Question is ⇒ A 300 Hz sound wave of intensity 20 dB is transmitted by a 1500 kHz radio wave by frequency modulation. It is seen that instantaneous frequency varies between 1500.2 kHz and 1499.8 kHz, 300 times a second. If the intensity of sound wave is 100 dB., Options are ⇒ (A) The instantaneous frequency variations will be between 1500.2 and 1499.8 kHz, 1500 times a second, (B) The instantaneous frequency variations will be between 1501 and 1499 kHz, 1500 times a second, (C) The instantaneous frequency variations will be between 1501 and 1499 kHz, 300 times a second, (D) The instantaneous frequency variations will be between 1501 and 1499 kHz, 60 times a second, (E) , Leave your comments or Download question paper.

Question is ⇒ A 300 Hz sound wave of intensity 20 dB is transmitted by a 1500 kHz radio wave by frequency modulation. It is seen that instantaneous frequency varies between 1500.2 kHz and 1499.8 kHz, 300 times a second. If the intensity of sound wave is 100 dB., Options are ⇒ (A) The instantaneous frequency variations will be between 1500.2 and 1499.8 kHz, 1500 times a second, (B) The instantaneous frequency variations will be between 1501 and 1499 kHz, 1500 times a second, (C) The instantaneous frequency variations will be between 1501 and 1499 kHz, 300 times a second, (D) The instantaneous frequency variations will be between 1501 and 1499 kHz, 60 times a second, (E) , Leave your comments or Download question paper. Previous question Next question


Q1.	A 300 Hz sound wave of intensity 20 dB is transmitted by a 1500 kHz radio wave by frequency modulation. It is seen that instantaneous frequency varies between 1500.2 kHz and 1499.8 kHz, 300 times a second. If the intensity of sound wave is 100 dB.
A.	The instantaneous frequency variations will be between 1500.2 and 1499.8 kHz, 1500 times a second [Wrong Answer]
B.	The instantaneous frequency variations will be between 1501 and 1499 kHz, 1500 times a second [Wrong Answer]
C.	The instantaneous frequency variations will be between 1501 and 1499 kHz, 300 times a second [Correct Answer]
D.	The instantaneous frequency variations will be between 1501 and 1499 kHz, 60 times a second [Wrong Answer]
View Answer 1 -1 Explanation:- Answer : C Discuss it below : !! OOPS Login [Click here] is required to post your answer/result Help other students, write article, leave your comments

Previous question Next question

Also Read Similar Questions Below :

⇒ The slew rate of an ideal op-amp is
very slow
slow
fast
infinitely fast

⇒ V_R at t < T, t = &in
500e^-40x10⁴t, 0
100e^-40x10³t, 0
100e^-40x10⁶t, 0
100e^-40x10⁴t, 0

⇒ In the signal flow graph of the given figure, the number of forward path
1
2
3
4

⇒ If the secondary winding of CT is opened when primary coil is carrying current
transformer will burn immediately
there will be weak flux density in core
there will be very high induced voltage in secondary
there will be high current in secondary

⇒ For a Mod-64 synchronous counter the number of flip flops and AND gates needed is
6 and 4 respectively
4 and 6 respectively
7 and 5 respectively
5 and 7 respectively

⇒

Assertion (A): In C arithmetic operations are pemiissible on ints, floats and chars.

Reason (R): In C every arithmetic operator must be written explicitly.

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 correct R is wrong
A is wrong R is correct

⇒ Television transmission is by
ground waves
sky waves
space waves
all of the above

⇒ A system has its two poles on the negative real axis and one pair of poles lies on jω axis. The system is
stable
unstable
limitedly stable
either (a) or (c)

⇒ Both ROM and RAM can be accessed randomly.
TRUE
FALSE

⇒ Aperture circuit produces __________ in sample hold circuit.
the total sampling time
delay between the instance at which hold command is initiated and the instance at which O/P starts tracking I/P
the time taken by O/P to settle within the specified 1% error band, that of the I/P
time required by holding capacitor to reach upto the level close to input

⇒ A transmission line of characteristic impedance z₀ = 50 Ω. Phase Velocity = 2 x 10⁸ m/sec, and length l = 1 m is terminated by a load z₁ = (30 - j 40) ohms. The input impedance of the line for a frequency of 100 MHz will be
(30 + j x 40) Ω
(30 - j 40) Ω
(50 + j x 40) Ω
(50 - j 40) Ω

⇒ A high resistance was measured by loss of charge method. The voltmeter resistance was 10¹⁰ ohms. The calculation gave the value of unknown resistance as 0.8 x 10⁹ ohms. The true value of resistance is
0.8 x 10⁹ Ω
less than 0.8 x 10⁹ Ω
more than 0.8 x 10⁹ Ω
either (b) or (c)

⇒ The purpose of series quadrature windings in amplidyne is to
neutralize the effect of armature reaction
reduce commutation difficulties
increase the gain
increase response time

⇒ When ω_m is the modulation frequency in frequency modulation, the modulation index is proportional to
ω_m
ω²_m
1/ω_m
1/ω²_m

⇒ In transistor radio receivers the number of IF amplifier stages are
1
2
4
6

⇒ When we use RRC instruction once in 8085, the number is
multiplied by 2
divided by 2
multiplied by 4
divided by 4

⇒ A multilevel decoder is more costly as compared to single level decoder.
TRUE
FALSE

⇒ Wiedemann-Franz law correlates
electrical and thermal conductivities
electron arrangement in shells
temperature and photo electric emission
all of the above

⇒ Consider the following statements about advantages of phase discriminator over slope detector

Fewer tuned circuits
Greater limiting
Better linearity
Easy alignment

Which of the above are true?
1, 2, 3, 4
2, 3, 4
1, 2, 3
1, 3, 4

⇒ Is the interrupt-enable flag?
Low
High
Never
None

⇒ The radiation pattern of Hertzian dipole in the plane perpendicular to dipole is a
null
circle
figure of eight
none of the above

⇒ The most common method for biasing a JFET is
reverse bias
self bias
voltage divider bias
none of the above

⇒ In paramagnetic materials
permanent magnetic dipoles exist but the interaction between neighbouring dipoles is negligible
permanent magnetic dipole do not exist
permanent magnetic dipoles exist and the interaction between neighbouring dipoles is very strong
permanent magnetic dipole moment may or may not exist

⇒ The 8085 microprocessor is interrupted while executing MOV instruction at location 0210 H. What is the location at which contents of register D are stored
054 CH
054 DH
054 EH
054 FH

⇒ There are four different algorithms A1, A2, A3 and A4 to solve, a given problem with the complexity order log(n), log(log(n)), n log and n/log(n) respectively. Which is the best algorithm?
A1
A2
A3
A4

⇒ Transformer coupling is mostly used in
RF amplifier
audio amplifier
both audio and RF amplifier
none of the above

⇒ If the current in a capacitor leads the voltage by 80°, the loss angle of capacitor is
80°
10°
100°
170°

⇒

Assertion (A): The velocity factor of a line is the ratio of wave velocity on the line to speed of light.

Reason (R): If the conductors of a line are immersed in a non magnetic insulating liquid, the wave velocity increases.

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 correct but R is wrong
A is wrong but R is correct

⇒ The main advantage of TDM over FDM is that it
needs less power
needs less bandwidth
needs simple circuitry
gives better S/N ratio

⇒ Choose the correct statement
The reflection coefficient (r) of a transmission line is greater than 1
r varies from 0 to ∞
r is less than or equal to 1
r varies from - ∞ to + ∞