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Q1. | Superheterodyne receiver can be used in |

A. | AM [Wrong Answer] |

B. | FM [Wrong Answer] |

C. | SSB [Wrong Answer] |

D. | All of the above [Correct Answer] |

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

⇒ If the characteristic equation is (λ + 1) (λ + 2) (λ + 3) = 0, the eigen values are

-1, -2, -3

1, 2, 3

0, 1, 2

0, 2, 3

⇒ In Vidicon camera tube, the resistance of photoconductive material on the target plate

is constant

is more in darkness and less in brightness

is more in brightness but less in darkness and brightness

may be more or less in darkness and brightness

⇒ The response shown in figur

over damped

critically damped

under damped

either (a) or (c)

⇒ Consider the program segment written for 8085 based sys

41

69

44

Indeterminate

⇒ When the channel is noisy, producing a conditional probability of error

*p*= 0.5; the channel capacity and entropy function would be, respectively,

1 and 1

1 and 0.5

0.5 and 1

0 and 1

⇒ In

*n*channel JFET, the gate voltage is made more negative

the channel width will increase

the channel width will decrease

the channel width and drain current will decrease

the channel width will decrease and drain current will increase

⇒ Surface impedance at high frequencies is a consideration for

ferrites

semiconductors

good conductors

dielectrics

⇒ If a sound wave has a frequency of 50 Hz, the wavelength is

66 m

6.6 m

0.66 m

0.066 m

⇒ The resistivity of ferrites is

very much lower than that of the ferromagnetic metals

slightly lower than that of the ferromagnetic materials

slightly higher than that of the ferromagnetic metals

very much higher than that of the ferromagnetic metals

⇒

**Assertion (A):** The reverse current in a *p*-*n* junction is nearly constant.

**Reason (R):** The reverse breakdown voltage of a *p-n* diode depends on the extent of doping.

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

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

A is true but R is false

A is false but R is true

⇒ Find L

_{eq}if each L is

4/3 H

1/3 H

2/3 H

3/2 D

⇒ Narrow band FM signal can be represented as

A cos (2p

*f*) - β

_{c}t*A*sin (2p

*f*) sin (2p

_{c}t*f*)

_{m}tA cos (2p

*f*) - β

_{m}t*A*sin (2p

*f*) sin (2p

_{c}t*f*)

_{m}tA cos (2p

*f*) + β

_{c}t*A*sin (2p

*f*) sin (2p

_{c}t*f*)

_{m}tA cos (2p

*f*) + β

_{m}t*A*sin (2p

*f*) sin (2p

_{m}t*f*)

_{c}t⇒ Above a certain temperature, the specific heat of a metal becomes constant. This temperature is called

Debye temperature

Curie temperature

Neel temperature

Transition temperature

⇒ Words having 8 bits are to be stored into computer memory. The number of lines required for writing into memory are

1

2

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⇒ The pinch-off voltage is the drain voltage on the shorted gate drain curve above which the drain current becomes

almost negligible

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⇒ Multiplex techniques are used for

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low density point-to-point communications

high-density point-to-point communications

all of the above

⇒ If any term in the first column of a Routh array becomes zero, then

Routh criterion cannot be used to determine stability

Routh criterion can be used by substituting a small positive number for zero and completing the array

Routh criterion can be used by substituting a big positive number for zero and completing the array

Routh criterion can be used by substituting a small negative number for zero and completing the array

⇒ The unit of loudness is

phon

sone

decibel

mel

⇒ The difference between resonant commutation and self commutation is

both these methods are based on entirely different principles

in resonant commutation, the commutating elements carry load current but in self commutation, the commutating elements do not carry load current

resonant commutation uses L and C but self commutation uses only capacitor

none of the above

⇒ For a MOS capacitor fabricated on a P-type semiconductor, strong inversion occurs when

surface potential is equal to Fermi potential

surface Potential is greater than Fermi potential

surface potential is -

*ve*and equal to Fermi potential in magnitude

surface potential is +

*ve*and equal to twice the Fermi potential

⇒ In directional coupler of the given figure, the terms |

*S*

_{14}| and |

*S*

_{23}| of scattering matrix are ne

1 each

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0.1 each

1 and 0.5 respectively

⇒ To measure an emf by dc potentiometer it is necessary to standardise the potentiometer with the help of a standard cell.

TRUE

FALSE

⇒ Typical switching time for ECL is

5 nano seconds

5 micro seconds

5 milli seconds

5 seconds

⇒ Which one is correct option?

TEM mode exist in free space of infinite boundary

TEM mode exist in two conductor pattern system for finite-boundary

TEM mode exist in waveguide only

Both (a) and (b)

⇒ If

*f*is the frequency of electromagnetic wave,

*f*

*is cutoff frequency, then in a rectangular waveguide*

_{c}attenuation is low when

*f*>

*f*

_{c}attenuation is low when

*f*<

*f*

_{c}attenuation is high when

*f*<

*f*

_{c}either (b) or (c)

⇒ What is the frequency of pulse at the points

*a*,

*b*,

*c*in the circ

3 MHz

7.8 KHz

10 KHz

1 MHz

⇒ A 37 bit mantissa has an accuracy of

6 decimal places

8 decimal places

10 decimal places

11 decimal places

⇒ In figure V

_{i}may vary from 15 to 20 V and load current may vary from 20 mA to 100 mA. Suitable maximum value of

20 Ω

50 Ω

100 Ω

200 Ω

⇒ An engineer designs an amplifier to have a voltage gain of 60, but when constructed it only had a gain of 50. What value of feedback will double the gain?

0.005

0.0066

0.01

0.033

⇒ The poles with greater displacement from the real axis correspond to

higher frequencies of oscillations

stable response

lower frequencies of oscillations

unbounded output