Previous years GATE questions from chapter Electrical Circuits

 

2014 EE 01

 

1. The three circuit elements shown in the figure are part of an electric circuit. The
total power absorbed by the three circuit elements in watts is _____.

                          

 

2. C0 is the capacitance of a parallel plate capacitor with air as dielectric (as in figure (a)). If, half of the entire gap as shown in figure (b) is filled with a dielectric of permittivity e r , the expression for the modified capacitance is _____________.

             

   

3. combination of 1 mF capacitor with an initial voltage vc ^0h =- 2 V in series with a 100 w resistor is connected to a 20 mA ideal dc current source by operating both switches at t = 0 s as shown. Which of the following graphs shown in the options approximates the voltage vs. across the current source over the next few seconds ?

4. The undesirable property of an electrical insulating material is
(A) high dielectric strength
(B) high relative permittivity
(C) high thermal conductivity
(D) high insulation resistivity

5.In the figure, the value of resistor R is (25 + I/2h) ohms, where I is the current in amperes. The current I is _____.

6.The following four vector fields are given in Cartesian co-ordinate system. The vector field which does not satisfy the property of magnetic flux density is ______.

7. Two identical coupled inductors are connected in series. The measured inductances
for the two possible series connections are 380 mH and 240 mH . Their mutual
inductance in mH is _____.

8. The switch SW shown in the circuit is kept at position ‘1’ for a long duration.
At t = 0+, the switch is moved to position ‘2’. Assuming Vo2 > Vo1 , the voltage
vc ^t h across the capacitor is_________.

9. A parallel plate capacitor consisting two dielectric materials is shown in the
figure. The middle dielectric slab is placed symmetrically with respect to the
plates.

If the potential difference between one of the plates and the nearest surface of dielectric interface is 2 Volts, then the ratio e1 : e2 is
(A) 1 : 4                                 (B) 2 : 3
(C) 3 : 2                                 (D) 4 : 1

10. The voltage across the capacitor, as shown in the figure, is expressed as

   The values of A1 and A2 respectively, are
(A) 2.0 and 1.98                       (B) 2.0 and 4.20
(C) 2.5 and 3.50                       (D) 5.0 and 6.40

 

Answers with detailed explanations will be available soon.