# Electric Circuits Mcqs

Q:

If the current flowing through an inductor of inductance 0.3Henry is 5.3t²+4.7t. Calculate the power.

 A) 0 B) 1 C) 16.854t³+22.41t²+6.62t D) 15.3t³+27.8t²+19

Explanation: P= L*i*(di/dt).

93
Q:

The insulating medium between the two plates of capacitor is known as __________

 A) Electrode B) Capacitive medium C) Conducting medium D) Dielectric

Explanation: The conducting surfaces are called electrodes and the insulating medium is called Dielectric.

98
Q:

An Inductor works as a ___________ circuit for DC supply.

 A) Open B) Short C) Polar D) Non-polar

Explanation: Induced voltage across an inductor is zero if the current flowing through it is constant. I.e. Inductor works as a short circuit for DC supply.

82
Q:

If the voltage across a capacitor is constant, then current passing through it is ________

 A) 1 B) 0 C) -1 D) Infinity

Explanation: I= c*(dv/dt).

235
Q:

If a capacitor of capacitance 9.2F has a voltage of 22.5V across it. Calculate the energy of the capacitor.

 A) 5062.5W B) 506.25W C) 50.625W D) 50625W

Explanation: E= ½ cv².

141
Q:

The units for inductance is _________ and capacitance is ___________

Explanation: The unit for inductance is ‘Henry’ and capacitance is ‘Faraday’.

64
Q:

The expression for energy of an inductor ____________

 A) ½ LI B) L/2I C) ½ L²I D) ½ LI²

Explanation: E=∫p dt
=∫ LI*(dI/dt).dt
= L∫I dI
= ½ LI².

82
Q:

The Inductor doesn’t allow sudden changes in ___________

 A) Voltage B) Current C) Resistance D) Inductance