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A waveguide operated below cut off frequency can be used as | |
A. | phase shifter [Wrong Answer] |
B. | an attenuator [Correct Answer] |
C. | an isolator [Wrong Answer] |
D. | none [Wrong Answer] |
View Answer
Explanation:-
Answer : B Discuss it below : !! OOPS Login [Click here] is required to post your answer/result |
Also Read Similar Questions Below :
⇒ In household energy meters the flux of series magnet is in phase with current but the flux of shunt magnet lags the voltage by 88°. The reading of energy meters
will be correct
will have a negative error
will have a positive error
may have positive or negative error
⇒ A parity detector can detect
single error only
single error or odd number of errors
two errors
single or two errors
⇒ Which of the following measurements using a dc potentiometer do not require standardisation of potentiometer?
Measurement of unknown voltage
Measurement of resistance
Measurement of unknown current
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⇒ Consider the following statements regarding sources or error in a Q-meter:
1, 2 and 3
1 and 2 only
2 and 3 only
1 and 3 only
⇒ Lead mounting for SCR is used for
rating less than mA
rating about 1 A or less
rating of 20 A or less than 20 A
rating 100 A or less
⇒ The function to Calculate the maximum value in the specified field of a database is
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MAX
DBMAX
⇒ The resistance of resistance strain gauge is about
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50 Ω
120 Ω
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⇒ 10 in BCD code represent
10100
1100
10111
None of the above
⇒ In radar system if the antenna diameter is increased by a factor of 4, the minimum range will increased by a factor of
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22
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0 or 1
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⇒ The modulation index is, if f_{m} = 500 Hz, Δf = 2.25 kHz
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9
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⇒ Which one of following is correct for broadside array?
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Also perpendicular to the plane
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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
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90°
45°
270°
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⇒ There is no radiation at right angles to the plane of the array, is end fire array.
TRUE
FALSE
⇒ The range of values of a and b for which the linear time invariant system with impulse respon
|a| > 1, |b| > 1
|a| < 1, |b| < 1
|a| < 1, |b| > 1
|a| > 1, |b| < 1
⇒ For the gate in the given figure the output wil
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1
A
A
⇒ Which one of the following is a regulated power supply?
IC 555
IC 844
IC 3080
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⇒ It is known that noise phase modulates the FM wave. As the noise side band frequency approaches the carrier frequency, the noise amplitude
will increase
will decrease
will remain constant
will reduce to negligible value
⇒ The upper and lower side frequencies for 3 kHz audio modulation with a 27 MHz carrier frequency will be
30 and 24 MHz
27.3 and 26.7 MHz
27.3 and 26.97 MHz
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⇒ A signal occupies a band 5 kHz to 10 kHz. For proper error free reconstruction at what rate it should be sampled?
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20 kHz
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⇒ Consider the following statemen
1, 2, 3, 4
1, 2, 3
1, 2
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⇒ The unit of loudness is
phon
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⇒ A rectangular waveguide having TE_{10} mode as dominant mode is having a cut off frequency of 18 GHz for the TE_{30} mode. The inner broad wall dimension of the rectangular waveguide is
5/3 cm
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⇒ Consider the following reasons for using antenna coupler
1, 2, 3
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⇒ Periodic recharging of the memory cells at regular intervals of 3 to 8 millisecond is required in a
ROM
Static RAM
Dynamic RAM
PLA
⇒ The impulse response of discrete time system is x[n] = (4)^{n} ∪[3 - n], the system is
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stable
stable and casual
stable and non-casual
⇒ For a wave propagating in air filled rectangular waveguide.
guide wavelength is never less than free space wavelength.
wave impedance is never less than the free space impedance
TEM mode is possible if the dimension of the waveguide are properly chosen.
propagation constant is a real quantity.
⇒ Which instrument is based on induction principle?
Dynamometer wattmeter
Induction wattmeter
Energy meter
Both (b) and (c)
⇒ Which of the following is the poorest conductor of electricity?
Aluminium
Nichrome
Copper
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⇒ In household energy meters the flux of series magnet is in phase with current but the flux of shunt magnet lags the voltage by 88°. The reading of energy meters
will be correct
will have a negative error
will have a positive error
may have positive or negative error
⇒ A parity detector can detect
single error only
single error or odd number of errors
two errors
single or two errors
⇒ Which of the following measurements using a dc potentiometer do not require standardisation of potentiometer?
Measurement of unknown voltage
Measurement of resistance
Measurement of unknown current
Calibration of voltmeter
⇒ Consider the following statements regarding sources or error in a Q-meter:
- If a coil with resistance R is connected in direct measurement mode and if the residual resistance of Q-meter is 0.1 R, then the measure Q of the coil would be 1.1 times the actual Q.
- If the inductance to be measured is less than 0.1 mH, the error due to presence of residual inductance cannot be neglected.
- The presence of distributed capacitance in a coil modifies the effective Q of the coil.
1, 2 and 3
1 and 2 only
2 and 3 only
1 and 3 only
⇒ Lead mounting for SCR is used for
rating less than mA
rating about 1 A or less
rating of 20 A or less than 20 A
rating 100 A or less
⇒ The function to Calculate the maximum value in the specified field of a database is
DM
DMAX
MAX
DBMAX
⇒ The resistance of resistance strain gauge is about
5 Ω
50 Ω
120 Ω
0.5 Ω
⇒ 10 in BCD code represent
10100
1100
10111
None of the above
⇒ In radar system if the antenna diameter is increased by a factor of 4, the minimum range will increased by a factor of
1
2
22
4
⇒ The input to a parity detector is 1001. The output is
0
1
0 or 1
indeterminate
⇒ The modulation index is, if f_{m} = 500 Hz, Δf = 2.25 kHz
2.25
4.5
9
18
⇒ Which one of following is correct for broadside array?
Direction of radiation is perpendicular to axis
Also perpendicular to the plane
Current is fed of equal amplitude equal phase
All
⇒ 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
⇒ For a system to work, as oscillator the total phase shift of the loop gain must be equal to
90°
45°
270°
360°
⇒ There is no radiation at right angles to the plane of the array, is end fire array.
TRUE
FALSE
⇒ The range of values of a and b for which the linear time invariant system with impulse respon
|a| > 1, |b| > 1
|a| < 1, |b| < 1
|a| < 1, |b| > 1
|a| > 1, |b| < 1
⇒ For the gate in the given figure the output wil
0
1
A
A
⇒ Which one of the following is a regulated power supply?
IC 555
IC 844
IC 3080
IC 723
⇒ It is known that noise phase modulates the FM wave. As the noise side band frequency approaches the carrier frequency, the noise amplitude
will increase
will decrease
will remain constant
will reduce to negligible value
⇒ The upper and lower side frequencies for 3 kHz audio modulation with a 27 MHz carrier frequency will be
30 and 24 MHz
27.3 and 26.7 MHz
27.3 and 26.97 MHz
27.3 and 26.97 MHz
⇒ A signal occupies a band 5 kHz to 10 kHz. For proper error free reconstruction at what rate it should be sampled?
10 kHz
20 kHz
5 kHz
(10 + 5) x 2 kHz
⇒ Consider the following statemen
1, 2, 3, 4
1, 2, 3
1, 2
1, 3, 4
⇒ The unit of loudness is
phon
sone
decibel
mel
⇒ A rectangular waveguide having TE_{10} mode as dominant mode is having a cut off frequency of 18 GHz for the TE_{30} mode. The inner broad wall dimension of the rectangular waveguide is
5/3 cm
5 cm
5/2 cm
10 cm
⇒ Consider the following reasons for using antenna coupler
- To prevent illegal radiation of spurious frequencies
- To tune out reactive components of antenna impedance
- To have correct value of load impedance for transmitter.
1, 2, 3
1, 2
1 only
2, 3
⇒ Periodic recharging of the memory cells at regular intervals of 3 to 8 millisecond is required in a
ROM
Static RAM
Dynamic RAM
PLA
⇒ The impulse response of discrete time system is x[n] = (4)^{n} ∪[3 - n], the system is
casual
stable
stable and casual
stable and non-casual
⇒ For a wave propagating in air filled rectangular waveguide.
guide wavelength is never less than free space wavelength.
wave impedance is never less than the free space impedance
TEM mode is possible if the dimension of the waveguide are properly chosen.
propagation constant is a real quantity.
⇒ Which instrument is based on induction principle?
Dynamometer wattmeter
Induction wattmeter
Energy meter
Both (b) and (c)
⇒ Which of the following is the poorest conductor of electricity?
Aluminium
Nichrome
Copper
All of the above