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Q1. | FSK is a system involving |

A. | pulse modulation [Wrong Answer] |

B. | frequency modulation [Correct Answer] |

C. | amplitude modulation [Wrong Answer] |

D. | phase modulation [Wrong Answer] |

View Answer
Explanation:-
Answer : BDiscuss 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 :**

⇒ Which is correct for a vacuum triode?

μ =

*r*

_{p}

*g*

_{m}

*r*

_{p}= μ

*g*

_{m}

*g*

_{m}= μ

*r*

_{p}

*r*

_{p}

*g*

_{m}

⇒ The eigen values of a skew symmetric matrix are

always zero

always pure imaginary

either zero or pure imaginary

always real

⇒ In a picture tube, the video signal is applied to

cathode

grid

any anode

either cathode or grid

⇒ In the television system in India, the aspect ratio is

0.16875

0.127777777777778

0.211111111111111

0.170138888888889

⇒ The colour subcarrier and sidebands produced by its modulation with the chrominance signals are accommodated in the standard channel width by the process of

frequency adjustment

frequency interleaving

frequency changing

frequency amalgamation

⇒ The emission of light is LED due to

emission of holes

emission of electrons

generation of electromagnetic radiations

conversion of heat energy into illumination

⇒ Simplify : A + B + A B + (A + B)AB + C(B + AB)

B + A

*C*

C

1

⇒ The resonance frequency of the circui

5.4 K

*n*

_{2}

4.5 K

*n*

_{2}

5 K

*n*

_{2}

∞

⇒

**Assertion (A):** The data bus and address bus of 8085 are multiplexed.

**Reason (R):** Multiplexing reduces the number of pins.

Both A and R are correct and R is correct explanation of A

Both A and R are correct but R is not correct explanation of A

A is correct R is wrong

A is wrong R is correct

⇒ Which of the following is not a valid character constant in C?

A'

2'

='

2

⇒

**Assertion (A):** The line integral of B about a closed contour, in a region containing steady current, is μ_{0} times the total net current, following through the contour of integration.

**Reason (R):** The curl of B is equal to μ_{0} times the current density vector J

Both (A) and (R) are true and (R) is the correct explanation of (A)

Both (A) and (R) are true but (R) is not the correct explanation of (A)

(A) is true but (R) is false

(A) is false but (R) is true

⇒ Dielectric strength of which of the following material has the highest dielectric strength?

Porcelain

Soft rubber

Glass

Joule effect

⇒ All other parameters remaining the same, a 3 phase bridge inverter with 180° mode of operation

has the same peak thyristor current as in 120° mode of operation

has higher peak thyristor current than in 120° mode of operation

has lower peak thyristor current than in 120° mode of operation

any of the above

⇒ The potential that appears at a point in space due to the current which caused it is called potential

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retardation

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⇒ Consider the following statements regarding sources or error in a Q-meter:

- If a coil with resistance R is connected in direct measurement mode and if the residual resistance of Q-meter is 0.1 R, then the measure Q of the coil would be 1.1 times the actual Q.
- If the inductance to be measured is less than 0.1 mH, the error due to presence of residual inductance cannot be neglected.
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1, 2 and 3

1 and 2 only

2 and 3 only

1 and 3 only

⇒ A sine wave with slew rate distortion looks like

step wave

square wave

triangular wave

cosine wave

⇒ If A = 20 and B = - 7 in PASCAL, A mod B =

6

2

-1

3

⇒ As compared to 17.34° antenna, the total increase in the signal relayed by 4.5° antenna of INTELSAT-IV is

14.85

220

78

3.85

⇒ In figure gain bandwidth produc

200 Hz

200 MHz

200 kHz

2 MHz

⇒ For a single phase half wave converter feeding a resistive load, the firing angle a. The waveshape in below figure is

output voltage

input voltage

voltage drop across thyristor

none of the above

⇒ In a system an input resistance of 20 kΩ causes a noise voltage of 15μV. If two such input resistances each of 20 kΩ are used in parallel, the total noise voltage will be about

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30 μV

7.5 μV

10.6 μV

⇒ A . 0 =

1

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A or 1

⇒ A LASCR has

4 semiconductor layers and 3 junctions

3 semiconductor layers and 2 junctions

2 semiconductor layers and 2 junctions

any of these depending on the rating

⇒ A voltage

*v*= 100 sin ω

*t*+ 10 sin 5 ω

*t*is applied to a pure capacitor having capacitance of 1 μF. If ω = 314 rad/sec, the current through the capacitor is

0.0314 cos 314

*t*+ 0.0157 cos 1570

*t*

0.0314 sin 314

*t*+ 0.0157 sin 1570

*t*

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*t*+ 0.0314 cos 1570

*t*

0.0157 cos 314

*t*+ 0.0157 cos 1570

*t*

⇒ In phase shift keying the input signal is

*s*

_{t}(

*t*) = A cos ω

_{0}

*t*and

*s*

_{2}(

*t*) = - A cos ω

_{0}

*t*

*s*

_{1}(

*t*) =

*s*

_{2}(

*t*) = A cos ω

_{0}

*t*

*s*

_{1}(

*t*) = A cos ω

_{0}

*t*and

*s*

_{2}(

*t*) = A cos (ω

_{0}

*t*+ p/2)

*s*

_{1}(

*t*) = A cos ω

_{0}

*t*and

*s*

_{2}(

*t*) = - A (cos ω

_{0}

*t*+ p/2)

⇒ BCD equivalent of - 8

_{10}is

110

10110

11000

1000

⇒ When performing numerical calculations in floating point arithmetic

- Error may occur due to finite representation of numbers.
- Error may occur due to rounding.
- Error may occur due to finite representation of inherently infinite process.

All

1 and 2 only

1 and 3 only

2 and 3 only

⇒ A copper atom is neutral. Its core has a net charge of

0

1

-1

2

⇒ The resistance of a metallic wire would

increase as

*f*increase

decrease as

*f*increase

remains the same at all frequencies

increase with

*f*up to a certain frequency and then decrease

⇒ A single phase half wave converter is used to charge a battery of 50 V. The thyristor is continuously fired by dc signal. Input voltage is

*v*= V

_{m}sin ω

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from 0 to 180°

when

*v*> 50 V

from 0 to 90°

When

*v*< 50 V