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Q1. | Which wave is also called surface wave? |

A. | Ground wave [Correct Answer] |

B. | Sky wave [Wrong Answer] |

C. | Space wave [Wrong Answer] |

D. | Both (b) and (c) [Wrong Answer] |

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

⇒ A sequence

*x*(

*n*) with the

*z*transform X(

*z*) =

*z*

^{4}+

*z*

^{2}- 2

*z*+ 2 - 3

*z*- 4 is applied as an input to a linear, time invariant system with the impulse response

*h*(

*n*) = 2δ(

*n*- 3) wh

-6

zero

2

-4

⇒ Which of the following characteristic are necessary for a sequential circuit?

- It must have 6 gates
- It must have feedback
- Its output should depend on past value

1, 2, 3

1, 2

2, 3

1, 3

⇒ If X = 1 in the logic equation [X + Z { Y + (Z + X Y)}] { X + Z (X + Y)} = 1, then

Y = Z

Y = Z

Z = 1

Z = 0

⇒ The most serious problems in ac bridge measurement is

eddy currents

leakage current

residual magnetism

stray fields

⇒ Which one of the following circuits is most suitable as an oscillator at a frequency of 100Hz?

Hartley oscillator

Colpitts oscillator

Crystal oscillator

Twin-T oscillator

⇒ The ratio of impurity atoms to intrinsic semiconductor atoms in an extrinsic semiconductor is about.

0.0486111111111111

0.736111111111111

1 : 100000

1 : 10

^{8}

⇒ In Vidicon camera tube, the resistance of photoconductive material on the target plate

is constant

is more in darkness and less in brightness

is more in brightness but less in darkness and brightness

may be more or less in darkness and brightness

⇒ In the given figure, the input frequency is such that R = X

_{C}.

*v*

_{0}lags

*v*

_{i}by 45°

*v*

_{0}lags

*v*

_{i}by 90°

*v*

_{0}leads

*v*

_{i}by 45°

*v*

_{0}leads

*v*

_{i}by 90°

⇒ The network has 10 nodes and 17 branches. The number of different node power voltages would be

7

9

10

45

⇒ In solid dielectrics the rate of deterioration doubles for every 10-12°C rise in temperature.

TRUE

FALSE

⇒ A periodic rectangular signal,

*x*(

*t*) has the waveform shown in the given figure. Frequency of the fifth harmonic of its spectrum is _______

200 Hz

250 Hz

400 Hz

1250 Hz

⇒ Which one of the following is the correct statement? The region of convergence of

*z*transform of

*x*[

*n*] consists of the values of

*z*for which

*x*[

*n*]

*r*

^{-n}is

absolutely integrable

absolutely summable

unity

< 1

⇒ As compared to a BJT amplifier circuit, a JFET amplifier circuit

has low input impedance

has high input impedance

has very low input impedance

may have either low or high input impedance

⇒ A sine wave with slew rate distortion looks like

step wave

square wave

triangular wave

cosine wave

⇒ A radar receiver has a noise figure of 10 dB at 300 K having a bandwidth of 2.5 MHz. The minimum power it can receive is

3.45 x 10

^{-15}W

1.38 x 10

^{-15}W

7.5 x 10

^{-15}W

93.15 x 10

^{-15}W

⇒ A silicon sample A is doped with 10

^{18}Atoms/cm

^{3}of Boron. Another sample B of identical dimensions is doped with 10

^{18}atoms/cm

^{3}of phosphorus. The ratio of electron to hole mobility is 3. The ratio of conductivity of the sample A to B is

3

42738

42769

42796

⇒ For an RC admittance function

the lowest critical frequency is a zero

the highest critical frequency is a pole

the lowest critical frequency is zero and the highest critical frequency is a pole

the lowest critical frequency is a pole

⇒ The Fourier series representation of a periodic current (2 + 62 cos ω

*t*+48 sin 2ω

*t*) A. The effective value is

(2 + 6 + 24) A

0.333333333333333

0.25

0.0833333333333333

⇒ The selectivity curve of a standard receiver is represente

curve A

curve B

curve C

curve D

⇒ In using KCL it is necessary that current leaving a node is written as negative.

TRUE

FALSE

⇒ The maximum permissible distance between two samples of a 2 kHz signal is

1000 μ sec

500 μ sec

250 μ sec

2000 sec

⇒ What is the chemical bonding in silicon semiconductor?

Metallic

Ionic

Covalent

van der Waals

⇒ The phenomenon known as "Early effect" in a BJT refers to a reduction of the effective base width caused by

electron-hole recombination at the base

reverse biasing of the base collector junction

forward biasing of emitter base junction

the early removal of stored base charge during saturation to cut off switching

⇒ A Darlington pair consist of

two CB amplifiers

two CC amplifiers

two cascaded CC amplifiers

two cascaded CE amplifiers

⇒ Equation

*x*

_{l0}= 11001001

_{2}when solved for

*x*gives the value of

*x*as

8

111

152

201

⇒ A bipolar differential amplifier uses a transistor having β

_{0}= 200, I

_{CQ}= 100

*m*A, |A

_{dm}| = 500 and CMRR = 80 dB. The value of R

_{c}and R

_{E}will be respectively __________ .

1.25

*k*Ω, 1.25 MΩ

125

*k*Ω, 1.25 MΩ

1.25 MΩ, 1.25

*k*Ω

3.25

*k*Ω, 3.25 MΩ

⇒ In the figure circuit, V

_{1}= 40 V. When R is 10 Ω. When R is zero, the value of V

_{2}wil

40 V

30 V

20 V

10 V

⇒ In the synthesis of RLC network

the number of elements in Bott-Duffin synthesis and Brune's synthesis are always equal

the number of elements in Bott-Duffin synthesis is more than that in Brune's synthesis

the number of elements in Bott-Duffin synthesis is less than that in Brune's synthesis

the number of elements in Bott-Duffin synthesis may be more or less than that in Brune's synthesis

⇒ Which of the following is not a DTP program?

Page maker

Coral draw

Coral ventura

Coral key

⇒ Laplacian of a scalar function

*v*is

gradient of

*v*

divergence of

*v*

gradient of the gradient of

*v*

divergence of the gradient of

*v*