A 100 kVA transformer has 4% impedance. and 50kVA transforiner has 3% impedance when they are operated in parallel, which transformer will reach full load first

1.  3%

2.  4%

3.  data is insufficient

4.  none of these

View Answer  
4
Correct Answer :

3\%


Explanation :
No Explanation available for this question

A synchronous generator connected to infinite bus delivers power at a log p.f. If its excitation is increased

1.  the terminal voltage increases

2.  Voltage angle S increases

3.  Current deliverted increased

4.   both (b) and (c)

View Answer  
4
Correct Answer :

both (b) and (c)


Explanation :
No Explanation available for this question

The system matrix of a continuous-time system describe in the state variable form is A= The system is stable for all values of x and y satisfying

1.  x

2.  x>1/2,y>1/2

3.  x

4.  x

View Answer  
4
Correct Answer :

x<0,y<2


Explanation :
No Explanation available for this question

The incremental cost characteristics of two generators delivering 200 MW are as follows : dF1/dP1= 2.0 + 0.01 P1 dF2/dP2= 1.6 + 0.2 P2 For economic operation, the generations P1 and P2 should be

1.  P1= P2 = 100 MW

2.  P1 = 80 MW, P2 = 120 MW

3.  P1 = 200 MW, P2 = 0 MW

4.  P1 = 120 MW, P2 = 80 MW

View Answer  
4
Correct Answer :

P1 = 120 MW, P2 = 80 MW


Explanation :
No Explanation available for this question

Consider the closed loop system shown in the give figure The state model of the system is

1.  =+u,y=[1 0]

View Answer  
1
Correct Answer :

Explanation :
No Explanation available for this question

Incremental fuel costs (in some appropriate unit)for a power plant consisting of three generating units are IC1 = 20 + 0.3 P1, IC2 = 32 + 0.4P2,IC3 = 30where P1 is the power in MW generated by unit i, for i=1, 2 and 3. Assume that all the three units are operating all the time. Minimum and maximum loads on each unit are 50 MW and 300 MW respectively If the plant is operating on economic load dispatch to supply the total power generated by each unit is

1.  P1 = 242.86 MW;P2 = 157.14.MW; and P3 =300 MW

2.  P1 = 157.14 MW;P2 = 242.86 MW; and P3 = 300 MW

3.  P1 = 300.0 MW;P2 = 300.0 MW; and P3 = 100

4.   P1 = 233.3 MW;P2= 233.3 MW; and P3 = 233.4

View Answer  
4
Correct Answer :

P1 = 242.86 MW;P2 = 157.14.MW; and P3 =300 MW


Explanation :
No Explanation available for this question

The following data pertain to two alternators working in parallel and supplying a total load of 80 MW Machine 1 : 40 MVA with 5% speed regulation Machine 2 : 601VIVAWith 5% speed regulation . The load sharing between machines ..1 and 2 will be

1.  P1/ 48MW P2/32MW

2.  40 MW 40 MW

3.  30 MW 50 MW

4.   32 MW 48 MW

View Answer  
4
Correct Answer :

30 MW 50 MW


Explanation :
No Explanation available for this question

The minimum number of state necessary to describe the network shown in the figure in a state variable form is

1.  2

2.  3

3.  4

4.  6

View Answer  
4
Correct Answer :

3


Explanation :
No Explanation available for this question

Consider the following statements regarding a linear system y=f(x1) 1.f(x1+x2)=f(x1)+f(x2) 2.f[x(t+T)]=f[x(t)+f[x(T)] 3.f(Kx)=Kf(x) Of these statements

1.  1,2 and 3 are correct

2.  1 and 2 are correct

3.  3 alone is correct

4.  1 and 3 are correct

View Answer  
4
Correct Answer :

1 and 3 are correct


Explanation :
No Explanation available for this question

The combined frequency regulation of machines in area of capacity 1500 MW and operating at a normal frequency of 60 kHz is 0.1 pu on its own. base capacity. The regulation in Hz/ MW will be

1.  0.1 / 1500

2.  60 / 1500

3.  6 / 1500

4.   60 / 150

View Answer  
4
Correct Answer :

6 / 1500


Explanation :
No Explanation available for this question
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