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Q1. | The Gain margin for the system with open loop transfer functi |

A. | ∞ [Correct Answer] |

B. | 0 [Wrong Answer] |

C. | 1 [Wrong Answer] |

D. | -∞ [Wrong Answer] |

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

⇒ A carrier signal at frequency 100 MHz is frequency modulated with modulation index 2 by a signal at 2 kHz. At what frequencies are the sidebands produced?

102 MHz and 98 Mhz

100 MHz + 2 kHz, 100 MHz - 2 kHz

100 MHz ± Δ

*f*where

_{d}*f*is frequency deviation

_{d}100 MHz ± 3

*n*kHz, where

*n*is 1, 2, ... S integer

⇒ The output

*y*(

*t*) of a linear time invariant system is related to its input

*x*(

*t*) by the following equation

*y*(

*t*) = 0.5

*x*(

*t*-

*t*

*+ 1) +*

_{d}*x*(

*t*-

*t*

*) + 0.5*

_{d}*x*(

*t*-

*t*

*+ 7). The filter transfer function*

_{d}*H*(ω) of such a system is given by

(1 + cos ωt)

*e*

^{-jωt}

*d*

(1 + 0.5 cos ωt)

*e*

^{-jωt}

*d*

(1 + cos ωt)

*e*

^{jωt}

*d*

(1 - 0.5 cos ωt)

*e*

^{-jωt}

*d*

⇒ The output V-I characteristics of an Enhancement type MOSFET has

only an ohmic region

only a saturation region

an ohmic region at low voltage value followed by a saturation region at higher voltages.

an ohmic region at large voltage values. Preceded by a saturation region at lower voltages.

⇒ Turn on time of a transistor switch is equal to sum of (where

*t*

_{r}is rise time,

*t*

_{d}is delay time)

*t*

_{s}-

*t*

_{r}

*t*

_{s}-

*t*

_{f}

*t*

_{d}+

*t*

_{r}

2

*t*

_{r}

⇒ Transformer oil is

refined vegetable oil

refined mineral oil

mixture of vegetable and mineral oil

none of the above

⇒ To turn off an SCR, it is necessary to reduce its current to less than :

trigger current

holding current

breakover current

none of the above

⇒ In digital circuits Schottky transistors are preferred over normal transistors because of their

lower propagation delay

lower power dissipation

higher propagation delay

higher power dissipation

⇒ Energy = voltage x charge.

TRUE

FALSE

⇒ Of the various capacitances associated with a junction transistor the gain bandwidth product is affected to maximum extend by

base collector parasitic capacitor

base collector space charge layer capacitance

base emitter space charge layer capacitance

base emitter diffusion capacitance

⇒ Assuming that

*k*is an integer what would the result of following expression

8

7

7.5

zero

⇒ In satellite communication, highly directional antennas are used to

direct the spot beam to a particular region of space on Earth

strengthen the beam to overcome the cosmic noise

make corrections in change of polarisation of the beam

select a particular channel in transmission and reception

⇒ If a signal band limited for

*f*is sampled at a rate less than 2

_{m}*f*the reconstructed signal will be

_{m}smaller in amplitude

distorted

having higher frequencies suppressed

none of the above

⇒

Match the following:

List I (Memories) | List II (Characteristic) | ||
---|---|---|---|

A. | Static PLA | 1. | erasable, programmable |

B. | CCD | 2. | ultra high speed |

C. | ECL | 3. | stores large volume of data |

D. | GAL | 4. | Does not need refreshing |

5. | Non-volatile |

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

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

A-5, B-1, C-2, D-3

A-3, B-5, C-2, D-1

⇒ The number of operator to accomplish basic arithmetic in Java is

4

5

6

7

⇒ If a microcomputer has a 64 K memory; what is the hexadecimal notations for the last memory location?

1111

1A1A

EEEF

FFFF

⇒ The power gain of a half-wave dipole with respect to an isotropic radiator is

2.15 db

3 db

4.15 db

6 db

⇒ Two coils are connected in parallel. Their fluxes are adding. If the connections of one of the coils are reversed, the total inductance of the arrangement

will decrease

may increase or decrease

will remain the same

will increase

⇒ Loop antennas are mostly employed for direction finding (DF) purposes because they are small and hence portable.

TRUE

FALSE

⇒ Assuming a minimum angle of elevation of 5°, a geosynchronous satellite remains in line-of-sight for __________ percentage of Earth's surface.

30.3

42.4

50

25

⇒ The analog signal

*m*(

*t*) is given below

*m*(

*t*) = 4 cos 100 p

*t*+ 8 sin 200 p

*t*+ cos 300 p

*t*, the Nyquist sampling rate will be

1/100

1/200

1/300

1/600

⇒ Which of the following types of noise assumes greater importance at high frequencies?

Transit time noise

Shot noise

Impulse noise

Random noise

⇒ Value of Z

_{L}for maximum power transfe

R

R +

*j*ωL

R -

*j*ωL

None of these

⇒ The echo heard by a telephone user on a satellite channel can be removed by using

a vocoder

a multiplexer

echo suppressor

digital techniques

⇒ The magnetic moment in units of Bohr magneton of a ferrous ion in any ferrite is

zero

2

4

6

⇒ For matrix A, A

^{-1}A = 1

TRUE

FALSE

⇒ An antenna has a gain of 44 dB. Assuming that the main beam of the antenna is circular in cross-section the beamwidth will be

0.4456°

1.4456°

2.4456°

3.4456°

⇒

Match the following:

List I (Camera pick up tubes) | List II (Special feature) | ||
---|---|---|---|

A. | Vidicon | 1. | Highest sensitivity |

B. | Plumbicon | 2. | Temperature sensitive |

C. | Saticon | 3. | Large lag |

D. | New vicon | 4. | Special target for red response |

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

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

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

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

⇒ The skin depth of copper is found to be 66 mm at 1 MHz at a certain temperature. At the same temperature and at 2 MHz, the skin depth would be approximately

47 μm

33 μm

92 μm

1.22 μm

⇒ Accurate amplitude measurements can be made more easily than accurate phase shift measurements.

TRUE

FALSE

⇒ In high frequency region, an amplifier behaves like a

band pass filter

low pass filter

high pass filter

any of the above