Users Also Read
MCQ's Search Engine
Electrical Engineering
Mechanical Engineering
Civil Engineering
Automobile Engineering
Chemical Engineering
Computer Engineering
Electronics Engineering
Medical Science Engg
In the design of a single mode step index optical fiber close to upper cut-off, the single mode operations is NOT preserved if | |
A. | radius as well as operating wavelength are halved [Wrong Answer] |
B. | radius as well as operating wavelength are doubled [Correct Answer] |
C. | radius is halved and operating wavelength is doubled [Wrong Answer] |
D. | radius is doubled and operating wavelength is halved [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 :
⇒ A 16 bit binary adder has
16 half adders
16 full adders
one half adders and 15 full adders
8 half adders and eight full adders
⇒ An S/N ratio of 3 expressed in db is
4.8 dB
2.4 dB
0.48 dB
0.24 dB
⇒ Find the value of i_{x} if each resistance is of 3 Ω and each battery is of
1.1428 V
1.432 A
0.2892 A
O A
⇒ A signal x(n) = sin(ω_{0}n + φ) is the input to a linear time invariant system having a frequency response H(e^{jω}) If the O/P of the system is Ax(n -n_{0}), then the general form of H(e^{jω}) will be
- n_{0}ω_{0} + β for any arbitrary real β
- n_{0}ω_{0} + 2pk for any arbitrary integer k
n_{0}ω_{0} + 2pk for any arbitrary integer k
- n_{0}ω_{0} + φ
⇒ In a 100% amplitude modulated signal, the power in the upper sideband when carrier power is to be 100 W and modulation system SSBSC, is
100 W
66 W
50 W
25 W
⇒ In a D latch
D drives R and D drives S
D drives S and D drives R
D drives both R and S
D drives both R and S
⇒ A radio wave is incident on a layer of ionosphere at an angle of 30° with the vertical. If the critical frequency is, 1.2 MHz, the maximum usable frequency is
1.2 MHz
2.4 MHz
0.6 MHz
1.386 MHz
⇒ If the diameter of a wire is doubled, its current carrying capacity becomes
one-fourth
half
twice
four times
⇒ The most common method for biasing a JFET is
reverse bias
self bias
voltage divider bias
none of the above
⇒ Which statement is incorrect for parallel resonance?
P.f. is 1
Y is minimum
B is zero
Z is minimum
⇒ The dual of quantity charge is
current
Voltage
flux
dΦ/dt
⇒ In which of the following devices can the operation be visualised in terms of a series feedback loops?
TWT
Reflex klystron
Klystron amplifier
Backward wave oscillator
⇒ The circuit in figure will act as ideal current source with respect to terminals A and B when frequenc
0
1 rad/sec
4 rad/sec
16 rad/sec
⇒ Values of V_{T} at 20°C for an ideal P-N diode
25.27 mV
30.3 mV
23 mV
50 mV
⇒ Which of the following photodetector does not provide gain?
Phototransistor
Photoconductor
Avalanche photodiode
p-i-n photodiode
⇒ When transient and steady state response require improvement; a __________ is used.
Lead compensator
Lag - Lead compensator
Lag compensator
Integrator
⇒ Transistor T_{1} operates at 30 kHz and T_{2} operates at 300 Hz. The flicker noise is
not depend on frequency
T_{1} > T_{2}
T_{1} = T_{2}
T_{1} < T_{2}
⇒ The length of half-wave antenna is at 30 MHz
2.5 meter
5 meter
10 meter
100 meter
⇒ In a stereo tape recorder the speed of the tape is
38 m/s
19 m/s
9.5 m/s
4.75 m/s
⇒ A stepper motor is
a two phase induction motor
is a kind of rotating amplifier
is an electromagnetic transducer used to convert an angular position of shaft into electrical signal
is an electromechanical device which actuates a train of step angular movements in response to a train of input pulses on one to one basis
⇒ In a three input AND gate A = 1, B = 1, C = 0 The output Y =
ABC
ABC
ABC
ABC
⇒ As per Euler's identity e^{jωt} = cos ωt + j sin ωt
TRUE
FALSE
⇒ UHF range is
30 MHz to 300 MHz
300 MHz to 3000 MHz
3000 MHz to 30, 000 MHz
above 30, 000 MHz
⇒ A unipole is also known as
omnidirectional radiator
unidirectional radiator
line radiator
none of the above
⇒ Some types of traps used in video IF amplifier of colour TV are
shunt traps
series traps
absorption traps
all of the above
⇒ The five flags in 8085 are designated as
Z, CY, S, P and AC
D, Z, S, P, AC
Z, C, S, P, AC
Z, CY, S, D, AC
⇒ Which of the following pairs are correctly matched?
1, 2 and 3
2 and 3
1 and 3
1 and 2
⇒ The memory segment registers in 8086 are denoted by
AS, BS, CS, DS
BS, CS, SS, ES
CS, DS, SS, ES
DS, ES, FS, SS
⇒ Thevenin's theorem is used to find current in a branch of a network. It is now desired to find current in another branch of the network
the same Thevenin's circuit can be used
the same Thevenin's circuit with some modification can be used
it is necessary to find new Thevenin's circuit
either (b) or (c)
⇒ If e = 10 sin(10^{8} t + 3 sin 10^{4} t) then carrier frequency is
0.159 MHz
1.59 MHz
15.9 MHz
159 MHz
⇒ A 16 bit binary adder has
16 half adders
16 full adders
one half adders and 15 full adders
8 half adders and eight full adders
⇒ An S/N ratio of 3 expressed in db is
4.8 dB
2.4 dB
0.48 dB
0.24 dB
⇒ Find the value of i_{x} if each resistance is of 3 Ω and each battery is of
1.1428 V
1.432 A
0.2892 A
O A
⇒ A signal x(n) = sin(ω_{0}n + φ) is the input to a linear time invariant system having a frequency response H(e^{jω}) If the O/P of the system is Ax(n -n_{0}), then the general form of H(e^{jω}) will be
- n_{0}ω_{0} + β for any arbitrary real β
- n_{0}ω_{0} + 2pk for any arbitrary integer k
n_{0}ω_{0} + 2pk for any arbitrary integer k
- n_{0}ω_{0} + φ
⇒ In a 100% amplitude modulated signal, the power in the upper sideband when carrier power is to be 100 W and modulation system SSBSC, is
100 W
66 W
50 W
25 W
⇒ In a D latch
D drives R and D drives S
D drives S and D drives R
D drives both R and S
D drives both R and S
⇒ A radio wave is incident on a layer of ionosphere at an angle of 30° with the vertical. If the critical frequency is, 1.2 MHz, the maximum usable frequency is
1.2 MHz
2.4 MHz
0.6 MHz
1.386 MHz
⇒ If the diameter of a wire is doubled, its current carrying capacity becomes
one-fourth
half
twice
four times
⇒ The most common method for biasing a JFET is
reverse bias
self bias
voltage divider bias
none of the above
⇒ Which statement is incorrect for parallel resonance?
P.f. is 1
Y is minimum
B is zero
Z is minimum
⇒ The dual of quantity charge is
current
Voltage
flux
dΦ/dt
⇒ In which of the following devices can the operation be visualised in terms of a series feedback loops?
TWT
Reflex klystron
Klystron amplifier
Backward wave oscillator
⇒ The circuit in figure will act as ideal current source with respect to terminals A and B when frequenc
0
1 rad/sec
4 rad/sec
16 rad/sec
⇒ Values of V_{T} at 20°C for an ideal P-N diode
25.27 mV
30.3 mV
23 mV
50 mV
⇒ Which of the following photodetector does not provide gain?
Phototransistor
Photoconductor
Avalanche photodiode
p-i-n photodiode
⇒ When transient and steady state response require improvement; a __________ is used.
Lead compensator
Lag - Lead compensator
Lag compensator
Integrator
⇒ Transistor T_{1} operates at 30 kHz and T_{2} operates at 300 Hz. The flicker noise is
not depend on frequency
T_{1} > T_{2}
T_{1} = T_{2}
T_{1} < T_{2}
⇒ The length of half-wave antenna is at 30 MHz
2.5 meter
5 meter
10 meter
100 meter
⇒ In a stereo tape recorder the speed of the tape is
38 m/s
19 m/s
9.5 m/s
4.75 m/s
⇒ A stepper motor is
a two phase induction motor
is a kind of rotating amplifier
is an electromagnetic transducer used to convert an angular position of shaft into electrical signal
is an electromechanical device which actuates a train of step angular movements in response to a train of input pulses on one to one basis
⇒ In a three input AND gate A = 1, B = 1, C = 0 The output Y =
ABC
ABC
ABC
ABC
⇒ As per Euler's identity e^{jωt} = cos ωt + j sin ωt
TRUE
FALSE
⇒ UHF range is
30 MHz to 300 MHz
300 MHz to 3000 MHz
3000 MHz to 30, 000 MHz
above 30, 000 MHz
⇒ A unipole is also known as
omnidirectional radiator
unidirectional radiator
line radiator
none of the above
⇒ Some types of traps used in video IF amplifier of colour TV are
shunt traps
series traps
absorption traps
all of the above
⇒ The five flags in 8085 are designated as
Z, CY, S, P and AC
D, Z, S, P, AC
Z, C, S, P, AC
Z, CY, S, D, AC
⇒ Which of the following pairs are correctly matched?
- Brune's realisation : realisation with ideal transformer.
- Cauer realisation : ladder realisation.
- Bott Duffin realisation : with non ideal transformer.
1, 2 and 3
2 and 3
1 and 3
1 and 2
⇒ The memory segment registers in 8086 are denoted by
AS, BS, CS, DS
BS, CS, SS, ES
CS, DS, SS, ES
DS, ES, FS, SS
⇒ Thevenin's theorem is used to find current in a branch of a network. It is now desired to find current in another branch of the network
the same Thevenin's circuit can be used
the same Thevenin's circuit with some modification can be used
it is necessary to find new Thevenin's circuit
either (b) or (c)
⇒ If e = 10 sin(10^{8} t + 3 sin 10^{4} t) then carrier frequency is
0.159 MHz
1.59 MHz
15.9 MHz
159 MHz