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Q1. | Which of the following types of noise assumes greater importance at high frequencies? |

A. | Transit time noise [Correct Answer] |

B. | Shot noise [Wrong Answer] |

C. | Impulse noise [Wrong Answer] |

D. | Random noise [Wrong Answer] |

View Answer
Explanation:-
Answer : ADiscuss 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 :**

⇒ Evaluate the value of 2 [

*u*(

*t*- 1) -

*u*(1 - 2

*t*)] (

*u*(

*t*+ 1) +

*u*(

*t*)) at

*t*= 3 sec.

0

4

∞

1

⇒ The wave propagation occurs without attenuation in case of a

conductor

semiconductor

perfect dielectric

none of the above

⇒ To protect an SCR against high

*di*/

*dt*we connect

a capacitance in series with SCR

a capacitance in parallel with SCR

an inductance in parallel with SCR

an inductance in series with SCR

⇒ Which of the following statements is not correct for thermistors?

They have negative temperature coefficient of resistance

The sensing element is made of sintered ceramics, which are oxides of metals in the form of beads

The variation of resistance with temperature is linear

The resistance value at ambient temperature may range from 100 Ω to 100 kΩ

⇒ For the truth table of the given figure

A + B + C

A + BC

A

B

⇒ The intrinsic carrier concentration of silicon sample at 300 K is 1.5 x 10

^{16}/m

^{3}. If after doping, the number of majority carriers is 5 x 10

^{20}/m

^{3}. The minority carrier density is

4.5 x 10

^{11}/m

^{3}

3.33 x 10

^{4}/m

^{3}

5 x 10

^{20}/m

^{3}

3 x 10

^{-5}/m

^{3}

⇒ An unmodulated voltage 10

*V*effective is applied to a dioxide detector in which load resistance is 4 x 10

^{-5}ohms. A micrometer shows that the rectified DC current in this resistance is 30

*A*. The efficiency of detection is

0.34

0.555

0.688

0.847

⇒ Binary number 101101 when converted to its 2's complement will become

101.01

100.1

100.1

101.1

⇒ In a fascimile reproduction time to scan one line is 2 ms. If it has 4% blanking, the visible trace time is

1.92 ms

2.08 ms

50 ms

0.08 ms

⇒ The function A

*e*where

^{st}*s*= s +

*j*ω represents

A phasor whose magnitude changes with time

A phasor whose frequency is ω

A phasor rotating in counterclockwise direction at angular frequency ω and whose magnitude increases with

*t*

A phasor rotating in clockwise direction at angular frequency ω and whose magnitude increases with

*t*

⇒ When analysing two port networks in parallel it is more convenient to use

*z*parameters

*h*parameters

T parameters

*y*parameters

⇒ The signal m(

*t*) = 10 cos 100 p

*t*is sampled at the rate of F

_{s}= 75 H

_{z, }then determine signal after sampling.

4 cos 100 p

*t*+ 8 sin 200 p

*t*

4 cos 100 p

*t*+ 8 sin 200 p

*t*+ cos 75 p

*t*

4 cos 25 p

*t*+ 8 sin 50 p

*t*+ cos 75 p

*t*

none

⇒ Calculate the directivity of an antenna for θ

_{E}= 30°, θ

_{H}= 60

46

23

50

100

⇒ Mark out the WRONG statem

Needs very high-speed burst modems

Faces no problems caused by intermodulation of carriers so that transponder can be used at its full power

Needs high-speed manipulation of bit streams

Is less flexible so that channels of widely different capacities cannot used and intermixed

⇒ If the changes in zener current in a voltage regulator circuit are too large, it can be corrected by using a

emitter follower

CE amplifier

capacitor

either (a) or (b)

⇒ A series circuit has R = 5 Ω and C = 10 μF. It is switched on to a 12 V dc battery at

*t*= 0. The current in the circuit will be maximum

at

*t*= RC

at

*t*= ∞

at

*t*= 0

^{+}

none of the above

⇒ The voltage

*e*

_{0}in the fi

48 V

24 V

36 V

28 V

⇒ In 8085 microprocessor, how many I/O ports can be accessed by memory mapped method?

8

256

32 K

64 K

⇒ Which of the following has a major role in implementation of functions calls in C?

Processor's registers

Data segment

The heap

System stack

⇒ Which of the following is known as insulated gate FET?

JFET

MOSFET

Both JFET and MOSFET

None of the above

⇒ If I = J = K = 13, then in Fortran 1 = 10 - (1 / 10) * 10 + (J / 5) * 4 + K ** (- 2) is equal to

8

7

6

5

⇒ Which one is digital modulation technique?

AM

PAM

PCM

None

⇒ In ferromagnetic materials, the orientation between neighbouring permanent dipoles is parallel.

TRUE

FALSE

⇒ Which of the following identifiers is invalid in Pascal?

` BETA`

`MAX 40`

`2ND`

`A MAX`

⇒ The value of VSWR is taken as ∞ when the line is

short-circuited

open-circuited

terminated with full load

terminated with load equal to the characteristic impedance of the load

⇒ A first-order system has a time constant t. For unit ramp input, the steady state error is

t

^{2}

t

t

1/t

⇒ As per Shannon-Hartley theorem, a noise less Gaussian channel has

zero capacity

infinite capacity

small capacity

none of the above

⇒

Match the following:

List I (μP) | List II (Number of bits in register) | ||
---|---|---|---|

A. | 8085 | 1. | 32 bit |

B. | 8086 | 2. | 16 bit |

C. | 68000 | 3. | 8/16 bit |

A-1, B-2, C-3

A-2, B-3, C-1

A-3, B-2, C-1

A-3, B-1, C-2

⇒ In figure (A) and

A represents PCM and B represents AM

A represents FM and B represents AM

A represents AM and B represents FM

A represents PCM and B represents FM

⇒ Under identical conditions, for a single modulating frequency, FM and PM are indistinguishable. Now if the modulating frequency is reduced, then

phase modulation index as well as frequency modulation index decrease

phase modulation index as well as frequency modulation index increase

phase modulation index will remain constant whereas frequency modulation index will increase

phase modulation index will decrease whereas frequency modulation index will remain constant