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Q1. | Which of the following is not used as a microwave mixer or detector? |

A. | PIN diode [Correct Answer] |

B. | Crystal diode [Wrong Answer] |

C. | Schottky barrier diode [Wrong Answer] |

D. | Backward diode [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 :**

⇒ For an R-C impedance function, the residues at all poles are

real

imaginary

real and positive

positive

⇒ RF amplifiers are used in radio receivers for

improved image frequency rejection

improved rejection of adjacent unwanted signals

prevention of re-radiation of the local oscillator through the antenna of the receiver

all of the above

⇒ The capacitor filter provides poor voltage regulation because

the increase in ripple with load current causes a decrease in average voltage

the increase in ripple with load current causes a increase in average voltage

filter promotes ripple at peak voltage

none of the above

⇒ Maximum rectification efficiency for a half wave rectifier is

1

0.88

0.5

0.406

⇒ At night D layer of ionosphere is absent.

TRUE

FALSE

⇒ As temperature increases, the temperature coefficient of a metal

decreases

increases

remains unchanged

any of the above

⇒ In a two terminals network the O.C. voltage measured at the given terminals is 100 V and s.c., currents at the same terminals 5 A. If a load of 80 Ω resistance is connected at the terminals, load current is

0.0416666666666667

1.25 A

0.25

6.25 A

⇒ The output

*y*(

*t*) of a continuous-time system

*S*for the input

*x*(

*t*) is given

S is linear and time-invariant

S is linear and time-varying

S is non-linear and time-invariant

S is non-linear and time-varying

⇒ It is possible to copy a file in the same directory.

TRUE

FALSE

⇒

Match the following:

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

A. | Poles and zeros of lie an real axis driving point LC network | 1. | lie an real axis |

B. | Canonic LC network has | 2. | a zero |

C. | The number of Canonic networks for the given driving point function | 3. | minimum number of elements |

D. | The first critical frequency nearest the origin for RL driving point impedance | 4. | four |

5. | minimum number of elements | ||

6. | alternate | ||

7. | either a pole or zero | ||

8. | three |

A-1, B-5, C-8, D-7

A-6, B-5, C-3, D-2

A-1, B-5, C-4, D-2

A-1, B-3, C-4, D-7

⇒ If zeros at infinity are included in the count, the number of zeros of G(

*s*) H(

*s*) is

equal to number of poles

one more than the number of poles

one less than the number of poles

none of the above

⇒ In p mode of operation of magnetron the spikes due to phase focussing effect rotate at an angular velocity corresponding to

one pole/cycle

two pole/cycle

four pole/cycle

six pole/cycle

⇒ Television transmission is by

ground waves

sky waves

space waves

all of the above

⇒ Figure shows the self bias circuit for CE amplifier and its equivalent circuit. V

_{BB}and R

_{B}respectively

10 V and 4 k ohm

5 V and 4 k ohm

2 V and 4 k ohm

2 V and 10 k ohm

⇒ The Boolean function realized by the logic circuit show

F = Σ

*m*(0, 1, 3, 5, 9, 10, 14)

F = Σ

*m*(2, 3, 5, 7, 8, 12, 13)

F = Σ

*m*(1, 2, 4, 5, 11, 14, 15)

F = Σ

*m*(2, 3, 5, 7, 8, 9, 12)

⇒ At the peak of negative half cycle in fi

diode A is forward biased and diode B is reverse biased

both diodes are reverse biased

both diodes are forward biased

diode A is reverse biased and diode B is forward biased

⇒ For the system of the given figure, the damping ratio of closed loop pole

1.5

1

0.5

0.25

⇒ Which of the following is correct for a driving point functions?

The real parts of all poles must be negative

The real parts of all poles and zeros must be negative

The real parts of all poles and zeros must be negative or zero

The real parts of all zeros must be negative

⇒ For plane wave propagating in free space or two conductor transmission line, what must be the relationship between the phase velocity

*v*, the group velocity

_{p}*v*and speed of light

_{g}*c*?

*v*>

_{p}*c*>

*v*

_{g}*v*<

_{p}*c*<

*v*

_{g}*v*=

_{p}*c*=

*v*

_{g}*v*<

_{p}*v*<

_{g}*c*

⇒

Match the following:

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

A. | Flash converter ADC | 1. | requires conversion time of a few μs |

B. | Dual slope ADC | 2. | requires DAC |

C. | Successive approximation ADC | 3. | minimizes the effect of power supply interference |

4. | requires complex hardware | ||

5. | is a tracking ADC |

A-2, B-3, C-4

A-4, B-3, C-2

A-5, B-4, C-3

A-1, B-2, C-5

⇒ Hydrogen is used in

large size transformers

MCB

large size generators

circuit breakers

⇒ Costa's receiver is used for

coherent detection of AM-SC signal

asynchronous detection of AM-SC signal

amplitude modulation of signal

frequency modulation of signal

⇒ In case of probability of the message is 1 to 16 then the information will be

16 bits

8 bits

4 bits

2 bits

⇒ In a reactance function

all poles are simple

all poles and zeros are simple

all poles and zeros are simple and lie on

*j*ω axis only

all poles and zeros lie on negative real axis

⇒ 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}

⇒ Which of the following can be accessed only sequentially?

Floppy disk

Hard disk

Magnetic tape

ROM

⇒ Mc Murray full bridge inverter uses

4 thyristors and 2 diodes

4 thyristors and 4 diodes

8 thyristors and 4 diodes

8 thyristors and 8 diodes

⇒ The resistance of the circuit shown is figur

5 Ω

More than 6 Ω

More than 4 Ω

Between 6 and 7 Ω

⇒ A dc network has 3 independent nodes and 4 loops. In total analysis, the number of equations is

4

3

2

1

⇒ In a class C power amplifier

resonant frequency of tuned circuit is equal to fundamental frequency of pulsed waveform

resonant frequency of tuned circuit is half the fundamental frequency of pulsed waveform

resonant frequency of tuned circuit has no relation to the fundamental frequency of pulsed waveform

either (b) or (c)