M3 - QUIZ NO. 3

An e.m.f. of 1.5 kV is induced in a

coil when a current of 4 A collapses uniformly to

zero in 8ms. Determine the inductance of the coil.

• 3 H

• 6H

• 8.25 H

• 9 H

The ability of a conductor to induce voltage in itself when the current changes is:

• CAPACITANCE

• INDUCTANCE

• RESISTANCE

• REACTANCE

FIND THE TOTAL INDUCTANCE:

• 0.5 H

• 2 H

• 4.5 H

• 9 H

Letter symbol for inductance is:

• I

• R

• C

• L

An e.m.f. of 2 kV is induced in a coil when

a current of 5A collapses uniformly to zero

in 10ms. Determine the inductance of the

coil.

• 4 H

• 10 H

• 2 mH

• 20 H

Formula in total inductance when inductor is in SERIES:

• LT = L1 +L2 +L3

• 1/LT = L1 + L2+ L3

• 1/LT = 1/L1 + 1/L2 + 1/L3

• LT = (L1 + L2) / (L1 X L2)

Unit for inductance is:

• Ohms

• Henry

• Hertz

• Farad

What is the self-induced voltage VL across a 4h inductance produced by a current change of 12 A per second?

• 48 V

• 3 V

• 24 V

• 56 V

Formula in total inductance when TWO inductor is in PARALLEL:

• LT = L1 +L2

• 1/LT = L1 + L2

• LT = (L1 x L2) / (L1 + L2)

• LT = (L1 + L2) / (L1 X L2)

The current in a 0.4-H inductor is changing at the rate of 200 A/s. What is

the voltage across it?

• 240 V

• 50 V

• 80 V

• 500 V