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Q1. | In a TV receiver the video IF amplifier provides a gain of about |

A. | 5 dB [Wrong Answer] |

B. | 20 dB [Wrong Answer] |

C. | 60 dB [Correct Answer] |

D. | 200 dB [Wrong Answer] |

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**Also Read Similar Questions Below :**

⇒ Q of a coil

- increases with Q increasing frequency
- varies linearly with frequency
- increase with increasing frequency because R increases at high frequency
- decrease after the peak frequency because R increases at H.F. the correct statements are

A, B

C, D

A, C

B, D

⇒ Consider the following statements about a magic tee

- The collinear arms are isolated from each other.
- On of the collinear arms is isolated from E arm.
- On of the collinear arms is isolated from H arm.
- E and H arms are isolated from each other.

1 and 2 are correct

1 and 3 are correct

1 and 4 are correct

2 and 3 are correct

⇒ The carrier frequency will be if L = 50 µH and C = 1 nF.

512

612 kHz

712 kHz

812 kHz

⇒ In most of instruments, the controlling torque is provided by

fluid fraction

spring

eddy current

either (a) or (c)

⇒ In case of synchro error detector the electrical zero position of control transformer is obtained when angular displacement between rotors is

zero

45°

90°

180°

⇒ For Ergodic Process

ensemble Average equal to time Average

ensemble Average is not equal to time Average

ensemble Average > Time Average

ensemble Average < Time Average

⇒ It is desired to evaluate the expression

`F = B * COS (Y) + C * SQR (COS (Y) + A * COS (Y) * COS (Y) * COS (Y)`

`F = B * COS (Y) + C * SQR [COS (Y)] + A * COS (Y) * SQR [COS (Y)]`

`F = B * COS (Y) + C * COS(Y) * COS (Y) + A * COS (Y) * COS (Y) * COS (Y)`

` X = COS(Y)`

⇒ The impurity commonly used for realizing the base region of a *n*-*p*-*n* transistor is

gallium

indium

boron

phosphorus

⇒ If *f*(- *t*) = *f*(*t*), the function *f*(*t*) has only cosine terms.

TRUE

FALSE

⇒ Induction wattmeter is an absolute instrument.

TRUE

FALSE

⇒ The integral of a unit impulse is unit step function.

TRUE

FALSE

⇒ Fourier transform pair are

autocorrelation and power spectral density

autocorrelation and convoloution

convolution and power spectral density

autocorrelation and energy

⇒ Match the following:

List I (Characteristic equation) List II (Degree of damping) A. *s*^{2} + 15*s* + 56.251. Undamped B. *s*^{2} + 5*s* + 62. Underdamped C. *s*^{2} + 20.253. Critically damped D. *s*^{2} + 4.55*s* + 42.254. Overdamped

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

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

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

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

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

4

3

2

1

⇒ Volt is equivalent to

joule/coulomb

joule/watt

joule/ampere

joule/volt

⇒ In a half bridge inverter each thyristor is gated at a frequency *f*. The output frequency is

2 *f*

*f*

0.5 *f*

0.25 *f*

⇒ In Schering bridge, the potential of detector above earth potential is about

a few volts

10 kV

1000 V

either (a) or (b)

⇒ A signal *m*(*t*) is multiplied by a sinusoidal waveform of frequency *f*_{c} such

0.5 M(*f* + *f*_{c})

0.5 M(*f* - *f*_{c})

0.5 M(*f* + *f*_{c}) + 0.5 M(*f* - *f*_{c})

0.5 M(*f* - *f*_{c}) + 0.5 M(*f* - *f*_{c})

⇒ In FM 'guard band' is provided

to limit upper frequency limit

to limit lower frequency limit

so that there is less adjacent channel interference

to limit transmitted power of a station

⇒ Which of the following is not an assembler directive in 8085?

D S

D B

D Q

E Q U

⇒ A 20 Ω resistor, a 1H inductor and 1μF capacitor are connected in parallel the combination is driven by a unit step current. Under the steady state, source current flows through

inductor

capacitor

resistor

all

⇒ If X = 1 in the logic equation [X + Z { Y + (Z + X Y)}] { X + Z (X + Y)} = 1, then

Y = Z

Y = Z

Z = 1

Z = 0

⇒ Electrostatic voltmeter is suitable only for low voltages.

TRUE

FALSE

⇒ A second-order band-pass active filter can be obtained by cascading a low pass second order section having cut off frequency *f*_{OH} with a high pass second order section having cut-off frequency *f*_{OL} provided

*f*_{OH} > *f*_{OL}

*f*_{OH} < *f*_{OL}

*f*_{OH} = *f*_{OL}

*f*_{OH} ≤ 1/2*f*_{OL}

⇒ Two similar coils have self inductance of 1 mH each. Coefficient of coupling is 0.5. The mutual inductance M is

0.25 mH

0.5 mH

0.707 mH

1 mH

⇒ In intrinsic semiconductor the increase in conductivity per degree increase in temperature is about

0.02

0.06

0.15

0.25

⇒ In figure gain bandwidth produc

200 Hz

200 MHz

200 kHz

2 MHz

⇒ Match the following:

List I (Theorems) List II (Property of Network) A. Reciprocity 1. Impedance matching B. Tellegen's 2. Bilateral C. Superposition 3. ∑ V_{jk} I_{jk} = 0 D. Maximum power transfer 4. Linear 5. Non linear

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

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

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

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

⇒ When modulation index of an AM wave is increased from 0.5 to 1, the transmitted power

remains the same

increases by 25%

increases by 33.3%

increases by 50%

⇒ Transient current in a loss free LC circuit when excited from an ac source is an __________ sine wave.

undamped

over damped

under damped

critically damped

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