Electrical Engineering (EE)

The cut off frequency of the TEM wave is
  • a)
    0
  • b)
    1 GHz
  • c)
    6 GHz
  • d)
    infinity
Correct answer is option 'A'. Can you explain this answer?

SATYA DEVI answered  •  31 minutes ago
Answer: a
Explanation: The TEM waves have both E and H perpendicular to the guide axis. Thus its cut off frequency is zero.

Which one of the following applications software’s is used to obtain an accurate root locus for?
  • a)
    LISP
  • b)
    MATLAB
  • c)
    dBase
  • d)
    Oracle
Correct answer is option 'B'. Can you explain this answer?

BEENA DEVI answered  •  31 minutes ago
Answer: b
Explanation: MATLAB stands for mathematics laboratory in which the input is in the form of the matrix and is the best software for drawing root locus.

Scientist Evans have contribution in :
  • a)
    Asymptotic plots
  • b)
    Polar plots
  • c)
    Root locus technique
  • d)
    Constant M and n circle
Correct answer is option 'C'. Can you explain this answer?

DURGA DEVI answered  •  31 minutes ago
Answer: c
Explanation: Root locus technique is used to find the transient and steady state response characteristics by finding the locus of the gain of the system and this was made Scientist Evans .

For a Si transistor connected as shown in the fig. VBE = 0.7V. Given that the reverse saturation current of the junction at room temperature is 200 nA, the IC is given by
  • a)
    78.93 A
  • b)
    147.86 mA
  • c)
    154.13 mA
  • d)
    72.26 mA
Correct answer is option 'B'. Can you explain this answer?

SONIKA AMAR answered  •  31 minutes ago
Since base is connected to collector of the transistor, therefore it works as a diode
                         Ic = I0{eVBE/ηVT-1}
Here, I0 = 200 nA, VBE = 0.7, η = 2, VT = 26 mV
So,                                 Ic  =  147.86 mA

 If the system matrix of a linear time invariant continuous system is given by
Its characteristic equation is given by: 
  • a)
    s2+5s+3=0
  • b)
    s2-3s-5=0
  • c)
    s2+3s+5=0
  • d)
    s2+s+2=0
Correct answer is option 'A'. Can you explain this answer?

DURGI DEVI answered  •  13 hours ago
Answer: a
Explanation: The transfer function is calculated by the state variable analysis and hence the transfer function is calculated by state transition matrix and taking the inverse Laplace transform.

In a bode magnitude plot, which one of the following slopes would be exhibited at high frequencies by a 4th order all-pole system?
  • a)
    -80dB/decade
  • b)
    -40 dB/decade
  • c)
    40 dB/decade
  • d)
    80 dB/decade
Correct answer is option 'A'. Can you explain this answer?

NAINCY PRAKASH answered  •  13 hours ago
Answer: a
Explanation: A 4th order all pole system means that the system must be having no zero or s-term in numerator and s4 terms in denominator. One pole exhibits -20dB/decade slope, so 4 pole exhibits a slope of -80 dB /decade.

The dc output voltage of the circuit is
  • a)
    4.3 V
  • b)
    1.369 V
  • c)
    3.87 V
  • d)
    1.94 V
Correct answer is option 'B'. Can you explain this answer?

INDU SHARMA answered  •  13 hours ago
This is half wave Rectifier, because in +ve cycle both the diode will be in forward biased.
For +ve cycle,
Vo max = Imax. Req
2.59 x 10-3 x 1.66 x 103
4.299 volt.

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