A conductor is composed of seven identical copper strands, each having a radius r. The self GMD of the conductors will be

1.  2.177 r

2.  2.645 r

3.  2.141 r

4.  1.21 r

View Answer  
4
Correct Answer :

2.177 r


Explanation :
No Explanation available for this question

The closed-loop transfer function of a control system is given by C(s)/R(s)= 2(s - 1)/(s + 2)(s + 1) For a unit step input the output is

1.   - 3e-2t +4e-t -1

2.  - 3e-2t-4e-t + 1

3.  zero

4.  infinity

View Answer  
4
Correct Answer :

- 3e-2t +4e-t -1


Explanation :
No Explanation available for this question

The position and velocity error coefficient for the system of transfer function G(s) =50 /(1+ 0.1s) (1 + 2s) respectively are

1.  zero and zero

2.  zero and infinity

3.  50 and zero

4.  50 and infinity

View Answer  
4
Correct Answer :

50 and zero


Explanation :
No Explanation available for this question

What is the charging current per km, when the transmission line is operating at 264 kV

1.  0.312 A/km

2.  0.257 A/km

3.  0.4272 A/km

4.  0.2136 A/km

View Answer  
4
Correct Answer :

0.4272 A/km


Explanation :
No Explanation available for this question

The transfer function of a system is 10/1 + s. When operated as a unity feedback system, the no state error to a unit step input will be

1.  zero

2.  1/11

3.  10

4.  infinity

View Answer  
4
Correct Answer :

1/11


Explanation :
No Explanation available for this question

A3-Φ load of 750 kW at 400 V, 50 Hz, operates at a power factor of 0.7 lagging. What is the capacitance per phase of a mesh connected capacitor bank to improve the power factor to 0.95 lagging

1.  3040 F

2.  2500 F

3.  3438 F

4.  2789 F

View Answer  
4
Correct Answer :

3438 F


Explanation :
No Explanation available for this question

What is the time of operation of a relay of rating 5 amp 2.2 sec, IDMT and having a relay setting of 125% Tms = 0.6 It is connected to a supply circuit through a CT, 400 ratio. The fault current is 4000 amp.

1.  10.0 sec

2.  1.92 sec

3.  4.5 sec

4.  2.4 sec

View Answer  
4
Correct Answer :

1.92 sec


Explanation :
No Explanation available for this question

A two conductor 1- line operates at 50 Hz. The diameter of each conductor is 2 cm and are spaced 3m apart. What is the line to line capacitance ?

1.  9.74 X 10-9 F/km

2.  4.87 X 10-9 F/km

3.  3.05 x 10-9 F/km

4.   None of these

View Answer  
4
Correct Answer :

4.87 X 10-9 F/km


Explanation :
No Explanation available for this question

A two conductor 1-π line operates at 50 Hz. The diameter of each conductor is 4 cm and are spaced 6 m apart. What is the capacitive susceptance to neutral per km

1.  1.42 x 10-9 s/km

2.  3.25 x 10-8 s/km

3.  4.8 x 10-9 s/km

4.  3.06 x 10-9 s/km

View Answer  
4
Correct Answer :

3.06 x 10-9 s/km


Explanation :
No Explanation available for this question

A three phase 50 Hz line consists of three conductors each of diameter 21 min. The spacing between the conductors as follows : A - B = 3m, B - C = 5m, C - A = 3.6m If the line operates at 132 kV, the reactive volt ampere generated by the line per km is

1.  51.07 kVAr

2.  51.70 kVAr

3.  40.0 kVAr

4.  60.516 kVAr

View Answer  
4
Correct Answer :

51.70 kVAr


Explanation :
No Explanation available for this question
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