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Q1. | In a perfect conductor the resistor noise is |

A. | maximum [Wrong Answer] |

B. | zero [Correct Answer] |

C. | very high [Wrong Answer] |

D. | almost infinite [Wrong Answer] |

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

⇒ In a modem digital computer, a subtractor in normally not used because

subtractors are very expensive

the design of a subtractor is very complex

the adder is geared for doing subtraction

most of the programs do not require subtraction

⇒ The output V

_{R}of the ratio detector is related with the output V

_{F}of similar Foster-Seeley discriminator as follows.

V

_{R}= V

_{F}

V

_{R}< V

_{F}

V

_{R}= 2V

_{F}

V

_{F}= 2V

_{R}

⇒ The circuit in the given figur

positive logic OR gate

negative logic OR gate

negative logic AND gate

positive logic AND gate

⇒ What binary number does second row represent?

1111001

1010101

10101010

11101010

⇒ As per Matthiessen's rule, the total resistivity r of a conductor can be written as r = r

_{i}+

*a*T, where r

_{i}and

*a*are constants and T is absolute temperature. At very low temperatures

*a*T = 0

*a*T > r

_{i}

*a*T ∼ r

_{i}

*a*T < r

_{i}

⇒ A copper coil has a resistance of 40 ohm at 20°C. At 100°C the resistance is likely to be

44 Ω

54 Ω

84 Ω

104 Ω

⇒ For an P-channel enhancement type MOSFET determine the drain current if K = 0.278 x 10

^{-3}A/V

^{2}, V

_{GS}= -4V, V

_{T}= -2V, Voltage equivalent at 27°C = 26 mV.

10 mA

1.11 mA

0.751 mA

46.98 mA

⇒ At room temperature the number of conducting electrons in an intrinsic semiconductor

is almost equal to the number of valence electrons

is about half the number of valence electrons

is small as compared to the number of valence electrons

is a very small fraction of the number of valence electrons

⇒ In figure, the switch has been in closed position for a long time. At

*t*= 0, the switch is opened. At

*t*= 0

^{+}, the current R

_{10.3333333333333330.1666666666666670.250.0833333333333333}

⇒ If the number of information bits is m, the number of parity bits p in the Hamming code is given by equation

2

^{p}= m + p + 1

2

^{p}≥ m + p + 1

2

^{P}= m + p

2

^{p}≥ m + p

⇒ A vibration galvanometer is a

moving coil instrument

moving iron instrument

dynamometer instrument

induction instrument

⇒ Consider the following:

- Si
- Ge
- GaAs
- InP

1 and 4 only

3 and 4 only

1, 3 and 4

2, 3 and 4

⇒ The equation ∇ . J = 0 is called

Poisson's equation

Kirchoff's node equation

Continuity equation for static currents

Continuity equation for sampling currents

⇒ Consider the following statem

2 and 3

1 only

2 and 4

none

⇒ The MOS symbols shown indica

1, 3, 6

2, 4, 6

1, 3, 5

2, 3, 6

⇒ Which of the following statement is correct for two wattmeters method of power measurement in 3 phase circuit?

Power can be measured by this method only for star connected loads

When two wattmeters have equal readings power factor is 0.5.

When power factor is 1, one of the wattmeters readings is zero

When the two wattmeter read equal and opposite, p.f. is zero.

⇒ In figure,

*i*(

*t*) is a unit step current. The steady state value of

*v*(

*t*

2 V

3 V

6 V

9 V

⇒ Which of the following stage is not present in AM receiver as compared to FM receiver?

AM amplifier

Demodulator

Amplitude limiter

AF amplitude

⇒ In measurements using strain gauge, the dummy strain gauge is used to

compensate for resistance of strain gauge

compensate for change in temperature

compensate for error due to change in voltage of battery

compensate for error in voltmeter

⇒ A directional coupler is used

to transmit microwave signals

to generate microwave signals

to measure amplitude and phase of a travelling wave

both (a) and (b)

⇒ Refractive index of glass is 1.5. Find the wavelength of a beam of light with a frequency of 10

^{14}Hz in glass. Assume velocity of light is 3 x 10

^{8}m/sec in vacuum.

4 μm

3 μm

2 μm

1 μm

⇒ In TV scanning sequence of lines is

left to right

right to left

left to right for odd fields and right to left for even field

left to right for even fields and right to left for odd field

⇒ A pre-emphasis circuit provides extra noise immunity by

converting the phase modulation to frequency modulation

pre-amplifying the whole audio band

boosting the base frequencies

amplifying the higher audio frequencies

⇒ During transmission over a communication channel, bit errors occur independently with probability P. If a block of

*n*bits is transmitted, the probability of at most one bit error is equal to

1 - (1 - P)

^{n}

P + (

*n*- 1) (1 - P)

*n*P (1 - P)

^{n - 1}

(1 - P)

^{n}+

*n*P (1 - P)

^{n - 1}

⇒ An ac sinusoidal wave has an rms value of 10 V. The peak to peak value is

10 V

0 V

14.14 V

28.28 V

⇒ In two level logic, logic race does not occur.

TRUE

FALSE

⇒ If

*i*

_{b}is plate current,

*e*

_{b}is plate voltage and

*e*

_{c}is grid voltage the

*v*-

*i*curve of a vacuum triode

0.5 and 1

- 2 and 1

30 and 1

30 and 1.5

⇒ The number of bits of information required to indicate the correct selection of 3 independent consecutive events out of 75 equally probable events is

6.23

18.69

10.46

24.92

⇒ Which mode has the minimum cutoff frequency in rectangular wave guides?

TE

_{11}

TE

_{10}

TE

_{01}

TE

_{20}

⇒ Bandwidth of an antenna is related with where Q is quality factor

Q ∝ B

Q ∝ 1/B

Q ∝ B

^{2}

Q ∝ 1/B

^{2}