Question is ⇒ The difference between phase and frequency modulation, Options are ⇒ (A) is purely of academic interest, (B) lies in the different definitions of the modulation index, (C) lies in the poor audio response of phase modulation, (D) is too great to make the two systems compatible, (E) , Leave your comments or Download question paper.

Question is ⇒ The difference between phase and frequency modulation, Options are ⇒ (A) is purely of academic interest, (B) lies in the different definitions of the modulation index, (C) lies in the poor audio response of phase modulation, (D) is too great to make the two systems compatible, (E) , Leave your comments or Download question paper. Previous question Next question


Q1.	The difference between phase and frequency modulation
A.	is purely of academic interest [Wrong Answer]
B.	lies in the different definitions of the modulation index [Correct Answer]
C.	lies in the poor audio response of phase modulation [Wrong Answer]
D.	is too great to make the two systems compatible [Wrong Answer]
View Answer 1 -1 Explanation:- Answer : B 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 :

⇒ In a pulsed RADAR typical value of pulse duration and pulse frequency respectively are
1 μs and 50 Hz
1 μs and 500 Hz
4 μs and 50 Hz
4 μs and 500 Hz

⇒ 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

⇒ At room temperature, the current in the, intrinsic semiconductor is due to
holes
electrons
ions
holes and electrons

⇒ For a wave v = V _1m sin (ωt + θ₁ ) - V_3m sin (3ωt + θ₃), the rms value is (0.5 V²_1m + 0.5 V²_3m)^0.5
TRUE
FALSE

⇒ Typical switching time for ECL is
5 nano seconds
5 micro seconds
5 milli seconds
5 seconds

⇒ In a pulsed RADAR, the transmitter is connected to the antenna
during pulse interval
during interval between pulses
all the time
only during a fraction of pulse interval

⇒ In a tape recorder the output from RF oscillator is given to
only erase head coil
only record head coil
coils of both erase head and record head
none of the above

⇒ The resistance of a standard conductor.
increases with frequency
same for ac and dc
increases with frequency
increases as square root of frequency

⇒ Figure of merit is always unity in
AM
SSB-SC
FM
All

⇒ A ramp input applied to a unity feedback system results in 5% steady state error. The type number and zero frequency gain of the system are respectively.
1 and 20
0 and 20
0 and 1/20
1 and 1/20

⇒ Pulse modulation is often used in
microwave band
FL band
telegraphy
telephony

⇒ In an n-type silicon crystal at room temperature, which of the following can have a concentration of 4 x 10¹⁹ cm^-3?
Silicon atoms
Holes
Dopant atoms
Valence electrons

⇒ Loudness control gives
high boost to bass and little boost to treble
equal boost to bass and treble
less boost to bass and more boost to treble
less boost to both bass and treble

⇒

Assertion (A): In a power divider S_H = 0, S₂₁ = 0.707 = S₃,

Reason (R): In a power divider the input port (i.e., port 1) is matched and incident power is equally divided in output ports 2 and 3

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 frame of an electric motor is earthed through three earthing plates resistances 30 Ω, 20 Ω and 10 Ω respectively. During fault the energy dissipated by three plates are W₁, W₂ and W₃. Then
W₁ > W₂ > W₃
W₁ < W₂ < W₃
W₁ = W₂ = W₃
W₁ + W₃ < W₂

⇒ The device most likely to be found in an SSB transmitter is
class C audio amplifier
tuned modulator
class B RF amplifier
class A RF amplifier

⇒ Double integration of unit step function leads to
an impulse
a parabola
a ramp
a doublet

⇒ Registers and counters are similar in the sense that they both
count pulses
store binary information
are made from an array of flip-flops and gates integrated on a single chip
are shift registers

⇒ For an illumination control circuit it is advisable to use a matched TRIAC-DIAC pair.
TRUE
FALSE

⇒ Consider the following statements as regards induction and dynamometer wattmeters

Dynamometer wattmeters can be used for dc only.
Induction wattmeter has higher torque and dynamometer wattmeter.
Induction wattmeter is less accurate, has more power consumption and more weight than dynamometer wattmeter.

Which of the above statements are correct?
1 only
1 and 2 only
2 and 3 only
1 and 3 only

⇒ For a npn BJT transistor f_β is 1.64 x 10⁸ Hz. C_μ = 10^-14 F; C_p = 4 x 10^-13 F and DC current gain is 90. Find f_T and g_m (f_β = cut off frequency, C_μ = capacitance, C_p = parasitic capacitance, g_m = transconductance, f_T = gain BW product)
f_T = 1.47 x 10¹⁰ Hz ; g_m = 38 milli mho
f_T = 1.64 x 10⁸ Hz ; g_m = 30 milli mho
f_T = 1.47 x 10⁹ Hz ; g_m = 38 mho
f_T = 1.33 x 10¹² Hz; g_m = 0.37 m-mho

⇒ For the circuit shown in the figure, the capacitor C is initially uncharged. At t = 0, the switch S is closed. The voltage V_c across the capacitor at t = 1 millisecond is (In the figure shown above, the op-amp is supplied with ± 15 V and the ground has been shown by the sym
0 V
6.3 V
9.45 volts
10 volts

⇒ The signal in 8086 are in minimum mode when
MN / Mx pin is tied to V_cc
MN / Mx pin is grounded
MN / MX pin is left open
none of the above

⇒ If B_max is the maximum flux density, eddy current loss is proportional to
B_max
B^1.6_max
B²_max
B³_max

⇒ A waveguide twist is used to change the plane of polarization.
TRUE
FALSE

⇒ An 8 level encoding scheme is used in a PCM system of 10 kHz channel BW. The channel capacity is
80 kbps
60 kbps
30 kbps
18 kbps

⇒ The most important set of specifications of transformer oil includes
dielectric strength and viscosity
dielectric strength and flash point
flash point and viscosity
dielectric strength, flash point and viscosity

⇒ What will happen to a bird sitting on a conductor?
It will die of shock
It will not die of shock because its claws are insulated
It will not die because it is insulated from earth and other conductors
None of the above

⇒ If V_a0, V_a1, V_a2 are sequence components of V_a and I_a0, I_a1, I_a2 are sequence components of I_a, then total 3 phase power P is given by
P = V_a0I_a0 + V_a1I_a1 + V_a2I_a2
P = V_a0I_a0 + V_a1I_a1 + V_a2I_a2^*
P = 3(V_a0I_a0 + V_a1I_a1 + V_a2I_a2)
P = 3(V_a0I_a0 + V_a1I_a1 + V_a2I_a2^*)

⇒ Which of the following does not cause losses in optical fibre cables?
Impurities
Microbending
Attenuation in glass
Stepped index operation