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Q1. | An S/N ratio of 3 expressed in db is |

A. | 4.8 dB [Correct Answer] |

B. | 2.4 dB [Wrong Answer] |

C. | 0.48 dB [Wrong Answer] |

D. | 0.24 dB [Wrong Answer] |

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

⇒ Which one of the following is valid integer variable in FORTRAN 77?

`BRG`

`IBRG`

`VS`

`PEC`

⇒ The electric energy required to raise the temperature of a given amount of water is 1000 kWh. If heat losses are 25%, the total heating energy required is __________ kWh.

1500

1250

1333

1000

⇒ If input ac is 10 V

_{rms}, then maximum voltage that will appear across the diode of a half wave rectifier with a capacitor I/P filter will be

10 V

14 V

20 V

28 V

⇒ The static electric field in a conductor is

zero

unity

infinity

none of the above

⇒

**Assertion (A):** The expression E = - ΔV, where E is the electric field and V is the potential is not valid for time varying fields.

**Reason (R):** The curl of a gradient is identically zero.

Both A and R are individually true and R is the correct explanation of A

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

A is true but R is false

A is false but R is true

⇒ FET can used in

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cascade amplifier circuits

digital circuits

all of the above

⇒ If ω is the frequency of modulating voltage in FM, the modulation index is proportional to

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ω

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⇒ Fibers have numerical aperture (

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high bandwidth

reduced losses and low bandwidth

more losses and low bandwidth

⇒ A transistor has a maximum power dissipation of 350 mW at an ambient temperature of 25°C. If derating factor is 2 mW/°C, the maximum power dissipation for 40°C ambient temperature is

300 mW

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350 mW

380 mW

⇒ Microwaves

get reflected by ionosphere

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⇒ For the output F to be 1 in the logic circuit shown, the input combination shoul

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A = 1, B = 0, C = 0

A = 0, B = 1, C = 0

A = 0, B = 0, C = 1

⇒ The trigonometric Fourier series for the waveform

*f(t)*shown below con

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only cosine terms and a positive value for the dc component

only cosine terms and a negative value for the dc component

only sine terms and a negative for the dc component

⇒ Multiphase choppers are used in

low power circuits

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both low and high power circuits

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⇒ The Boolean expression A ⊕ B is equivalent to

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⇒ Consider the following

- A signal
*f*(*t*) and its Hilbert transform*f*(_{h}*t*) have the same energy density spectrum - A signal
*f*(*t*) and its Hilbert transform,*f*(_{h}*t*) have the same auto correlation function - A signal
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1, 2 and 3

1 and 2 only

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⇒ Which of the following configuration has low thermal stability?

CB

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CE

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⇒ The data of speed of train V and resistance to motion

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3.2 + 0.0012 V

^{2}

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⇒ In solids the current flow is due to electrons only.

TRUE

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⇒ The number of cells in a 4 variable K map is

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4

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⇒ Which of the following terms are applicable to troposcatter propagation?

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SIOs

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⇒ It is possible to use a freewheeling diode in

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single phase half wave controlled rectifier but not in single phase full wave controlled rectifier (M - 2 connection)

single phase full wave controlled rectifier (M - 2 connection) but not in single phase half wave controlled rectifier

all controlled rectifier circuits

⇒ In the circuit shown in the given figure, the current flowing through resistance of 100 Ω woul

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⇒ An engineer designs an amplifier to have a voltage gain of 60, but when constructed it only had a gain of 50. How much feedback should be used to provide the desired level?

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0.033

⇒

**Assertion (A):** The reverse current in a *p*-*n* junction is nearly constant.

**Reason (R):** The reverse breakdown voltage of a *p-n* diode depends on the extent of doping.

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

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

A is true but R is false

A is false but R is true

⇒ Figure represen

NPN transistor

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Zener diode

Power diode

⇒ If S represents the carrier synchronization at the receiver and r represents the bandwidth efficiency, then the correct statement for the coherent binary PSK is

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SSB

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⇒ In a pure sample of silicon

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⇒ The real part of complex dielectric constant and tanδ for a dielectric are 2.1 and 5 x 10

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1.05 x 10

^{-2}