ELECTRIC CIRCUITS QUIZ

An alternating voltage = 140 sinθ is supplied to a device which offers a resistance of 20 Ω in forward direction of current in reverse direction. Calculate the form factor.

0.57.

0.318.

1.414.

1.11.

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Which part of magnetic path requires largest mmf?

Air gap.

Coil.

Core.

Inductance.

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In series RLC circuit to get Q>1, which of the following is required?

XL < R

XL = R

XL > R

All of these

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A balanced star connected load with impedance of 30j - 300 Ω is supplied from a 3 - phase, 4-wire, 173 V system, the voltages to neutral being 100j -900, 100j - 300 and 100j -1500 V. The current in neutral wire is

5 A.

50 A.

8.85 A.

zero.

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In steady state condition capacitor acts as a

open circuit

current source

short circuit

voltage source

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In RLC parallel circuit to get Q>1 which of the following is required?

All of these

XL=R

XL

XL>R

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An electric field line and an equipotential surface are

none of above.

always parallel.

always perpendicular.

inclined at any angle.

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Power dissipation in ideal inductor is

Maximum

Minimum

Zero

A finite value

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Electric field intensity ( E ) at any point in an electric field is equal to

( potential gradient )1/2.

potential gradient.

( potential gradient )1/3.

( potential gradient )2.

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For the circuit shown in the given figure the current I is given by

2 A.

4 A.

1 A.

3 A.

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