The centre tap full-wave single-phase rectifier circuit uses 2 diodes as shown in the given figure. The rms voltage across each diode is

1.  790.7V

2.  395.3V

3.  280V

4.   201.3V

View Answer  
4
Correct Answer :

395.3V


Explanation :
No Explanation available for this question

The probability that top and bottom cards of a randomly shuffled deck are both aces is

1.  

2.  

3.  

4.  

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4
Correct Answer :


Explanation :
No Explanation available for this question

In the circuit shown in the given figure, transistor is in the active mode. VBE=0.7 volt.The best approximation without knowing hfe for Vc as shown in the figure is

1.  1.0V

2.  3.3V

3.  4.3V

4.  4.7V

View Answer  
4
Correct Answer :

4.3V


Explanation :
No Explanation available for this question

The probability that a number selected at random between 100 and 999(both inclusive) willnot contain the digit 7 is

1.  16/25

2.  (9/10)3

3.  27/75

4.   18/25

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4
Correct Answer :

18/25


Explanation :
No Explanation available for this question

If 20 per cent managers are technocrats,the probability that a random committee of 5 managers consists of exactly 2 technocrats is

1.  0.2048

2.  0.4000

3.  0.4096

4.  0.9421

View Answer  
4
Correct Answer :

0.2048


Explanation :
No Explanation available for this question

The probability that two friends share the same birth-month is

1.  1/6

2.  1/12

3.  1/144

4.  1/24

View Answer  
4
Correct Answer :

1/12


Explanation :
No Explanation available for this question

A regression model is used to express a variable Y as a function of another variable X.This implies that

1.  There is a casual relationship between Y and X

2.  A value of X may be used to estimate a value of Y

3.  Values of X exactly determine values of Y

4.  There is no casual relationship between Y and X

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4
Correct Answer :

A value of X may be used to estimate a value of Y


Explanation :
No Explanation available for this question

A voltage source VAB=4sinωt is applied to the terminals A and B of the circuit shown in the given figure. The diodes are assumed to be ideal. The impedance by the circuit across the terminals A and B is

1.  5KΩ

2.  10KΩ

3.  15KΩ

4.   20KΩ

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4
Correct Answer :

10KΩ


Explanation :
No Explanation available for this question

Arrivals at telephone booth are considered to be pisson,with an average time of 10 minutes between successive arrivals.The length of a phone call is distributed exponentially with mean 3minutes.The probability that an arrival does not have to wait before service is

1.  0.3

2.  0.5

3.  0.7

4.  0.9

View Answer  
4
Correct Answer :

0.3


Explanation :
No Explanation available for this question

A box contains 5 black and 5 red balls.Two balls are randomly picked one after another from the box,without replacement.The probability for both balls being red is

1.  1/90

2.  1/5

3.  19/90

4.  2/9

View Answer  
4
Correct Answer :

2/9


Explanation :
No Explanation available for this question
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