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Q1. | Which of the following should be used in order to prevent overloading or the last IF amplifier in a receiver? |

A. | Variable selectivity [Wrong Answer] |

B. | Variable sensitivity [Correct Answer] |

C. | Double conversion [Wrong Answer] |

D. | Squelch [Wrong Answer] |

View Answer
Explanation:-
Answer : BDiscuss 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 :**

⇒ The method of frequency compensation in moving iron voltmeter is

to use a capacitor in series with coil

to connect a capacitor in parallel with coil

to connect a capacitor in parallel with series resistance

none of the above

⇒ A 12 bit ADC is operating with 1 μs clock period. Total conversion time is 14 μs. ADC is

flash type

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integrating type

successive approximation type

⇒ In

*p*-

*n*-

*p*transistor the current I

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*n*-region and I

_{E}due to injection of electrons from

*n*-region to

*p*-region. Then

I

_{Ep}and I

_{En}are almost equal

I

_{Ep}>> I

_{En}

I

_{En}>> I

_{Ep}

either (a) or (c)

⇒ Modulation index of a AM wave is measured using oscilloscope. The display on the CRO is as shown in figure it can be concluded t

the output wave is distorted

the output wave is under modulated

the modulation index is 100%

the modulation index is 50%

⇒ All inverters use forced commutation.

TRUE

FALSE

⇒ A RADAR can be used to

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to direct guided missiles

to search submarines

all of the above

⇒ In a JFET

drain current is very nearly equal to source current

drain current is much less than source current

drain current may be equal to or less than source current

drain current may be even more than source current

⇒

**Assertion (A):** Power loss in a conductor of resistance P = I^{2}R.

**Reason (R):** When a conductor is carrying current with current density J as a result of applied field E, then heat developed/m^{3}/ second = JE.

Both A and R are true and R is correct explanation of A

Both A and R are true but R is not correct explanation of A

A is true but R is false

A is false but R is true

⇒ Consider the following tasks in a micro computer

- Receiving data and instruction
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2 only

2 and 3 only

1, 2 and 3 only

All

⇒ A two-input OR gate is designed for positive logic. However, it is operated with negative logic. The resulting logic operation will then be

OR

AND

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EX-OR

⇒ Mc Murray full bridge inverter uses

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4 thyristors and 4 diodes

8 thyristors and 4 diodes

8 thyristors and 8 diodes

⇒

Match the following:

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

A. | Copper | 1. | produces discrete energy level just above valence band |

B. | Rubber | 2. | produces discrete energy level just below conduction band |

C. | Antimony | 3. | large forbidden gap |

D. | Boron | 4. | valence and conduction bands overlap |

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

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

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

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

⇒ Which mode is called dominant mode in rectangular wave guide?

TE

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TE

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⇒ The impulse response

*h*(

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*h*(

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*u*(

*t*) + exp (β

*t*)

*u*(-

*t*), where

*u*(

*t*) denotes the unit step function, and a and β are constants. This system is stable if

a is positive and β is positive

a is negative and β is negative

a is positive and β is negative

a is negative and β is positive

⇒ A broadcast radio transmitter radiates 5 kW when the modulation percentage is 60. How much of this is carrier power?

6.66 kW

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4.9 kW

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⇒ In carbon resistor colour code, if the third band is of silver, it indicates

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tolerance is ± 5%

⇒

**Assertion (A):** A class C amplifier can also be used as frequency multiplier

**Reason (R):** When narrow current pulses drive a resonant circuit the output can be a near perfect sine wave

Both A and R are correct and R is correct explanation for A

Both A and R are correct but R is not correct explanation for A

A is correct R is wrong

A is wrong R is correct

⇒ Which stage generates RF carri

Amplifier

Oscillator

Power supply

All of the above

⇒ For the two ports in figure,

*y*

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*y*

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*y*

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*y*

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2, 6, 6 mho

2, 6, 0 mho

2, 0, 6 mho

2, 6, 8 mho

⇒ Cross-over distortion behaviour is a characteristic of

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class B output stage

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⇒ A linear diode detector uses RC filter. As modulation index increases the maximum permissible value of time constant RC

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either (a) or (c)

⇒ VTM stands for voltage tunable magnetron.

TRUE

FALSE

⇒ In an integrated circuit the SiO

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physical strength

isolation

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⇒ A function Z(

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

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-240 dB/decade

-280 dB/decade

-320 dB/decade

⇒ The units of F(

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TRUE

FALSE

⇒ A circuit using an op-amp is shown in the given figure. It

voltage series feedback

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current shunt feedback

current series feedback

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one half adder and 2 full adders

two half adders

one half adder and many full adders

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Lorentz rotation

Faraday rotation

Steinmitz rotation

Fleming's rotation