Users Also Read
MCQ's Search Engine
Electrical Engineering
Mechanical Engineering
Civil Engineering
Automobile Engineering
Chemical Engineering
Computer Engineering
Electronics Engineering
Medical Science Engg
On which bands, do the optical fibers operate?
| |
A. | 1 only [Wrong Answer] |
B. | 1 and 2 only [Wrong Answer] |
C. | 1, 2 and only [Wrong Answer] |
D. | 1, 3 and 4 [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 :
⇒ Which of the following amplifiers has a voltage gain of less than 1?
CE
CC
CB
CE or CB
⇒ The noise generated by a resistor depends upon
its resistance value
its operating temperature
both its resistance value and operating temperature
none of the above
⇒ Conductivity is measured in terms of
mho/metre
ohm/metre
mho/metre^{2}
ohm/metre^{2}
⇒ Low-orbit satellites are not used for communications because they
produce sonic booms
do not provide 24 hour/ day contact to the users on Earth
heat up and melt
none
⇒ Consider the directive T : DS105. This directive
directs the assembler to reserve a sequence of 105 bytes in the memory
directs the assembler to reserve a sequence of 105 bits in the memory
directs the assembler to reserve a sequence of consecutive 105 bytes in the memory
directs the assembler to reserve a sequence of consecutive 105 bits in the memory
⇒ A 3 bit synchronous counter uses FF with propagation delay time of 20 ns each. The maximum possible time required for change of state will be.
60 ns
40 ns
20 ns
None
⇒ A function is given f(t) = sin^{2}t + cos^{2}t. Which of the following is true?
f has frequency components at 0 and 1/2p Hz
f has frequency components at 0 and 1/p Hz
f has frequency components at 1/2p and 1/p Hz
f has frequency components at 0, l/2p and 1/p Hz
⇒ The current through R_{1} is(If β = 99, V_{BE} = 0.7
0.1 mA
0.35 mA
0.2 mA
none
⇒ The direction in a Yagi Uda antenna
is longer than the radiating element
is shorter than the radiating element
can be longer or shorter than the radiating element
does not exist
⇒ The dielectric losses do not depend on frequency.
TRUE
FALSE
⇒ A 120 V, 30 Hz source feeds a half wave rectifier circuit through a 4 : 1 step down transformer, the average output voltage is
30 V
13.5 V
10 V
7.07 V
⇒ A bridge type single phase cycloconverter changes the frequency f to f/3. Then one half wave of output contains
3 full waves of input
3 half waves of input
6 full waves of input
6 half waves of input
⇒ If f(t) = r (t - a), F(s) =
e^{-as}/s^{2}
a/(s + a)
1/(s + a)
e^{-as}/s
⇒ Substitution theorem applies to
Linear network
Non linear network
Linear time invariant network
Any network
⇒ In a step down chopper using pulse width modulation, T_{on} = 3 x 10^{-3} and T_{off} = 1 x 10^{-3} s. The chopping frequency is
333.33
250
500
1000
⇒ Output of a phase splitter is
a pair of sine waves of unequal amplitude
a pair of sine waves of equal amplitudes
a pair of sine waves of equal amplitudes and opposite phase
a pair of sine waves of unequal amplitudes and opposite phase
⇒ The ability of a radio receiver to discriminate between different input signals and to accept only one definite signal is called its
sensitivity
attenuation
selectivity
modulation
⇒ 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
⇒ Full duplex operation-permits transmission in both directions at the same time.
TRUE
FALSE
⇒ When temperature is more than ferromagnetic curie temperature, the behaviour of a ferromagnetic material is similar to that of paramagnetic material.
TRUE
FALSE
⇒ A transistor has
I only
II only
II and III only
I and II only
⇒ If a sheet of a mica is inserted between the plates of an air capacitor, the capacitance
will increase
will return the same
will decrease
may increase or decrease
⇒ If a line is terminated in characteristic impedance Z_{0}, the input impedance measured at the input will be
Z_{0}
Z_{0}/2
Zero
infinite
⇒ The refractive index of E layer at frequency of 81 N
0
∞
1
0.5
⇒ Logic pulser
generates short duration pulses
generates long duration pulses
generates sinusoidal voltage
generates ideal pulses
⇒ The sum of positive real functions
is a positive real function
may be a positive real function or not
can not be a positive real function
either (b) or (c)
⇒ When x(n) is real then the Fourier series coefficients are correlated as __________ .
a_{-k} = a_{k}^{*}
a_{k} = ak^{*}
a_{k+1} = a_{k}_{*}
a_{-k+1} = a_{k}^{*}
⇒ Two independence parameters Z_{11} and Z_{12} of the two-port network in the figure
Z_{11} = 2.75 Ω and Z_{12} = 0.25 Ω
Z_{11} = 3 Ω and Z_{12} = 0.5 Ω
Z_{11} = 3 Ω and Z_{12} = 0.25 Ω
Z_{11} = 2.25 Ω and Z_{12} = 0.5 Ω
⇒ Cross-over distortion behaviour is a characteristic of
class A output stage
class B output stage
class AB output stage
common base output stage
⇒ Typical value of reverse current in a semiconductor diode is
0.0416666666666667
0.1 A
1 μA
0.1 μA
⇒ Which of the following amplifiers has a voltage gain of less than 1?
CE
CC
CB
CE or CB
⇒ The noise generated by a resistor depends upon
its resistance value
its operating temperature
both its resistance value and operating temperature
none of the above
⇒ Conductivity is measured in terms of
mho/metre
ohm/metre
mho/metre^{2}
ohm/metre^{2}
⇒ Low-orbit satellites are not used for communications because they
produce sonic booms
do not provide 24 hour/ day contact to the users on Earth
heat up and melt
none
⇒ Consider the directive T : DS105. This directive
directs the assembler to reserve a sequence of 105 bytes in the memory
directs the assembler to reserve a sequence of 105 bits in the memory
directs the assembler to reserve a sequence of consecutive 105 bytes in the memory
directs the assembler to reserve a sequence of consecutive 105 bits in the memory
⇒ A 3 bit synchronous counter uses FF with propagation delay time of 20 ns each. The maximum possible time required for change of state will be.
60 ns
40 ns
20 ns
None
⇒ A function is given f(t) = sin^{2}t + cos^{2}t. Which of the following is true?
f has frequency components at 0 and 1/2p Hz
f has frequency components at 0 and 1/p Hz
f has frequency components at 1/2p and 1/p Hz
f has frequency components at 0, l/2p and 1/p Hz
⇒ The current through R_{1} is(If β = 99, V_{BE} = 0.7
0.1 mA
0.35 mA
0.2 mA
none
⇒ The direction in a Yagi Uda antenna
is longer than the radiating element
is shorter than the radiating element
can be longer or shorter than the radiating element
does not exist
⇒ The dielectric losses do not depend on frequency.
TRUE
FALSE
⇒ A 120 V, 30 Hz source feeds a half wave rectifier circuit through a 4 : 1 step down transformer, the average output voltage is
30 V
13.5 V
10 V
7.07 V
⇒ A bridge type single phase cycloconverter changes the frequency f to f/3. Then one half wave of output contains
3 full waves of input
3 half waves of input
6 full waves of input
6 half waves of input
⇒ If f(t) = r (t - a), F(s) =
e^{-as}/s^{2}
a/(s + a)
1/(s + a)
e^{-as}/s
⇒ Substitution theorem applies to
Linear network
Non linear network
Linear time invariant network
Any network
⇒ In a step down chopper using pulse width modulation, T_{on} = 3 x 10^{-3} and T_{off} = 1 x 10^{-3} s. The chopping frequency is
333.33
250
500
1000
⇒ Output of a phase splitter is
a pair of sine waves of unequal amplitude
a pair of sine waves of equal amplitudes
a pair of sine waves of equal amplitudes and opposite phase
a pair of sine waves of unequal amplitudes and opposite phase
⇒ The ability of a radio receiver to discriminate between different input signals and to accept only one definite signal is called its
sensitivity
attenuation
selectivity
modulation
⇒ 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
⇒ Full duplex operation-permits transmission in both directions at the same time.
TRUE
FALSE
⇒ When temperature is more than ferromagnetic curie temperature, the behaviour of a ferromagnetic material is similar to that of paramagnetic material.
TRUE
FALSE
⇒ A transistor has
- collector
- emitter
- base
I only
II only
II and III only
I and II only
⇒ If a sheet of a mica is inserted between the plates of an air capacitor, the capacitance
will increase
will return the same
will decrease
may increase or decrease
⇒ If a line is terminated in characteristic impedance Z_{0}, the input impedance measured at the input will be
Z_{0}
Z_{0}/2
Zero
infinite
⇒ The refractive index of E layer at frequency of 81 N
0
∞
1
0.5
⇒ Logic pulser
generates short duration pulses
generates long duration pulses
generates sinusoidal voltage
generates ideal pulses
⇒ The sum of positive real functions
is a positive real function
may be a positive real function or not
can not be a positive real function
either (b) or (c)
⇒ When x(n) is real then the Fourier series coefficients are correlated as __________ .
a_{-k} = a_{k}^{*}
a_{k} = ak^{*}
a_{k+1} = a_{k}_{*}
a_{-k+1} = a_{k}^{*}
⇒ Two independence parameters Z_{11} and Z_{12} of the two-port network in the figure
Z_{11} = 2.75 Ω and Z_{12} = 0.25 Ω
Z_{11} = 3 Ω and Z_{12} = 0.5 Ω
Z_{11} = 3 Ω and Z_{12} = 0.25 Ω
Z_{11} = 2.25 Ω and Z_{12} = 0.5 Ω
⇒ Cross-over distortion behaviour is a characteristic of
class A output stage
class B output stage
class AB output stage
common base output stage
⇒ Typical value of reverse current in a semiconductor diode is
0.0416666666666667
0.1 A
1 μA
0.1 μA