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The ability of a radio receiver to discriminate between different input signals and to accept only one definite signal is called its | |
A. | sensitivity [Wrong Answer] |
B. | attenuation [Wrong Answer] |
C. | selectivity [Correct Answer] |
D. | modulation [Wrong Answer] |
View Answer
Explanation:-
Answer : C Discuss it below : !! OOPS Login [Click here] is required to post your answer/result |
Also Read Similar Questions Below :
⇒ A TRIAC is a semiconductor device which acts as a
2 terminal unidirectional switch
2 terminal bidirectional switch
3 terminal bidirectional switch
4 terminal multidirectional switch
⇒ A Darlington pair has β = 300. If R_{E} = 1 kΩ and R_{L} = 100 Ω, the input impedance at the base is approximately
300 k ohm
3 k ohm
100 k ohm
30 k ohm
⇒ RF choke used for suppressing interference in TV is generally
honey comb wound coil
iron core coil
single layer coil
multilayer coil
⇒ In a 3 phase fully controlled converter the firing frequency is
3 times the line frequency
6 times the line frequency
9 times the line frequency
12 times the line frequency
⇒ In a 3 phase bridge inverter with 120° mode of operation the. number of thyristors conducting at one time are
1
2
3
4
⇒ In a Vidicon camera tube
grid G_{1} accelerates electrons
grid G_{2} accelerates electrons and grid G_{3}, slows down electrons
grid G_{3} accelerates electrons and grid G_{2} slows down electrons
both grids G_{2} and G_{3} accelerate electrons
⇒ If ω is the frequency of modulating voltage in FM, the modulation index is proportional to
ω
1/ω
ω
1/ω
⇒ If a = 0.995, I_{E} = 10 mA, I_{CO} = 0.5 mA, then I_{CEO} will be
100 μA
25 μA
10.1 μA
10.5 μA
⇒ A transmission line has a characteristic impedance of 50 Ω and a resistance of 0.1 Ω/m, if the line is distortion less, the attenuation constant (in Np/m) is
500
5
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0.002
⇒ In a pulsed RADAR typical value of pulse duration and pulse frequency respectively are
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4 μs and 500 Hz
⇒ The mean life time of the minority carriers is in the range of a few
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micro seconds
nano seconds
⇒
A-1, B-2, C-3, D-4
A-3, B-4, C-2, D-1
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A-4, B-3, C-2, D-1
⇒ For F_{2} layer the critical frequency is about
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100 MHz
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⇒ A transistor amplifier with 85% efficiency is expected to be
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class C
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⇒ If average correlation between v_{1}(t) and v_{2}(t) is R_{12}(t) and average correlation between v_{2}(t) and v_{1}(t) is R_{21}(t) then
R_{12}(t) = R_{21}(t)
R_{21}(t) = R_{12}(t)
R_{12}(t) = - R_{21}(t)
none of these
⇒ A full adder adds
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⇒ If f(t) is an even function, the coefficients F_{n} in the exponential form of Fourier series
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⇒ Pick the correct statement with respect to following fig
both the circuit are not identical filter Ckts
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⇒ The force required to initiate motion between two contacting surfaces is called
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⇒ 100101.1011_{2} = __________ .
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⇒ The number of spectral component of impulse wave is
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0
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⇒ The number of valence electrons in a silicon atom is
4
2
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⇒ Which of the following compensation method in amplifier can be used to reduce the bandwidth?
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⇒ In a circuit containing a complex impedance, maximum power transfer takes place when load is
pure resistance
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⇒ If figure, I = 2A if R = 20 Ω. When R = 10 Ω current I
0.0416666666666667
0.0833333333333333
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⇒ If f_{h}(t) is Hilbert transform of f(t), then Hilbert transform of f_{h}(t) is
-f(t)
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⇒ Dielectric loss due to polarisation occurs in
bipolar dielectrics
non-metallic dielectrics
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all of the above
⇒ When a single phase dual converter is operating in circulating current mode
both converters are working as rectifiers simultaneously
one converter is always working as rectifier and the other as inverter
only one converter is working at one time
both converters are either working as rectifiers or as inverters simultaneously
⇒
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
⇒ The ripple factor from a capacitor filter __________ as the load resistance __________ .
decreases, decreases
decreases, increases
increases, decreases
increases, increases
⇒ A TRIAC is a semiconductor device which acts as a
2 terminal unidirectional switch
2 terminal bidirectional switch
3 terminal bidirectional switch
4 terminal multidirectional switch
⇒ A Darlington pair has β = 300. If R_{E} = 1 kΩ and R_{L} = 100 Ω, the input impedance at the base is approximately
300 k ohm
3 k ohm
100 k ohm
30 k ohm
⇒ RF choke used for suppressing interference in TV is generally
honey comb wound coil
iron core coil
single layer coil
multilayer coil
⇒ In a 3 phase fully controlled converter the firing frequency is
3 times the line frequency
6 times the line frequency
9 times the line frequency
12 times the line frequency
⇒ In a 3 phase bridge inverter with 120° mode of operation the. number of thyristors conducting at one time are
1
2
3
4
⇒ In a Vidicon camera tube
grid G_{1} accelerates electrons
grid G_{2} accelerates electrons and grid G_{3}, slows down electrons
grid G_{3} accelerates electrons and grid G_{2} slows down electrons
both grids G_{2} and G_{3} accelerate electrons
⇒ If ω is the frequency of modulating voltage in FM, the modulation index is proportional to
ω
1/ω
ω
1/ω
⇒ If a = 0.995, I_{E} = 10 mA, I_{CO} = 0.5 mA, then I_{CEO} will be
100 μA
25 μA
10.1 μA
10.5 μA
⇒ A transmission line has a characteristic impedance of 50 Ω and a resistance of 0.1 Ω/m, if the line is distortion less, the attenuation constant (in Np/m) is
500
5
0.014
0.002
⇒ 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
⇒ The mean life time of the minority carriers is in the range of a few
seconds
milli seconds
micro seconds
nano seconds
⇒
Match the following:
List I (DOS commands) | List II (Meaning) | ||
---|---|---|---|
A. | ATTRIB | 1. | Displays all directories and subdirectories |
B. | SCAN DISK | 2. | Moves files to another director |
C. | MOVE | 3. | Checks the status of disc |
D. | TREE | 4. | Hides a file |
A-1, B-2, C-3, D-4
A-3, B-4, C-2, D-1
A-2, B-3, C-4, D-1
A-4, B-3, C-2, D-1
⇒ For F_{2} layer the critical frequency is about
500 MHz
100 MHz
25 MHz
10 MHz
⇒ A transistor amplifier with 85% efficiency is expected to be
class A
class B
class C
class AB
⇒ If average correlation between v_{1}(t) and v_{2}(t) is R_{12}(t) and average correlation between v_{2}(t) and v_{1}(t) is R_{21}(t) then
R_{12}(t) = R_{21}(t)
R_{21}(t) = R_{12}(t)
R_{12}(t) = - R_{21}(t)
none of these
⇒ A full adder adds
2 bits
3 bits
4 bits
any number of bits
⇒ If f(t) is an even function, the coefficients F_{n} in the exponential form of Fourier series
are real
are imaginary
are complex
may be real or imaginary
⇒ Pick the correct statement with respect to following fig
both the circuit are not identical filter Ckts
identical filter circuit at all frequencies
identical filter circuit at low frequency
identical filter circuit at high frequency
⇒ The force required to initiate motion between two contacting surfaces is called
coulomb friction
viscous friction
static friction
none of the above
⇒ 100101.1011_{2} = __________ .
115.22_{8}
115.54_{8}
215.54_{8}
100.01_{8}
⇒ The number of spectral component of impulse wave is
1
0
2
∞
⇒ The number of valence electrons in a silicon atom is
4
2
1
0
⇒ Which of the following compensation method in amplifier can be used to reduce the bandwidth?
Pole-zero compensation
Dominant pole compensation
Lead compensation
Any of the above
⇒ In a circuit containing a complex impedance, maximum power transfer takes place when load is
pure resistance
equal to the complex impedance
conjugate complex of the circuit impedance
none of the above
⇒ If figure, I = 2A if R = 20 Ω. When R = 10 Ω current I
0.0416666666666667
0.0833333333333333
2.5 A
0.125
⇒ If f_{h}(t) is Hilbert transform of f(t), then Hilbert transform of f_{h}(t) is
-f(t)
+f(t)
f^{2}(t)
f(t)
⇒ Dielectric loss due to polarisation occurs in
bipolar dielectrics
non-metallic dielectrics
liquid dielectrics
all of the above
⇒ When a single phase dual converter is operating in circulating current mode
both converters are working as rectifiers simultaneously
one converter is always working as rectifier and the other as inverter
only one converter is working at one time
both converters are either working as rectifiers or as inverters simultaneously
⇒
Assertion (A): A RAM with access time of the order of hundreds of nano seconds is suitable for a control memory.
Reason (R): The time taken to execute an operation in a microcomputer is critically de pendent on access time of control memory.
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
⇒ The ripple factor from a capacitor filter __________ as the load resistance __________ .
decreases, decreases
decreases, increases
increases, decreases
increases, increases