Part66EASA Module3.11Inductor/Inductance(1of3)

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Part66EASA Module3.11Inductor/Inductance(1of3)

Faraday's Law; Action of inducing a voltage in a conductor moving in a magnetic field; Induction principles; Effects of the following on the magnitude of an induced voltage: Magnetic field strength, rate of change of flux, number of conductor turns; Mutual induction; The effect the rate of change of primary current and mutual inductance has on induced voltage; Factors affecting mutual inductance: number of turns in coil, physical size of coil, permeability of coil, position of coils with respect to each other; Lenz's Law and polarity determining rules; Back emf, self induction; Saturation point; Principle uses of inductors.

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Two inductive coils are placed in close proximity with each other at 90 degrees. The number of flux linkages is.

1 point

maximum negative.

maximum positive.

What is the mutual inductance if two coils of 10mH and 500mH have 90% of the flux transferred from one to the other?.

1 point

Option 1

459mH.

4.5mH.

63mH.

An inductor has 1,000 turns of wire and a cross sectional area of 0.001m2. If the core has a permeability of 0.000,001 and the coil is 0.1m. What is the value of the inductor?.

1 point

100microH.

100mH.

10mH.

Three inductors 10 mH, 5 mH and 20 mH are connected in parallel. What is the total inductance?.

1 point

Without knowing the coupling factor the total inductance cannot be found.

2.86mH.

35mH.

If the current reaches a maximum through an inductor of 2A in 15 seconds, what is the current after 3 seconds?.

1 point

1.26A.

0.63A.

1A.

The time constant of an inductor is.

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L/R.

L2 /R.

LR.

If the rate of change of current is halved, mutual inductance will.

1 point

stay the same.

halve.

double.

Why are the iron cores of most induction coils laminated?.

1 point

To reduce the effects of eddy currents.

To reduce the core reluctance.

To increase the core permeability.

When more than two inductors of different inductance are connected in parallel in a circuit, the total inductance is.

1 point

equal to the sum of the individual inductance.

equal to the inductance of the highest rated inductor.

less than the inductance of the lowest rated inductor.

The time constant in an inductive circuit is the time required for the current to reach.

1 point

70.7% of maximum value.

63.2% of maximum value.

63.7% of maximum value.

An AC inductive circuit has an inductance 0f 10 mH and a frequency input of 1000Hz. The opposition to current flow is approximately.

1 point

63 ohms.

63,000 ohms.

630 ohms.

Rotating coil B through 90° will.

1 point

increase the EMF induced into B.

increase the EMF induced into A.

decrease the EMF induced into B.

An inductor of resistance 5 kΩ and inductance 2mH is connected to a DC circuit. The time constant is.

1 point

400 ns.

10 seconds.

40 ms.

When switching off the supply, the back EMF in a collapsing field in an inductor.

1 point

can be multiple times bigger than forward EMF.

never exceeds forward EMF.

is equal to forward EMF.

An induced current in a coil.

1 point

opposes the EMF producing it.

does not affect the EMF producing it.

aids the EMF producing it.

1 Volt is produced when a current of 1 Amp per second is varied in a coil'. This is a definition of.

1 point

1 Ampere per metre.

1 Henry.

1 Coulomb per second.

Two inductor coils in very close proximity; if one of the coils is rotated 90 degrees slowly away from the other the mutual inductance.

1 point

decreases.

remains the same.

increases.

An inductor is said to be saturated when.

1 point

the current is at a maximum.

the current through it is zero.

it will no longer accept lines of flux.

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