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Q1. | UHF and microwaves in the frequency range 300 MHz to 30 GHz can be best transmitted using __________ propagation |

A. | sky wave [Wrong Answer] |

B. | ground wave [Wrong Answer] |

C. | duct [Correct Answer] |

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

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Explanation:-
Answer : CDiscuss 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 :**

⇒ Magnetic flux density has the dimensions

MI

^{-1}T

^{-2}

M

^{-1}I

^{-2}T

^{-2}

ML

^{-3}T

^{-2}

MI

^{-1}T

^{-3}

⇒ 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}

⇒ The encapsulation of transistor is necessary for

preventing radio interference

preventing photo-emission effects

avoiding loss of free electrons

mechanical ruggedness

⇒ 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

⇒ In the given figure power meters at A and B indicate 1 mW and 110 μW respectively. VSWR of lin

1.5

2

2.5

3

⇒ Identify which of the following is not a tree of the graph shown in fi

*bcgh*

*defg*

*abfg*

*aegh*

⇒ For emitter-couple logic, the switching speed is very high because

negative logic is used

the transistors are not saturated when conducting

emitter-coupled transistors are used

multi-emitter transistors are used

⇒ The radiation resistance of a circular loop of one turn is 0.01 ohm. For 5 turn loop the radiation resistance is

0.002 Ω

0.01 Ω

0.05 Ω

0.25 Ω

⇒ For a quadratic factor in transfer function the phase angle is not a function of damping factor.

TRUE

FALSE

⇒ The ideal characteristics of a stabilizer is

constant output voltage with low internal resistance

constant output current with low internal resistance

constant output voltage with high internal resistance

constant internal resistance and constant output current

⇒ The number of inputs and outputs in a full adder are

2 and 1

2 and 2

3 and 3

3 and 2

⇒ Which of the following instruction modes does not exist in microprocessor 8085?

Inherent

Immediate

Absolute

Indirect

⇒ Thermistor is used in

temperature measurement

temperature control

high temperature alarm circuits of devices

all of the above

⇒

Match the following:

List I (DOS commands) | List II (Meaning) | ||
---|---|---|---|

A. | ATTRIB | 1. | Displays all directories and subdirectories |

B. | SCAN DISK | 2. | Moves files to another director |

C. | MOVE | 3. | Checks the status of disc |

D. | TREE | 4. | Hides a file |

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

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

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

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

⇒ The depletion type MOSFET can operate in

depletion mode only

enhancement mode only

depletion or enhancement mode

neither depletion nor enhancement mode

⇒ In portable instruments, damping is provided by

spring

gravity

eddy current

either (a) or (c)

⇒ Which of the following is a valid real constant in FORTRAN 77?

1.2 E 231

3 E - 2

-3.2 E 2.3

1.2 E 23

⇒ Fourier transform and F(

*j*ω) of a signal

*f*(

*t*) has the property

F(

*j*ω) = F(-

*j*ω)

F(

*j*ω) = -F(-

*j*ω)

F(

*j*ω) = F

^{*}(

*j*ω)

F(

*j*ω) = -F

^{*}(-

*j*ω)

⇒ Which of the following is not an assembler directive in 8085?

D S

D B

D Q

E Q U

⇒ A class A transformer coupled power amplifier is to deliver 10 W output. The power rating of transistor should not be less than

5 W

10 W

20 W

40 W

⇒ In figure, I

_{D}= 4 mA. Then V

_{DS20 V16 V4 V0.4 V}

⇒ The depth of modulation is doubled in FM system then, the power transmitted

increase by factor of 2

increase by factor of 3

increase by factor of 2

none of the above

⇒ A pure tone at 1000 Hz has a dB level of 50 dB. If two such tones exist simultaneously the dB level is about

50 dB

53 dB

100 dB

200 dB

⇒ The operator precedence in Java is in the order

arithmetic operation, increment and decrement operation, comprassion, logical operation and assignment operation.

increment and decrement operation, arithmetic operation, comparison, logical operation and assignment operation.

comparison, arithmetic operation, increment and decrement operation, logical operation and assignment operation.

arithmetic operation, comparison operation, increment and decrement operation, logical operation and assignment operation.

⇒ In a second order system ω

*= 10 rad/sec and ζ = 0.1, then ω*

_{n}_{d}=

9.1 rad/sec

9.95 rad/sec

9 rad/sec

1 rad/sec

⇒ For a hollow waveguide, the axial current must necessarily be

combination of conduction and displacement current

conduction current only

time varying conduction current and displacement current

displacement current only

⇒ The function Z(

*s*) has a pole at infinity if

the degree of numerator and denominator of Z(

*s*) are equal

the numerator of Z(

*s*) is one degree higher than denominator

the denominator of Z(

*s*) is one degree higher than numerator

the degree of numerator and denominator are either equal or differ by one

⇒ Nichrome is commonly used for

lamp filaments

transformer winding

heater coils

battery connections

⇒ In which

*n*type device does

*p*substrate extend upto silicon dioxide layer?

JFET

Depletion type MOSFET

Enhancement type MOSFET

Both (b) and (c)

⇒ Maximum rectification efficiency for a half wave rectifier is

1

0.88

0.5

0.406