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Q1. | FM amplifier in a superheterodyne receiver |

A. | increases selectivity [Wrong Answer] |

B. | suppresses noise [Wrong Answer] |

C. | provides improved tracking [Wrong Answer] |

D. | improves the rejection of the image frequency [Correct Answer] |

View Answer
Explanation:-
Answer : DDiscuss 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 :**

⇒ In a 3 phase system, the zero sequence component of line to line voltages is zero

if line to line voltages are balanced

if line to line voltages are unbalanced

if line to line voltages are balanced or unbalanced

if degree of unbalanced in line to line voltages is small

⇒

`JCOKE`

8

11

16

20

⇒ In a single phase full wave ac regulator the firing angles during both half cycles are equal.

TRUE

FALSE

⇒ In 2's complement addition, the carry generated in the last stage is

added to LSB

neglected

added to bit next to MSB

added to the bit next to LSB

⇒ Which of the following theorems enables a number of voltage (or current) sources to be combined directly into a single voltage (or current) source?

Superposition theorem

Compensation theorem

Millman's theorem

Thevenin's theorem

⇒ 74 HC series can sink upto 4 mA. The 74 LS series has I_{IL(max)} - 0.4 mA. How many 74 LS inputs be driven by 74 HC output?

100

none

8

10

⇒ A transistor may fail due to

open weld at the wire leads to the semi-conductor

short circuit caused by momentary overloads

overheating due to circuit failures

any of the above

⇒ In dc tacho generators used for measurement of speed of shaft, frequent calibration is necessary because

contacts wear off

strength of permanent magnet decreases with age

armature current produces heating effect

there is back emf

⇒ The series element for a prototype high pass filter is

resistive

inductive

capacitive

combination of L and C

⇒ A pure tone at 1000 Hz has a dB level of 40 dB. If the required dB level is 100, the number of such tones is

2.5

60

10^{4}

10^{6}

⇒ If γ = (S_{0}/N_{0})/(S_{i}/N_{m}) where S_{0} and S_{1} are signal power output and signal power input and N_{0} and N_{m} are noise power output and noise power input, the value of γ for SSB-SC and DSB-SC amplitude modulated system respectively are

1 and 1

1 and 2

2 and 1

0.5 and 0.5

⇒ Charge needed within a unit sphere centred at the origin for producing a potential fie

12 p_{c}

60 p_{c}

120 p_{c}

180 p_{c}

⇒ In a minimum phase system

all poles lie in the left half plane

all zeros lie in the left half plane

all poles lie in the right half plane

all except one pole or zero lie in the left half plane

⇒ In a klystron amplifier dc electron velocity is *v*_{0} and dc electron charge density is r_{0} the dc beam current is

r_{0}*v*_{0}

r_{0}^{/}*v*_{0}

*v*_{0}^{/}r_{0}

(*v*_{0}^{/}r_{0})^{2}

⇒ The number of variables in a function is odd and the number of minterms with even number of 0's are same as the number of minterms with odd number at 1's, the expression formed can be represented in __________ as well as __________ form.

Ex - OR, NOR

Equivalence, Ex - OR

AND, Coincidence

OR, Ex - OR

⇒ A heavily doped semiconductor exhibits a __________ such a device is called sensistors.

negative temperature coefficient of resistance

positive temperature coefficient of resistance till a particular value of temperature and then it shown negative temperature coefficient of resistance

positive temperature coefficient of resistance

none of the above

⇒ The maximum usable frequency for the 'E' layer is 10 MHz.

TRUE

FALSE

⇒ Brownian motion is

random emission of electrons in vacuum tubes

thermal motion of electrons in a resistance

random diffusion of holes and electrons in semi- conductors

both (b) and (c)

⇒ An ammeter has a resistance of 50 ohms and a shunt of 0.01 Ω. The deflection is θ. If the shunt resistance is increased to 0.02 Ω, the deflection will be.

θ

2θ

0.5θ

0.25θ

⇒ The typical squelch circuit

cuts off IF amplifier when AGC is minimum

cuts off IF amplifier when AGC is maximum

cuts off audio amplifier when carrier is absent

eliminates RF interference when signal is weak

⇒ *c*(*t*) and *m*(*t*) are used to generate an AM signal. The modulation index of the generated AM signal is 0.5 then the quant

42737

42739

42738

42743

⇒ In analog signal given below is sampled at such a rate that the samples of signal can be given to a collection of buffers having capacity of either 24 samples/sec. or 25 samples/sec. The sampling rate is minimum such that it fully utilizes the collection of both types of buffers *m(t)* = 2 sin 480p*t* + 3 sin 720 p*t<*

600 H*z*

300 H*z*

1200 H*z*

2400 H*z*

⇒ Class-B amplifier has less efficiency compared to

class A

class B

class C

class A, AB and C

⇒ **Assertion (A):** The conditions under which it is possible to write Fourier series of a periodic function are called Drichlet conditions.

**Reason (R):** If *f*(*t*) = - *f*(- *t*), it is refereed to as odd symmetry.

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

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

A is true, R is false

A is false, R is true

⇒ The emf of a Weston cell is 1.286 V.

TRUE

FALSE

⇒ A coaxial RF cable has a characteristic impedance of 50 Ω and C equal to 40 pF/m. The inductance is

1 μ H/m

10 μ H/m

0.1 μ H/m

0.01 μ H/m

⇒ In the above case, what will be the value of capacitor to obtain 100 kHz frequency?

0.0065 pF

0.0130 pF

0.0260 pF

0.520 pF

⇒ The advantages of flash memory over EEPROM are

higher density

lower cost

both higher density and lower cost

none of the above

⇒ The total power radiated from an antenna system is determined by imagining that the antenna is at the centre of a very large

sphere

rectangle

square

ellipse

⇒ Watthour meter is an integrating instrument

TRUE

FALSE

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