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Q1. | A ship-to-ship communication system is plagued by fading. The best solution seems to be the use of |

A. | space diversity [Wrong Answer] |

B. | frequency diversity [Correct Answer] |

C. | a broad band antenna [Wrong Answer] |

D. | a more directional antenna [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 input impedance for folded dipole antenna (two half dipole) is

73

*n*

^{2}

377

*n*

^{2}

73

*n*

377

*n*

⇒ 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}

⇒ Antenna efficiency of antenna is, if radiation resistance is 370 Ω and loss resistance is 100 Ω

0.8

0.87

0.78

0.2127

⇒ Potentiometer method of dc voltage measurement is more accurate than direct measurement using a voltmeter because

it loads the circuit to maximum extent

it loads the circuit moderately

it does not load the circuit at all

it uses centre zero galvanometer instead of Voltmeters

⇒ For class B operation the theoretical maximum efficiency is

1

0.785

0.5

0.275

⇒ A sine wave of voltage varies from zero to maximum of 200V. How much is the voltage at the instant of 30° of the cycle?

50 V

82.8 V

100 V

173.2 V

⇒ The number of free electrons in acceptor atom is

1

2

3

4

⇒ The pole of a reactive function

lie on

*j*ω axis only

lie on negative real axis only

may lie anywhere on

*s*plane

lie on

*j*ω axis or on negative real axis

⇒ In tape recorder erase head is active during recording.

TRUE

FALSE

⇒ The output of a diode detector contains

D.C. voltage

modulating signal

RF ripple

all of the above

⇒ The damping coefficient for the given circuit is _______

42737

42739

2

1

⇒ If any term in the first column of a Routh array becomes zero, then

Routh criterion cannot be used to determine stability

Routh criterion can be used by substituting a small positive number for zero and completing the array

Routh criterion can be used by substituting a big positive number for zero and completing the array

Routh criterion can be used by substituting a small negative number for zero and completing the array

⇒ In the graph of figure, the total number of tree

4

5

6

8

⇒ The directive gain of λ/2 resonant wire is 1.64.

TRUE

FALSE

⇒ Method of images is applicable to which fields?

Electrostatic fields only

Electrodynamic fields only

Neither electrostatic fields nor electro-dynamic fields

Both electrostatic fields and electro-dynamic fields

⇒ The types of carriers in a semiconductor are

1

2

3

4

⇒

Match the following:

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

A. | Digital counter | 1. | Measurement of harmonics |

B. | Schering Bridge | 2. | Measurement of frequency |

C. | Meggar | 3. | Measurement of loss angle of dielectric |

D. | Spectrum analyser | 4. | Measurement of insulation resistance |

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

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

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

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

⇒ Half bridge and full bridge inverters of one type use different commutation methods.

TRUE

FALSE

⇒

**Assertion (A):** Power loss in a conductor of resistance P = I^{2}R.

**Reason (R):** When a conductor is carrying current with current density J as a result of applied field E, then heat developed/m^{3}/ second = JE.

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

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

A is true but R is false

A is false but R is true

⇒ FM transmitting and receiving equipment as compared to AM equipment is

costly

cheaper

almost equally costly

none of the above

⇒ The magnetization 'm' of a superconductor in a field of H is

extremely small

- H

-1

Zero

⇒ Which of the following frequency is likely to be associated with AM radio broadcast?

1000 kHz

100 MHz

500 MHz

10 GHz

⇒ In the circuit of figure the current through 5 Ω resistance at

*t*= &infin

0.166666666666667

2.5 A

3.1 A

0

⇒ When determining Thevenin's resistance of a circuit

all sources must be open circuited

all sources must be short circuited

all voltages sources must be open circuited and all current sources must be short circuited

all sources must be replaced by their internal resistances

⇒ An RC driving point impedance function has zeros at

*s*= - 2 and

*s*= - 5. The admissible poles are

*s*= 0 and

*s*= -6

*s*= -1 and

*s*= -3

*s*= 0 and

*s*= -1

*s*= -3 and

*s*= -4

⇒ In a N-type semi-conductor, the concentration of minority carriers is mainly depends on

the number of acceptor atoms

the number of donor atoms

the extent of doping

the temperature of the material

⇒ The low pass filter characteristic shown in figure realiza

TRUE

FALSE

⇒ If

*f*(

*t*) = -

*f*(-

*t*) satisfies Drichlet conditions, then

*f*(

*t*) can be expanded in Fourier series containing

only sine terms

only cosine terms

cosine terms and constant

sine terms and constant

⇒ A total of 16 equally probable events exist. If it is required to select one out of them, the number of required bits is

2

4

3

5

⇒ The switching expression corresponding

C D + B C

C ⊙ D

C ⊕ D

CD