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Q1. | Which of the following wave remains unaffected during day and night? |

A. | Tropospheric wave [Wrong Answer] |

B. | Sky wave [Wrong Answer] |

C. | Ground wave [Correct Answer] |

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

View Answer
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 :**

⇒ For a waveguide, which of the following statements is wrong?

It is usually made of brass or aluminium

It is usually rectangular or circular in shape

The dielectric region is usually air

The wall thickness is very small as compared to skin depth

⇒ A unipole is also known as

omnidirectional radiator

unidirectional radiator

line radiator

none of the above

⇒ A capacitor stores 0.15C at 5 V. Its capacitance is

0.75 F

0.75 μF

0.03 F

0.03 μF

⇒ In the figure shown, assume that all the capacitors are initially unchanged and V

_{i}(

*t*) = 10 U(

*t*) volts then V

_{0}(

*t*) is give

8

*e*

^{-0.004t}volts

8 (

*j*-

*e*

^{-0.004t}) volts

8

*u*(

*t*) volts

8 volts

⇒ If there is phase error in the carrier signal for the detection of SSB signals, then

the output gets reduced, but a phase distortion results

the output is not reduced, but a phase distortion results

the output is not reduced, and also no distortion

the output is reduced, no phase distortion

⇒

Match the following:

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

A. | Serial Binary adder | 1. | (2n - 1)t_{pd} |

B. | Ripple carry adder | 2. | (n - 1)t_{pd} |

C. | Carry look ahead binary adder | 3. | Operation time independent of size |

4. | 6t for 4 bit carry look ahead adder_{pd} |

A-2, B-1, C-3

A-2, B-1, C-4

A-1, B-2, C-4

A-1, B-2, C-3

⇒ Which of the following uses 'transferred electron effect' for production of microwaves?

Silicon

Germanium

Metal-semiconductor junction

Gallium Arsenide

⇒ How is an N-channel junction Field Effect Transistor operated as an amplifier?

With a forward bias gate source junction

With a reverse bias gate-source junction

With a open gate source junction

With a shorted gate source junction

⇒ A depletion type NMOS is operated in enhancement mode. V

_{p}= - 4 volts. For V

_{GS}= + 3 volts as V

_{DS}is increased, I

_{D}becomes nearly constant when V

_{ps}equals

1 volt

3 volts

4 volt

7 volts

⇒ Among the digital IC families - ECL, TTL, and CMOS

ECL has the least propagation delay

TTL has largest fan out

CMOS has the lowest noise margin

TTL has the lowest power consumption

⇒ When a wave reaches the open circuited end of a line

all the forward energy is reflected by the open circuit

all the forward energy is absorbed by the open circuit

a small portion of energy is radiated into atmosphere and the remaining energy is reflected

either (a) or (b)

⇒ For AM receivers the standard IF frequency is

106 kHz

455 kHz

1.07 MHz

10.7 MHz

⇒ An antenna has 40 Ω resistance and 60 Ω radiation resistance. The efficiency of the antenna is

0.3

0.4

0.5

0.6

⇒ If H(

*s*) is positive real, 1/H(

*s*)

is positive real

is not positive real

may or may not be positive real

must possess some other properties also if it is to be positive real

⇒ Dielectric constant and conductivity of rocky soil and flat sandy soil are around

10 and 20 mho/cm respectively

20 and 10 mho/cm respectively

2 and 5 mho/cm respectively

0.5 and 2 mho/cm respectively

⇒ In a klystron amplifier the transit time of electron passing the gap in the cavity should be

less than one cycle

less than half cycle

less than quarter cycle

more than quarter cycle

⇒ A rectangular waveguide has a discontinuity in the form of reduced narrow dimension. In the equivalent circuit this discontinuity can be represented by

a shunt capacitance at the discontinuity

a shunt inductance at the discontinuity

a shunt resistance at the discontinuity

none of the above

⇒ In an

*n*channel JFET

I

_{D}, I

_{S}and I

_{G}are considered positive when flowing into the transistor

I

_{D}and I

_{S}are considered positive when flowing into transistor and I

_{G}is considered positive when flowing out of it

I

_{D}, I

_{S}, I

_{G}are considered positive when flowing out of transistor

I

_{S}and I

_{G}are considered positive when flowing into transistor and I

_{D}is considered positive when flowing out of it

⇒ The polar plot of G(

*j*ω) = 1/

*j*ω is

positive imaginary axis

positive real axis

negative imaginary axis

negative real axis

⇒ In which function is each term known as minterm?

SOP

POS

Hybrid

Both SOP and POS

⇒ The resolution of a 4 bit counting ADC is 0.5 volts. For an analog input of 6.6 volts, the digital output of the ADC will be

1011

1101

1100

1110

⇒ A 3 phase star-connected load has one capacitor C in R phase and two equal resistances in Y and B phases.The phase sequence is RBY. Then

V

_{B0}> V

_{Y0}

V

_{B0}< V

_{Y0}

V

_{B0}= V

_{Y0}

V

_{B0}= V

_{BY}

⇒ Decimal number 46 in excess 3 code =

1000 1001

0111 1001

0111 1111

1000 1111

⇒ Which of the following 8085 instructions does not belong to arithmetic group?

`SHLD addr`

`SUI data`

`ADCM`

`INR r`

⇒ The reactance of bypass capacitor in a CE amplifier circuit should be

equal to the resistance in parallel with it

equal to 10% or less of the resistance in parallel with it

equal to 50% of the resistance in parallel with it

independent of the resistance in parallel with it

⇒ In an op-amp a virtual ground is a ground for

voltage only

current only

both voltage and current

neither voltage nor current

⇒ 'Rotate instruction' in microprocessor belongs to

data transfer group

arithmetic group

logic group

branch group

⇒ Consider the following statements regarding phase sensitive detector

- The detector reads zero when phases of input signal and reference signal are different.
- The detector acts as a linear rectifier.
- The detector can be used as vector voltmeter.

1, 2, 3

1 and 2

2 and 3

1 and 3

⇒ Beam width of an antenna is expressed in

metres

degrees

ratio of two powers

ratio of two angles

⇒ When a current source I is suddenly connected across a two terminal relaxed RC circuit at time

*t*= 0, the voltage across the current source is shown in figure. The RC circui

a series combination of R and C

a parallel combination of R and C

a series combination of R and parallel combination of R and C

a pure capacitor