A medium of relative permittivity εr2 = 2 forms an interface with free-space. A point sourceof  electromagnetic  energy  is  located  in  the  medium  at  a  depth  of  1  meter  from  theinterface. Due  to  the  total  internal  reflection,  the  transmitted  beam  has  a  circular  cross-section over the interface. The area of the beam cross-section at the interface is given by

1.  2π m2

2.  π2 m2

3.  (π/2) m2

4.   π m2

View Answer  
4
Correct Answer :

 π m2


Explanation :
No Explanation available for this question

If for a silicon n-p-n transistor, the base-to-emitter voltage (VBE) is 0.7V and the collector-to-base voltage (VCB) is 0.2V, then the transistor is operating in the

1.  normal active mode

2.  saturation mode

3.  inverse active mode

4.  cutoff mode

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4
Correct Answer :

normal active mode


Explanation :
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Consider the following statements S1 and S2. S1 :  The β of a bipolar transistor reduces if the base width is increased. S2 :  The β of a bipolar transistor increases if the doping concentration in the base isincreased Which one of the following is correct

1.  S1 is FALSE and S2 is TRUE  

2.   both S1 and S2 are TRUE

3.  both S1 and S2 are FALSE

4.  S1 is TRUE and S2 is FALSE

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4
Correct Answer :

S1 is TRUE and S2 is FALSE


Explanation :
No Explanation available for this question

The range of signed decimal numbers  that can be represented by 6-bite 1's complementnumber is

1.  -31 to +31

2.  -63 to +64

3.  -64 to +63

4.  -32 to +31

View Answer  
4
Correct Answer :

-31 to +31


Explanation :
No Explanation available for this question

A digital system  is required  to amplify a binary-encoded audio signal. The user should beable to control the gain of the amplifier from a minimum to a maximum in 100 increments.The minimum number of bits required to encode, in straight binary, is  

1.  8  

2.  6 

3.  5

4.  7

View Answer  
4
Correct Answer :

7


Explanation :
No Explanation available for this question

The impulse response h[n] of a linear time-invariant system is given by h[n] = u[n + 3] + u[n - 2] - 2u[n - 7] where u[n] is the unit step sequence. The above system is

1.  stable but not causal

2.  stable and causal

3.  causal but unstable

4.  unstable and not causal

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4
Correct Answer :

stable but not causal


Explanation :
No Explanation available for this question

The gain margin for the system with open-loop transfer function G (s) H (z) = (2(1 + z))/s2,is

1.  ∞ 

2.  0

3.   1

4.   -∞

View Answer  
4
Correct Answer :

 -∞


Explanation :
No Explanation available for this question

Given the G (s) H (z) = K/(s(s + 1)(s + 3)), the point of intersection of the asymptotes of theroot loci with the real axis is

1.  -4

2.  1.33

3.  -1.33

4.  4

View Answer  
4
Correct Answer :

-1.33


Explanation :
No Explanation available for this question

In  a  PCM  system,  if  the  code  word  length  is  increased  from  6  to  8  bits,  the  signal  toquantization noise ratio improves by the factor

1.  8/6

2.  12

3.  16

4.  8

View Answer  
4
Correct Answer :

16


Explanation :
No Explanation available for this question

An  AM  signal  is  detected  using  an  envelope  detector.  The  carrier  frequency  andmodulating signal  frequency are 1 MHz and 2 kHz  respectively. An appropriate value  forthe time constant of the envelope detector is

1.  500 μsec

2.  20 μsec

3.  0.2 μsec

4.  1 μsec

View Answer  
4
Correct Answer :

20 μsec


Explanation :
No Explanation available for this question
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