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Q1. | Due to which of the following reasons, the ground wave eventually disappears, as one moves away from the transmitter? |

A. | Tilting [Correct Answer] |

B. | Loss of line-of-eight conditions [Wrong Answer] |

C. | Interference from the sky wave [Wrong Answer] |

D. | Maximum single hop distance limitation [Wrong Answer] |

View Answer
Explanation:-
Answer : ADiscuss 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 :**

⇒ Absolute permeability (μ) is given by __________ henry/metre

4p x 10

^{-12}

4p x 10

^{-7}

8.854 x 10

^{-12}

8.854 x 10

^{-7}

⇒ Figure shows the V-

*i*characteristics of a material. The material is likely t

copper

carbon

zinc oxide

rubber

⇒ For wired AND connection we should use

TTL gates with active pull up

TTL gates with open collector

TTL gates without active pull up and with open collector

any of the above

⇒ For a random variable

*x*following the probability density function, p(

*x*), shown in figure, the mean and the variance are respective

1/2 and 2/3

1 and 4/3

1 and 2/3

2 and 4/3

⇒ Colour picture tube needs higher anode voltage and needs larger beam and cathode currents than monochrome tube because

it is bigger in size

it has higher level of illumination

the tube has to illuminate three phosphors simultaneously

the tube has lower efficiency because of aperture mask

⇒ Which one condition is true to check the periodically for discrete time signal (where K is any integer, N is period,

*f*

_{0}is frequency of signal)

*f*

_{0}= K/N

*f*

_{0}= K + N

*f*

_{0}= KN

*f*

_{0}= N/K

⇒ When analysing two port networks in parallel it is more convenient to use

*z*parameters

*h*parameters

T parameters

*y*parameters

⇒ In a series regulated power supply circuit, the voltage gain A

_{v}, of the 'pass' transistor satisfies the condition

A

_{v}→ ∞

1 << A

_{v}< ∞

A

_{v}≈ 1

A

_{v}<< 1

⇒ The sum S of A and B in a Half Adder can be implemented by using K NAND gates. The value of K is

3

4

5

none of these

⇒ The product

*k*T (where

*k*is Boltzmann's constant and T is absolute temperature) at room temperature is about

0.051 eV

0.026 eV

0.01 eV

0.001 eV

⇒ For the system in the given figure the root l

is on real axis between points

*s*= -1 and

*s*= -3.6

is on real axis between points

*s*= 0 and

*s*= -1

is on real axis between points

*s*= -3.6 and

*s*= ∞

is on real axis between points

*s*= 0 and

*s*= -3.6

⇒ For the characteristic equation

*s*

^{5}+

*s*

^{4}+ 2

*s*

^{3}+ 2

*s*

^{2}+ 3

*s*+ 15 = 0, the number of roots in left half

*s*plane are

1

2

3

5

⇒

**Assertion (A):** In an intrinsic semiconductor J = (μ_{n} x μ_{p})*en*_{i}.

**Reason (R):** Intrinsic charge concentration *n*_{i} at temperature T is given by *n*_{i}^{2} = A_{0} T^{3} *e*^{-EG0/kT}.

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

⇒ A (75 -

*j*40) W load is connected to a co-axial line of

*z*

_{0}= 75ω at 6 MHz. The load matching on the line can be accomplished by connecting

a short circuit stub at the load

an inductance at the load

a short circuit stub at a specific distance from the load

a capacitance at a specific distance from the load

⇒ In a multiphase chopper, the different choppers operate in

series and all simultaneously

parallel and one at a time

parallel and simultaneously

either (b) or (c)

⇒

Match the following:

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

A. | Silicon | 1. | is trivalent |

B. | Arsenic | 2. | rarely used as semiconductor |

C. | Indium | 3. | is pentavalent |

D. | Germanium | 4. | intrinsic semiconductor |

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

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

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

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

⇒ A waveguide behave as

high Pass filter

low Pass filter

band Pass filter

all Pass filter

⇒ In a triode the potential of grid (with respect to cathode) is usually

zero

negative

positive

zero or positive

⇒ A delta modulation system is designed to operate at 3 times the Nyquist rate for a signal with a 3 KHz bandwidth. The quantization step size is 250 mv. The maximum amplitude of a 1 KHz input sinusoidal for which the delta modulator does not show slope overload is :

716.2 mV

500 mV

647.87 mV

400 mV

⇒ Which material is generally used for LED?

Compounds of silica

Compounds of gallium

Compounds of phosphorus

Compounds of sulphur

⇒ For a message signal

*m*(

*t*) = cos (2p

*f*) and the carrier frequency

_{m}t*f*, which of the following represents a single side band (SSB) signal?

_{c}cos (2p

*f*) cos (2p

_{m}t*f*)

_{c}tcos (2p

*f*)

_{c}tcos [2p(

*f*+

_{c}*f*) t]

_{m}[1 + cos (2p

*f*) cos (2p

_{m}t*f*)]

_{c}t⇒ Consider the following statements:

- Internal sorting is used if the number of items to be sorted is very large.
- External sorting is used if the number of items to be sorted is vary large.
- External sorting needs auxiliary storage.
- Internal sorting needs auxiliary storage.

1 and 2

2 and 3

3 and 4

2 and 4

⇒ Consider the following statements for a driving point function F(

*j*ω):

- Re F(
*j*ω) is an even function of ω and is 0 or positive for all values of ω. - Im F(
*j*ω) is an even function of ω and is 0 or positive for all values of ω. - Re F(
*j*ω) is an odd function of ω and is 0 or negative for all values of ω. - Re F(
*s*) = 0 for Re*s*= 0.

1 only

1 and 4

2, 2 and 4

4 only

⇒ Which amplifier will be preferred for highest gain?

Darlington's pair

Single stage amplifier

Cascade amplifier

Depends on the circuitry

⇒ A JK flip flop has

*t*= 12 ns. The largest modulus of a ripple counter using these flip flops and operating at 10 MHz is

_{pd}16

64

128

256

⇒ The carriers of

*n*channel JFET are

free electrons and holes

holes

free electrons or holes

free electrons

⇒ For the logic circuit shown in figure, the simplified Boolean expression for the output

A + B + C

AB

B

C

⇒ In a step down chopper using pulse width modulation, T

_{on}= 3 x 10

^{-3}and T

_{off}= 1 x 10

^{-3}s. The chopping frequency is

333.33

250

500

1000

⇒ Which is the dominant mode in rectangular waveguides?

TE

_{10}

TE

_{11}

TE

_{01}

TM

_{11}

⇒ Which of the following is a valid integer constant?

17

-18.58

101.14

-810