For the circuit shown in the figure the Boolean expression for the output Y in the terms of inputs  P,Q,R and S

1.  

2.  P+Q+R+S

3.  

4.  (P+Q)(R+S)

View Answer  
4
Correct Answer :


Explanation :
No Explanation available for this question

In the circuit shown in the figure it is found that the input ac voltage (v) and current i are in phase.the coupling co-efficient is K= where, M is the mutual inductance between the two coils.the value of K and the dot polarity of the coil P-Q are

1.  K=0.25 and dot at P

2.  K=0.5 and dot at P

3.  K=0.25 and dot at Q

4.  K=0.5 and dot at Q

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4
Correct Answer :

K=0.25 and dot at Q


Explanation :
No Explanation available for this question

consider the circuit shown in the figure if the frequency of the source is 50 Hz,then the value of to which results in a transient free response is

1.  0 ms

2.  1.78 ms

3.  2.71 ms

4.  2.91 ms

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4
Correct Answer :

1.78 ms


Explanation :
No Explanation available for this question

A three phase thyristor bridge rectifier is used in a HVDC link.The firing angle α as measured from the point of natural commutation is constrained to lie between 5o and 30o.if the dc side current and ac side voltage magnitudes are constant,which of the following statements is true(neglect harmonics in the ac side currents and commutation overlap in your analysis)

1.  reactive power absorbed by the rectifier is maximum when α=5o

2.  reactive power absorbed by the rectifier is maximum when α=30o

3.  reactive power absorbed by the rectifier is maximum when α=15o

4.   reactive power absorbed by the rectifier is maximum when α=10o

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4
Correct Answer :

reactive power absorbed by the rectifier is maximum when α=30o


Explanation :
No Explanation available for this question

A power system consists of 2 areas (area 1 and area 2)connected by a single tie line.it is required to carry out a load flow study on this system.while entering the network data(connectivity and parameters)is inadvertently left out.if the load flow program is run with this incomplete data.

1.  the load-flow will converge only if the slack bus is specified in area 1

2.  the load-flow will converge only if the slack bus is specified in area 2

3.  the load-flow will converge only if the slack bus is specified in either area 1 or area 2

4.  the load-flow will not converge if only one slack bus is specified.

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4
Correct Answer :

the load-flow will not converge if only one slack bus is specified.


Explanation :
No Explanation available for this question

A transmission line has a total series reactance of 0.2 pu.Reactive power compensation is applied at the midpoint of the line and it is controlled such that the midpoint voltage of the transmission line is always maintained at 0.98 pu.if voltage at both ends of the line are maintained at 1.0 pu,then the steady state power transfer limit of the transmission line is

1.  9.8 pu

2.  4.9 pu

3.  19.6 pu

4.  5 pu

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4
Correct Answer :

5 pu


Explanation :
No Explanation available for this question

A generator is connected to a transformer which feeds another transformer through a short feeder.the zero sequence impedance values are expressed in pu on a common base and are indicated in the beiow figure.the thevenin equivalent zero sequence impedance at point B is

1.  0.8+j0.6

2.  0.75+j0.22

3.  0.75+j0.25

4.  1.5+j0.25

View Answer  
4
Correct Answer :

0.75+j0.22


Explanation :
No Explanation available for this question

For the system X=X+] u,which of the following statements is true

1.  the system is controllable but unstable

2.  the system is uncontrollable but unstable

3.  the system is controllable but stable

4.  the system is uncontrollable but stable

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4
Correct Answer :

the system is uncontrollable but unstable


Explanation :
No Explanation available for this question

A unity feedback system has an open loop function,G(s)=.the root locus plot is

1.  

2.  

3.  

4.  

View Answer  
4
Correct Answer :


Explanation :
No Explanation available for this question

The transfer function of the system described by with u as input and y as output is

1.  

2.  

3.  

4.  

View Answer  
4
Correct Answer :


Explanation :
No Explanation available for this question
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