In the circuit of the figure the magnitudes of VL  and VC are twice that of  Vk.the inductance of the coil is

1.  2.14 mH

2.  5.30 H

3.  3.18 mH

4.  1.32 H

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4
Correct Answer :

3.18 mH


Explanation :
No Explanation available for this question

In figure the potential difference between points P and Q is

1.  12 V

2.  10 V

3.  -6 V

4.  8 V

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4
Correct Answer :

-6 V


Explanation :
No Explanation available for this question

Two ac sources feed a common variable resistive load as shown in the figure.Under  the maximum power transfer condition,the power absorbed by the load resistance RL is

1.  2200 W

2.  1250 W

3.  1000 W

4.  625 W

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4
Correct Answer :

625 W


Explanation :
No Explanation available for this question

In the figure,the value of R is

1.  10Ω

2.  18Ω

3.  24Ω

4.  12Ω

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4
Correct Answer :

12Ω


Explanation :
No Explanation available for this question

A balanced delta connected load of (8+j6) Ω per phase is connected to a 400 V,50 Hz,3-phase supply lines.If the input power factor is to be improved to 0.9 by connecting a bank of star connected capacitors the required kVAR of the bank is

1.  42.7

2.  10.2

3.  28.8

4.  38.4

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4
Correct Answer :

10.2


Explanation :
No Explanation available for this question

In the circuit shown in the figure the switch S is closed at time t=0,the voltage across the inductance at t=0+ is

1.  2V

2.  4V

3.  -6V

4.  8V

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4
Correct Answer :

4V


Explanation :
No Explanation available for this question

The h-parameters for a two-port network are defined by   for the two-port network shown in the figure,the value of h12 is given by

1.  0.125

2.  0.167

3.  0.625

4.  0.25

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4
Correct Answer :

0.25


Explanation :
No Explanation available for this question

A point charge of +1 nC is placed in a space with a permittivity of 8.85×10-12F/m as shown in the figure.The potential difference VPQ between two points P and Q at distances of 40mm and 20mm respectively from the point charge is

1.  0.22 kV

2.  -225 V

3.  -2.24 kV

4.  15 V

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4
Correct Answer :

-225 V


Explanation :
No Explanation available for this question

A parallel plate capacitor has an electrode area of 100 mm2,with a spacing of 0.1 mm between the electrodes.The dielectric between the plates is air with a permittivity of 8.85×10-12 F/m.The charge on the capacitor is 100 V.the stored energy in the capacitor is

1.  8.85 pJ

2.  440 pJ

3.  22.1 nJ

4.  44.3 nJ

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4
Correct Answer :

44.3 nJ


Explanation :
No Explanation available for this question

A composite parallel plate capacitor is made up of two different dielectric materials with different thickness(t1 and t2)as shown in the figure.The two different dielectric materials are separated by a conducting foil F.The voltage of the conducting foil is

1.  52 V

2.  60 V

3.  67 V

4.  33 V

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4
Correct Answer :

60 V


Explanation :
No Explanation available for this question
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