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A pre-emphasis circuit provides extra noise immunity by | |
A. | converting the phase modulation to frequency modulation [Wrong Answer] |
B. | pre-amplifying the whole audio band [Wrong Answer] |
C. | boosting the base frequencies [Wrong Answer] |
D. | amplifying the higher audio frequencies [Correct Answer] |
View Answer
Explanation:-
Answer : D Discuss it below : !! OOPS Login [Click here] is required to post your answer/result |
Also Read Similar Questions Below :
⇒ When a plane wave travelling in free space is incident normally on a medium having ε_{r} = 4.0, then fraction of power transmitted into the medium is given by
42956
42737
42738
42861
⇒
A-3, B-1, C-4, D-2
A-2, B-1, C-4, D-2
A-3, B-2, C-1, D-4
A-4, B-3, C-1, D-2
⇒ It is possible to use a freewheeling diode in
single phase half wave controlled rectifier as well as in single phase full wave controlled rectifier (M - 2 connection)
single phase half wave controlled rectifier but not in single phase full wave controlled rectifier (M - 2 connection)
single phase full wave controlled rectifier (M - 2 connection) but not in single phase half wave controlled rectifier
all controlled rectifier circuits
⇒ Semiconductors have
aero temperature coefficient of resistance
positive temperature coefficient of resistance
negative temperature coefficient of resistance
none of the above
⇒ ROC of sequence x[n] = (3)^{n} ∪[n] + (4)^{n} ∪[- n - 1]
|z| > 4
3 < |z| < 4
|z| < 4
|z| > 3
⇒ Which one of the following circuits is used for converting a sine wave into a square wave?
Astable multivibration
Monostable multivibration
Bistable multivibration
Schmitt trigger
⇒ Consider the following features of 'structures' in C?
All
1 and 2 only
1 and 3 only
2 and 3 only
⇒ In molecules of ionic crystals, orientation polarization is zero.
TRUE
FALSE
⇒
Both A and R are true and R is correct explanation of A
Both A and R are true but R is not correct explanation of A
A is true R is false
A is false R is true
⇒ In the given figure shows a negative logic AND gate. If positive logic is used this gate is equivalen
AND gate
OR gate
NOR gate
NAND gate
⇒ Examine the following statements
3 only
2 and 3 only
1 and 3 only
2 only
⇒ If initial value of
X + Y
XY
X / Y
X - Y
⇒ In the field controlled motor the entire damping comes from
armature resistance
back emf
motor friction and load
field resistance
⇒ In figure, the power dissipated in 4 resistance is P_{1} and power associated with 3 A source is P_{2}.
P_{1} = P_{2}
P_{1} < P_{2}
P_{1} > P_{2}
P_{1} may be equal or less than P_{2}
⇒ The frequency at which magnitude of closed loop frequency response is 3 dB below its zero frequency value is called critical frequency.
TRUE
FALSE
⇒ Two 2's complement number having sign bits X and Y are added and the sign bit of the result is Z. then, the occurrence of overflow is indicated by the Boolean function.
XYZ
X Y Z
X YZ + XY Z
XY + YZ + ZX
⇒ The r.m.s. value of a half-wave rectified current is 100 A. Its value for full-wave rectification would be __________ amperes.
141.4
200
200/p
40/p
⇒ When iron rod is magnetised by the flowing through its coil, the polarities of its different points wil
Pole A is N-pole, B is S-pole and C is neutral
A is N, B and C is S
A is N, C is S
A is S, C is neutral, B is N
⇒ Decimal number 5436 when converted into 9's complement will become
4356
4653
4563
4655
⇒ If A = 7 ∠15, A^{2} is
49 ∠225°
49 ∠30°
49 ∠15°
49 ∠7.5°
⇒ In SSB generation, the most commonly used filter is
low pass
RC
LC
mechanical
⇒ Each term in POS form is called max terms.
TRUE
FALSE
⇒ In a 4 bit full adder how many half adders and OR gates are required
8 and 4
7 and 4
7 and 3
8 and 3
⇒ The electrochemical equivalent of a material
depends on its valency
depends on its atomic weight
depends on its valency and atomic weight
depends on the degree of hardness of the material
⇒ In the television system in India, each frame is scanned
100 times
50 times
20 times
10 times
⇒ If e = 10 sin(10^{8} t + 3 sin 10^{4} t) then the deviation is
4.77 kHz
47.7 kHz
477 kHz
4770 kHz
⇒ For class B operation the theoretical maximum efficiency is
1
0.785
0.5
0.275
⇒ The two conductors of a single phase transmission line suspended in air carry currents in opposite directions. The force per unit length on each conductor varies
directly as the current in either conductor
directly as the distance between the two conductors
directly as the square of the current in either conductor
inversely as the square of the distance between the two conductors
⇒ Costa's receiver is used for
coherent detection of AM-SC signal
asynchronous detection of AM-SC signal
amplitude modulation of signal
frequency modulation of signal
⇒ It is desired to evaluate the expression
⇒ When a plane wave travelling in free space is incident normally on a medium having ε_{r} = 4.0, then fraction of power transmitted into the medium is given by
42956
42737
42738
42861
⇒
Match the following:
List I | List II | ||
---|---|---|---|
A. | D Layer | 1. | 110 km |
B. | E layer | 2. | 10 km |
C. | F layer | 3. | 60 km |
D. | Troposphere | 4. | 350 km |
A-3, B-1, C-4, D-2
A-2, B-1, C-4, D-2
A-3, B-2, C-1, D-4
A-4, B-3, C-1, D-2
⇒ It is possible to use a freewheeling diode in
single phase half wave controlled rectifier as well as in single phase full wave controlled rectifier (M - 2 connection)
single phase half wave controlled rectifier but not in single phase full wave controlled rectifier (M - 2 connection)
single phase full wave controlled rectifier (M - 2 connection) but not in single phase half wave controlled rectifier
all controlled rectifier circuits
⇒ Semiconductors have
aero temperature coefficient of resistance
positive temperature coefficient of resistance
negative temperature coefficient of resistance
none of the above
⇒ ROC of sequence x[n] = (3)^{n} ∪[n] + (4)^{n} ∪[- n - 1]
|z| > 4
3 < |z| < 4
|z| < 4
|z| > 3
⇒ Which one of the following circuits is used for converting a sine wave into a square wave?
Astable multivibration
Monostable multivibration
Bistable multivibration
Schmitt trigger
⇒ Consider the following features of 'structures' in C?
- The values of a structure variable can be assigned to another structure variable of the same type using the assignment operator.
- One structure can be nested within another structure.
- A variable structure can also be passed to a function.
All
1 and 2 only
1 and 3 only
2 and 3 only
⇒ In molecules of ionic crystals, orientation polarization is zero.
TRUE
FALSE
⇒
Assertion (A): A photovoltaic cell is greatly affected by temperature.
Reason (R): Both germanium and silicon can be used for photovoltaic cells.
Both A and R are true and R is correct explanation of A
Both A and R are true but R is not correct explanation of A
A is true R is false
A is false R is true
⇒ In the given figure shows a negative logic AND gate. If positive logic is used this gate is equivalen
AND gate
OR gate
NOR gate
NAND gate
⇒ Examine the following statements
- Air and gases are compressible.
- Air, gases and some liquids are compressible.
- Oil can function as hydraulic fluid as well as lubricator.
3 only
2 and 3 only
1 and 3 only
2 only
⇒ If initial value of
PROD
is zero and a program adds X to PROD
, Y times we get the resultX + Y
XY
X / Y
X - Y
⇒ In the field controlled motor the entire damping comes from
armature resistance
back emf
motor friction and load
field resistance
⇒ In figure, the power dissipated in 4 resistance is P_{1} and power associated with 3 A source is P_{2}.
P_{1} = P_{2}
P_{1} < P_{2}
P_{1} > P_{2}
P_{1} may be equal or less than P_{2}
⇒ The frequency at which magnitude of closed loop frequency response is 3 dB below its zero frequency value is called critical frequency.
TRUE
FALSE
⇒ Two 2's complement number having sign bits X and Y are added and the sign bit of the result is Z. then, the occurrence of overflow is indicated by the Boolean function.
XYZ
X Y Z
X YZ + XY Z
XY + YZ + ZX
⇒ The r.m.s. value of a half-wave rectified current is 100 A. Its value for full-wave rectification would be __________ amperes.
141.4
200
200/p
40/p
⇒ When iron rod is magnetised by the flowing through its coil, the polarities of its different points wil
Pole A is N-pole, B is S-pole and C is neutral
A is N, B and C is S
A is N, C is S
A is S, C is neutral, B is N
⇒ Decimal number 5436 when converted into 9's complement will become
4356
4653
4563
4655
⇒ If A = 7 ∠15, A^{2} is
49 ∠225°
49 ∠30°
49 ∠15°
49 ∠7.5°
⇒ In SSB generation, the most commonly used filter is
low pass
RC
LC
mechanical
⇒ Each term in POS form is called max terms.
TRUE
FALSE
⇒ In a 4 bit full adder how many half adders and OR gates are required
8 and 4
7 and 4
7 and 3
8 and 3
⇒ The electrochemical equivalent of a material
depends on its valency
depends on its atomic weight
depends on its valency and atomic weight
depends on the degree of hardness of the material
⇒ In the television system in India, each frame is scanned
100 times
50 times
20 times
10 times
⇒ If e = 10 sin(10^{8} t + 3 sin 10^{4} t) then the deviation is
4.77 kHz
47.7 kHz
477 kHz
4770 kHz
⇒ For class B operation the theoretical maximum efficiency is
1
0.785
0.5
0.275
⇒ The two conductors of a single phase transmission line suspended in air carry currents in opposite directions. The force per unit length on each conductor varies
directly as the current in either conductor
directly as the distance between the two conductors
directly as the square of the current in either conductor
inversely as the square of the distance between the two conductors
⇒ Costa's receiver is used for
coherent detection of AM-SC signal
asynchronous detection of AM-SC signal
amplitude modulation of signal
frequency modulation of signal
⇒ 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)