The ac output voltage Vac is

1.   0.25 cos(ωt)mV

2.  1 cos (ωt)mV

3.  2cos (ωt) mV

4.  22cos(ωt)mV

View Answer  
4
Correct Answer :

1 cos (ωt)mV


Explanation :
No Explanation available for this question

How many gates (minimum) are needed for a 3 – bit – up- counter using standard binary and using T flip –flops Asuume ulimited fan-in

1.   4

2.  3

3.  2

4.  1

View Answer  
4
Correct Answer :

2


Explanation :
No Explanation available for this question

The circuit shown in the figure converts

1.  BCD to binary code

2.  Binary to excess -3 code

3.  Excess -3 to Gray code

4.  Gray to Binary code

View Answer  
4
Correct Answer :

BCD to binary code


Explanation :
No Explanation available for this question

A sequential circuit D flip-flop and logic gates is shown in the figure where X and Y are the inputs and Z is the output. The circuits is

1.  S-R FF with inputs X = R and Y = S

2.  S- R FF with inputs X = S and Y = R

3.  J – K FF with inputs X = J and Y = K

4.  J – K FF with inputs X = K and Y = J

View Answer  
4
Correct Answer :

J – K FF with inputs X = K and Y = J


Explanation :
No Explanation available for this question

The current gain of a BJT is

1.   gm ro

2.   gm/ro

3.  gmrπ

4.  gm/rπ

View Answer  
4
Correct Answer :

gmrπ


Explanation :
No Explanation available for this question

The digital block in figure realized using two positive edge triggered D – flip flop. Assume that for t < t0, Q1 = Q2 = 0. The circuit in the digital block is given by

1.  

2.  

3.  

4.  

View Answer  
4
Correct Answer :


Explanation :
No Explanation available for this question

The circuit shown in figure

1.  Is MOD -2 counter

2.  Is MOD -3 counter

3.  Generate sequence 00,10,01,00….

4.  Generate sequence 00,10,00,10,00……

View Answer  
4
Correct Answer :

Is MOD -3 counter


Explanation :
No Explanation available for this question

The mod number of the asynchronous counter shown in the figure is

1.  24

2.  48

3.  25

4.  36

View Answer  
4
Correct Answer :

24


Explanation :
No Explanation available for this question

In the silicon BJT circuit shown below, assume that the emitter area of transistor Q1 is half that of transistor Q2.The value of current I0 is approximately

1.  20

2.  3

3.  40

4.   50

View Answer  
4
Correct Answer :

40


Explanation :
No Explanation available for this question

The three-stage Johnson counter as shown in figure is clocked at a constant frequency of f, from the starting state of Q2, Q1, Qn = 101. The frequency of output Q2, Q1, Qn will be

1.  fc/8

2.  fc/6

3.  fc/3

4.  fc/2

View Answer  
4
Correct Answer :

fc/2


Explanation :
No Explanation available for this question
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