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Q1. | In the stabilized reactance modulators AFC system |

A. | the discriminator must have a fast time constant to prevent demodulation [Wrong Answer] |

B. | the higher discriminator frequency the better the oscillator frequency stability [Wrong Answer] |

C. | the discriminator frequency must not be too low, or the system will fail [Wrong Answer] |

D. | phase modulation is converted into FM by the equalizer circuit [Correct Answer] |

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

⇒ For matching over a range of frequencies in a transmission line it is best to use

a balun

a broad band directional coupler

double stub

a single stub of adjustable position

⇒ A dominant wave is characterised by which of the following?

No attenuation

Lowest cut off wavelength

Highest cut off wavelength

All of the above

⇒ A half adder adds __________ bits and a full adder adds __________ bits.

two, three

three, four

four, six

two, four

⇒ The sum of 1110101

_{2}and 11011

_{2}in decimal form will be

65

75

85

95

⇒ A capacitance transducer has two plates each of area 5 mm

^{2}. The coil gap is 2 mm. Displacement sensitivity due to change in gap length is

11.1 pF/cm

44.2 pF/cm

52.3 pF/cm

66.3 pF/cm

⇒ Electric lines of force do not cross each other because

the lines of force mutually repel each other

the lines of force emanate from a point charge

the tangent to the line of force gives the direction of E and if they cross two tangents for E which is not possible

none of the above

⇒ In a two phase servomotor the two stator windings have a phase difference of

30°

45°

90°

135°

⇒ A material has conductivity of 10

^{5}mho/m and permeability of 4p x 10

^{-7}H/m. The skin depth at 9 GHz is

1.678 μm

26 μm

17 μm

32.32 μm

⇒ IC (instruction cycle), FC (fetch cycle) and EC (executive cycle) are related as

IC = FC - EC

IC = FC + EC

IC = FC + 2EC

EC = IC + EC

⇒ Which device can detect the presence of both forward and backward waves in a waveguide?

Filter

Detector

Directional coupler

Magic T

⇒ The Fourier series of a real periodic function has only

- Cosine terms if it is even
- Sine terms if it is even
- Cosine terms if it is odd
- Sine terms if it is odd

(1) and (4)

(1) and (2)

(2) and (4)

(2) and (3)

⇒ Which of the following circuits come under the class of sequential logic circuits?

- Full adder
- Full subtractor
- Half adder
- J-K flip-flop
- Counter

1 and 2

1, 2 and 3

3 and 4

4 and 5

⇒ As regards BCH code, Hamming code and Reed-Solomon code

BCH and Hamming code are special cases of Reed-Solomon code

Reed-Solomon and Hamming code are special cases of BCH code

BCH and Reed-Solomon code are special case of Hamming code

none of the above

⇒ The transfer function of a controller is given as K

_{p}+ K

_{d}.

*s*where K

_{p}and K

_{d}are constants. What type of controller is this?

Proportional

Proportional plus integral

Proportional plus derivative

Integral plus derivative

⇒ The effective height of an antenna is slightly greater than physical height because

wave velocity in conductor is less than its velocity in free space

wave velocity in conductor is more than its velocity in free space

resistance of conductor is less than that of free space

none of the above

⇒ In a superheterodyne receiver, the IF stage has better selectivity than RF stage because

of higher frequency

of lower frequency

of high L/C ratio

of constant passband

⇒ If

*x*

*is one sided to the ri*

^{k}TRUE

FALSE

⇒ The image frequency of a superheterodyne receiver is

created within the receiver itself

not rejected by IF tuned circuits

independent of the frequency of tuning

due to insufficient adjacent channel rejection

⇒ The relation AD - BC = 1 where A, B, C, D are transmission parameters of a network is valid for

every network

passive but not reciprocal network

passive and reciprocal network

both active and passive networks

⇒ A + 1.9 lens has a focal length of 25 mm. The diameter of lens is about

13 mm

1.3 mm

130 mm

none of the above

⇒ Using 2's complement, the largest positive and negative number which can be stored with 8 bits are

+128 and -127

+128 and -128

+127 and -128

+127 and -127

⇒ What is the address space of 8086 CPU?

One Megabyte

256 Kilobytes

1 K Megabytes

64 Kilobytes

⇒ 1 GHz is equal to

10

^{6}Hz

10

^{8}Hz

10

^{9}Hz

10

^{10}Hz

⇒ Time delay of a TTL standard family is about

180 ns

50 ns

18 ns

3 ns

⇒ Which of the following semi-conductor has forbidden energy gap less 1 eV?

Sulphur

Phosphorous

Germanium

Carbon

⇒ Operating point signifies that

zero signal I

_{C}and V

_{BE}

zero signal I

_{C}and V

_{CE}

zero signal I

_{B}and V

_{CE}

zero signal I

_{C}, V

_{CE}

⇒

Match the following:

List I (Logic) | List II (Characteristic) | ||
---|---|---|---|

A. | RTL | 1. | High fan out |

B. | CMOS | 2. | Highest speed of operation |

C. | I^{2}L | 3. | High noise immunity |

D. | ECL | 4. | Lowest product of power and delay |

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

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

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

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

⇒ The maximum power output of a standard A earth station over the total band allocated to satellite communication is about

0.5 kW

8 kW

20 kW

50 kW

⇒ Which of the following is a digital modulation technique?

PCM

PSK

DM

All

⇒ A loop antenna may be of

square on triangular shape

hexagonal shape

circular shape

any of the above