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Electric Circuits

Electric Circuits
The rms value of the voltage U(t)= 3 + 4cos(3t)

  4.123 V.
  5 V.
 {3 + 2(1.141)} V.
 7 V.

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Electric Circuits
To obtain a high value of capacitance, the permittivity of dielectric medium should be

 high
 zero
 low
 unity

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Electric Circuits
Phase voltages of a star connected alternator are ER = 240∠0o V, EY = 240∠-120o V and EB = 240∠ + 120o V. What is the phase sequence of the system?

 RYB.
 YBR.
 BYR.
 RBY.

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Electric Circuits
In a 3 - φ delta connection, two-wattmeter method is used to measure the power; if the two watt meters read 28.13 kW and 13.31 kW, the power factor of connection will be

 0.4.
 0.9.
 0.85.
 0.6.

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Electric Circuits
Find the Z parameters of the circuit shown in figure.

 Z11 = 2; Z12 = 1; Z21 = 1; Z22 = 2
 Z11 = 1; Z12 = 1; Z21 = 1; Z22 = 1
 Z11 = 3; Z12 = 3; Z21 = 3; Z22 = 3
 Z11 = 3; Z12 = 1; Z21 = 1; Z22 = 3

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Electric Circuits
In what connection we get neutral?

  Delta.
  Star.
  Mesh.
  Both A and B.

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MORE MCQ ON Electric Circuits

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