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Sanya AgarwalEduRev Mechanical Engineering |
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Sanya Agarwal
EduRev Mechanical Engineering
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Discussed Questions
If Ex and Ey represent the energies of m(t) and y(t) respectively, then 
_______________
Correct answer is '1'. Can you explain this answer?
If Ex and Ey represent the energies of m(t) and y(t) respectively, then _______________
_______________
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Sanya Agarwal answered • Oct 11, 2023 |
Mh (ω) = -jM (6)) sgn(ω), (The given system is a Hilbert transformer) The π of a Hilbert transformer is
H (ω) = -jsgn (ω)
in the circuit shown below:
A 6 cm x 4 cm rectangular wave guide is filled with dielectric of refractive index 1.25Que: The range of frequencies over which single mode operation will occur is- a)2.24 GHz < f <3.33 GHz
- b)2 GHz < f < 3 GHz
- c)4.48 GHz < f < 7.70 GHz
- d)4 GHz < f < 6 GHz
Correct answer is option 'A'. Can you explain this answer?
A 6 cm x 4 cm rectangular wave guide is filled with dielectric of refractive index 1.25
Que: The range of frequencies over which single mode operation will occur is
a)
2.24 GHz < f <3.33 GHz
b)
2 GHz < f < 3 GHz
c)
4.48 GHz < f < 7.70 GHz
d)
4 GHz < f < 6 GHz
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Sanya Agarwal answered • Oct 11, 2023 |
- a)0
- b)1
- c)-1
- d)2
Correct answer is option 'B'. Can you explain this answer?
a)
0
b)
1
c)
-1
d)
2
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Sanya Agarwal answered • Oct 11, 2023 |
The value of 
is- a)-1
- b)1
- c)0
- d)
Correct answer is option 'C'. Can you explain this answer?
The value of is
isa)
-1
b)
1
c)
0
d)
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Sanya Agarwal answered • Oct 11, 2023 |
.For a system to be designated as hi-fi, the signal to noise ratio should be at least- a)25 dB
- b)50 dB
- c)75 dB
- d)100 dB
Correct answer is option 'B'. Can you explain this answer?
For a system to be designated as hi-fi, the signal to noise ratio should be at least
a)
25 dB
b)
50 dB
c)
75 dB
d)
100 dB
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Sanya Agarwal answered • Oct 11, 2023 |
Hi-Fi system has a 
ratio at least equal to 50 dB.
ratio at least equal to 50 dB.For the circuit shown below, the output voltage is given by
- a)
- b)
- c)
- d)
Correct answer is option 'D'. Can you explain this answer?
For the circuit shown below, the output voltage is given by
a)
b)
c)
d)
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Sanya Agarwal answered • Oct 11, 2023 |
Using superposition theorem, the output voltage is given by
The LED in the circuit of fig. will be on if vi is
- a) > 10 V
- b)<10 V
- c) > 5 V
- d)< 5 V
Correct answer is option 'C'. Can you explain this answer?
The LED in the circuit of fig. will be on if vi is
a)
> 10 V
b)
<10 V
c)
> 5 V
d)
< 5 V
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Sanya Agarwal answered • Oct 11, 2023 |
When v+ > 5 V, output will be positive and LED will be on. Hence (C) is correct.
- a)a
- b)b
- c)c
- d)d
Correct answer is option 'D'. Can you explain this answer?
a)
a
b)
b
c)
c
d)
d
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Sanya Agarwal answered • Oct 11, 2023 |
Correct Answer :- d
Explanation : a) The common emitter amplifier is INVERTING. The inversion is equivalent to 180 degree phase shift. The inversion can be easily seen intuitively without any complex circuit analysis.
b) CB will not provide current gain and input impedance is very low, output impedance is very high therefore it is not used in many applications.
c) The common collector or grounded collector configuration is commonly used where a high impedance input source needs to be connected to a low impedance output load requiring a high current gain.
d) The Darlington transistor is a special type of transistor with a high current gain. It consists of two internally bipolar transistors being connected in cascade.
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