2}4p watt/m

^{2}1/4p watt/m

^{2}2p watt/m

^{2}⇒ δ(

*t*) is aenergy signal

power signal

neither energy nor power

none

⇒ A memory system has a 9 chips. If MTBF of one clip is 900 000 hours, MTBF of complete memory system is

900000 hours

100000 hours

8100000 hours

1800000 hours