Assuming that the β of the transistor is extremely large and VBE = 0.7V, IC and VCE in the circuit shown in the figure are

1.  IC = 1 mA, VCE = 4.7 V

2.  IC = 0.5 mA, VCE = 3.75 V

3.  IC = 1 mA, VCE = 2.5 V

4.  IC = 0.5 mA, VCE = 3.9 V

View Answer  
4
Correct Answer :

IC = 1 mA, VCE = 2.5 V


Explanation :
No Explanation available for this question

The value of C required for sinusoidal oscillations of frequency 1kHz in the circuit of given figure is

1.  (1/2π) μF

2.  2π μF

3.  (1/(2π√6)) μF

4.  2π√6 μF

View Answer  
4
Correct Answer :

(1/2π) μF


Explanation :
No Explanation available for this question

In the op-amp circuit given in the figure, the load current IL is

1.   -(vs/R2)

2.  (vs/R2)

3.  -(vs/RL)

4.  -(v /RL )

View Answer  
4
Correct Answer :

 -(vs/R2)


Explanation :
No Explanation available for this question

In the voltage regulator shown in the figure, the load current can vary from 100 mA to 500mA. Assuming that the Zener diode is ideal (i.e., the Zener knee current is negligibly small and Zener resistance is zero in the breakdown region), the value of R is

1.  7

2.  70 ?

3.  (70/3) ?

4.  14 ?

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4
Correct Answer :

14 ?


Explanation :
No Explanation available for this question

In  the modulo-6 ripple counter shown  in  the given  figure,  the output of  the 2-input gate  is used to clear the J-K flip-flops. The 2-input gate is

1.  a NAND gate

2.  a NOR gate

3.  an OR gate

4.  an AND gate

View Answer  
4
Correct Answer :

an OR gate


Explanation :
No Explanation available for this question

A rectangular pulse train s(t) as shown in the figure is convolved with the signal cos2 (4p x103t). the convolved signal will be a

1.  DC

2.  12 kHz sinusoid

3.  8 kHz sinusoid

4.  14 kHz sinusoid

View Answer  
4
Correct Answer :

14 kHz sinusoid


Explanation :
No Explanation available for this question

The impulse response h[n] of a linear time invariant system is given as If the input to the above system is the sequence e(jπn/4), then the output is

1.  4√2e(jπn/4)

2.  4√2e(-jπn/4)

3.  4e(jπn/4)

4.  -4e(jπn/4)

View Answer  
4
Correct Answer :

4√2e(jπn/4)


Explanation :
No Explanation available for this question

Let x(t) and y(t) (with Fourier transforms X(f) and Y(f) respectively) be related as shown inthe given figure. Then Y(f) is

1.  -(1/2) X (f/2)e-j2πf

2.  -(1/2) X (f/2)ej2πf

3.  - X (f/2)ej2πf

4.  - X (f/2)e-j2πf

View Answer  
4
Correct Answer :

-(1/2) X (f/2)ej2πf


Explanation :
No Explanation available for this question

Consider the signal flow graph shown in the figure below. The gain (X5/X1) is

1.  (1 - (be + cf + dg))/abc

2.  bedg/(1 - (be + cf + dg))

3.  abcd/(1 - (be + cf + dg) + bedg)

4.  (1 - (be + cf + dg) + bedg)/abcd

View Answer  
4
Correct Answer :

abcd/(1 - (be + cf + dg) + bedg)


Explanation :
No Explanation available for this question

Consider  the signal x(t) shown  in  the  figure. Let h(t) denote  the  impulse  response of  the filter matched  to x(t), with h(t) being non-zero only  in  the  interval 0  to 4 sec. The slop of h(t) in the interval 3 < t < sec is

1.  (1/2) sec-1

2.  -1 sec-1

3.  -(1/2) sec-1

4.  1 sec-1

View Answer  
4
Correct Answer :

1 sec-1


Explanation :
No Explanation available for this question
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