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Q1. | The noise generated by a resistor depends upon |

A. | its operating temperature [Wrong Answer] |

B. | its resistance value [Correct Answer] |

C. | both (a) and (b) [Wrong Answer] |

D. | bandwidth [Wrong Answer] |

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

⇒ The characteristic equation of a control system is given as

*s*

^{4}+ 8

*s*

^{3}+ 24

*s*

^{2}+ 32

*s*+ K = 0. What is the range of values of K for this system to be stable?

0 ≤ K < 80

0 ≤ K < 100

0 ≤ K < 2300

0 ≤ K < 600

⇒ For very low frequencies, log magnitude for the given figur

0 dB

-3 dB

3 dB

10 dB

⇒ A minimum function has

poles and zeros on imaginary axis of

*s*plane

no poles or zeros on imaginary axis of

*s*plane

only poles but no zeros on imaginary axis of

*s*plane

only zeros but no poles on imaginary axis of

*s*plane

⇒ Which of the following is operating system?

MS WORD

Ventura

Java

Windows

⇒ In 8085 microprocessor, which of the following interrupts is unmaskable interrupts?

RST 5.5

RST 7.5

TRAP

INTR

⇒ The resistance of a 125 Ω strain gauge changes by 1 ohm for 4000 micro strain. The gauge factor is

1.5

2

2.5

3

⇒

*n*type semiconductors

are negatively charged

are produced when indium as impurity is added to germanium

are produced phosphorus as impurity is added to silicon

none of the above

⇒ A single phase electric heater uses phase controlled thyristors. The firing angle is 90°. The degree of heating is

25% of maximum

50% of maximum

75% of maximum

none of the above

⇒ The given figure shows dB magnitude plots for type 0, type 1 and type 2 systems. Out of t

curves 1, 2, 3 are for type 0, 1, 2 systems respectively

curves 1, 2, 3 are for type 2, 1, 0 systems respectively

curves 1, 2, 3 are for type 1, 0, 2 systems respectively

curves 1, 2, 3 are for type 1, 2, 0 systems respectively

⇒

Match the following:

List I | List II | ||
---|---|---|---|

A. | RC coupled amplifier | 1. | Very low drift |

B. | Tuned amplifier | 2. | Flat frequency response from zero frequency onwards |

C. | Chopper stabilized amplifier | 3. | Flat frequency response with upper and lower cut off frequency |

D. | DC amplifier | 4. | Peak in gain frequency response |

A-4, B-3, C-1, D-2

A-3, B-4, C-2, D-1

A-3, B-4, C-1, D-2

A-4, B-3, C-2, D-1

⇒ A system has 12 poles and 2 zeros. Its high frequency asymptote in its magnitude plot has a slope of

-200 dB/decade

-240 dB/decade

-280 dB/decade

-320 dB/decade

⇒

*i*

_{1}(

*t*) for

*t*> 0 is give

2.5 - 2.5

*e*

^{-2t}

2.5 - 1.25

*e*

^{-2t}

1.25 - 1.25

*e*

^{-2t}

None of these

⇒ Low frequency boost can be easily compensated by

attenuating the frequencies from 0 to 1.25 MHz

using an appropriate de-emphasis circuit in the receiver

using an appropriate pre-emphasis circuit in the transmitter

none

⇒ Which of the following could be the maximum current rating of junction diode by 126?

0.0416666666666667

0.416666666666667

20 A

100 A

⇒ A CW transmitter radiates

modulated RF carrier

unmodulated RF carrier

both (a) and (b)

none of the above

⇒ In the circuit of figure the switch is open for a long time, At

*t*= 0 the switch is closed. At

*t*= 0

^{+}the current supplied by batter

0.25

0.125

3.6 A

1.5 A

⇒ The output of a linear system for any input can be computed in which of the following ways?

Only by summation of inpulse response by convolution integral

Only by summation of step response by superposition integral

Neither a nor b

Either (a) or (b)

⇒ The FM broadcast band is from

550 to 1600 kHz

88 to 108 kHz

88 to 108 MHz

1600 kHz to 59.75 MHz

⇒ Bipolar IC memories are fabricated using

high density versions of the bipolar transistor flip-flop

low density versions of the unipolar transistor flip-flop

high density versions of the MOSFET

low density versions of the MOSFET

⇒ Two port circuits are connected in parallel. To determine the response, it is more convenient to use

O.C. impedance parameters

S.C. admittance parameters

ABCD parameters

*h*parameters

⇒ With on-chip decoding,

*n*address lines can access

2

*n*memory locations

2

*n*

^{2}memory locations

2

*memory locations*

^{n}*n*

^{2}memory location

⇒ In a 4 input AND gate, the total number of High outputs for 16 input states are

16

8

4

1

⇒ The characteristic equation for the next state (Q

_{n+1}) of a J-K flip-flop is

Q

_{n+1}= JQ

_{n}+ KQ

_{n}

Q

_{n+1}= JQ

_{n}+ KQ

_{n}

Q

_{n+1}= JQ

_{n}+ KQ

_{n}

Q

_{n+1}= JQ

_{n}+ KQ

_{n}

⇒ In a step down chopper using pulse width modulation, T

_{on}= 3 x 10

^{-3}and T

_{off}= 1 x 10

^{-3}s. The chopping frequency is

333.33

250

500

1000

⇒ A bit synchronizer regenerates at the receiver a clock waveform which is

synchronous with original clock waveform

out of phase by 180° with original clock waveform

out of phase by 90° with the original clock waveform

none of the above

⇒ The amount of photoelectric emission current depends on

frequency of incident radiation

intensity of incident radiation

both frequency and intensity of incident radiation

none of the above

⇒ To increase Q factor of a coil, the wire should be

long

thin

thick

long and thin

⇒ X and Y are two random variable and Z = X + Y. Let σ

_{x}^{2}, σ

_{y}^{2}and σ

_{z}^{2}be variance of X, Y and Z. Then

σ

_{z}^{2}= σ

_{x}^{2}+ σ

_{y}^{2}

σ

_{z}^{2}≤ σ

_{x}^{2}+ σ

_{y}^{2}

σ

_{z}^{2}< σ

_{x}^{2}+ σ

_{y}^{2}

σ

_{z}^{2}> σ

_{x}^{2}+ σ

_{y}^{2}

⇒ Dielectric constant and conductivity of rocky soil and flat sandy soil are around

10 and 20 mho/cm respectively

20 and 10 mho/cm respectively

2 and 5 mho/cm respectively

0.5 and 2 mho/cm respectively

⇒ Which of the following pairs are correctly matched?

- Brune's realisation : realisation with ideal transformer.
- Cauer realisation : ladder realisation.
- Bott Duffin realisation : with non ideal transformer.

1, 2 and 3

2 and 3

1 and 3

1 and 2