Exam 20: Inductance

What is a common piece of test equipment used to increase the ac voltage slowly while monitoring the operation of the equipment being repaired?

Counter emf or back emf is also known as a bucking voltage.

What is the mutual inductance for two 400-mH coils L₁ and L₂ that have a coefficient of coupling of 0.3?

Induced voltage is the result of flux cutting across an insulator.

Which of the following is a transformer core loss?

______________ coils are used in rf circuits because higher frequencies need less inductance for the required inductive effect.

With zero losses assumed for the transformer, the power in the secondary

Inductance is the ability of a conductor to produce induced voltage when the current varies.

What law or theorem states that the reaction v_L opposes its cause, which is the change in I?

When it is necessary to measure the value of an inductor, a ______________ analyzer should be used.

What is it called when a transformer is used to achieve maximum transfer of power from a generator to a load when the generator and load impedances are not the same?

When a transformer is used to change or transform a secondary load impedance to a new value as seen by the primary, the secondary impedance is called

______________ is the ability of a conductor to produce voltage when the current varies.

Which of the following is not a typical frequency rating for a power transformer?

______________-wound resistors have enough inductance to be evident at radio frequencies.

A steady dc current can induce a voltage in a coil.

What component uses mutual inductance to step up or step down an alternating voltage?

To minimize transformer core losses while maintaining high flux density, the core can be made of

With a(n) ______________ the secondary is not electrically isolated.

The most common trouble in coils is a(n) ______________ winding.