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Q1. | Which of the following statement is false? |

A. | Television signals are propagated as ground waves [Wrong Answer] |

B. | Surface waves can propagate on piezoelectric substrates [Wrong Answer] |

C. | The skip distance is the maximum distance upto which ionospheric reflection is possible [Correct Answer] |

D. | Tropospheric scatter propagation is always subjects to fading [Wrong Answer] |

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

⇒ In figure, I = 2A, then

5 V

3 V

2 V

1 V

⇒ In figure the phase

will be 90° at ω = 0 and 0° at ω = ∞

will be 0° at ω = 0 and 90° at ω = ∞

will be 45° at ω = 0 and 0° at ω = ∞

will be 45° at ω = 0 and 90° at ω = ∞

⇒

**Assertion (A):** In many materials, dielectric polarization causes mechanical distortion.

**Reason (R):** If dielectric polarization causes mechanical distortion then mechanical distortion must cause dielectric polarization.

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 radiation thermometer is suitable for temperatures

below 500°C

below 100°C

above 500°C

above 1400°C

⇒ Reflex klystron oscillator is essentially a low power device

TRUE

FALSE

⇒ The number of key words in C is

4

8

16

32

⇒ Consider a parallel plate capacitor being charged. Identify the incorrect statements

Energy stored in the capacitor does not enter it through the connecting wires but through the space around the wires and plates uf capacitor

Rate at which energy flows into this volume is equal to the integration of the Poynting vector over the boundary of the volume between the plates.

The Poynting vector points everywhere radially outward of the volume between the plates

The Poynting vector points everywhere radially into the volume between the plates.

⇒ Four MSI TTL 4-bit ripple counters are cascaded to form a 16-bit binary counter. Its propagation delay is about __________ nanoseconds.

70

140

210

280

⇒ A microcomputer has a 64 K memory. What is the hexadecimal notation for the first memory location?

0

FFFF

0FFF

3FFF

⇒ The drift velocity of electrons is

very small as compared to speed of light

equal to speed of light

almost equal to speed of light

half the speed of light

⇒ The direction of force an a conductor carrying current and lying in a magnetic field can be found by using

Fleming's left hand rule

Fleming's right hand rule

Cork screw rule

Any of the above

⇒ Generally, the gain of a transistor amplifier falls at high frequency due to the

internal capacitance of the device

coupling capacitor at the I/P

skin effect

coupling capacitor at the O/P

⇒ The most commonly used system of modulating for telegraphy is

single tone modulation

on-off keying

frequency shift keying

pulse code modulation

⇒ A waveguide section in a microwave circuit acts as

LP filter

Bandpass filter

HP filter

Band stop filter

⇒ A voltage v = 5 + 50 sin ω

*t*/ + 5 sin 5 &omega

*t*is applied to a pure capacitor of capacitance 1 ωF. If

*f*/= 314 rad/sec, current is

1 + 0.0157 cos 314

*t*+ 0.00785 cos 1570

*t*

0.0157 cos 314

*t*+ 0.00785 cos 1570 t

0.0157 sin 314

*t*+ 0.00785 sin 1570

*t*

0.0157 sin (314

*t*/ + 45°) + 0.00785 sin (1570

*t*+ 45°)

⇒ The pole zero diagram of an impedance Z has a pole at

*s*= - 6 and zero at

*s*= - 4 as shown in figure the constant multiplier

*k*= 1. For a signal I

_{s}= cos 6

*t*, the steady state voltage across Z is given in magnitude as u

0.6

0.84

7.2

none

⇒ 1011

_{2}x 101

_{2}= __________

_{10}

55

45

35

25

⇒ If

*e*= 10 sin(10

^{8}

*t*+ 3 sin 10

^{4}

*t*) then the deviation is

4.77 kHz

47.7 kHz

477 kHz

4770 kHz

⇒ In a rectangular waveguide if operating frequency is greater than cut off frequency then propagation constant is

purely real

purely imaginary

equal to unit

a complex number

⇒ If sequence

*y*(

*n*) =

*x*(-

*n*) then it is

Causal

Non-Causal

Depends on

*x*(-

*n*)

None

⇒ The discussing sharing of a communication satellite by many geographically dispersed Earth station, DAMA means

Demand-Assigned Multiple Access

Decibel Attenuated Microwave Access

Digital Analog Master Antenna

Dynamically-Assigned Multiple Access

⇒ At T = 0, the resistivity of a perfect single crystal of a metal is

0

low

high

finite

⇒ For an ac sinusoidal wave, the rms value is 10 A. For the same wave delayed by 60° in each half cycle, the rms value is likely to be

0.416666666666667

7.07 A

6.35 A

3.5 A

⇒ Saturation region of a JFET is also known as

source region

analog region

pinch off region

ohmic region

⇒ Consider an input

*x*(

*t*) as sh

-2 <

*t*< 6

0 <

*t*< 11

-2 <

*t*< 5

2 <

*t*< 6

⇒ Fourier transform of an external exponential

*e*

*W0*

^{j}*t*

δ(

*f*-

*f*

_{0})

1

δ(

*f*+

*f*

_{0})

∞

⇒ For Bode plot of (1 +

*j*ωT) has

slope of 20 dB/decade and phase angle + tan

^{-1}(ωT)

slope of - 20 dB/decade and phase angle + tan

^{-1}(ωT)

slope of 20 dB/decade and phase angle - tan

^{-1}(ωT)

slope of - 40 dB/decade and phase angle - tan

^{-1}(ωT)

⇒ The 6

*V*zener diode shown in figure has zero zener resistance and a knee current of 5 mA. The minimum value of R, so that the voltage across it does not fall below 6

1.2

*k*Ω

80 Ω

50 W

0

⇒ Gold is often diffused into silicon PN junction devices to

increase the recombination rate

reduce the recombination rate

make silicon a direct gap semiconductor

make silicon semimetal

⇒ The rule that resistivity of conductors can be separated into two parts viz. temperature independent and temperature dependent is known as

Matthiessen's rule

Debye rule

Curie rule

Onne's rule