At an industrial sub-station with a 4 MW load,a capacitor of 2 MVAR is installed to maintain the load power factor at 0.97 lagging.If the capacitor goes out of service,the load power factor becomes

1.  0.85 lag

2.  1.00 lag

3.  0.80 lag

4.  0.90 lag

View Answer  
4
Correct Answer :

0.80 lag


Explanation :
No Explanation available for this question

The network shown in given Fig.has impedances in p.u. as indicated.The diagonal element Y22 of the bus admittance matrix YBUS of the network is:

1.  –j19.8

2.  +j20.0

3.  +j0.2

4.  –j19.95

View Answer  
4
Correct Answer :

–j19.95


Explanation :
No Explanation available for this question

A load centre is at an equidistant from the two thermal generating stations G1 and G2 as shown in given Fig.The fuel cost characteristics of the generating stations are given by F1=a+bP1+cP12 Rs/hour F2=a+bP2 + 2cP22 Rs/hour where P1 and P2 are the generation in MW of G1 and G2, respectively.For most economic generation to meet 300 MW of load, P1 and P2 respectively,are

1.  150,150

2.  100,200

3.  200,100

4.  175,125

View Answer  
4
Correct Answer :

200,100


Explanation :
No Explanation available for this question

Two networks are connected in cascade as shown in  given Fig.With the usual notations the equivalent A,B,C and D constants are obtained. Given that C=0.025450,the value of Z2 is:

1.  10300Ω

2.  40?- 450Ω

3.  1Ω

4.  0Ω

View Answer  
4
Correct Answer :

40?- 450Ω


Explanation :
No Explanation available for this question

A generator with constant 1.0 p.u. terminal voltage supplies power through a step-up transformer of 0.12 p.u. reactance and a double-circuit line to an infinite bus bas as shown in  given Fig.The infinite bus voltage is maintained at 1.0 p.u. Neglecting the resistances and susceptances of the system,the steady state stability power limit of the system is 6.25 p.u.If one of the double-circuit is tripped,the resulting steady state stability power limit in p.u.will be

1.  12.5 p.u.

2.  3.125 p.u

3.  10.0 p.u

4.  5.0 p.u.

View Answer  
4
Correct Answer :

5.0 p.u.


Explanation :
No Explanation available for this question

The simultaneous application of signals x(t) and y(t)to the horizontal and vertical plates respectively of an oscilloscope, produces a vertical figure-of-8 display.If P and Q are constants and x(t) =Psin(4t+30) then y (t) is equal to

1.  Q sin (4t - 30)

2.  Q sin (2t + 15)

3.  Q sin (8t + 60)

4.  Q sin (4t + 30)

View Answer  
4
Correct Answer :

Q sin (2t + 15)


Explanation :
No Explanation available for this question

A DC ammeter has a resistance of 0.1Ω and its current range is 0-100A.If the range is to be extended to 0 - 500A,the meter requires the following shunt resistance:

1.  0.010 Ω

2.  0.011 Ω  

3.  0.025 Ω

4.  1.0 Ω

View Answer  
4
Correct Answer :

0.025 Ω


Explanation :
No Explanation available for this question

A 1000 V DC supply has two 1-core cables as its positive and negative leads their insulation resistances to earth are 4 MΩ and 6 MΩ respectively,as shown in given Fig.A voltmeter with resistance 50 KΩ is used to measure the insulation of the cable.When connected between the positive core and earth,the voltmeter reads

1.  8 V

2.  16 V

3.  24 V

4.  40 V

View Answer  
4
Correct Answer :

8 V


Explanation :
No Explanation available for this question

The set-up in given Fig. is used to measure resistance R. The ammeter and voltmeter resistances are 0.01Ω and 2000Ω respectively.Their readings are 2A and 180V, respectively giving a measured resistance of 90Ω.The percentage error in the measurement is:

1.  2.25%

2.  2.35%

3.  4.5%

4.  4.71%

View Answer  
4
Correct Answer :

4.71\%


Explanation :
No Explanation available for this question

Two wattmeters, which are connected to measure the total power on a three- phase system supplying a balanced load read 10.5 kW and -2.5 kW respectively.The total power and the power factor respectively are

1.  13.0 kW,0.334      

2.  13.0 kW, 0.684  

3.  8.0 kW, 0.52

4.  8.0 kW, 0.334

View Answer  
4
Correct Answer :

8.0 kW, 0.334


Explanation :
No Explanation available for this question
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